Manual Valve Activation Mode - Sub-Zero 424HAG/O-2 Service Manual

Electronic Control System

Manual Valve Activation Mode

Manual Valve Activation Mode forces the refrigerant valve to open (feeding refrigerant to the desired evaporator),
and energizes the appropriate evaporator fan motor, as well as the compressor and condenser fan motor. Once ini-
tiated, this mode lasts for five (5) minutes, during which time the evaporator temperature for that compartment is dis-
played at the control panel.
While in this mode, the Service Technician can observe the evaporator temperatures, and check for proper voltage
readings at the activated components without having to wait for the evaporator to call for cooling.
To initiate Manual Valve Activation Mode, the unit must be ON, then press and hold the desired compartment COLD-
ER key and UNIT ON/OFF key for ten (10) seconds (See Figure 3-35). The evaporator temperature for that com-
partment will be displayed in left display window and the right display window will show the thermistor location code.
NOTE: If the COLDER and UNIT ON/OFF keys are pressed and held for less then ten (10) seconds, Diagnostic
Mode will be initiated. This was covered earlier in the section.
NOTE: It is possible to toggle through the other temperature readings, as in Diagnostic Mode, but in this case the
temperature readings will last for five (5) minutes rather than ten (10) seconds.
NOTE: The compressor overload could prevent the compressor from energizing.
NOTE: Manual Valve Activation Mode will end five (5) minutes after initiated. It is possible to end this five (5)
minute run time and return to normal operation by switching the unit OFF then back ON. If this is done, note that
the electronic control will observe a three minute minimum compressor OFF time when the unit is switched back
ON. This is to protect the compressor and its electricals.
Press and Hold Desired COLDER Key and UNIT ON/OFF Key for 10 Seconds
#3758410 - Revision C - May, 2014
Wine Storage
Wine Storage
Press and hold for 10 seconds
Figure 3-35. Initiating Refrigerant Valve Activation Mode:
(400-
(400-
3-18
Series
Series
2
2
)
)