Electra DNG 18 Service Manual page 86

13.8 Cooling Mode Protections
13.8.1 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.
o
ICT [ c]
+14
+5
+2
+1
0
-1
-6
t1
ON
OFAN
OFF
ON
COMP
OFF
ON
IFAN
OFF
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 changed. COMP &
OFAN are forced OFF when ICT =< -6
2. For WAX model, the defrost processes is simpler. When J7 is open, COMP &
OFAN are forced OFF when ICT =< -1
When J7 is closed, the WAX defrosting process is the same as that of the other
models (R.H.S. of the graph above). In both cases, the ICT checking in t2 and
t3 are not applied.
Service Manual - DNG Series
t2 t3 t1
J7 OPEN
Revision Y05-01
CONTENT
t1
o
c, and are kept OFF until ICT > 14
o
c, and are kept OFF until ICT > 5
CONTROL SYSTEM
J7 CLOSED
o
c.
o
c.
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