Gree LSQWRF35VM/NaA-M, Service Manual

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Test Operation, Troubleshooting and Maintenance
(1) Is the water flow direction in the condenser and evaporator correct?
(2) Are the chilled water pipes clean? Is there any foreign matter trapped in the joints? Is the water
quality satisfactory?
(3) Is the insulation of the chilled water pipes in good condition?
(4) Are the manometer and thermometer connected correctly (Is the manometer at a right angle with
the water pipe, and is the thermometer’s probe inserted into the water pump)? Do the initial values
of the manometer and thermometer comply with requirements before commissioning?
(5) Is the leaving water flow switch installed correctly? Is this flow switch correctly wired to the electric
control cabinet?
(6) Start the chilled water pump through the contactor and see: does the chilled water pump run in the
correct direction (-clockwise)? If not, check the wiring of the water pump.
(7) Run the chilled water pump and see: is the water pressure stable? do the reading values of water
pressure change slightly? Is the running ampere in the rated range? If not, just handle all of them.
(8) Does the water makeup device of the expansion water tank work well? Does the automatic exhaust
valve work well? For the hand exhaust valve, open it to exhaust air inside the system.
◆
Check the work load
(1) Are the air handling units connected correctly?
(2)
Do all diffusers work smoothly?
(3) Are the tightness and insulation of the conditioned space in good condition?
(4) Does t
he required load match with the capacity of the unit?
WARNING
• Do not check the power supply without any proper detection device and preventive measures, or it
would lead to severe in juries or even death.
• Each single unit should be supplied with dedicated power lines. After wiring, check the following items
one by one.
1) Is the size of the air switch proper?
2) Does all electric installation meet corresponding electric standards or codes?
3)
Is all wiring correct?
4) Are all interlocks work well?
5) Do all contacts work well?
6) Are the power supply and insulation in good condition?
7) Is the setpoint of the control and protection elements correct?
4.1.5 Check for initial run
Check for initial run should be performed by four steps as shown below when the unit is ready for initial
run.
◆
Check for communication
Check if the displayed number of modules is the same as the real number. If so, it indicates
communication goes normal. If not, take the following inspections.
(1) Are all connected units powered on?
(2) Does each single unit have a unique address?
(3)
Is there any single unit which has not been detected by the control? Is the communication line of
the mainboard connected correctly or is the communication line itself non-defective?