Trial Run; Routine Startup/Shutdown; Maintenance During Long-Term Downtime; Startup After Long-Term Shutdown - Gree D Serie Manual Del Usuario

D Series Modular Air-cooled Scroll Chillers Owner's Manual

7.3 Trial Run

See the operation manual of the applicable controller for more details.
(1) When the unit has not been used for a long period or the ambient temperature is quiet low,
keep the unit energized 8 hours before startup to preheat the crankcase of the compressor
so as evaporate the liquid refrigerant inside the compressor which otherwise would cause
adverse effect on the compressor.
(2) Be sure valves are opened properly to prevent the compressor from being damaged by the
abnormal high pressure.
(3) Carefully adjust the flow control valve and the shutoff valve of the chilled water system to
make the flow rate meet the rated value on the nameplate.
(4) Turn on the wired controller to check the error record. If any error exists, eliminated it
before restarting the unit.
(5) When the trial run takes 30 minutes and the entering/leaving water temperature approaches
the regulated range, It is able to set the entering/leaving water temperature based on the
actual load. The unit should be restarted at least 10 later after the shutdown. Then, check
the set points of the controls in accordance with the instructions of the control system.
WARNING ！
(1) During flushing, be sure the control panel on the main unit is disabled to start/stop the
water pump.
(2) Do not start up the unit before the water system has not yet been drained up.
(3) Do not restart the unit when the unit has been stopped less than for 6 minutes.

7.4 Routine Startup/Shutdown

It is recommended to start the system through the wired controller in the sequence of the water
pump first and then the main unit, and stop the system in a reverse sequence. Remember to keep the
unit energized 8 hours before startup to preheat the crankcase of the compressor so as evaporate the
liquid refrigerant inside the compressor which otherwise would cause adverse effect on the compressor.
NOTE: When the water temperature is lower than 15~20℃ , do not start the terminal equipment
until the water temperature reaches higher than 35℃ for guaranteeing a sound and reliable operation.

7.5 Maintenance during Long-term Downtime

When the chiller is going to be stopped for a long period, maintenance listed below shall be performed:
(1) Take the leakage test for the refrigerant tube. If leakage occurs, eliminate it.
(2) Maintain the water pump and air conditioning divides in accordance with the suggestions
provided by the manufacturer.
(3) Drain the water system by opening the discharge valve (especially in winter) to avoid
frostbite on the shell and tube.
(4) Switch off the power supply of the chiller and the water pump.
(5) Clean and dry the inside and outside surface of the chiller. Then, cover it against dust.

7.6 Startup after Long-term Shutdown

Preparations shall be taken when starting up the chiller which has not been used for a long period.
(1) Completely check and clean up the chiller.
(2) Clean the water piping system.
(3) Check the water pump.
Copyright 2018. This translation is property of GREE PRODUCTS SL. All rights reserved. Total or partial reproduction without its express authorization is prohibited.
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