Electra OU10-36 ST Service Manual download pdf (Page 92)

13-21

CONTROL SYSTEM

SM DNGRPM 1-E.4 GB

3.8 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.

ICT [

OFF

t1 t2 t3

COMP

OFAN

+14

-1

-6

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 changed. COMP &

OFAN are forced OFF when ICT =< -6

c, and are kept OFF until ICT > 14

2. For WAX model, the defrost processes is simpler. When J7 is open, COMP &

OFAN are forced OFF when ICT =< -1

c, and are kept OFF until ICT > 5

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.

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Electra OU10-36 ST Service Manual Page 92