Datasheet

Installation 5RMI0-02A
126
Inverter Single
The air and moisture remaining in the refrigerant system have undesirable effects as indicated below.
1. Pressure in the system rises.
2 . Operating current rises.
3 . Cooling(or heating) efficiency drops.
4. Moisture in the refrigerant circuit may freeze and block capillary tubing.
5 . Water may lead to corrosion of parts in the refrigeration system.
Therefore, after evacuating the system, take a leak test for the piping and tubing between the indoor and outdoor unit.
Air purging with vacuum pump
1. Preparation
• Check that each tube(both liquid and gas side tubes) between the indoor and outdoor units have been properly
connected and all wiring for the test run has been completed. Remove the service valve caps from both the gas and
the liquid side on the outdoor unit. Note that both the liquid and the gas side service valves on the outdoor unit are
ept closed at this stage.
2. Leak test
• Connect the manifold valve(with pressure gauges) and dry nitrogen gas cylinder to this service port with charge
hoses.
Be sure to use a manifold valve for air purging. If it is not available, use a stop valve for this purpose. The knob of the 3-
way valve must always be kept close.
- Pressurize the system to maximum 17.6kg/cm2G (R-22 model) or 28.1kg/cm2G (R-410A model) with dry nitrogen gas
and close the cylinder valve when the gauge reading reaches 17.6kg/cm2G (R-22 model) or 28.1kg/cm2G (R-410A
model). Next step is leak test with liquid soap.
CAUTION
To avoid nitrogen entering the refrigerant system in a liquid state, the top of the cylinder must be higher than its bottom
when you pressurize the system. Usually, the cylinder is used in a vertical standing position.
CAUTION
There is a risk of fire and explosion. Inert gas
(nitrogen) should be used when you check plumbing
leaks, cleaning or repairs of pipes etc. If you are using
combustible gases including oxygen, product may have
the risk of fires and explosions.
CAUTION
- Do a leak test of all joints of the ubing(both indoor and
outdoor) and both gas and liquid side service valves.
Bubbles indicate a leak. Be sure to wipe off the soap with
a clean cloth.
- After the system is found to be free of leaks, relieve the
nitrogen pressure by loosening the charge hose
connector at the nitrogen cylinder. When the system
pressure is reduced to normal, disconnect the hose from
the cylinder.
Lo Hi
Indoor unit
Outdoor unit
Manifold valve
Charge hose
Nitrogen gas
cylinder(in vertical
standing position)
Pressure
gauge
Air Purging