Gree GRS-1.5/D150ANbA-K, Service Manual

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GREE AIR SOURCE HEAT PUMP WATER HEATER SERVICE MANUAL
69
UNIT MAINTENANCE
1 Water Replenishment for the Water Tank
(1) Water replenishment procedure
①
Cut off the power supply of the unit, and open the cut-off valve of the hot water outlet pipe and
the valve at the location for water use.
②
Open the cut-off valve of the tap water inlet pipe.
③
When the water comes out from the location for water use, close the valve at the location for
water use.
④
Complete water replenishment, and switch on the power supply.
(2) Water tank drainage procedure
①
Cut off the power supply of the unit, and close the cut-off valve of the tap water inlet pipe;
②
Open the cut-off valve of the hot water outlet pipe and the valve at the location for water use.
③
Open the cut-off valve of the outfall;
④
After the water tank is drained, close the cut-off valve of the outfall. The drainage operations
are complete.
2 Regular Cleaning for the Water Tank
To ensure the quality of hot water you use, follow the following steps to regularly clean the water tank:
（
1
）
Cut off the power supply of the unit.
（
2
）
Close the cut-off valve on the water inlet pipe of the water tank.
（
3
）
Open the cut-off valve of the hot water outlet pipe and the valve at the location for water use.
（
4
）
Open the cut-off valve of the outfall until the water tank is drained.
（
5
）
Open the cut-off valve on the water inlet pipe of the water tank to clean the water tank. Close the
cut-off valve of the outfall until the water discharged from the outfall becomes clean.
（
6
）
Replenishment water for the water tank by following the water replenishment operations.
（
7
）
After the water tank is cleaned, switch on the power supply.
Note: Under normal conditions, the water tank can be cleaned once a year. If the water quality is poor,
you need to shorten cleaning frequency.
3 Safety Valve Maintenance
In the heating process, when the inner container of water tank is in overpressure, a small amount of
water may be discharged through the safety check valve, which is a normal phenomenon. However, if a
large amount of water is discharged through the safety check valve or even pipe vibration occurs and
abnormal noise is caused, contact Gree authorized maintenance centers. The possible causes of this
problem are as follows: The safety check valve is damaged; the water replenishment pressure is higher
than the maximum working pressure (0.7MPa) of the water tank, which occurs generally when pressure
reduction is not performed on the tap water. In normal conditions, the tap water pressure is around 0.3