4-26
Table 4-7. Manual Override Operation of Microprocessor
MODE
STEP
OPERATION
DISCONNECT WIRE
JUMPER WIRE
1
Condenser Fan
PD14 to TB15 from TB15
TB15 to CFC1
Full Cooling
2
Compressor
PD2 to TB7 from TB7
TB7 to CC1
3
Evaporator Fan
PD6 to TB14 from TB14
TB14 to EFC1
Low Heating
3
Evaporator Fan
Perform step 3
Perform step 3
High Heating 3 & 4 Resistance Heaters & Evap. Fans
Perform steps 3 & 4
Perform steps 3 & 4
Defrost
4
Resistance Heaters
PD9 to TB16 from TB16
TB16 to HRC1
WARNING
Make sure power to unit is OFF (CB-1 & CB-2) and power plug(s) disconnected before working inside the control box.
CAUTION
Overheating and cycling of heaters by HTT will result if unit is left in a defrost condition (step 4) after all frost has been
melted from the evaporator coil and water ceases running from the drain hose.
NOTES
1. If microprocessor controller alarm functions remain operational, manual override jumpering will result in false alarms
being indicated.
2. Defrosting will only occur when step 4 alone is performed (steps 1, 2 & 3 interrupted), and prior operation has been at frost
forming temperatures.
3. When performing the emergency jump bypass of the microprocessor the unit may still be started/stopped using
start/stop switch (ST).
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