Service manual

12-5
CONTROL SYSTEM
SM CINCO 1-A.1 GB
12.2.3.9 Base Heater
Heating element designed to melt any ice that is accumulated on the outdoor unit base during low heating
operation.
The base heater will be working only when RV is “ON” according to the following graph:
ON
OFF
OAT
0
2
Base
Heater
When OAT is faulty the base heater will be “ON” continuously in HEAT mode.
12.2.3.10 Cranckcase Heater
Heating element designed to heatup the compressor oil cranck case during low outdoor ambient temeratures.
The crank case heater operates only when compressor is off and according to OAT and CTT as following:
 In case of OAT failure - CTT is used for the operation, OAT ignored.
 In case of CTT failure - Coil heating is disabled.
12.2.3.11 Internal Coil Heater
The compressor is equied with built-in heating coils designed to heatup the compressor oil cranck case during
low outdoor ambient temeratures.
When CCHoutput=1 Coil heating is enabled.
When CCHoutput=0 Coil heating is disabled.
12.3 General Operating Rules
12.3.1 Power up Sequence
After Power up A/C must perform some initialization procedures.
 Thermistors short/disconnect.
 Compressor Driver communication connected and error codes if any.
 Fans connected – check feedback.
 EEPROM power up parameters uploads.
 EEV initialization – zero process.
 ODU-IDU-DMSMP communication check.