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2-4. Recharging of refrigerant
Recharge, if necessary, the specified amount of new refrigerant according to the following procedure.
NOTE
• Never charge refrigerant exceeding the specified amount.
• If the specified amount of refrigerant cannot be charged, charge it a little at a time while running refrigerant
recovery (pump down).
• Do not make additional charging.
An additional charge when refrigerant leaks changes the refrigerant composition in the refrigerant cycle,
causing the characteristics change of the Air to Water Heat Pump or excessive high pressure in the refrigerant
cycle with more than the specified amount of refrigerant charged. This may cause burst or an injury.
Fig. 2-4-1 Configuration of refrigerant charging
(For refrigerant charging, see the figure below)
Recover the refrigerant, and check that no
refrigerant remains in the refrigerant cycle.
Connect the charge hose to packed valve service
port on the outdoor unit's gas side.
Connect the charge hose to the vacuum pump
adapter.
Open fully both packed valves on the liquid and
gas sides.
Open fully the handle of gauge manifold Lo, turn on the
vacuum pump, and then perform vacuum evacuating.
When the compound gauge's pointer indicates
-0.1 MPa (-76cmHg), close fully the handle Lo and turn
off the vacuum pump.
Let the equipment stay as it is for one to two minutes
and check that the compound gauge pointer does not
return.
Place the refrigerant cylinder to the electronic balance,
connect the connecting hose to the cylinder and the
connecting port of the electronic balance, and then
charge liquid refrigerant.
(Hydro unit)
(Outdoor unit)
Open
Open
Service port
Check valve
Open/close valve
for charging
Electronic balance for refrigerant charging
CloseOpen
Refrigerant cylinder (with siphon)
+00A09-002_01EN_SVM_ALL_Air_to_Water.book Page 11 Monday, October 5, 2009 2:09 PM