Continuous Heating Mode Control - Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook

[5-2 Outdoor Unit Control ]
5-2-7

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) (E)M200-450
*1
Outdoor unit fan
SV1a
SV2
SV9
SV10
21S4a
21S4b
*2
SV14
*2
SV15
*1. Only the fixed-time control is available on (E)M200-300 models.
*2. SV14 and SV15 are only on EM200-450 models.
2) (E)M500
Outdoor unit fan
SV1a
SV2
SV9
SV10
SV11
21S4a
21S4b
21S4c
18
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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
OFF (Closed)
ON (Open)
Front (right) HEX in defrost cycle
Left fan: Fixed time control
Right fan: 0%
ON
ON
ON
ON
ON
Rear (front) HEX in defrost cycle
Right fan: 0%
Left fan: Fixed time control
OFF
OFF
ON
OFF
ON
OFF
OFF (Closed)
OFF (Open)
Left HEX in defrost cycle
Left fan: 0%
Right fan: Fixed time control
In operation
OFF
ON
OFF
OFF
ON
ON
OFF
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