18
Performing leak test and insulation
Before completing the installation (insulating hose and pipes), you must check for gas leakage and when there is no leakage,
you may insulate the pipes and hoses.
Leak test
Use a gas detector to check the connection part of the pipes for gas leakage.
Gas side
Liquid side
Gas side
Liquid side
Insulation
Selecting the insulator of refrigerant pipe
f
Insulate the gas pipe and liquid pipe by referring to the thickness of insulator for each pipe size.
f
The standard temperature and humidity condition is 30 °C with humidity below 85 %. If the condition is in high humidity,
use one grade thicker.
Pipe
Pipe size (mm)
Thickness of the insulator [Cooling, Heating (mm)]
Remarks
Standard [30 °C, 85 %]
High humidity
[30 °C, 85 % or more]
EPDM, NBR
Liquid pipe
Ø6.35~Ø9.52
9 9
Heat resisting
temperature should be
over 120 °C
Ø12.70~Ø19.05
13
13
Gas pipe
Ø6.35
13
19
Ø9.52 ~ Ø28.58
19
25
1. To avoid condensation problems, wrap each pipes with heat-resisting
polyethylene foam.
- Make sure that the opening part of the insulation to face up.
No gap
Insulator
Heat-resisting polyethylene
foam
2. Wrap the refrigerant pipes and drain pipes with insulator.
Insulator
Install the insulation to be
overlapped
DVM Hydro
unit / Hydro
unit HT
Fix securely without any gap.
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