8-23
CONTROL SYSTEM
Revision Y05-01Service Manual - DNC Series
2) HEs are operated according to the room temp., in the same
way as in Heating for RH group (Sect 4.3).
3) IFAN is operating continuously at low speed.
4) Pumps operation is described in Sect 7.3 and 7.4.
4) For MBX model, HE1 and HE2 will be activated simultaneously
as the HE1 above.
7. Protection
7.1. Cooling Mode Protections
7.1.1. Indoor Coil Defrost
Mode: Cooling, Dry, Auto
Temp: Selected desired temp.
Fan: Any
Timer: Any
I Feel: On or Off
Control Function
Protect the indoor coil from ice formation at low ambient temperature.
ICT [
o
c]
+2
ON
OFF
ON
OFF
t1 t2 t3
COMP
OFAN
+1
+5
+14
0
-1
-6
ON
OFF
IFAN
J7 OPEN J7 CLOSED
t1 t1
t1 = 5 min minimum for each COMP starting
t2 = OFAN cycling (alternate between ON and OFF every 30 sec)
for 20 min maximum
t3 = COMP and OFAN stop for 10 min minimum
Notes:
1. When J7 is closed (connected), OFAN cycling is cancelled and the
set temperature for COMP & OFAN cut-out and cut-in are
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