Airwell ONG3-17 R410A, Service Manual

Page: 47 / 127

CONTROL SYSTEM
Service Manual-CN Fixed RPM series
12-12
(b) In RC and SH groups , whenever COMP & HE are both OFF , excluding
protection modes, IFAN operation will be according to the following:
In other models IFAN will operate in low speed for 30 sec and then stop. If
COMP is OFF for more than 3 minutes and IFEEL Mode is inactive, IFAN will
operate in low speed according to the following graph:
IFAN (Low Speed)
(c) In RH group , IFAN starts when HE starts. When HE switches to OFF, IFAN
switches to LOW for 30 sec and then stops.
4. HE operation
(a) For all Groups , HE can be ON only when IFAN is ON.
(b) For all Groups , HE switches to OFF when ICT > 50
o
c, and is activated again
when ICT d 45
o
c.
(c) In SH or RC group , HE operation is limited by the following graph:
HE
ON
OFF
30
45 50
ICT [
o
c]
15
General :
For WAX : 35
20
40
(d) Back-up mode for SH group
After COMP has been working for 5 minutes, HE & IFAN are activated even if the
ICT is still below 35
o
c. This situation is called Back-up Mode. Both HE & IFAN will
work in Back-up Mode until the ICT reaches 35
o
c. Then, the operation goes on in
the usual mode