Electra Gcz 12, Service Manual

Page: 74 / 205

12-4
CONTROL SYSTEM
Revision Y05-01 Service Manual - WMZ
12.4 General functions
12.4.1 COMP operation
For each Mode including POWER OFF & SB, a Min time delay of 3 min
before COMP restarting, excluding DEICING Mode
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
12.4.2 IFAN operation
•
Min time interval between IFAN speed change in AUTOFAN Mode, is 30 sec.
•
Min time interval between IFAN speed change in H/M/L Mode is 1 sec.
•
IFAN speed in Heat/Cool Autofan Mode is determined according to the following table:
∆
T IFAN Speed
∆
T
≥
2 HIGH
2
≥ ∆
T
≥
1 MED
1
≥ ∆
T LOW
where in Heat Mode:
∆
T = SPT-RT
in Cool Mode:
∆
T = RT-SPT
Note:
•
In Heat Mode, the rules in section 4.0.3 have the higher priority.
•
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
3 2 1
12.4.3 OFAN operation
•
Min time interval between OFAN ON/OFF state change is 30 sec.
•
In general, OFAN starts together with COMP.
12.4.4 HE operation
•
Minimum Heaters ON or OFF time is 30 sec.
•
Heaters can be activated only if IFAN is on.