[
VIII
Control ]
- 74 -
HWE07150
GB
-7- Defrost Operation Control
(1) Starting the defrost operation
The defrost operation starts when the pipe temperature (TH3) has continuously been detected to be at -10°C [14°F] or below
for 3 minutes after the integrated compressor operation time exceeds 50 minutes (if the defrost prohibit timer is set to 90 min-
utes, the actual defrost prohibit time for the next operation will be 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.
(2) Defrost operation
Compressor frequency
Model
Compressor frequency
250 model
98 Hz
Outdoor unit fan
Stopped
SV1a
ON
SV5b
ON
21S4a OFF
21S4b
OFF
SV9
OFF
LEV1 480
pulses
LEV2a 1400
pulses
LEV2b 1400
pulses
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