13-6
CONTROL SYSTEM
Revision Y05-01
Service Manual - DNG Series
13.3 General functions for all models
13.3.1 COMP operation
o For each Mode including POWER OFF & SB, a Min time delay of 3 min before
COMP restarting, excluding DEICING Mode.
o The Min operation time of COMP under different operating conditions is
Operation Mode
Min operation time of
COMP
Heat, Cool or Auto Modes 3 min.
Fan, Dry, Overflow, Protection modes, or mode change ignored
13.3.2 IFAN operation
o Whenever the IFAN starts from OFF to ON it will start in Low speed for 25 sec and
then will go to ANY speed.
o Min time interval between IFAN speed change in AUTOFAN Mode, is 30 sec.
o Min time interval between IFAN speed change in H/M/L Mode is 1 sec.
o IFAN speed in Heat/Cool Autofan Mode is determined according to the following
table:
'T
IFAN Speed
'T t 2
HIGH
2 t'T t 1
MED
1 t'T
LOW
where in Heat Mode:'T = SPT-RT
in Cool Mode:'T = RT-SPT
Note:
1. In Heat Mode, the rules in section 4.0.3 have the higher priority.
2. The table above can be represent by a hysteresis curve which will minimize
the switching of the IFAN relay and will minimize the change in IFAN speed:
T [
o
c]
L
M
H
IFAN speed
321
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