Mitsubishi Electric PUHY-P1000, Руководство по обслуживанию

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[5-2 Outdoor Unit Control ]
- 96 -
HWE14040 GB
5-2-7 Defrost Operation Control
(1) Starting the defrost operation

The defrost cycle will start when all of the three conditions (outside temperature, cumulative compressor operation time, and
pipe temperature) under <Condition 1>, <Condition 2>, or <Condition 3> are met.
1) Evaporating temperature (Te)

The defrost cycle will not start if other outdoor units are in the defrost cycle or until a minimum of 10 minutes have passed
since the completion of the last defrost cycle.

If 10 minutes have passed since compressor startup or since the completion of a defrost cycle, a forced defrost cycle can be
started by setting DIP SW4(913) to ON.

Even if the defrost-prohibit timer is set to 90 minutes, the actual defrost-prohibit time for the next defrost cycle is 50 minutes
if the last defrost cycle took 12 minutes.

All units in the heating mode will simultaneously go into the defrost cycle in a system with multiple units. The units that are
not in operation may or may not go into the defrost cycle, depending on the cumulative operation time of their compressors.
(2) Defrost operation
Condition 1 Condition 2 Condition 3
Outside temperature
(TH7) -5ºC [23ºF] or above -5ºC [23ºF] or below
Cumulative compressor
operation time 50 minutes or more
90 minutes or more if the defrost prohibit timer is set to 90.
250 minutes or more
Evaporating tempera-
ture (Te) The evaporating temperature
has stayed below the tempera-
ture in the table below (Note1)
for 3 minutes (Te
≤
1.1 × TH7 - 7.5) continued
for 3 minutes or [{1.5 + 0.02 x
(20+TH7)} > 63LS] continued
for 3 minutes
The evaporating temperature
has stayed below the tempera-
ture in the table below (Note1)
for 3 minutes
P200 - P400 P450- P500
SW4 (915) OFF -13 ºC -11 ºC
SW4 (915) ON -8 ºC -8 ºC
Compressor frequency Model Compressor frequency
P200 - P250 models 79 Hz
P300 - P400 models 107Hz
P450 - P500 models 129Hz
Outdoor unit fan Stopped
SV1a ON
SV5b OFF (open)
21S4a OFF
21S4b, 21S4c OFF
SV9 OFF
SV10,SV11 OFF (Closed)
LEV1 0 pulses
*1
*1. This value may be greater than 0 pulse depending on the 63LS and TH4 status.
LEV2 2000 pulses