TRUE Temperature Controls SERVICE MANUAL

TRUE

TECHNICAL SERVICE MANUAL - ALL MODELS

TEMPERATURE

CONTROLS/

THERMOMETER/TIMERS

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NOTES

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TECHNICAL SERVICE MANUAL - ALL MODELS

TEMPERATURE

CONTROLS/

THERMOMETER/TIMERS

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Temperature Control Repairs

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SUBJECT TO CHANGE

TECHNICAL SERVICE MANUAL - ALL MODELS

HOW TO DIAGNOSE

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STEP 1 - Control must operate within its pre-calibrated range of temperatures.

STEP 2 - Cut-in is the ON tem- perature.

STEP 3 - Cut-out is the OFF tem- perature.

NOTE:

All temps are at mid-point setting #5. All temps advised have a +/- 2 degree variance.

Confirmed Calibration

TRUE P/N MFG P/N APPLICATION CUT-IN CUT OUT

800303 9531N376 35 15

800304 9530N1490 -9 -15

800306 9531N251 40 19

800312 9530N1284 -8 -15

800313 9531N335 37 16

800320 9530N1185 33 27

800325 9530N1318 RED WINE, CHOCOLATE 62 55

800335 9530N1376 38 20

800340 9530N1155 26 11

800345 077B1264 -3 -16

800357 9530266 -3 -8

800358 077B1214 -9 -14

800363 9530C311 -3 -13

800366 077B6806 37 17

800368 077B6857 42 23

800369 077B1212 -3 -12

800370 077B1216 -14 -25

800371 077B6863 42 24

800382 077B6856 37 18

800383 077B1227 0 -6

800384 077B1229 25 19

800385 077B1228 WHITE WINE 43 34

800386 077B6871 41 20

800387 077B6887 FLOWER COOLER 39 21

800390 9530N1329 SUPER NOVA 13 8

800393 077B6827 42 21

800395 931N370 HIGH ALTITUDE 40 23

800399 9530C304 0 -5

822212 CAP-075-174R HEATED

822213 077B6894 37 22

822214 077B1309 31 17

822223 077B1331 26 9

831931 077B1277 -2 -9

831932 3ART56VAA4 40 18

831987 077B0995 RED WINE, CHOCOLATE 57 50

908854 077B6926 36 10

908975 077B1352 -16 -32

911427 077B1354 38 26

913382 077B1367 -11 -23

917838 077B1369 0 -14

930794 091X9775 42 25

933190 091X9796 42 19

958745 3ART55VAA4 39 18

958747 095X0028 37

958857 3ART5VAA198 8 -6

959268 3ART55VAA3 40 26

960640 3ART55VAA5 43 20

962728 3ART55VAA6 42 20

963056 3ART55VAA2 39 16

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HOW TO CHECK THE CUT-IN AND CUT-OUT OPERATION OF A TEMPERATURE CONTROL

OPERATION INSTRUCTIONS

Tools Required

• 1/4" Nut Driver of Socket

• Digital Thermometer of Equivalent

• Multi-Meter (Optional)

STEP 1 - Disconnect the power to the cabinet.

STEP 2 - Locate the temperature control and note its setting. The temperature control

should be set at mid-range, about 5.

NOTE: If the control was set to high (colder) this could be why the product is freezing. Reset the control and check the cabinet operation in 24-48 hours. You may have to use your multi-meter to check and see if the control has power and is closing.

STEP 3 - Remove the four 1/4" hex head screws that secure the fan guard in place. This will expose the evaporator motor fan blade. Keep in mind that there might be more than one evaporator fan motor.

STEP 4 - Remove the nut that holds the fan blade in place. See image 2.

STEP 5 - Remove the fan blade. If there are additional fan blades remove all. See image 3

STEP 6 - Insert your digital thermometer into the evaporator coil as close to the tem-

perature control copper tube as possible. This would be to the right side of the opening. See image 4.

STEP 7 - Plug the unit in. The compressor should come on. The evaporator temperature will come down very fast allowing you to see approximately what temperature the control opened up and the compressor shut off. This is your cut-out point. Check this against the spec’s for the control to determine if the operation is where is should be.

NOTE: This process should not take more than 10 minutes. If it does, there might be a problem with the refrigeration system.

STEP 8 - Open up the cabinet door (s) to allow the warm air to come into the cabinet. This will warm up your evaporator coil and close the temperature control, turning the compressor on. This is your cut-in point. Check this against the spec’s for the control to determine if the operation is where it should be.

THE TEMPERATURES THAT YOU READ COULD BE + 2˚ F.

STEP 9 - Based on your ndings you may have to replace or adjust the control Repeat

Steps 7 and 8 several times to verify the operation after you have made the necessary

repairs.

STEP 10 - Remove the power cord. Starting with Step 5 and working backwards place the fan blade and fan guard in place and put the unit back together.

STEP 11 - Plug the unit back in.

Most of the cooler temperature controls are

coil sensing constant cut-in controls.

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REPLACING TEMPERATURE CONTROLS IN GDM-7, GDM-10, AND GDM-12 MODELS (OLD MODELS)

INSTALLATION INSTRUCTIONS

STEP 1 - Unplug Cooler and turn temperature control to “off ”

(“0”) position.

STEP 2 - Pull off the black control knob from the control.

STEP 3 - Remove the mounting plate from the evaporator housing.

STEP 4 - Remove the temperature control from the plate and dis-

connect the 2 wires.

STEP 5 - Remove the lamp from the front of the cooler and remove the front panel.

STEP 6 - Reach in to the side of the evaporator coil and remove the permagum from around the control bulb. Then remove the old thermostat control bulb from the sleeve completely.

STEP 7 - Insert the new thermostat control bulb into the new copper sleeve extension until about 1/2 inch protrudes from the swaged end. Using a low temperature lubricant on the control bulb is advisable.

STEP 8 - Using the protruding end of the control bulb as a guide, insert it into the copper sleeve (elbow) in the rear of the evaporator. Then push the sleeve extension over the end of the elbow to lock the two tubes together.

STEP 9 - Gently push the control bulb through the joined sleeves in 1-2 inch increments until it reaches the end inside the evaporator, taking care not to kink the line.

STEP 10 - Seal both ends of the new control sleeve with permagum to keep moisture out.

STEP 11 - Remove the mounting plate from the evaporator housing. Connect the 2 wires to the new control, the control to the mounting plate, the plate to the cooler, and replace the control knob.

STEP 12 - Turn the control knob to the #5 setting.

STEP 13 - Reassemble front of cooler and plug it in.

FRONT OF COOLER

Temperature Control

New Copper Sleeve Extension

EVAPORATOR

Standard Copper Sleeve

Permagum

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TECHNICAL SERVICE MANUAL - ALL MODELS

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TEMPERATURE CONTROL REPLACEMENT (FOR GDM & T-SERIES FREEZER

CABINETS WITH LARGER THAN 1/3 H.P. COMPRESSORS)

INSTALLATION INSTRUCTIONS

STEP 1 - Removing Power: Disconnect power to the unit.

WARNING:

Failure to disconnect power

to the unit may result in

electrocution to eld personnel.

STEP 2

Slide Door

Remove Louvered Grill:

WITH DANFOSS CONTROL.

Swing Door

Remove Louvered Grill:

Qualied Repair Personnel

• These repairs should be performed by a qualied service technician.

Tools Required

• Phillips-head Bit

• 1/4" Nut Driver Bit

• Wire Cutters

• Drill

• Needle-Nose Pliers

• Wire Strippers

• Crimping Tool

• Voltmeter

• Plastic Mallet or Hammer

• Slotted Screwdriver

Contents of Relay Kit

• Relay (and mounting screws)

• Relay Shield (and mounting screws)

• (4) Relay wires: 2 blacks, 1 pink, 1 white with insulated female spade connectors on one end.

• Grommet

• (4) Sta-con connectors

• New temperature control

• Instructions

A. To remove grill, loosen upper screw

on each end of grill and remove lower screws. Gently swing grill forward and up.

1a - Removing louvered grill

(slide door model)

STEP 3 - Accessing Wire Connections:

A. Remove ballast box cover by back-

ing out two hex head screws. (See Image 2).

NOTE: Wiring diagram is positioned on inside cover.

STEP 4 - Relay Connection Mounting:

A. With slotted screw driver and plastic

mallet or hammer, drive out knock out positioned on left side of ballast box. (See Image 3).

B. Install the supplied grommet* into the

knockout hole. (See Image 4).

C . Mount relay to underside of unit

on the left side of ballast box, and 3/4" back from the front edge of the underside.

NOTE: Mount relay next to the ballast box, so that when the relay shield is installed it covers the relay and all exposed wiring.

A. Remove screws as indicated by ar-

rows.

1b - Removing louvered grill

(swing door model)

2 - Removing ballast box cover

3 - Driving out knockout

4 - Installing the grommet

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Relay should be anchored with two self-tapping screws, (supplied in kit), as pictured in Image 5.

STEP 5 - Relay Temperature Control Wiring:

A. Connect the wires included in kit to the relay as follows:

1. Connect one black wire to one of the normally open contacts of the relay.

2. Connect the other black wire to the other normally open contact on the relay.

5 - Anchoring relay

6 - Relay wiring diagram

7 - Routing relay wires

3. Connect the pink wire to one side of the relay coil.

4. Connect the white wire to the other side of the relay coil.

NOTE: Each relay has a wiring diagram on the side of it. (See Illustration 6).

B. Feed wires into the ballast box through the knockout. (See Image 7).

C . Using the Sta-Con connectors in the relay kit, make the following connections inside

the ballast box:

1. Locate the pink wire coming from the temperature control and connecting to the black compressor receptacle wire. Cut this connection and connect this pink wire from the temp control to the pink wire going to the relay.

2. Connect one black wire on relay to the black wire cut from the compressor receptacle.

3. Connect the white wire coming from the relay to the white wire bundle that is connected to the white on the main power cord.

4. Connect one black wire to the black wire bundle that is connected to the outgoing terminal on the main power switch located on the ballast box.

STEP 6 - Replace existing temperature control with new Danfoss control in repair kit: (See Image 8).

8 - Temperature control leads

124

A. Connect one pink wire from old control to terminal #4 on new temperature con-

trol.

B. Connect other pink wire from old control to terminal #3 on new Danfoss tempera-

ture control.

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