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TEMPERATURE CONTROLS SEQUENCE OF OPERATION

WWW

.TRUEMFG.COM

STARTUP

A. Temperature controls are factory-set to give refrigerators an approximate temperature of 35°F (1.6°C) and freezers an

approximate temperature of -10°F (-23.3°C). Allow unit to function several hours, completely cooling cabinet before changing

the control setting.

Temperature Control Location and Settings.

• Temperature control type will vary upon model and age of cabinet.

• Mechanical control or electronic control without display:

- Inside cabinet

- Behind cabinet

- Behind front or rear access grill

• Electronic control with display:

- In countertop

- In top louvered panel

- In or behind bottom louvered grill

B. Excessive tampering with the control could lead to service difficulties. Should it ever become necessary to replace temperature

control, be sure it is ordered from your TRUE dealer or recommended service agent.

OPERATION

Summary of content (9 pages)

PAGE 1
TRUE TEMPERATURE CONTROLS SEQUENCE OF OPERATION WWW.TRUEMFG.COM OPERATION STARTUP A. Temperature controls are factory-set to give refrigerators an approximate temperature of 35°F (1.6°C) and freezers an approximate temperature of -10°F (-23.3°C). Allow unit to function several hours, completely cooling cabinet before changing the control setting. Temperature Control Location and Settings. • Temperature control type will vary upon model and age of cabinet.
PAGE 2
TRUE TEMPERATURE CONTROLS SEQUENCE OF OPERATION WWW.TRUEMFG.
PAGE 3
TRUE TEMPERATURE CONTROLS SEQUENCE OF OPERATION WWW.TRUEMFG.COM MECHANICAL TEMPERATURE CONTROLS COIL SENSING An evaporator coil sensing temperature control ensures that the evaporator coil will remain clear of frost and ice by not allowing the compressor to restart until the coil temperature is above the freezing temperature. This is considered an off cycle defrost. Note: Some Deli Cabinets with a gravity coil system will use a regular defrost cycle without heaters to assist in clearing the coil.
PAGE 4
TRUE TEMPERATURE CONTROLS SEQUENCE OF OPERATION WWW.TRUEMFG.COM MECHANICAL TEMPERATURE CONTROLS MECHANICAL CONTROL FREEZER GENERAL SEQUENCE OF OPERATION 1. Cabinet is plugged in. a. Interior lights will illuminate on glass door models only. If lights do not come on, verify the light switch is in the “ON” position. Solid door cabinets may or may not have lights that may be controlled by the door switch. 2. The compressor only will start if the temperature control is calling for cooling.
PAGE 5
TRUE TEMPERATURE CONTROLS SEQUENCE OF OPERATION WWW.TRUEMFG.COM MECHANICAL TEMPERATURE CONTROLS MECHANICAL CONTROL TFM/TDC/THDC GENERAL SEQUENCE OF OPERATION 1. Cabinet is plugged in. 2. The compressor only will start if the temperature control is calling for cooling. (If the compressor does not start, verify that the temperature control is not in the “OFF” or “0” position. 3 The temperature control will cycle the compressor on and off. a. The temperature control is sensing the coil temperature. b.
PAGE 6
TRUE WWW.TRUEMFG.COM TEMPERATURE CONTROLS SEQUENCE OF OPERATION Some refrigerators used for special applications may have an air sensing control. These cabinets will run at a temperature where the evaporator coil never has the potential to freeze. MECHANICAL TEMPERATURE CONTROLS White Wine: 45-50ºF (8.2-10ºC) Red Wine / Chocolate: 50-55ºF (10-12.8ºC) GDM / T-Series Coolers Old location (Old sensor was coil sensing and was located in the coil).
PAGE 7
TRUE WWW.TRUEMFG.COM TEMPERATURE CONTROLS SEQUENCE OF OPERATION MECHANICAL TEMPERATURE CONTROLS HOW TO DIAGNOSE STEP 3 - Cut-out is the OFF temperature. NOTE: All temps are at midpoint setting #5. All temps advised have a +/- 2 degree variance.
PAGE 8
TRUE WWW.TRUEMFG.COM TEMPERATURE CONTROLS SEQUENCE OF OPERATION MECHANICAL TEMPERATURE CONTROLS CHECKING THE CUT IN AND CUT OUT OF THE TEMPERATURE CONTROL COIL SENSING AIR SENSING Example of checking coil temperature for a coil sensing thermostat. Position thermometer as close as possible to the control sleeve in the evaporator coil. Example of checking air temperature for an air sensing thermostat. Position thermometer as close as possible to the “pig tail” at the end of the thermostat bulb.
PAGE 9
TRUE WWW.TRUEMFG.COM TEMPERATURE CONTROLS SEQUENCE OF OPERATION MECHANICAL TEMPERATURE CONTROLS WHEN TO MAKE AN ADJUSTMENT TO A MECHANICAL TEMPERATURE CONTROL We advise to make a mechanical temperature control adjustment only for a high altitude location.