Table of Contents
Advertisement
Vaccuming, Charging & Refrigerant Handling
5.2 Refrigerant Handling
Caution:
•
Special Precautions When Dealing with Refrigerant R410A Unit
5.2.1 Components
•
Mixture of composition by weight : R32(50%) and R125(50%)
5.2.2 Characteristic
•
R410A liquid and vapor components have different compositions when the fluid evaporates or condenses.
Hence, when leak occurs and only vapor leaks out, the composition of the refrigerant mixture left in
the system will change and subsequently affect the system performance. DO NOT add new refrigerant to
leaked system. It is recommended that the system be evacuated thoroughly beforerecharging with R410A.
•
When refrigerant R410A is used, the composition will differ depending on whether it is in gaseous or
liquid phase. Hence when charging , ensure that only liquid is being withdrawn from the cylinder or can.
This is to make certain that only original composition of R410A is being charged into the system.
•
POE oil is used as lubricant for R410A compressor,
Extra precaution must be taken to avoid exposing the R410A system to moist air.
5.2.3 Handling and Installation Guidelines
•
All precautionary measures; such as ensuring no moisture, no dirt or chips in the system, clean brazing
using nitrogen, and thorough leak check and vacuuming are equally important requirements. However,
due to its hydroscopic POE oil, additional precautions must be taken to ensure optimum and trouble-free
system operation.
•
During installation or servicing, avoid prolong exposure of the internal part of the refrigerant system to
moist air. Residual POE oil in the piping and components can absorb moisture from the air
•
Ensure that the compressor is not expose to open air for more than the recommended time specified by
its manufacturer (typically less than 10 minutes). Removed the seal-plugs only when the compressor is
about to be brazed.
•
When charging R410A, ensure that only liquid is being withdrawn from the cylinder or can. This is to
ensure that only the original composition of R410A is being delivered into the system. The liquid
composition can be different from the vapor composition.
Electric Wiring
Caution:
• Field-installed wirings must comply with local codes and regulations. Voltage tolerance should be kept
at rated voltage ±10%.
• Check if the main power supply matches the nameplate rating before installation takes place.
• Each air-conditioning unit should be installed with independent circuit breaker (Field installed)
• Unit must be properly GROUNDED.
• Entire unit wiring diagram.
a
b
PE
h
c
e
Note:
75/100 c
a
b
PE
c
h
d
g
f
Power supply
a.
b.
Circuit Breaker (field supply)
c.
Power supply wiring for unit
d.
indoor unit
e.
outdoor unit
Wired remote controller
f.
g.
Unit interconnecting wire
h.
Earth
6
Advertisement
Table of Contents
