Defrost Operation Control - Mitsubishi Electric PUHY-(E)P200 Service Handbook

[ VII Control ]

-7- Defrost Operation Control

(1) Starting the defrost operation
The defrost cycle starts when the pipe temperature (TH3), in the following table, or below has continuously been detected for
3 minutes after the integrated compressor operation time of 50 minutes have passed.
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
200 model
250 model
300 model
350 model
400 model
450 model
(2) Defrost operation
Compressor frequency
Outdoor unit fan
SV1a
SV5b, SV5c
21S4a
21S4b, 21S4c
SV9
LEV1
LEV2a
LEV2b
HWE07010
TH3
SW3 - 3 OFF
- 10°C [14°F]
- 10°C [14°F]
- 10°C [14°F]
- 8°C [18°F]
- 8°C [18°F]
- 8°C [18°F]
Model
200 model
250 model
300 model
350 model
400 model
450 model
Stopped
ON
ON
OFF
OFF
OFF
480 pulses
1400 pulses
1400 pulses
- 90 -
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]
Compressor frequency
60 Hz
65 Hz
65 Hz
103 Hz
103 Hz
103 Hz
GB