Instrukcja obsługi Kolpak Polar Pak PX6-0812-CT-T3
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Kolpak/RDI
Refrigeration System
Installation & Operation
Manual
Welbilt
2915 Tennessee Avenue North
Parsons, TN 38363
Phone: 800 9916- -225
www.welbilt.com
550001058- 10
April 7 201
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Table of Contents
Safety Information ...................................................................................................................... 3
Receiving Inspection ................................................................................................................... 4
Locating and Mounting Condensing Units ...............................................................................4-6
Locating and Mounting Evaporator Coils .................................................................................6-7
Wiring 8 .........................................................................................................................................
Piping ..................................................................................................................................... 8-13
Leak Test ............................................................................................................................. 14-15
Evacuation ........................................................................................................................... 15-16
Refrigerant Charging ................................................................................................................. 16
Suction/Liquid Line Sizing Chart ...............................................................................................17
Operational Start- Up ........................................................................................................... 18-20
Compressor Superheat ............................................................................................................. 21
Evaporator Superheat ......................................................................................................... 22-23
Thermostat ........................................................................................................................... 24-28
Electric Defrost Timer ................................................................................................................ 29
Maintenance ............................................................................................................................ 30
Troubleshooting Charts ........................................................................................................ 31 33-
ArcticFox Local Area Dashboard & Alarms (LDA): .................................................................... 34
ArcticFox LDA Kit...................................................................................................................... 34
ArcticFox LDA Back Label ........................................................................................................35
ArcticFox LDA Side View .......................................................................................................... 35
ModBus Configuration .......................................................................................................... 36 38-
Installing The ArcticFox LDA: Option 1 ...................................................................................... 39
Installing The ArcticFox LDA: Option 2 ...................................................................................... 39
Installing The ArcticFox LDA: Option 3 ...................................................................................... 40
Using the ArcticFox Flash Drive For Data Logging The ArcticFox LDA ..................................... 40
Accessing The Local Dashboard .......................................................................................... 41 58-
Evaporator Troubleshooting ...................................................................................................... 59
Condensing Unit Troubleshooting ........................................................................................ 60 61-
Wiring Diagrams .................................................................................................................. 62 76-
Condensing Unit 208-230/1/60 .............................................................................................. 62
Condensing Unit 208-230/3/60 .............................................................................................. 63
Condensing Unit 460/3/60 ..................................................................................................... 64
Condensing Unit Medium Temp (MZ) Scroll 208-230/1/60 .................................................... 65
Condensing Unit Medium Temp (MZ) Scroll 208-230/3/60 .................................................... 66
Condensing Unit Low Temp (LZ) Scroll 208-230/1/60 ........................................................... 67
Refrigeration System Low Temp (LZ) Scroll 208-230/1/60 .................................................... 68
Condensing Unit Low Temp (LZ) Scroll 208-230/3/60 ........................................................... 69
Refrigeration System Low Temp (LZ) Scroll 208-230/3/60 .................................................... 70
Air Defrost Evaporator 115/1/ ................................................................................................ 71
Air Defrost Evaporator 208 230/60/1- ..................................................................................... 72
Air Defrost with 2 Evaporators 115/1/60 ............................................................................... 73
Air Defrost with 2 Evaporators 208-230/60/1 ......................................................................... 74
Electric Defrost Evaporator 208-230/1/60 .............................................................................. 75
Electric Defrost with 2 Evaporators 208-230/1/60 .................................................................. 76
System Start-Up Data Sheet ................................................................................................ 77 80-
Warranty Information................................................................................................................. 81
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General Safety Information
Read this manual carefully before beginning the installation and operation of the
refrigeration system. Special attention is required to all sections identified with the
following warning and caution notices provided in both English and French languages :
WARNING
Text in a Warning box alerts you to a potential personal injury situation. Read each
Warning statement before proceeding and work carefully.
AVERTISSEMENT
Le texte qui figure dans les encadrés d’avertissement vous alerte d’une
situation pouvant potentiellement causer des blessures. Lire chaque
déclaration d’avertissement avant de procéder et travailler prudemment.
CAUTION
Text in a Caution box alerts you to a situation in which you could damage the
refrigeration system. Read each Caution statement before proceeding and work
carefully.
MISE EN GARDE
Le texte qui figure dans les encadrés de mise en garde vous alerte d’une
situation dans laquelle le système de réfrigération pourrait subir des
dommages. Lire chaque déclaration de mise en garde avant de procéder et
travailler prudemment.
Disregarding these special notices may result in personal injury and/or damage to the
refrigeration system.
Safety Notices:
Installation and maintenance/servicing to be performed only by trained and are
qualified personnel familiar with commercial refrigeration systems.
Ensure that all field wiring conforms to the equipment requirements and all
applicable local and national codes.
Disconnect all power sources before servicing the refrigeration equipment.
Sheet metal and coil surfaces have sharp edges. Use appropriate protective
gloves to prevent injury.
Use appropriate eye protection during installation and servicing.
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Receiving Inspection
Check the shipment carefully and compare to the bill of lading. Account for all items
listed and inspect each container for damage. Carefully inspect for any concealed
damage. Report any shortages or damages to the carrier, note on the bill of lading, and
file a freight claim.
Damaged material cannot be returned to the manufacturer without prior approval. A
Return Material Authorization (RMA) must be obtained. Contact a sales representative
at 800- -826 7036.
Locating and Mounting Condensing Unit
General Guidelines:
Check the selected installation location to ensure that racks, braces, flooring,
foundations, etc. are adequate to support the condensing unit weight.
The installation location is clean, dry, and level.
Locate away from corrosive and noise sensitive atmospheres.
Use the condensing unit skid and base when moving the unit. Do not remove
unit from skid until the unit is moved to the mounting location.
Mount the condensing unit base to pads or structural rails using properly sized
bolts through the unit base. Center of condensing unit needs to be properly
supported.
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General Guidelines - Locating and Mounting Evaporator Coil (continued):
NOTE: Nylon bolts are supplied to prevent thermal transfer between the exterior
of the walk- - in and the interior of the walk in. Do not use metal bolts.
Lift the evaporator coil until the nylon bolts extend through the mounting
brackets.
Install washers and secure with nuts. Tighten until the coil is firm against the
ceiling. The evaporator coil must be level.
Additional information is available in the installation manual supplied with the
evaporator.
CAUTION
Failure to observe clearance and air flow requirements will result in poor system
performance and premature equipment failure!
MISE EN GARDE
Le non-respect des exigences de dégagement et de circulation d’air aura
pour résultat un rendement médiocre du système et une défaillance
prématurée de l’équipement!
Evaporator Coil Mounting Diagram
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Wiring
All electrical connections and routing must comply with local and national codes. Do not
modify the factory installed wiring without written factory approval. The field wiring must
enter through the knockouts provided. Refer to the nameplate on the condensing or
evaporator coil to determine the proper electrical power supply. Wire type should be of
copper conductor only and properly sized to handle the electrical load. The unit and coil
must be properly grounded. Condensing unit wiring diagrams are cated inside this lo
installation manual and attached inside the electrical box cover. Evaporator coil wiring
diagrams are located inside this installation manual and inside the evaporator cover.
WARNING
All wiring must comply with local and national codes. Wiring must be performed only by
a refrigeration technician or certified electrician Failure to follow these guidelines may .
result in injury!
AVERTISSEMENT
Tout le câblage doit être conforme aux codes locaux et nationaux. Le
câblage ne doit être effectué que par un technicien en réfrigération ou un
électricien agréé. Le non-respect de ces consignes peut entraîner des
blessures!
CAUTION
Check all wiring connections, including factory terminals, before operation. Connections
can become loose during shipment and installation.
MISE EN GARDE
Vérifier toutes les connexions de câblage, y compris les bornes installées en
usine, avant de faire fonctionner l’appareil. Les connexions peuvent devenir
lâches pendant l’expédition et l’installation.
Piping
General Requirements:
All refrigeration piping and components are to be installed in accordance with applicable
local and national codes and in conformance with industry refrigeration guidelines to
ensure proper operation of the refrigeration system. Only refrigeration grade copper
tubing should be used. Long radius elbows should be used. Short radius elbows have
points of excessive stress concentration and are subject to breaking at these points, do
not use short radius elbows. Suction lines must be insulated with a minimum ¾” thick
insulation tubing to reduce heat pick -up.
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Cleanliness:
Condensing units and evaporator coils are cleaned and dehydrated at the factory. The
condensing unit must remain closed and pressurized until the piping is complete and
final connections are ready to be made.
CAUTION
The maximum air exposure for dehydrated condensing units is 15 minutes. Systems
exposed longer than 15 minutes must have the compressor oil and drier filter replaced.
Leaving a system exposed to the atmosphere for more than 15 minutes can result in
premature system failure.
MISE EN GARDE
L’exposition maximale à l’air des groupes compresseurs-condenseurs
déshydratés est de 15 minutes. L’huile du compresseur et le filtre du
dessiccateur doivent être remplacés sur les systèmes qui ont été exposés à
l’air pendant plus de 15 minutes. L’exposition d’un système à l’atmosphère
pendant plus de 15 minutes peut avoir pour résultat une défaillance
prématurée du système.
Do not base mount vremove alve covers until work is ready to be performed. Ensure
that all refrigeration tubing is clean and dry prior to installation. Use only tubing cutters
when trimming tubing to the proper length. Do not use saws to cut tubing.
CAUTION
The use of saws to cut tubing can contaminate the system with copper chips causing
premature system failure.
MISE EN GARDE
L’utilisation de scies pour couper le tubage peut contaminer le système par
des copeaux de cuivre et causer une défaillance prématurée du système.
Brazing joints require a dry inert gas, typically nitrogen, be passed through the lines at a
low pressure to prevent scaling and oxidation. Use only silver solder brazing alloys.
Minimize the amount of flux to prevent internal contamination. Flux only the male
portion of the joint. Thoroughly clean fluxed joints after brazing.
CAUTION
Dry inert gas must be passed through the system while brazing to prevent scaling and
oxidation. Scaling and oxides can clog refrigeration components resulting in system
failure.
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MISE EN GARDE
Le gaz sec inerte doit passer par le système pendant le brasage afin de
prévenir l’entartrage et l’oxydation. Le tartre et les oxydes peuvent bloquer
les éléments de réfrigération et causer une défaillance du système.
Pipe Supports:
All tubing should be supported in a least two locations (near the end of each tubing run).
Long runs will require additional support. As a guide, support 3/8” to 7/8” pipe every five
feet, 1-1/8” to 1-3/8” every seven feet, and 1-5/8” to 2-1/8” every ten feet. Do not leave
a corner unsupported when changing directions. Place supports within 2 feet of each
direction change. Piping that is attached to a vibrating object (such as a compressor or
compressor base) must be supported in a manner that will not restrict the movement of
the vibrating object. Rigid mounting will fatigue the tubing causing refrigerant leaks.
Oil Traps:
To ensure proper oil return to the compre a P type oil trap should be installed at ssor, -
the base of each suction riser of four feet or more. The suction trap must be the same
size as the suction line. Additional traps are necessary for long vertical risers. Add a
trap for each length of pipe (approximately 20 feet) to insure proper oil return. Suction
lines must slope ¼” per 10 feet toward the compressor. Install a suction line trap at the
evaporator outlet if the suction line rises to a point higher than the connection on the
evaporator.
C AUTION
Failure to properly install oil traps can prevent sufficient oil return to the compressor
resulting in premature compressor failure.
MISE EN GARDE
L’installation incorrecte des siphons d’huile peut empêcher un retour d’huile
suffisant au compresseur, entraînant une défaillance prématurée du
compresseur.
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Pressure Regulating-Relief Valves:
WARNING
Do not defeat, cap, add piping to the outlet of the valve, or, attempt to
change the relief setting.
AVERTISSEMENT
Ne pas annuler, mettre un capuchon, ajouter de la tuyauterie à la prise de la
valve ou tenter de modifier le réglage de décharge.
Drain Lines:
Evaporator coil drain lines should be pitched a minimum of per foot to allow proper 1/2”
drainage and exit the walk-in as quickly as possible. Insulate and seal the drain line
where it passes through the wall. Copper drain line is required Freezer compartment .
drain lines must have heat tape wrapped around the copper drain line and must have
¾” thick insulation tubing Do not locate. drain -line P traps within the freezer space. Do
not reduce the drain line size. Locate a drain line P-trap outside of the cooler space.
Any outdoor P-traps exposed to low ambient temperatures should be wrapped with a
drain line heater (provide 20 watts of heat per foot of drain line at 0°F, 30 watts per foot
at -20°F. Freezer/cooler combo boxes can have one common drain line. However,
there must be a P-trap located between the freezer evaporator and the cooler
evaporator located inside the cooler compartment. The cooler compartment P-trap
should be located between the cooler evaporator and the external drain location.
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P - re Charged lines and Quick Connects:
Route the suction and liquid line sets between the condensing unit and evaporator coil
following the piping guidelines identified in this manual. Remove the dust caps from the
quick connect fittings and verify that the o rings are intact. Wipe the coupli- ng seals and
threaded surfaces with a clean cloth to prevent contamination. Lubricate the threads
and o-rings with Polyol Ester oil. Thread the coupling halves together by hand to
ensure proper thread mating. Tighten with a wrench until the coupling bodies “bottom”
or until there is definite resistance. Tighten an additional ¼ turn to ensure proper brass-
to-brass seating. Once the system is opened and pressurized, check each fitting for
refrigerant leaks. If a leak is detected, tighten until the leak stops.
WARNING
Do not loosen and disconnect the quick connect fittings before reclaiming the refrigerant
and depressurizing the system. Disconnecting a pressurized system can result in
injury!
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Pre-Charged lines and Quick Connects (continued):
AVERTISSEMENT
Ne pas desserrer et désaccoupler les raccords rapides avant de récupérer
le réfrigérant et de dépressuriser le système. La déconnexion d’un système
sous pression peut entraîner des blessures!
CAUTION
Quick connects are for one time use only. Once disconnected, the coupling cannot be
re-used. Refrigerant leaks will occur if the couplings -are re used resulting in poor
system performance.
MISE EN GARDE
Les raccords rapides ne sont prévus que pour un seul usage. Une fois
désaccouplés, ils ne peuvent plus être utilisés de nouveau. Des pertes de
réfrigérant se produiront si les raccords sont réutilisés, ayant pour résultat
un rendement médiocre du système.
Excess line set length should never be allowed to coil in the vertical position. Excess
line length should be laid flat on its side.
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Leak Testing
After all connections are complete the refrigeration system must be tested for leaks.
Failure to perform a leak test can result in unsatisfactory system performance,
additional servicing and service costs, and possible system failure. Leak test should be
performed using an electronic leak detector. All joints and components, both factory
and field installed, should be thoroughly inspected for leaks. The system installation
must be leak free!
Leak Testing “PR” model systems:
Open both the liquid and suction service valves.
Ensure the solenoid valve is energized and open.
Add 50 psi refrigerant, then pressurize with dry nitrogen to the low side test
pressure identified on the unit rating label.
Allow thirty minutes for refrigerant to reach all parts of the system.
Check all joints and components with an electronic leak detector.
Leak Testing “PC” model systems:
Leave the service valves closed, the condensing unit is charged with refrigerant.
Ensure the solenoid valve is energized and open.
Add 50 psi refrigerant, then pressurize with dry nitrogen to the low side test
pressure identified on the unit rating label.
Allow thirty minutes for refrigerant to reach all parts of the system.
Check all joints and components with an electronic leak detector.
Leak Testing “PCL” model systems:
Open both the liquid and suction service valves.
Ensure the solenoid valve is energized and open.
Allow thirty minutes for refrigerant to reach all parts of the system.
Check all joints and components with an electronic leak detector.
If a leak is detected, relieve the pressure and/or reclaim the refrigerant and repair the
leak. If additional brazing is required, pass a dry inert gas (nitrogen) through the system
to prevent contamination. Reference page 1 of this manual for leaks located at quick 2
connects couplings. Retest the system as outlined above until no leaks are detected.
NOTE: refrigerant R448 is a blend and when leaks occur, it is unknown which
refrigerant blend or how much of it has escaped. If R448 refrigerant is simply
“topped off”, the new blend mixture may affect proper performance of the
system.
CAUTION
If a braze joint is detected leaking, dry inert gas must be passed through the system
while repairing the joint to prevent scaling and oxidation. Scaling and oxides can clog
refrigeration components resulting in system failure.
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MISE EN GARDE
Si une fuite d’un joint de brasage a été détectée, le gaz inerte doit passer
par le système lors de la réparation du joint afin de prévenir l’entartrage et
l’oxydation du système. Le tartre et les oxydes peuvent bloquer les éléments
de réfrigération et causer une défaillance du système.
CAUTION
Always use the system specified refrigerant when pressuring to perform a leak test.
MISE EN GARDE
Utiliser toujours le réfrigérant du système précisé lors de la mise sous
pression dans le but de réaliser un essai de fuite.
System Evacuation
Evacuation of the refrigeration system is necessary to remove all air and moisture from
the system. A reliable rotary vacuum pump with an accurate deep vacuum gauge is
recommended. Do not use the system compressor as a vacuum pump and do not
operate the compressor while the system is under vacuum.
Evacuation of “PR” model systems:
Open both the liquid and suction service valves.
Ensure the solenoid valve is energized and open.
Connect vacuum pump to the liquid and suction service located on the valves
condensing unit.
Evacuate the system to 250 microns and maintain for a minimum of 4 hours.
Perform a vacuum decay test for a minimum of ten minutes to ensure the system
is leak free and dry.
Evacuation of “PC” model systems:
Leave the service valves closed, the condensing unit has been evacuated and is
charged with refrigerant.
Ensure the solenoid valve is energized and open.
Connect vacuum pump to the liquid and suction service valves. located on the
condensing unit.
Evacuate the system to 250 microns and maintain for a minimum of 4 hours.
Perform a vacuum decay test for a minimum of ten minutes to ensure the system
is leak free and dry.
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Evacuation of “PCL” model systems:
“PCL” systems do not require evacuation.
CAUTION
Do not use the system compressor to evacuate the system. Do not start the
compressor while the system is under vacuum. This may damage to the compressor
and cause premature system failure.
MISE EN GARDE
Ne pas utiliser le compresseur du système pour vidanger celui-ci Ne pas
démarrer le compresseur pendant que le système est sous vide. Cela peut
endommager le compresseur et causer une défaillance prématurée du
système.
Refrigerant Charging
The refrigerant charge should be added to the system through the liquid line
service valve located on the condensing unit. Do not charge liquid refrigerant
into the suction service valve! The initial charge should be determined by weight
and sight glass indication. Start the system. If the condensing temperature is
105° F or greater, charge the system until the sight glass clears. If the
condensing unit temperature is below 105° F, reduce the condenser face surface
area to raise the discharge pressures above 105° F and to charge to a clear sight
glass. Return to a full condenser face area when charging is complete.
NOTE: PC & PCL refrigerant charge amounts are based on average ambient
operating temperatures across the United States. Any refrigerant amount added
or removed based on ambient operating temperatures is considered part of
normal maintenance and is not covered under warranty.
CAUTION
Do not charge liquid refrigerant into the suction service located on the condensing valve
unit. Do not overcharge the system. These conditions can permit liquid refrigerant to
enter the compressor and cause damage to internal components resulting in premature
system failure.
MISE EN GARDE
Ne pas charger le réfrigérant liquide dans le robinet d’aspiration de service.
Ne pas surcharger le système. Ces conditions peuvent permettre au
réfrigérant d’entrer dans le compresseur et de causer des dommages aux
composants internes, entraînant une défaillance prématurée du système.
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Operational Start-Up
The first 2 – 4 hours of operation after initial start up is a critical time. Do not just start -
the system and leave. Pressure values, compressor and evaporator superheat, and
inspecting for excessive vibrations and loose connections are some of checks that must
be performed prior to leaving the system.
Pre-Start Checks:
Verify that all service valves are fully open.
Ensure that all refrigerant and electrical connections are tight.
Verify that the wiring and piping is properly routed and secured.
The compressor mounting bolts are properly adjusted (see compressor mounts
on page 18 ).
All fan motors and mounting brackets are tight.
The condensing unit base and evaporator coil are properly secured.
Compressor Mounts:
Hermetic Compressors ic compressor springs are mounted internally; check – hermet
the compressor mounting bolts to ensure the nuts have not become loose during
shipment.
Semi-Hermetic Compressors – most semi-hermetic compressors have external spring
mounts and are factory assembled. The following actions are required once the
condensing unit is installed and before system start- up:
Loosen the upper mounting nuts.
Remove the spring steel clips from the mounting springs.
Retighten the upper mounting nuts until the compressor can float on the springs
approximately 1/16” between the mounting nut and rubber grommet.
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Compressor Mounts (continued):
CAUTION
Failure to ensure the compressor mounts are properly tightened can result in fatigue to
the system piping causing leaks and poor system performance.
MISE EN GARDE
Des fixations de montage du compresseur qui ne sont pas serrées
adéquatement peuvent entraîner une fatigue de la tuyauterie du système se
traduisant par des fuites et un rendement médiocre.
Start-Up Procedure:
CAUTION
Do not start the system while in a vacuum. Do not leave the system unattended until
normal operating conditions are achieved.
MISE EN GARDE
Ne pas démarrer le système lorsqu’il est sous vide. Ne pas laisser le système
sans surveillance jusqu’à ce que des conditions normales de fonctionnement
aient été atteintes.
Compressor
Mounting Foot
Mounting Nut
(Upper)
Mounting
Stud
Rubber
Spacer
Mounting
Spring
Mounting
Base
Locking
Device
Mounting Nut
( ) Lower
Properly Adjusted Compressor Mount
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Start-Up Procedure (continued):
Operate the system for a minimum of two hours and perform checks of the following:
Check the compressor discharge and suction pressures to ensure they are in the
normal operating range.
Check the liquid line sight glass for proper refrigerant charge (based off of 105ºF
condenser coil).
Monitor the compressor oil level (semi hermetic compressors), add oil as necessary to -
keep the level at ¾ sight glass when idle and ½ sight glass when running.
Check the voltage and amperage at the compressor terminals. Voltage must be
within +10% or 5% of the rating indicted on the condensing unit name plate. On -
three phase compressors, verify there is a balanced load.
Check all fans on the evaporator coil and condensing unit to be sure they are
operational and turning in the correct direction.
Check the piping and electrical connections for vibration. Add supports and
strapping if needed.
Check the crankcase heater operation (if equipped).
Set the defrost control time and verify the defrost initiation settings. See pages
28 30- for additional details.
Set temperature control to desired temperature range.
Check the compressor and evaporator superheat (reference pages 21 23- ).
After all system checks have been checked, properly adjusted, and verified, replace all
Schrader caps, service valve caps, electrical box covers, housings, etc. File a copy of
this manual for future reference.
CAUTION
Failure to check and properly adjust compressor superheat can result in premature
system failure.
MISE EN GARDE
La vérification et le réglage inadéquats de la surchauffe du compresseur peut
entraîner une défaillance prématurée du système.
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Compressor Superheat:
Compressor superheat is critical value that must be checked. Check the a compressor
superheat as follows:
1. Determine the suction pressure at the suction service valve of the compressor.
2. Determine the saturation temperature at the observed suction pressure using
refrigeration pressure temperature tables.
3. Measure the suction line temperature 6 -10 inches away from the compressor.
4. Subtract the saturation temperature (step 2) from the measured temperature
(step 3). The difference is the superheat of suction gas.
A low suction superheat can cause liquid to return to the compressor. This will cause
dilution of the oil and eventual failure of the bearings, rings and valves. A high suction
superheat will cause excessive discharge temperatures, which cause a breakdown of
the oil. This causes piston ring wear, and piston and cylinder wall damage. System
capacity decreases as the suction superheat increases. For maximum system capacity,
keep the suction superheat as low as practical. Copeland requires a minimum
compressor superheat of 20° however, to improve compressor life, F; 25°F to 40°F is
preferred. Adjust the expansion valve at the evaporator when adjustments to the
suction superheat are necessary. Refer to “Evaporator Superheat” on the next 2 pages
for more information.
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Evaporator Superheat:
Check the evaporator superheat once the has reached the desired temperature. walk-in
Generally, systems with a design temperature drop of 10°F should have an evaporator
superheat value of 6°-10°F on freezers and 8°-12°F on coolers for maximum efficiency.
To determine the evaporator superheat:
1. Measure the suction pressure at the evaporator outlet.
2. Convert the pressure to saturation temperature referencing a temperature-pressure
chart.
3. Measure the temperature of the suction line at the expansion valve bulb. Ensure
the bulb is mounted at the correct location on the suction tube.
4. Subtract the saturation temperature reading (step 2) from the measured temperature
(step 3). The difference is the evaporator superheat.
CAUTION
Minimum compressor superheat of 20°F may override these recommendations on
systems with short line runs.
MISE EN GARDE
Une surchauffe minimale de 20 °F peut écraser ces recommandations sur les
systèmes ayant de courtes conduites.
CAUTION
The condensing unit must have the discharge pressure above the equivalent 105°F
condensing pressure (reference refrigerant charging on page 16).
Temperature minus
pressure converted
to temperature
equals superheat
T emperature
P ressure
Determining Evaporator Superheat
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Evaporator Superheat (continued):
MISE EN GARDE
La pression de décharge du groupe compresseur-condenseur doit être
supérieure à la pression de condensation équivalente de 105 °F (40,5 °C)
(faire référence au chargement du réfrigérant à la page 16).
CAUTION
Correct location and full contact of the expansion valve bulb is extremely important for
proper system performance.
MISE EN GARDE
L’emplacement correct et le plein contact du bulbe du détendeur sont
extrêmement importants pour assurer un bon rendement du système.
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Thermostats
P/N 550005663 P/N 550005664
Air Defrost Evaporators Electric Defrost Evaporators
P/N 550005663 is used on all Air Defrost model evaporators and features a built in Air
Defrost time clock. default defrost settings are every 6 hours for 30 minutes. See The
pages 27-28 for default and custom defrost setting instructions.
P/N 550005664 is used on all Electric defrost model evaporators. See page 29 for
Electric Defroster Timer setting instructions.
NOTE: The 550005664 display will be blank during the electric defrost cycle.
www.welbilt.com 800-225-9916 25
Thermostats (continued)
• Access Setpoint mode by pressing and holding the button until
ts (Temperature setpoint) displays on the screen
• Use the up and down arrows to scroll through the available setpoints
• Press to view the current setting
• Use the up and down arrows to change the setpoint
• Press and hold the button to confirm each setpoint change
• Press the button to escape
www.welbilt.com 800-225-9916 26
Thermostats (continued)
Setpoints
tS = Temperature setpoint
diF = Differential
CSH = Maximum compressor starts/stops
dPd = Defrost per day
tod = time of day ( only used when custom defrost is selected)
dFt = Defrost time
HAO = High Alarm Offset
LAO = Low Alarm Offset
tAd =Temperature Alarm Delay
Adr = Mod Bus Address
Unt = Ynits for temperature display (FAH or CEL)
www.welbilt.com 800-225-9916 27
Thermostats (continued)
Custom tod (Time of Day) Defrost Setpoints
Setpoint Description Minimum Default Maximum
tod Time of Day 0.0 12.0 23.5
d1 Start time of day #1 dis (disabled) 23,dis (disabled)0.0
d2 Start time of day #2 0.0 dis 23,dis
d3 Start time of day #3 0.0 dis 23,dis
d4 Start time of day #4 0.0 dis 23,dis
d5 Start time of day #5 0.0 dis 23,dis
d6 Start time of day #6 0.0 dis 23,dis
d7 Start time of day #7 0.0 dis 23,dis
d8 Start time of day #8 0.0 dis 23,dis
d9 Start time of day #9 0.0 dis 23,dis
d10 Start time of day #10 0.0 dis 23,dis
d11 Start time of day #11 0.0 dis 23,dis
d12 Start time of day #12 0.0 dis 23,dis
Note: The time of day defrost setting use military time. The first 2 digits are the hour and the 1
digit after the decimal is the minutes.
www.welbilt.com 800-225-9916 28
Thermostats (continued)
Custom Defrost Setup
www.welbilt.com 800-225-9916 29
Electric Defrost : Timer
Electric Defrost Time Clock Instructions:
Instructions for setting the timer is located on the inside cover of the time clock. The defrost
timer clock must be set to the correct time at initial start up and after any power interruptions. -
S et the clock by rotating the clock face until the correct time is at the arrow on the face of the
timer. The switch is programmed by pushing the captive trippers to the inner ring for the entire
period the load is to be turned “ON”. When a tripper is pushed to the outside, the switch is in the
“DEFROST” position. Each defrost tripper represents 15 minutes of defrost time. The timer is
factory set for four defrost cycles daily: 4:00AM, 10:00AM, 4:00PM, and 10:00PM. Each defrost
cycle is programmed for 45 minutes duration. The defrost times may be changed to initiate at
periods of low activity rippers pushed out will close contacts to terminals 1 & 3(t ).
Note: If the defrost termination thermostat fails to close, the fail safe setting on the timer
will terminate the defrost cycle. The timer starts the defrost cycle automatically at the
predetermined times. A setting of two to four defrost cycles per day is typical. For
heavier frost loads, additional cycles may be required.
When the defrost cycle begins:
1. Switch 2 to 4 opens in the time clock, breaking the circuit to the room thermostat, liquid line
solenoid, and evaporator fan motors. This allows the compressor to pump down and shut
off. Simultaneously, switch 1 to 3 closes in the timer, energizing the defrost heaters.
2. The heaters increase the coil temperatures above 32°F, melting the frost off the coil.
3. When the coil warms to approximately 55°F, the defrost termination thermostat closes and
energizes the switching solenoid in the timer. At this time, switch 1 to 3 in the timer opens,
terminating the defrost heaters. Simultaneously, switch 2 to 4 closes in the time clock,
energizing the temperature control circuit.
4. Suction pressure rises, the low pressure control closes, and the compressor starts.
5. The fan relay closes when the coil temperature reaches approximately 30°F. This energizes
the fan motors.
6. The system operates in the refrigeration cycle until another defrost cycle is initiated by the
timer.
www.welbilt.com 800-225-9916 30
Maintenance
Maintenance Chart
Area
Task
Frequency
Evaporator
Check for proper defrosting
Monthly
Clean the coil and drain pan
Every 6 months
Check for proper drainage
Condenser
Inspect /clean the coil if the air supply is near polluting sources
(such as cooking appliances)
Monthly
Clean the coil surface
Every 3 months
General
Check/tighten all electrical connections
Every 6 months
Check all wiring and insulators
Check contactor for proper operation and contact point deterioration
Check all fan motors
Tighten fan set screws, and motor mount nuts and bolts
For semi hermetics, check the oil level in the system-
Check the operation of the control system
Make certain all safety controls are operating properly
Check operation of the drain line heater and examine for cuts and
abrasions
Check/tighten all mechanical/flare connections
CAUTION
Failure to keep the condenser coil clean will result in reduced airflow through the
condenser, resulting in poor system performance and premature compressor failure.
MISE EN GARDE
Le manquement à maintenir la propreté du serpentin réfrigérant aura pour
résultat une réduction de la circulation d’air dans le condenseur, entraînant
un rendement médiocre du système et une défaillance prématurée du
compresseur.
Polyol Ester (POE) Lubricants:
Polyol Ester (POE) lubricants quickly absorb moisture from the ambient surroundings.
POE lubricants absorb moisture more rapidly and in greater quantity than conventional
mineral oils. Because moisture levels greater than 100 PPM will result in system
corrosion and component failure, it is essential that system exposure to ambient
conditions be kept to a minimum.
If a system is left open to the atmosphere for more than 15 minutes, the liquid line drier
and compressor oil must be replaced. Drain at least 95% of the oil from the compressor
suction port. Measure the amount of removed oil, and replace it with exactly the same
amount of new POE oil. Mobil EAL™ ARCTIC 22 CC is the preferred Polyol Ester
www.welbilt.com 800-225-9916 31
Polyol Ester (POE) Lubricants (continued):
lubricant because of its particular additives. ICI Emkarate RL 32S is an acceptable
alternative when the Mobil is not available. These POE lubricants must be used with
HFC refrigerants. Lubricants are packaged in specially designed, sealed containers.
Once opened, use the lubricant immediately. Properly dispose of any unused lubricant.
Troubleshooting Charts
Evaporator Troubleshooting Chart:
Problem
Possible Cause
Corrective Action
Fan(s) will not operate.
Main switch open
Close switch
Blown fuse(s)
Replace fuse(s). Check for short
circuits or overload conditions.
Defective motor
Replace motor.
Defective timer or defrost
thermostat
Replace defective component.
Unit in defrost cycle
Wait for completion of cycle.
Walk- in temperature too high.
Thermostat set too high
Adjust thermostat.
Superheat too high
Adjust thermal expansion valve.
System low on refrigerant
Locate and repair leak, recover,
evacuate and recharge.
Coil iced up Manually defrost coil. Check
defrost controls.
Ice accumulating on ceiling
around evaporator and/or on fan
guards, venturi, or blades.
Defrost duration is too long
Adjust defrost termination
thermostat (if adjustable).
Fan delay not delaying fans after
defrost period
Replace defective defrost
thermostat.
Defective defrost thermostat or
timer
Replace defective component.
Too many defrost cycles per day Reduce number of defrost cycles
per day.
Frost on coil after defrost cycle.
Coil temperature not getting
above freezing point during
defrost
Check heater operation
Not enough defrost cycles per
day
Adjust timer for more defrost
cycles per day
Defrost cycle too short Adjust timer for longer cycle,
check defrost thermostat
mounting
Defective timer or defrost
thermostat
Replace defective component.
Ice accumulating in drain pan.
Defective heater
Replace heater.
Unit not pitched properly
Check and adjust.
Drain line plugged
Clean drain line.
Defective drain line heater
Replace heater.
Defective timer or thermostat
Replace defective component.
Specyfikacje produktu
| Marka: | Kolpak |
| Kategoria: | lodówka |
| Model: | Polar Pak PX6-0812-CT-T3 |
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