Instructions / Assembly

 Page 21 
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 may damage or impact the unit’s function.
• Charging with unsuitable substances may cause explosions or accidents. Ensure that the
appropriate refrigerant is used.
Refrigerant containers must be opened slowly. Always use protective gear when charging the system.
•
• DO NOT mix refrigerant types.
N=2 (one-twin models), N=3 (one-three models), N=4 (one-four models), N=5 (one-ve models).
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 7.5 m (25 ft)
In other areas, the standard pipe length is 5 m (16 ft). The additional refrigerant to be charged can be
calculated using the following formula:
Air Evacuation
ADDITIONAL REFRIGERANT PER PIPE LENGTH
Connective Pipe
Length
Air Purging
Method
Additional Refrigerant (
R410A:)
Pre-charge pipe length (ft/m)
(standard pipe length x N)
Vacuum pump
N/A
More than (standard
pipe length x N) ft/m
Vacuum pump
Liquid Side: Ø 6.35 (Ø 1/4”)
(Total pipe length - standard pipe length x N) x 15 g/m
(Total pipe length - standard pipe length x N) x 0.16 oZ/ft
Liquid Side: Ø 9.52 (Ø 3/8”)
(Total pipe length - standard pipe length x N) x 30 g/m
(Total pipe length - standard pipe length x N) x 0.32 oZ/ft
Electrical safety check
Perform the electric safety check after
completing installation:
1. Insulated resistance
The insulated resistance must be more
than 2 MΩ.
2. Grounding work
After nishing the grounding work, measure
the grounding resistance by visual detection
and with a grounding resistance tester. Make
sure the grounding resistance is less than 4 Ω.
3. Electrical leakage check (performed during
test running)
During test operation after installation is
nished, the service man can use the
electroprobe and multimeter to perform
the electrical leakage check. Turn o the
unit immediately if there is leakage.
Look for a solution to the problem until
the unit operates properly.
Gas leak check
1. Soapy water method:
To check for leakage in the connecting points
of the piping, use a soft brush to apply soapy
water or a liquid neutral detergent to the
indoor or outdoor unit connections. If bubbles
come out, there is leakage.
2. Leak detector
Use the leak detector to check for leakage.
NOTE: The illustration is for explanation purposes
only. The actual order of A, B, C, D and E on the
machine may be slightly dierent from the unit
you purchased. The actual shape shape prevails.
Indoor unit
check point
Outdoor unit
check point
A, B, C, and D are points on a one-four type.
A, B, C, D, and E are points on a one-ve type.
Fig. 9.4