12-10
CONTROL SYSTEM
SM OU12HP 2-E.2 GB
12.5.4.2 General Rules
The fans will be off when the compressor is off unless HST>55 or faulty and than
OFAN_up will remain ON.
Min time for speed change between speed states is 60 seconds.
The fan speed is also related to protections.
Whenever OFAN fault occurs the compressor will be stopped.
12.5.4.3 Night mode
During night mode, the OFAN and the compressor will be limited to lower speeds (Cool model
only).
12.5.5 RV State Setting
During heat mode (except during Deicing) RV is ON.
During cool/SB mode RV is OFF.
RV status will be changed only if COMP is OFF for 3 minutes or more.
12.5.6 Base Heater Setting
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.
12.5.7 Crank case heater Operation
The crank case heater operates only when compressor is off and according to CTT as
following:
12.5.8 Compressor internal heating coil Operation
Only in 6HP unit.
The crank case heater operates only when compressor is off and according to CTT and OAT.
OFF
ON
-5 0
CTT
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