Additional Refrigerant Charging Method - Toshiba HFCR407C Service Manual

(1) Loosely connect the refrigerant cylinder hose to the gauge manifold, then open the source valve V
purge the air in the hose, and then tighten the hose.
(2) As shown in the diagram below, turn the refrigerant cylinder upside down, open the valve V
and then charge the liquid side pipe with refrigerant in the 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
liquid-side and balance packed valves completely, and open the gas-side packed valve only half way. Begin the
cooling operation, open valve V
(3) While watching the scales display, quickly close the valve V
proper amount of additional refrigerant. Then close the source valve V
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.
.5 5.5 7.0
Gas pipe
Refrigerant
bottle
Indoor unit
17
Refrigerant pipe installation

Additional refrigerant charging method

, and then charge the gas-side pipe with refrigerant in the liquid state.
L
Liquid pipe
Gauge manifold
Low High
pressure pressure
V
Service
H
port
V
L
Gas
Packed valve (gas side)
Liquid
Refrigerant
V
a
gas
Scales
, turn the refrigerant cylinder upright, open the
H
completely when the system has been charged with the
L
a
Packed valve
(liquid side)
Packed valve at
balance side
Outdoor unit
130
on the gauge manifold,
H
on the cylinder, and open the gas-side packed
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 at site
To main unit
Piping at site
on the cylinder,
H
Service port
at gas side
Packed valve
at gas side
To main
unit
Piping at site