GREE Air-ccoled Closed Control Unit Service Manual
35
Item
Model
Charge volume(kg)
of refrigerants for
every 1 m longer of
connecting pipe
Charge
volume
(kg)of lubricants for
every 10 m longer of
connecting pipe
Notes
JKFD5DXXX
0.054
0.1
Use R410A
refrigerant and
POE lubricant
JKFD7DXXX
JKFD7XXX
JKFD13XXX
0.11
0.2
JKFD19XXX
0.17
0.2
JKFD25XXX
0.11×2
0.2×2
JKFD40XXX
0.17×2
0.2×2
JKFD40XXX
(single circuit
）
0.25
0.45
（
2
）
When the location of the outdoor unit is higher than that of the indoor unit, the altitude
intercept shall less than 30m while the location of the outdoor unit is lower than that of the
indoor unit, the altitude intercept shall less than 10m (try best to avoid such situation which
easily affects the cooling capacity of the unit). Total length of pipes cannot exceed 30m. When
the length of vertical gas pipes between indoor units and outdoor units is greater than 10m, set
a oil loop every 10m whose bending radius should be small as much as possible but cannot
less than 1.5 times of diameter of the pipe. If the installation length exceeds the above
requirements, please consult the manufacturer. Long connecting pipe accessory are needed.
（
3
）
The connecting pipe is copper pipe and its specification is Subject to the performance
form. Before connection, the copper pipe must be cleaned and dried.
（
4
）
After welding of connecting pipes, then the stain removal (blowing down welding slag
and impurities), it can be welded with the indoor unit and outdoor unit.
（
5
）
After connection of the pipe, it shall be filled with nitrogen to detect the leakage or
resort to vacuum pump and pressurization to detect leakage.
（
6
）
When the pipe connection of outdoor units and indoor units has been finished, the
pipe should be in the process of thermal insulation.
6.4.4
Installation of Humidifier
(1) Water supply pressure should be within 0.1MPa
～
1MPa. If the pressure exceeds 1MPa,
the decompressor i
s required while it’s less than 0.1MPa, water pump shall be pressurized.
(2) Tap water can be the resource of humidifying.
(3) Though Y-strainers have been with humidifiers, water treatment equipment should be
applied to purify the water with very poor quality (contained too much sand and impurities).
(4) Do not use the soft water due to its bad electric conductivity.
(5) Do not use the completely de-mineralized water (like purified water). Because the
working principle of humidifier is according to the ionization theory but the de-mineralized water
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