Mitsubishi Electric PURY-P200YLM-A(1) Service Handbook page 151

[5-2 Outdoor Unit Control ]
(2) Defrost operation
Outdoou unit
BC controller
* When PWFY-AU model units are connected, SVA and SVC on the BC should be set to ON.
* Outdoor air temperature (TH7) < -10°C and SVA and SVB are ON when PWFY-AU is not connected
(3) Stopping the defrost operation
The defrost cycle ends when 12 minutes have passed since the beginning of the cycle, or when the pipe temperatures (TH3
and TH6) have been continuously detected for 4 minutes (when SW4 (916) is set to OFF) or 2 minutes (when SW4 (916) is
set to ON) that exceeds the values in the table below.
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 α
*1 (5°C [41°F] ≤ α ≤ 25°C [77°F]).
In the multiple-outdoor-unit system, defrosting is stopped on all units at the same time.
Model
(E)P200 model
(E)P250 model
(E)P300 model
(E)P350 model
(E)P400 model
(E)P450 model
(E)P500 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.
HWE1314A
Compressor frequency
Outdoor unit fan
SV1a
SV5b
21S4a, 21S4b
SV9
LEV1
LEV3
SVM1
SVM2
SVM1b
SVM2b
SVB
SVA
SW4 (916) OFF
7°C [45°F]
7°C [45°F]
7°C [45°F]
7°C [45°F]
7°C [45°F]
7°C [45°F]
7°C [45°F]
Model
(E)P200, (E)P250 models
(E)P300, (E)P350, P400 models
EP400, (E)P450, (E)P500 models
G type: 4000, GA type: 6000, HA type: 8000 (60 or 41)
G type: 1000, GA type: 2000, HA type: 2000 (60)
GB, HB type: 60 (full closed)
Ports that are connected to the indoor units in cooling Thermo-ON
*1
=25°C+TH7°C [77°F+TH7°F] and SW4 (916) is set to ON.
TH3 and TH6
SW4 (916) ON
12°C [54°F]
12°C [54°F]
12°C [54°F]
12°C [54°F]
12°C [54°F]
12°C [54°F]
12°C [54°F]
- 140 -
Compressor frequency
79Hz
107Hz
112Hz
Stopped
ON (open)
ON (closed)
OFF
OFF (closed)
ON
ON
ON
OFF
OFF
Other ports : OFF
GB