Gree A Series Service Manual page 90

(1)After the full water test, surface of the water tank should be de-rusted, finished and
treated with ant-corrosion measure. The artificial anti-rust class should be st3.
(2)After that, when water tank temperature is below 30℃, it should be painted with red lead
rust-proof paint twice. When the temperature is among 30～70℃, it should be painted with
chloroethylene 4~5 times. When the temperature is among 70～95℃, it should be painted
with heat-resistant anti-rust paint 4~5 times. Do not do directly welding on the water tank
with surface treatment.
(3)The water tank should be installed horizontally and placed at a bar support which should
go 100mm beyond at each side of the base plate. Height of the bar support should be no
less than 300mm.
(4)When water pipes are installed in the room without the heating system, the water tank,
expansion pipe, circulating pipe, and signal pipe all should be insulated.
(5)The installation height of the expansion water tank should be in the way that the lowest
level of the water tank is at least 1m above the highest point of the water system.
(6)For the mechanical circulating air-to-water system, in order to keep the expansion water
tank and water system run normally, the expansion pipes of the expansion water tank
should connect to the suction inlet of the circulating water pump. For the gravity circulating
system, the expansion pipes should connect to the top of the main supply water riser pipe.
(7)For the two-pipe air conditioning system, when there is only one expansion water tank for
cold and hot water, its effective volume should be figured out based on the heating
conditions.
(8)When the water tank is or higher than 1500mm, it should have ladders both inside and
outside of the water tank. When the water tank is or higher than 1800mm, it should have
two glass gauges to indicate the water level.
(9)The circulating pipe should be connected to the main return pipe. Horizontal distance be-
tween the connection point to the constant-pressure point should be no less than
1500~3000mm.
A Series Modular-type Air-cooled (Heat Pump) Chiller
85