Service manual

12-11
CONTROL SYSTEM
SM CINCO 1-A.1 GB
12.4.4 Heating Mode
12.4.4.1 Heating - General
a. Mode Definition
Mode: HEAT, AUTO (at heating)
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.
12.4.4.2 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 operates according heat mode rules. See section 12.4.2.3.
d. RV is ON during HEAT mode.
e. HEATERS – See section 12.4.9.
f. PUMP is OFF during heat mode.
12.4.4.3 Sequence Diagram
Maintains room temp. at desired level by comparing RAT or RCT to SPT.
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
See IFAN Rules