Defrost Operation Control - Mitsubishi Electric PURY-EP200 Service Handbook

[ VII Control ]

-7- Defrost Operation Control

(1) Starting the defrost operation
The defrost cycle starts when the pipe temperature (TH6), in the following table, or below has continuously been detected for
3 minutes after the integrated compressor operation time of 50 minutes have passed (90 minutes when the defrost prohibit
timer is set to 90 minutes).
If 10 minutes have passed since compressor start-up or since the completion of defrost operation, forced defrost operation
will start by turning on the forced defrost switch (DIP SW2-7).
Even if the defrost prohibit timer is set to 90 minutes, the actual defrost prohibit time for the next operation will be 50 minutes
if defrosting took 12 minutes.
In the multiple-outdoor-unit system, all of the outdoor units that are in operation go into the defrost mode simultaneously. The
unit(s) that is stopped at the time defrost operation starts remains stopped.
Model
P250 model
P300 model
P350 model
P400 model
EP200 model
EP250 model
EP300 model
(2) Defrost operation
Outdoou unit
BC controller
HWE0713A
SW3 - 3 OFF
- 10°C [14°F]
- 10°C [14°F]
- 8°C [18°F]
- 8°C [18°F]
- 10°C [14°F]
- 8°C [18°F]
- 8°C [18°F]
Compressor frequency
Outdoor unit fan
SV1a
SV2
SV5b
2 1 S 4 a
SV9
LEV1
LEV3
SVM1
SVM2
SVM1b
SVM2b
SV B
SV A
TH6
SW3 - 3 ON
- 5°C [23°F]
- 5°C [23°F]
- 5°C [23°F]
- 5°C [23°F]
- 5°C [23°F]
- 5°C [23°F]
- 5°C [23°F]
Model
P250 model
P300 model
P350 model
P400 model
EP200 model
EP250 model
EP300 model
OFF (closed)
G type: 4000, GA type: 6000, HA type: 8000
G type: 1000, GA type: 2000, HA type: 2000
GB, HB type: 60 (full closed)
Ports that are connected to the indoor units in cooling Thermo-ON
Other ports : OFF
- 124 -
Compressor frequency
65 Hz
65 Hz
103 Hz
103 Hz
65 Hz
103 Hz
103 Hz
Stopped
ON (open)
ON (open)
ON (open)
O F F
ON
OFF
ON
OFF
OFF
GB