Continuous Heating Mode Control - Mitsubishi Electric PUHY-HP72 Service Handbook

[5-2 Outdoor Unit Control ]
5-2-8

Continuous heating mode control

(1) Continuous heating mode start conditions
Continuous heating mode will start when all the conditions listed in the table below are met (outside temperature, cumulative
compressor operation time, and piping temperature).
SW4 (848) must be set to ON to perform Continuous heating mode.
Outside temperature (TH7)
Cumulative compressor operation
time
Evaporating temperature (Te)
(2) Valve operation during Continuous heating cycle
1) HP72-120
Outdoor unit fan
SV1a
SV2
SV9
SV10
21S4a
21S4b
HWE18240_GB
2.0 °C [35.6 °F] to 7.0 °C [44.6 °F]
After 10 minutes at 2.0 °C [35.6 °F] to 3.5 °C [38.3 °F] has elapsed
After 20 minutes at 3.6 °C [38.5 °F] to 7.0 °C [44.6 °F] has elapsed
After 3 minutes at 0°C [32°F] to -25 °C [-13°F] has elapsed
Front (bottom) HEX in defrost cycle
Left fan: Fixed time control
Right fan: 0%
ON
ON
ON
Rear (front) HEX in defrost cycle
Right fan: 0%
Left fan: Fixed time control
OFF
OFF
ON
OFF
ON
OFF
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