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Mitsubishi Electric PURY-HP72 Service Handbook page 139

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[5-2 Outdoor Unit Control ]
(2) Defrost operation
Outdoou unit
Compressor frequency
Outdoor unit fan
SV1a
SV5b
21S4a
SV9
BC controller
LEV1
LEV3
SVM1
SVM2
SVM1b
SVM2b
SV B
SV A
(3) Stopping the defrost operation
The defrost cycle will end when 12 minutes have passed from the beginning of the defrost cycle, OR when the piping tem-
peratures (TH9, TH11, and TH6) have remained above the values listed in the table below for four minutes with SW4 (916)
being set to OFF or two minutes with SW4 (916) being set to ON.
The defrost cycle will not end for two minutes once started unless one of the following conditions is met : Pipe temperature
reaches 25°C [77°F] and SW4 (916) is set to OFF OR
*1 (5°C [41°F]
25°C [77°F]).
In the multiple-outdoor-unit system, defrosting is stopped on all units at the same time.
Model
72 model
96 model
(4) Problems during defrost operation
If a problem is detected during defrost operation, the operation will be stopped, and the defrost prohibition time based on the
integrated compressor operation time will be set to 20 minutes.
(5) Change in the number of operating indoor units during defrost operation
Even when there is a change in the number of operating indoor units during defrost operation, the operation will continue, and
an adjustment will be made after the completion of the defrost operation.
Defrost operation will be continued, even if the indoor units stop or under the Thermo-OFF conditions until it has run its course.
HWE13080
Model
HP72 model
HP96 model
Ports that are connected to the indoor units in cooling Thermo-ON
=25+TH7°C [77°F+TH7] and SW4 (916) is set to ON.
TH9, TH11, and TH6
SW4 (916) OFF
7°C [45°F]
7°C [45°F]
- 128 -
Compressor frequency
Stopped
ON (open)
ON (closed)
OFF
OFF (closed)
G type: 4000, GA type: 6000
G type: 1000, GA type: 2000
GB, HB type: 60 (full closed)
ON
OFF
ON
OFF
OFF
Other ports : OFF
SW4 (916) ON
12°C [54°F]
12°C [54°F]
107Hz
107Hz
GB

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