Airwell ONG3-17 R410A, Service Manual

Page: 43 / 127

CONTROL SYSTEM
Service Manual-CN Fixed RPM series
12-8
Recover from the thermistor faults
1. ICT/OCT/RAT is disconnected or shorted –
The fault status will be cleared automatically when the connection is back to
normal.
2. ICT/OCT reading doesn’t change -
The ICT no-change error is cleared automatically if a 3
o
c change in ICT is
detected afterward. Similarly, the OCT no-change error is cleared by a change
in OCT.
This faults can also be cleared by switching the unit from STBY mode to operate
mode, or when the unit is reset (e.g. reset by power interrupt).
12.4 COOLING MODE
12.4.1 Cooling Mode – General
a. Room Temperature, RT, is detected by
x
RAT in normal operation, or
x
RCT (R/C sensor) in I-FEEL mode.
b. The resolution of RT is 1
o
c.
x
RT is activating COMP if (RT > SPT), and
x RT is stopping COMP if (RT =< SPT).
c. Indoor Coil Temp is detected by ICT (RT2).
d. Outdoor Coil Temp is detected by OCT (RT3).
e. OFAN OPERATIONS
x
OFAN starts together with COMP in general.