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Refrigerant Pipe Installation
Additional Refrigerant Charging Method
(1) Loosely connect the refrigerant cylinder hose to the gauge manifold, then open the source
valve V
on the cylinder, purge the air in the hose, and then tighten the hose.
H
(2) As shown in the diagram below, turn the refrigerant cylinder upside down, open the valve
V
on the gauge manifold, and then charge the liquid side pipe with refrigerant in the
H
liquid state. (Note that with some types of refrigerant cylinders, the liquid refrigerant will be
output through siphoning action with the cylinder in the normal upright position.) If the
proper charging amount cannot be reached, close the valve V
upright, open the liquid-side and balance packed valves completely, and open the gas-side
packed valve only half way. Begin the cooling operation, open valve V
the gas-side pipe with refrigerant in the gaseous state.
(3) While watching the scales display, quickly close the valve V
has been charged with the proper amount of additional refrigerant. Then close the source
valve Va on the cylinder, and open the gas-side packed valve completely.
(4) Record the amount of additional refrigerant that was added to the system on the nameplate
inside the front panel (lower) of the outdoor unit.
Liquid pipe
Gauge manifold
pressure
4.5 5.5 7.0
Gas pipe
Refrigerant
bottle
Gas
Indoor Unit
Liquid
Va
Scales
Low
High
pressure
Service
V
V
L
H
port
Packed valve (Gas side)
Outdoor Unit
Refrigerant
gas
109
, turn the refrigerant cylinder
H
, and then charge
L
completely when the system
L
Detailed drawing of packed valve
To gauge
{
manifold
Service port
at liquid side
Packed valve
at liquid side
To main
Service port at
unit
balance side
Piping
Packed valve
at site
at balance side
To main unit
Piping at site
Service port
at gas side
Packed valve
at gas side
To main
unit
Piping
at site
17
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