7-13
CONTROL SYSTEM
Revision Y05-01
Service Manual - EMD Series
4.1.2
Heaters operation rules for
RC and SH groups
(a) For both
RC
and
SH groups
, Heaters versus T is as the following:
OFF
ON
ON
OFF
HE1
HE2
1
2 3 4
T=SP-RT [
o
c]
(b) Operation rules for Heaters in
RC group
:
(i)
Heaters can be enabled only if IFAN is ON.
(ii) Heaters will operate according to T
and
the following graph:
32
20
20
15
50
ON
OFF
ICT
45
HE-1
&
HE- 2
General:
Window:
(c) Rules for Heaters operation in
SH group
:
(i)
When heaters are to be ON and IFAN is to be OFF according to 4.1.2 (a), IFAN will be
forced to low speed.
(ii) Heaters will operate according to T
and
the following graph:
(d) F
o
r
b
o
t
h
RC
and
SH
groups, excluding deicing, HE1 and HE2 can be on only when the compressor is on.
50
ON
OFF
ICT
45
HE - 2
37
42
HE -1
ON
OFF