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[ VIII 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 (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
(Outdoor unit model)
250 model
350 model
400 model
(2) Defrost operation
Compressor frequency
Outdoor unit fan
SV1a
*1
SV5b, SV5c
21S4a
*1
21S4b, 21S4c
SV9
LEV1
LEV2a
*1. Applicable to the P350 and P400 models only.
*2. This value may be greater than 0 pulse depending on the 63LS and TH4 status.
HWE10190
TH3
SW3 - 3 OFF
- 10°C [14°F]
- 8°C [18°F]
- 8°C [18°F]
Model
(Outdoor unit model)
250 model
350 model
400 model
OFF (open)
3000 pulses
- 95 -
SW3 - 3 ON
- 5°C [23°F]
- 5°C [23°F]
- 5°C [23°F]
Frequency
65 Hz
103 Hz
103 Hz
Stopped
ON
OFF
OFF
OFF
*2
0 pulse
GB
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