Electra PXD912 Service Manual page 80

CONTROL SYSTEM
e. Heaters operation rules for RH groups:
1) In RH group, HE operation is according to the difference between RAT and
SPT.
O N
O FF
O N
O FF
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.
(
RT
b) When
connected to the OCT, OFAN will operate according to the following
curve:
O N
O FF
11-14
H E2
H E1
-1 0
t  ) 2 t
SPT and ICT
O FAN
0
CONTENT
2
o
T=SP-R T [ c]
50
and the 4.7k: resistor is not
3
O C T
SM PXD 1-E.3 GB