Gree LSQWRF130M/NaD-M, Руководство по обслуживанию, Страница: 13 / 60

11
D Series Modular Air-cooled Scroll Chillers
Service Manual
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pump keeps running.
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unchanged and the water pump keeps running.
2.3 Freeze Protection
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through the wired controller, the unit will be protected again freeze. Free protection is factory defaulted to be ON.
When the module is in the freeze protection, its compressor will work as per the on/off setting and also the
princip
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2.4 Control to the Compressor
All compressors run as per the principle of “First On, First Off” and “First Off, First On”. See section 2.1 and
section 2.2.
2.5 Control to the Fan
The fan starts earlier than the compressor upon startup, and stops later than the compressor upon
shutdown. During defrosting, the fan and the 4-way valve stops. After defrosting they start again.
2.6 Control to the 4-way Valve
The 4-way valve is stopped at the cooling mode. At the heating mode, it will start after the compressor runs.
During defrosting it stops and then starts again after defrosting. It will stop later than the compressor upon shutdown.
2.7 Control to the Water Pump
When any module is required to run (incl. manual startup, timely startup, startup again freeze), water pumps
of all module starts. Then, when one module reaches the set point and is shut down, water pumps of all modules
keep running; when one module is shut down manually or timely, its water pump keeps running and will stop only
after all modules are shut down; when one module malfunctions and is shutdown, its water pump keeps running.
2.8 Control to the Electronic Expansion Valve
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2.9 Protection
2.9.1 Recoverable Protection
ƹ Compressor 1/2 low pressure protection
When it is detected the low-pressure switch of compressor 1 (compressor 2) is opened compressor 1
(compressor 2) will be shut down immediately.
Meanwhile the indicating LED will light on and the error information will be displayed among the error log
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ƹ Compressor 1/2 high discharge protection
When it is detected in three consecutive seconds that the discharge temperature of compressor 1
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will still run for some time.
Meanwhile the indicating LED will light on and the error information will be displayed among the error log
whic
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2.9.2 Irrecoverable Protection
ƹ Compressor 1/2 high pressure or over-current protection
When it is detected that the high pressure switch of compressor 1 (or compressor 2) is open, compressor 1
(or compressor 2) will be shut down but the fan will still last for some time.
Meanwhile the indicating LED will light on and the error information will be displayed among the error log
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