Service manual

12-10
CONTROL SYSTEM
SM CINCO 1-A.1 GB
12.4.3 Cooling Mode
12.4.3.1 Cooling Mode – General
a. Mode Definition
Mode: COOL, AUTO (at Cooling)
Temp: Selected desired temperature.
Fan: LOW, MED, HIGH, TURBO, AUTO.
Timer: Any
I-FEEL: ON or OFF
b. Room Temperature, RT, is detected by:
RAT in normal operation, or
RCT (R/C sensor) in I-FEEL mode.
c. Indoor Coil Temp is detected by ICT.
12.4.3.2 Control Functions
a. COMP Operation
In general – the operation is set by the NLOAD calculation in indoor unit side.
Other rules are according to section 12.5.1.
b. OFAN Operation
In normal operation OFAN operates together with the COMP.
Other rules are according to section 12.5.3.
c. IFAN Operation
IFAN will operate in ANY speed regardless the ICT or COMP state.
IFAN speed will be determined according to user selection or
AUTO-FAN logic (see para. 12.4.2.2)
d. RV is OFF during COOL mode.
e. HEATERS are OFF during COOL mode.
f. PUMP operates in cool/dry mode.
12.4.3.3 Sequence Diagrams
Maintaining room temp at desired level by comparing RT and SPT with user defined IFAN speed.
0
+1
+2
+3
-3
-2
-1
(RT - SPT) [
q
C]
COMP
OFAN
IFAN
RV
ON
OFF
ON
OFF
OFF
ON
OFF
User Fan Speed
COMP Speed
decrease
COMP Speed
increase
OFAN Speed
decrease
OFAN Speed
increase