-
73
-
(c)
Charging refrigerant
1) Since R410A refrigerant must be charged in the liquid phase, you should charge it, keeping the container cylinder upside
down or using a refrigerant cylinder equipped with a siphon tube.
2) Charge refrigerant always from the liquid side service port with the service valve shut. When you find it difficult to
charge a required amount, fully open the outdoor unit valves on both liquid and gas sides and charge refrigerant from the
gas (suction) side service port, while running the unit in the cooling mode. In doing so, care must be taken so that
refrigerant may be discharged from the cylinder in the liquid phase all the time. When the cylinder valve is throttled down
or a dedicated conversion tool to change liquid-phase refrigerant into mist is used to protect the compressor, however,
adjust charge conditions so that refrigerant will gasify upon entering the unit.
3) In charging refrigerant, always charge a calculated volume by using a scale to measure the charge volume.
4) When refrigerant is charged with the unit being run, complete a charge operation within 30 minutes. Running the unit
with an insufficient quantity of refrigerant for a long time can cause a compressor failure.
NOTE
Put down the refrigerant volume calculated from the pipe length onto the caution label attached on the back
side of the side cover.
(5)
Drain piping work
●
Execute drain piping by using a drain elbow and drain grommets
supplied separately as optional parts, where water drained from
the outdoor unit is a problem.
In an area where temperature drops below zero for several days in
a row, do not install a drain elbow or grommets. (Because of
freezing, drain water could be blocked from running freely.)
There are 3 drain holes provided on the bottom plate of an outdoor
unit to discharge condensed water.
When condensed water needs to be led to a drain, etc., install the
unit on a flat base (supplied separately as an optional part) or
concrete blocks.
Connect a drain elbow as shown in the illastration and close the
other two drain holes with grommets.
Grommet
Drain elbow
Drain hose(To be arranged on the user's part)
• Open the valve rod until it touches the stopper. You
need not apply lorce to push it further.
• When an operation is completed, replace the cap nut
and tighten it as before.
Open
Hexagonal Head Wrench
(M4)
Liquid/gas operation
(4)
Refrigerant quantity
(a)
This unit is shipped from the factory with the refrigerant sufficient for an installation involving 30m of
piping, and does not necessitate additional refrigerant charge as long as the pipe length is 30m or less.
(b) When the pipe length exceeds 30m but remains within 50m, add refrigerant according to the table below
(showing an additional quantity required for each meter of the pipe exceeding 30m) by metering for the
quantity determined by the actual pipe length.
(Example) When 302 model unit is used in a new installation involving 45m of piping
Additional charge quantity:0.9kg = (45-30)m
0.06kg/m
Item
302 series
Quantity charged for shipment (for 30m of piping)(kg)
2.95
Additional charge quantity per meter (kg/m)
0.06
Model
Compound pressure gauge Pressure gauge
Gauge manifold
Handle Hi
Gas service valve
Handle Lo
Liquid service valve
Charge port
-101kPa
(-755mmHg)
Charge hose
Charge hose
Vacuum
pump
Check valve
Vacuum adapter
