Service manual

25
2)FREEZE PREVENTION (COOLING)
•This function prevents freezing of the indoor heat exchange coil.
•When the compressor has been running for 10 minutes or more and the temperature of the indoor heat
exchange coil falls below –1°C, the control circuit stops the compressor for at least 6 minutes.
INDOOR
HEAT EXCH.
COIL TEMP.
ON ON ON ON
SET SPEED SET SPEED
OFF OFF
AFTER
6 MINUTES
6 MINUTES
MORE THAN
10 MINUTES
INDOOR
FAN
COMPRESSOR
–1°C
T +0.5°C
T°C
ROOM TEMP.
THERMO OFF
THERMO ON
SET
TEMP.
MORE THAN
10 MINUTES
3)OVERLOAD PREVENTION (HEATING)
•This function prevents overheating of the indoor heat exchange coil.
For indoor units SAP-UR228EH only
•When the temperature of the indoor heat exchange coil rises above 59°C, and if the indoor fan is L (low
speed), then the fan speed changes from L (low speed) to M (medium speed).
•When the temperature of the indoor heat exchange coil rises above 61°C, the outdoor fan stops.
INDOOR HEAT
EXCH. COIL
TEMP. °C
ON
OFF
ON
H o M o L
H ➔ H, M ➔ M, L ➔ M
ON
61
59
52
49
OUTDOOR
FAN
INDOOR
FAN
COMPRESSOR
H = High speed
M = Medium speed
L = Low speed