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Note On Adding Refrigerant
Safety And Leakage Check
CAUTION
• Refrigerant charging must be performed after wiring, vacuuming and the leak test.
•
DO NOT
exceed the maximum allowable quantity of refrigerant or overcharge the system.
Doing so can damage or impact the unit’s function.
• Charging with unsuitable substances may cause explosions or accidents. Ensure that the
appropriate quality and new R410a refrigerant is used.
Refrigerant containers must be opened slowly. Always use protective gear when charging the system.
•
•
DO NOT
mix refrigerants types.
Some systems require additional charging depending on pipe lengths. The standard pipe length varies
according to local regulations. For example, in North America, the standard pipe length is 7.5m (25’) per
circuit. In other areas, the standard pipe length is 5m (16‘). The additional refrigerant to be charged can
be calculated using the following formula:
Startup motes
ADDITIONAL REFRIGERANT PER PIPE LENGTH
Connective Pipe
Length
Air Purging
Method
Additional Refrigerant (
R410A:)
Pre-charge pipe length(ft/m)
(Standard pipe lengthxN)
Vacuum Pump
N/A
More than (Standard
pipe lengthxN)ft/m
Vacuum Pump
Liquid Side: Ø 6.35 (Ø 1/4”)
(Total pipe length - standard pipe lengthxN) x15g/m
(Total pipe length - standard pipe lengthxN) x0.16oZ/ft
Liquid Side: Ø 9.52 (Ø 3/8”)
(Total pipe length - standard pipe lengthxN) x30g/m
(Total pipe length - standard pipe lengthxN) x0.32oZ/ft
Electrical safety check
Perform the electric safe check after
completing installation:
1. Insulated resistance
The insulated resistance must be more
than 2M
Ω
.
2. Grounding work
After finishing grounding work, measure the
grounding resistance by visual detection and
grounding resistance tester. Make sure the
grounding resistance is less than 4
Ω
.
3. Electrical leakage check (performing during
test running)
During test operation after finishing
installation, the serviceman can use the
electroprobe and multimeter to perform
the electrical leakage check. Turn off the
unit immediately if leakage occurs.
Check and find out the solution to assure
the unit operates properly.
Gas leak check
1. Soap water method:
Apply a soap water or a liquid neutral
detergent on the indoor unit connection or
outdoor unit connections by a soft brush to
check for leakage of the connecting points
of the piping. If bubbles are noticed, the
pipes have leakage.
2. Leak detector
Use the leak detector to check for leakage.
NOTE:
The illustration is for explanation purpose
only. The actual order of A, B, C,D and E on the
equipment may be slightly different for the unit
you purchased. The actual shape shall prevail.
Indoor unit
check point
Outdoor unit
check point
A, B,C,D are points for 4 Zone system.
A, B,C,D, E are points for 5 Zone system.
Fig. 9.4