CONTROL SYSTEM
11-14 SM PXD 1-E.3 GB
e. Heaters operation rules for RH groups:
1) In RH group, HE operation is according to the difference between RAT and
SPT.
-1 0 2
T=SP-RT [
o
c]
HE1
HE2
ON
ON
OFF
OFF
f. OFAN Operation for RC and SH groups
1) As a general rule for RC and SH groups, excluding protection modes, OFAN
starts with the compressor.
2) When OFAN is ON it will operate according to the following conditions:
a) OFAN operates together with the compressor.
b) When
50)2( ICTandSPTRT
and the 4.7k resistor is not
connected to the OCT, OFAN will operate according to the following
curve:
0 3
ON
OFF
OCT
OFAN
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