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INSTALLATION MANUAL FOR OUTDOOR UNIT
24
(6) Additional charge of refrigerant
Outdoor unit is precharged at a factory for the piping length up to 5m. Additional charge is not required
up to 5m.
Notes (i) Basic refrigerant charge amount means refrigerant amount when refrigerant piping length is 5m.
(ii) When the refrigerant piping length exceeds the length that additional refrigerant charge is not
required, charge additional refrigerant based on to the calculated amount of refrigerant per unit
piping length.
Example of additional charge amount calculation
Calculate the additional charge amount when the piping length is 25 m.
Additional charge amount of refrigerant =0.70kg(Calculate the amount in any case.)
(25 - 5 ) x 0.06 = 1.2
Additional charge amount (kg)
Additional charge amount per 1m (kg/m)
Length that additional refrigerant charge is not required (m)
Total length of the piping (one way) (m)
Heat
pump
Length that
additional
charge is not
required
Maximum
piping
length
Additional
charge
amount
(ii)
per meter
Basic
refrigerant
charge
amount
(i)
Factory charge amount
of refrigerant
Outdoor unit Indoor unit
Item
Model
3.44
3.52 0 0.06
5m
50m
(v)
(viii)
2.32 2.40
0
0.06
5m
(vii)
(viii)
30m
HDU-24H03/H
HDU-28H03/H
HDU-42H03/H
If air perge with the refrigerant is forbidden at the local, please use the vacuum method
(Please see the below figure)
To use vacuum pump
3
Vacuumize for over 15min. And check the level gauge
which should read -0.1 MPa (-76 cm Hg) at low
pressure side. After the completion of vacuumizing,
close the handle 'Lo' in gaugemanifold and stop the
operation of the vacuum pump.
Check the condition of the scale and hold it for 1-2min.
If the scale-moves back in spite of tightening, make
flaring work again, the return to the beginning of 3 .
1
Detach the service port's cap of 3-way valve, the
valve rod's cap for 2-way valve and 3-way's, connect
the service port into the projection of charge hose
(low) for gaugemanifold. Then connect the projection
of charge hose (center) for gaugemanifold into
vacuum pump.
2
Open
3
Close
2
Open the handle at low in gaugemanifold, operate
vacuum pump. If the scale-moves of gause (low)
reach vacuum condition in a moment, check 1 again.
Vacuum pump
3-way valve
2-way valve
Gaugemanifold
Gaugemanifold
Vacuum pump
2-way valve
3-way valve