EDM SYSHP MINI SPLIT 06 16

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3.9.3 Leak detecon
Notes for installers

The general methods for idenfying the source of a leak are as follows:
1. Audio detecon: relavely large leaks are audible.
2. Touch detecon: place your hand at joints to feel for escaping gas.
3. Soapy water detecon: small leaks can be detected by the formaon of bubbles when soapy water is applied to a joint.
Figure 3-3.11: Leak detecon
A: Liquid side stop valve
B: Gas side stop valve
C/D: Connect joints between
outdoor unit and hydronic box
4. Refrigerant leak detecon: for leaks that are dicult to detect, refrigerant leak detecon may be used as follows:
a) Pressurize the piping with nitrogen at 0.3MPa.
b) Add refrigerant into the piping unl the pressure reaches 0.5MPa.
c) Use a halogen refrigerant detector to nd the leak.
d) If the leak source cannot be found, connuing charging with refrigerant to a pressure of 4.3 MPa and then search
again.
3.10 Vacuum Drying
3.10.1 Purpose
Vacuum drying should be performed in order to remove moisture and non-condensable gases from the system. Removing
moisture prevents ice formaon and oxidizaon of copper piping or other internal components. The presence of ice parcles in
the system would cause abnormal operaon, whilst parcles of oxidized copper can cause compressor damage. The presence of
non-condensable gases in the system would lead to pressure uctuaons and poor heat exchange performance.
Vacuum drying also provides addional leak detecon (in addion to the gas ghtness test).
Check poin of indoor unit
Check poin of outdoor unit