VIII. a - TEMPERATURE AIR SENSORS:
WARNING: DISCONNECT THE ELECTRICAL POWER
TO THE MACHINE AND FOLLOW LOCKOUT/TAGOUT
PROCEDURES.
1. Access the evaporator(s).
2. Remove the cabinet sensor from the
maintenance evaporator.
3. Remove coil sensors from both the maintenance
and blast chill evaporators.
4. Remove the food temperature probe receptacle
from cabinet ceiling.
5. Disconnect the sensor/probe wiring assembly
connector from the controller.
6. Reverse the procedure to install replacement
sensors.
VIII. b - EXPANSION VALVE:
WARNING: DISCONNECT THE ELECTRICAL POWER
TO THE MACHINE AND FOLLOW LOCKOUT/TAGOUT
PROCEDURES.
WARNING: THIS PROCEDURE REQUIRES THE USE
OF REFRIGERANTS. BE CERTAIN THE WORK AREA IS
WELL VENTILATED. SAFETY GOGGLES AND GLOVES
SHALL BE WORN SINCE REFRIGERANTS MAY CAUSE
INJURY TO THE SKIN.
1. Pump-down refrigeration system. Warning, after
pump-down, refrigerant lines will contain
pressure.
2. Access the expansion valve.
3. Detach expansion valve bulb from suction line.
4. Remove expansion valve from the liquid line at
inlet and outlet of valve.
5. Install new expansion valve into inlet line and
fasten bulb to suction line.
NOTE: Make sure expansion valve bulb is attached
parallel to suction line and makes good contact.
-9-
VII. SEQUENCE OF OPERATION (cont’d)
VII. f - CHILL OR FREEZE MODE BY TEMP (cont’d):
NOTE: Once the temperature of the probe reaches
the target temperature the display will alternate with
“DONE”, and the buzzer will sound.
a) At the end of the chill cycle the unit will enter
idle mode.
VII. g - BY PRODUCT CHILL OR FREEZE MODE:
1. Unit is in IDLE mode.
2. Product type is selected.
3. The refrigeration system will cycle on the
blasting air temperature set-point.
4. Chill mode is terminated when pre-programmed
condition is met. If product is chilled using BY
TEMP mode, all the product probes have reached
the target chill temperature. Or, if product used
BY TIME, when time expires.
NOTE: If BY TEMP mode was programmed, once the
temperature of the probe reaches the target temper-
ature the display will alternate with “DONE”, and the
buzzer will sound.
a) At the end of the chill cycle the unit will enter
idle mode.
VII. h - DEFROST MODE:
1. The defrost mode can be entered manually from
the idle mode or automatically from the hold
mode.
2. Defrost cycle length is by set minutes or until the
coil temperature reaches set-point.
a) If the defrost mode was entered from the
hold mode, the unit will return to the hold
mode.
3. After either the time has expired, or evaporator
temperature probes reach set-point, defrost heat
turns OFF.
NOTE: All TBC blast chillers include a hot gas
defrost. Therefore the compressors will operate
during defrost operation.
4. Unit waits for two minutes to allow water to drip
off evaporator coils.
a) Hot gas solenoid OFF.
b) Compressors are OFF.
c) Fans are OFF.
5. Fan Delay. After drip cycle, compressors are
enabled but fans stay OFF until the evaporator
coil(s) reach 20 degrees F.
VIII. SERVICE PROCEDURES
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