Electra EMD 40 - IFAN Operation Rules for RC and SH Groups; Heating Mode - General; Compensation Procedure; Heating Mode

7-12
CONTROL SYSTEM
Revision Y05-01
Service Manual - EMD Series
4 Heating Mode
4.1. Heating Mode - General
4.1.1. Compensation Procedure
When I feel is OFF during heat mode: RT= RAT – CTV.
When I feel is ON during heat mode: RT= RCT.
Model CTV
WNG, WMN, RWK. +3
o
C
MBX, PX, PRX, P2000, PXD +0
o
C
WMF, WAX +2
o
C
EMD/ELD +4
o
C
ECC-K +4
o
C
No compensation will be activated in Forced operation modes (Cf. Sect 11).
4.1.2. IFAN operation rules for RC and SH groups
(a) As a general rule for RC and SH groups, IFAN will be switched ON according to the
following graph:
Note 1: When COMP is ON (except WAX Model), IFAN will change from Low to OFF either when:
(1) ICT<28 and IFAN is on for 5 min or longer.
Or,
(2) ICT<20
Note 2: When ICT is faulty:
When the compressor switches from off to on (excluding deicing), IFAN will be on in ANY speed.
When the compressor switches from on to off, the IFAN will change to low speed for 30 seconds and then it
will be off.
(b) In SH or RC group, IFAN will operate for min 30 sec according to 0-(a) after HE’s
turned off, where in a case it has to be OFF, it will be forced to low speed.
4.1.1 IFAN operation rules for RH group
(a) In RH group, IFAN starts when HE starts. When HE switches to OFF, IFAN
switches to LOW for 30 sec and then stops.
30
17
32
20
ANY
LOW
OFF
IFAN
ICT
40
25
Ducted
General:
Window:
Note 1