Airwell ONG3-17 R410A, Service Manual

Page: 40 / 127

CONTROL SYSTEM
Service Manual-CN Fixed RPM series
12-5
12.3 GENERAL FUNCTIONS FOR ALL MODELS
12.3.1 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
12.3.2 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
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
3 2 1