Gree A Series Service Manual page 86

4) When a flange is connected with another, they should match each other naturally to
avoid pipes or equipment from producing extra stress.
5) The flange at the branch should keep a distance of at least 100mm from the main pipe,
and the flange at the thru-wall pipe should keep a net distance of at least 200mm with
the wall.
6) When a flange is connected to the unit, a wash should be placed at the center of the
flange without any deviation. Except for design requirements, do not used dual-layer,
multi-layer, or tilted washers.
5.5.2.6 Installation of Valves and Water Filters
(1)Installation location, height and direction of valves should be correct. And they should be
arranged orderly within a deviation of 3mm in the same plane.
(2)The valve stem can't be downward but toward the direction which will facilitate its
operation.
(3)Attention should be paid to the arrow which indicates the direction of fluid in the valve.
(4)Installation of electric valves and solenoid valves should be guided by electricians. They
should be commissioned prior to installation.
(5)The water filter is usually installed at the inlet pipe of the water pump and other equip-
ment. Pay attention to the water flow direction.
(6)The automatic exhaust valve should be installed at the highest point of the system. In or-
der to facilitate maintenance, a gate valve should be installed upstream of the automatic
exhaust valve.
(7)A drain pipe or drain valve should be installed at the lowest point of the water system. For
the closed-circuit system, an exhaust valve should be installed at the highest point of the
system and where a large amount of air may be trapped.
(8)The water filter should be installed at the inlet pipe in correction direction and easily be
cleaned. Material of the filter screen should meet the design requirements.
5.5.2.7 Pressure Test
The pressure test includes single item pressure test and whole system pressure test. The
former is done when the main pipes or concealed pipes have been installed. The latter is done
A Series Modular-type Air-cooled (Heat Pump) Chiller
81