GMV5 Home DC Inverter Multi VRF Units
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during full water test;
2）Fill water from the water tray of unit to make water level of water tray higher than the top
end of drain pipe. make the pipe full of water;
3）Check each joint of drain pipe to make sure there is no leakage.
10.1.6 Insulation for the condensate water pipe
A、Insulation materials
Use closed-cell foam insulation materials with retardant grade of B1.
The heat conductivity is not greater than 0.035 w/(m·k) when the average temperature is 0°C.
B、Thickness of the Insulation Layer
Thickness of the insulation layer for the condensate water pipe must be greater than 10 mm.
C、 Bond the insulation material joints with special glue and then wrap them with plastic
adhesive. The width of the adhesive must be greater than 5 cm to prevent dewing.
D、Insulation is not required for the outdoor part of condensate water pipes.
10.2 Insulation for air ducts
1）Insulation for air duct components and devices must be performed after the air leakage test
is performed or after quality check.
2）Use centrifugal glass wool or rubber and plastic materials for insulation or use novel
insulation air ducts.
3）The insulation layer should be flat and tight without any crack or gap.
4）Thickness of the insulation layer:
（1）For the air supply and return air duct laid in a room without an air conditioner, thickness of
the rubber and plastic insulation layer is 35 mm.
（2）For the air supply and return air pipe laid in an air conditioning room, thickness of the
rubber and plastic insulation layer is 20 mm.
5）Supports, hangers, and brackets of the air duct must be installed outside the insulation
layer. A chock must be provided between the support, hanger, or brackets and the air duct.
11.Installation and Insulation of Hot Water
System Pipeline
11.1 Connection of Hot Water System Pipeline
Hot water system pipeline mainly consists of circulating water inlet/outlet pipe between hydro
box and water tank, water inlet/outlet pipe of water tank, floor heating water pipe between hydro
box and floor heating room.
Preparation of Pipe: Hot water pipes are applied as circulating water inlet/outlet pipe. The
PPR pipe with outer diameter DN25 which is S2.5 series (thickness is 4.2mm) is recommended.
Hot water pipes are applied as inlet pipe for cold water and outlet pipe for hot water. The PPR pipe
with outer diameter DN20 which is S2.5 series (thickness is 3.4mm) is recommended. All applied
PPR pipes must comply with national standards GB/T18742. If other insulated pipeline are
adopted, the above can be reference.
Installation of circulating pipes: the water inlet of hydro box shall connect with outlet of
circulating pipe of water tank while the water outlet of hydro box shall connect with the inlet of
circulating pipe of water tank. The manual vent valve A shall be vertically installed upward near
the water inlet of hydro box. The manual vent valve B must be vertically installed downward
beside the inlet of circulating pipe of water tank. If the conditions are permitted, install the manual
vent valve B in the place which is convenient for users. The two vent valves above are equipped
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