Recharging Of Refrigerant - Carrier 42NQV009E Service Manual

2-4. Recharging of Refrigerant

When it is necessary to recharge refrigerant, charge the specified amount of new refrigerant according to the
following steps.
Recover the refrigerant, and check no refrigerant
remains in the equipment.
Connect the charge hose to packed valve service
port at the outdoor unit's gas side.
Connect the charge hose to the vacuum pump
adapter.
Open fully both packed valves at liquid and gas
sides.
Place the handle of the gauge manifold Low in
the fully opened position, and turn on the vacuum
pump's power switch. Then, evacuating the
refrigerant in the cycle.
1 Never charge refrigerant exceeding the specified amount.
2 If the specified amount of refrigerant cannot be charged, charge refrigerant bit by bit in COOL mode.
3 Do not carry out additional charging.
When additional charging is carried out if refrigerant leaks, the refrigerant composition changes in the
refrigeration cycle, that is characteristics of the air conditioner changes, refrigerant exceeding the
specified amount is charged, and working pressure in the refrigeration cycle becomes abnormally high
pressure, and may cause a rupture or personal injury.
Refrigerant cylinder
(With siphon pipe)
Electronic balance for refrigerant charging
(INDOOR unit) (Liquid side)
(Gas side)
Check valve
Open/Close valve
for charging
Fig. 2-4-1 Configuration of refrigerant charging
– 11 –
When the compound gauge's pointer has indi-
cated -0.1 Mpa (-76 cmHg), place the handle Low
in the fully closed position, and turn off the
vacuum pump's power switch.
Keep the status as it is for 1 to 2 minutes, and
ensure that the compound gauge's pointer does
not return.
Set the refrigerant cylinder to the electronic
balance, connect the connecting hose to the
cylinder and the connecting port of the electronic
balance, and charge liquid refrigerant.
(For refrigerant charging, see the figure below.)
(OUTDOOR unit)
Opened
Closed
Service port
FILE NO. SVM-07018