U-Line CLRCO2075 User Manual 3
Service and Parts Manual
Supplement
For Model
CLRCO2075
U-Line Corporation U-Line Corporation
8900 North 55th Street PO Box 245040
Milwaukee, WI 53223 Milwaukee, WI 53224-9540
www.U-LineService.com
Phone (414) 354-0300 • FAX (414) 354-7905
Service & Parts Tech Lines Phone (800) 779-2547 • FAX (414) 354-5696
R
INTRODUCTION
2
Design ■Features ■Performance
INTRODUCTION
Three generations of pride and quality manufacturing and design improvements are built into all U-Line
products. The result: U-Line leads the market with innovative technology and superior craftsmanship.
This manual contains specific instructions for servicing the U-Line Échelon CLRCO2075.
Potential Problems With HFC-134A
This Service Manual has been written to cover product manufactured with HFC-134a. HFC-134A compressors will be received with a synthetic based ester oil charge. The hygroscopic (water attraction) property of
ester oil is many times greater than that of the mineral oils previously used with CFC-12. High system
moisture causes the formation of acids and alcohol which can damage the compressor. Systems should not
be left open for more than fifteen (15) minutes at any time as humidity from the air will enter system. To
assure system dehydration, the system should be pulled down to 100 microns and vacuum pump oil (mineral oil) must not be allowed to enter the system.
Cleanliness of the system will be extremely important. The presence of residues (chlorinated or greasy
residues, mineral oil, or impurities) can lead to capillary tube restrictions, oil return problems and compressor damage. Flux must not
be used on brazed joints.
INTRODUCTION
3
Design ■Features ■Performance
SERIAL NUMBER FORMAT
The serial number is divided into four segments. A typical serial number is 035497-03-0004.
The first two digits of the first segment, 03, represents the year the unit was made.
The next four digits of the first segment, 5497, represents the shop order number. Order number 5497 is
assigned for the Model CLRCO Black_00 units.
The second two digit segment, 03, represents the month the unit was made.
The third four digit segment, XXXX, is a factory internal control number used at U-Line Corporation.
035497-01-XXXX
Year
Shop
Order
Number
Month
Factory Internal
Control Number
INTRODUCTION
4
Design ■Features ■Performance
NOTES
INTRODUCTION
5
Design ■Features ■Performance
TABLE OF CONTENTS
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Serial Number Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Warranty Claims Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Leveling and Installation Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Gravity Drain Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Connecting a Drain Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Self-Cleaning Cycle Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Interior Storage Bin Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Thermistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
CLRCO2075 Control Board Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Refrigeration System Diagnosis Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Ice Thickness Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
CLRCO2075 Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Parts Listing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
CLRCO2075 Model Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
GENERAL INFORMATION
6
Design ■Features ■Performance
LIMITED WARRANTY
U-Line Corporation warrants each U-Line product to be free from defects in materials and workmanship
for a period of one year from the date of purchase; and warrants the sealed system (consisting of the compressor, the condenser, the evaporator, the hot gas bypass valve, the dryer and the connecting tubing) in
each U-Line product to be free from defects in materials and workmanship for a period of five years from
the date of purchase. During the initial one-year warranty period for all U-Line products U-Line shall: (1)
at U-Line’s option, repair any product or replace any part of a product that breaches this warranty; and (2)
for all Marine, RV and Domestic U-Line products sold and serviced in the United States (including Alaska
and Hawaii) and Canada, U-Line shall cover the labor costs incurred in connection with the replacement
of any defective part. During years two through five of the warranty period for the sealed system, U-Line
shall: (1) repair or replace any part of the sealed system that breaches this warranty; and (2) for all
Marine, RV and Domestic U-Line products sold and serviced in the United States (including Alaska and
Hawaii) and Canada, U-Line shall cover the labor costs incurred in connection with the replacement of
any defective part of the sealed system. All other charges, including transportation charges for replacements under this warranty and labor costs not specifically covered by this warranty, shall be borne by you.
This warranty is extended only to the original purchaser of the U-Line product. The Registration Card
included with the product should be promptly completed by you and mailed back to U-Line, or you can
register on-line at www.U-LineService.com.
The following are excluded from this limited warranty: installation charges; damages caused by disasters or
acts of God, such as fire, floods, wind and lightening; damages incurred or resulting from shipping,
improper installation, unauthorized modification, or misuse/abuse of the product; customer education
calls; food loss/spoilage; door and water level adjustments (except during the first 90 days from the date of
purchase); defrosting the product; adjusting the controls; door reversal; or cleaning the condenser.
If a product defect is discovered during the applicable warranty period, you must promptly notify either the
dealer from whom you purchased the product or U-Line at P.O. Box 23220, Milwaukee, Wisconsin 53223
or at 414-354-0300. In no event shall such notification be received later than 30 days after the expiration
of the applicable warranty period. U-Line may require that defective parts be returned, at your expense, to
U-Line’s factory in Milwaukee, Wisconsin, for inspection. Any action by you for breach of warranty must
be commenced within one year after the expiration of the applicable warranty period.
This limited warranty is in lieu of any other warranty, express or implied, including, but not limited to
any implied warranty of merchantability or fitness for a particular purpose; provided however, that to
the extent required by law, implied warranties are included but do not extend beyond the duration of the
express warranty first set forth above. U-Line’s sole liability and your exclusive remedy under this warranty is set forth in the initial paragraph above. U-Line shall have no liability whatsoever for any incidental, consequential or special damages arising from the sale, use or installation of the product or from any
other cause whatsoever, whether based on warranty (express or implied) or otherwise based on contract,
tort or any other theory of liability.
Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limitation
of incidental or consequential damages, so the above limitations may not apply to you. This warranty gives
you specific legal rights, and you may also have other rights which vary from state to state.
GENERAL INFORMATION
7
Design ■Features ■Performance
WARRANTY CLAIMS PROCEDURE
When submitting claims for warranty payment, please follow these guidelines.
You can use any form you would normally use to bill your customer (your own computer generated form,
Narda, USA, etc.).
The model and serial number MUST be on the claims. Claims will not be paid without a model and serial
number.
If you work on more than one unit per service call please submit a separate claim for each unit.
We track all defects through warranty claims, so please be specific on what the repair was. If it is a system
leak, please specify where the leak was.
Please be sure the claim is legible. If the claim form cannot be read, it will be returned, unpaid.
U-Line will not cover part or labor claims for the replacement of a complete ice maker assembly. All ice
maker parts are available as replacement parts and are stocked in our inventory. Remember: we do not
pay customer education calls. Door and water level adjustments are 90 day warranties only.
If you are changing out a unit please supply the model and serial number of both units (the unit being
replaced and the new unit) and the R.A. number.
Occasionally the customer does not return their warranty cards. In this case we use the date the unit was
shipped to our distributor for a beginning warranty date. This may cause the claim to be rejected for a
proof of purchase. If a copy of the Proof of Purchase/Install is not available at the site, the technician
should record the following information on the Labor Invoice:
• The name of the selling Dealer
• The date of purchase/installation
• The Order or Invoice number (if available)
• The type of document they saw i.e. Store Receipt, Closing Papers, Sign-Off of Building Permit,
Final Walk Through, etc.
If we have this information on the Labor Invoice, and we have the other information that is needed (cor-
rect Serial Number, type of repair, time spent on repairs, etc.), we will be able to process the invoice for
you in a timely manner.
At U-Line, parts and labor claims are paid separately. Included in labor are freon and recovery charges, all
other parts are handled by the parts department. We require that some parts be returned to us, so we may
return them to our vendor. It will be noted on your packing list if we require you to return the part. If a
part is to be returned please include a copy of the packing list and a copy of your claim. If the part was
purchased at one of our part distributors, you must handle the part warranty with that company. For labor
payment please send a readable copy of your claim to U-Line Corporation, P.O. Box 245040, Milwaukee
WI, 53224-9540, for warranty payment.
8
Design ■Features ■Performance
SAFETY PRECAUTIONS
Do not attempt to service or repair the unit until you have read the entire procedure. Safety items throughout this manual are labeled with Warning or Caution.
GENERAL INFORMATION
Warning means that failure to follow this safety statement may result in extensive product
damage, serious personal injury, or death.
!
WARNING
!
Caution means that failure to follow this safety statement may result in minor or moderate
personal injury, property or equipment damage.
!
DANGER: Risk of child entrapment. Before you throw away an old refrigerator or freezer:
Take off the doors, leave shelves in place so that children may not easily climb inside.
!
WARNING
!
• Never attempt to repair or perform maintenance on the unit until the electricity has been
disconnected.
• Altering, cutting of power cord, removal of power cord, removal of power plug, or direct
wiring can cause serious injury, fire and/or loss of property and/or life and will void the
warranty.
!
WARNING
!
• Do not lift unit by door handle.
• Never use an ice pick or other sharp instrument to help speed up defrosting. These
instruments can puncture the inner lining or damage the cooling unit.
• Failure to clean the condenser every three months can cause the unit to malfunction. This
could void the warranty.
• Never install the unit behind closed doors. Be sure front grille is free of obstruction.
Obstructing free air flow can cause the unit to malfunction, and may void the warranty.
!
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Design ■Features ■Performance
SERVICING
ELECTRICAL SPECIFICATIONS
Compressor Pins
To measure start winding resistance, measure across the C-S pins.
To measure run winding resistance, measure across the C-R pins. These pins should never measure any
resistance to ground. This would indicate a shorted compressor.
Specifications
FF7.5HBK Compressor Start Winding: 11.2 OHMS
FF7.5HBK Compressor Run Winding: 2.2 OHMS
Water Valve Coil Resistance: 280 OHMS
Bypass Coil Resistance: 380 OHMS
Pump Motor Winding Resistance: 71.5 OHMS
OVERLOAD PROTECTOR
RS
C
STARTING RELAY
RELAY COVER
CLRCO036
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Design ■Features ■Performance
LEVELING AND INSTALLATION REQUIREMENTS
It is extremely important that the unit is level. If it is not
level, the ice mold will not fill evenly. This can cause a
reduction in ice rate, uneven sized cubes or water spilling
into the storage area which will cause the ice in the bin to
melt prematurely. See Figure A.
Remember the floor surrounding a drain has a tendency to
slope towards the drain.
Leveling the Unit
1. Use a level to check the icemaker from front to back and from side to side. See Figure B. Use a level to
check the levelness of the icemaker from front to back and from side to side by placing a level on the
inside edge and along the door seal edge for built-in installation. See Figure B.
2. If the icemaker is not level, adjust the feet on the
corners of the unit as necessary. See Figure C.
3. Check after each adjustment and repeat the previous
steps as necessary until the unit is level.
Installation Requirements
• The unit may be built into a cabinet. There is no minimum clearance requirement for the top, left or
right sides of the unit.
• The location must allow enough clearance for water, drain, and electrical connections in the rear of
the unit.
• The location must not obstruct air flow to the front of the unit.
SERVICING
Figure A
CLRCO029
Figure B
DWR005
RAISE
LOWER
Figure C
UL307
FRONT SIDE
CLRCO006
11
Design ■Features ■Performance
GRAVITY DRAIN INSTALLATION
These guidelines must be followed when installing drain lines to prevent water from flowing back into the
ice maker storage bin and potentially flowing onto the floor causing water damage:
• Drain lines and fittings must have a 5/8" inside diameter.
• Drain lines must have a 1" drop per 48" of run (1/4" per foot) and must not create traps.
• The floor drain must be large enough to accommodate drainage from all drains.
• Insulate the bin drain line to prevent condensation.
Be sure to follow these guidelines to prevent water backing up into the storage bin.
Below are examples of gravity drain line installations. If a trap is in the drain line, the drain line must be
vented to assure proper draining. Without the vent, water will backup until enough pressure builds up to
force the water past the trap. Water may backup into the ice bin before the amount of pressure needed is
achieved. Water in the storage bin will cause the ice in the bin to melt prematurely.
The customer’s complaint will be slow ice production. The ice that has been made is melting
prematurely because water is backing up in the ice bin.
FROM ICE MAKER TO FLOOR DRAIN
1. Normal Drain. Proper Drainage
Pitched from ice maker
at least 1/4" per foot.
2. With Trap. Poor Drainage
Poor drainage.
Water backs up in drain line.
3. With Trap and Vent. Proper Drainage
Vent assures proper drainage.
Examples of Gravity Drain Installations
SERVICING
Plumbing installation must observe all state and local codes.
!
UL306
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Design ■Features ■Performance
CONNECTING A DRAIN PUMP
If a gravity drain connection is not available, U-Line strongly recommends the use of the U-Line P60 drain
pump. If your CLRCO2075 is not equipped with a factory installed pump, a P60 drain pump is available
through your Dealer, or direct from U-Line. If a pump other than the U-Line P60 drain pump is to be used,
it must meet the following specifications:
• It must be UL listed and have a UL listed, 120 VAC, 3-wire grounded power cord.
• Overall maximum outside dimensions of 8-3/4" wide x 5-3/4" deep x 7-3/4" high.
• Minimum flow rate of 15 gallons per hour at 10 feet of lift.
• It must have a sealed sump which does not allow water leakage in the case of a power outage, restricted
drain or pump failure.
• It must have a check valve in the discharge line to prevent waste water return to the pump.
• It must have an overflow protection control which will shut off power to the ice maker in the event of
a pump failure.
• Operating temperature range of 50°F to 110°F (10°C to 40°C).
If the CLRCO2075 is not equipped with a P60 drain pump or an equivalent drain pump, severe damage
and costly repair could result in the event of a power outage, restricted drain or pump failure.
Plumbing installation must observe all state and local codes. All water and drain connections
MUST BE made by a licensed/qualified plumbing contractor. Failure to follow recommendations
and instructions may result in damage and/or harm.
!
SERVICING
13
Design ■Features ■Performance
SERVICING
SELF-CLEANING CYCLE INSTRUCTIONS
To maintain operational efficiency, clean unit every six months (depending on water conditions more or
less frequent cleaning may be necessary). If the ice maker requires more frequent cleaning, consult a qualified plumber to test the water quality and recommend appropriate treatment. Use only U-Line Ice Machine
Cleaner (part number 41978).
1. Remove perishables from the refrigerator.
2. Set the cycle selector switch (located in the RH side of the grille) to OFF.
Allow the ice to melt off of the evaporator.
3. Remove all ice from the storage bin.
4. Remove inside front cover by gently pulling away from sidewall.
See Figure A.
5. Remove the overflow tube by lifting it up while using a slight back and
forth motion to loosen it from the drain hole. See Figure B. The water in
the reservoir will flow down the drain.
6. Replace the overflow tube after all the water has been drained from the
reservoir.
7. Move the cycle selector switch to the CLN position.
8. When water begins to flow over the evaporator, approximately three
minutes, add one packet of U-Line Ice Machine Cleaner to the reservoir.
9. Reinstall inside front cover.
10. When the self cleaning process stops, approximately 45 minutes, it may
be desirable to clean the storage bin. See INTERIOR STORAGE BIN
CLEANING.
11. Move the cycle selector switch to the ON position to resume ice
production.
12. Make sure the drain system is working properly and the drain hose is not
pinched or kinked. Pour one gallon of cool, fresh water into the ice bin.
The water should drain freely. If your CLRCO2075 is equipped with a
drain pump, the pump should drain the ice bin.
Use only U-Line Ice Machine Cleaner (part number 41978). It is a violation of Federal law
to use this solution in a manner inconsistent with its labeling. Use of any other cleaner can
ruin the finish of the evaporator and will void the warranty. Read and understand all labels
printed on the package before use. Ice machine cleaner is used to remove Lime scale and
other mineral deposits. Refer to the following steps for mineral deposit removal.
!
UL208
FRONT COVER
CLRCO012
OVERFLOW
Figure A
Figure B
Ice production after the first harvest may take longer after Self Cleaning Cycle since the
refrigeration portion will take precedence over producing ice to protect any perishables.
Once the refrigerator reaches a set temperature, ice making will resume to normal.
NOTE
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Design ■Features ■Performance
INTERIOR STORAGE BIN CLEANING
1. Disconnect power from the ice maker.
2. Remove any ice from the storage bin.
3. Wipe down the storage bin with a solution of non-abrasive mild soap or detergent and warm water.
Rinse with clean water. Sanitize the bin with a solution of one tablespoon of bleach and one gallon of
water. Rinse thoroughly with clean water.
4. Check that all drain connections are in place.
5. Reconnect power to the unit.
6. Make sure the drain system is working properly and the drain hose is not pinched or kinked. Pour one
gallon of cool, fresh water into the ice bin. The water should drain freely. If your CLRCO2075 is
equipped with a drain pump, the pump should drain the ice bin.
PRINCIPLES OF OPERATION
The U-Line Model CLRCO2075 combines the best of Échelon refrigeration and clear ice making capabilities into a single unit. A state-of-the-art microprocessor based controller simplifies operation and troubleshooting. There are four primary modes of operation:
1. Ice Making and Refrigeration
2. Ice Making and No Refrigeration
3. Refrigeration and No Ice Making
4. Ice Harvest (No Refrigeration Possible)
In addition, there are four sub modes of operation:
5. All Satisfied
6. Water Fill - No Refrigeration Required
7. Cleaning (No Refrigeration Possible)
8. Water Fill with Refrigeration Required
Review the following notes for general information before reading the schematics.
These are some additional general notes and exceptions:
1. The controller has a four-minute compressor minimum off-cycle regardless of thermistor status, for
compressor protection and cycling.
2. When making ice, the controller reads liquid line temperature four minutes into the ice making cycle
to determine the length of that ice making cycle and subsequent harvest length.
3. Once an ice making cycle is initiated, it will continue through to harvest regardless of the bin sensor.
4. There is a three-minute water fill cycle when the unit is turned on, or following a cleaning cycle. If
the refrigerator is warmer than set point (which it probably will be on initial installation) there will be
cooling on the refrigerator side as shown in Mode 8. If the refrigerator is below set point for any reason (recent operation, cold product, etc.), the refrigerator side will not run and the operation will be
as shown in Mode 6.
5. In order to maintain adequate refrigerator temperature, the unit will sometimes run in the refrigeration
only mode, as shown in Mode 3, even if the ice bin sensor is calling for ice. At the end of each ice
harvest, the controller checks the refrigerator sensor and if it is warmer than the higher of 42°F, or the
set point, it will go into refrigeration only mode. If it reaches 42°F and the set point is lower, it will
continue to refrigerate and start an ice making cycle. If it reaches a higher set point (say 45°F), it will
switch to ice making only mode. There is no fill cycle when ice making re-initiates in this case,
because the bin sensor has not been satisfied.
SERVICING
15
Design ■Features ■Performance
6. When the initial three-minute fill cycle is complete, the unit will enter ice making and refrigeration
mode (1) if the bin is empty or below the sensor. However, after the first slab of cubes is harvested,
the controller will follow the logic defined in #5 above and realizing the refrigerator is too warm, will
continue in refrigeration only mode (3) until the requirement is satisfied. Thus, upon start-up, the user
will see one slab of ice dropped in about 30 minutes, and then there will be no more ice until the
refrigerator reaches 42°F or a higher set point (this may be 2 to 3 hours depending on ambient conditions).
7. There will also be a water fill cycle after the ice bin has been “full” and then calls to make ice again.
This can occur when the refrigerator side is off as shown in Mode 6, or when it is on, which is shown
in Mode 8. If the refrigerator side is on, when the fill cycle initiates, it will remain on until the fill
cycle is completed, even if the refrigerator sensor is satisfied.
8. The controller has a four degree differential designed into it for the refrigerator sensor, such that when
it is set to 38°F, the refrigerator will cool until the refrigerator sensor reads 36°F and will not re-initiate
refrigerator cooling until the sensor reaches 40°F. So someone monitoring actual temperature (by
pressing WARMER momentarily) may see the refrigerator off when the temperature is a degree
warmer than set point, or refrigerator on when it is a degree below set point. Refer to Controller.
9. The controller is equipped with two error indicator LEDs on the display module:
• One LED dot flashes to indicate the P60 drain pump is, or has been, restricted. If the pump or line
clears itself, the unit will re-initiate operation, but the light will stay on until the unit is unplugged
or power to the unit is broken. In the event that the P60 pump shuts down the clear ice maker
operation the refrigerator side will continue to operate normally.
• The other LED dot indicates that one or more of the thermistors has failed or been out of limits.
If the bin sensor or liquid line sensor fails, the refrigerator will continue to operate, but ice making
will be shut down. If the refrigerator sensor fails, the refrigerator will be shut down, but the
ice maker will continue to operate. A sensor would normally fail by opening up (no continuity) or
shorting (no resistance). Refer to CONTROLLER for more information.
10. There is no high limit cut-out on this unit, however, if the liquid line sensor were to go out of range
(approximately 185°F), the thermistor error indicator light will flash, and the ice maker side of the unit
will shut down. The refrigerator will continue to run. When the temperature of the liquid falls back in
range, the unit will re-initiate operation, even though the error indicator light stays on. The unit will
not normally experience this condition up to 110°F, but conditions such as door openings, heavy
loading, restricted airflow, dirty condenser, or direct sun light may contribute to reaching this mode.
11. In both modes, unit on, but no need for ice or refrigeration, and Mode 7, clean cycle. The evaporator
bypass valve coil is energized, even though the REF VALVE relay is off. This is a double throw relay,
so either the refrigeration valve or refrigeration bypass valve coils are always energized, but they can
never both be energized at the same time.
12. In most applications, the refrigerator evaporator will remain frost-free by clearing itself between refrigeration cycles. However, because there is no thermostat bulb directly on the evaporator as in the
other U-Line refrigerators, the controller runs a thirty-minute refrigerator off-cycle, for every 12 hours
of clock time. This means the refrigerator side of the unit will not cool during that period even if the
refrigerator sensor is calling for cooling. The ice maker side can make ice if needed (same operation
as Mode 2, except refrigerator sensor may not be satisfied), or can also be shut down if the bin is full
(Mode 5).
SERVICING
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