Installation Manual
– 20 –
EN
EN-39
EN-40
Adding refrigerant
After finishing vacuuming, exchange the vacuum pump with a refrigerant canister and start additional charging of refrigerant.
Calculation of additional refrigerant charge amount
Default refrigerant amount does not include the refrigerant for pipes at the local site.
For refrigerant to be charged in pipes at the local site, calculate the amount and charge it additionally.
Table 1
Table 2
Example: (060 type)
Additional charge amount R (kg)
= ( Lx × 0.025 kg/m) + ( Ly × 0.055 kg/m) + ( 0.8 kg )
= ( 12 × 0.025 kg) + ( 28 × 0.055 kg) + ( 0.8 kg )
= 2.64 kg
Lx: Real total length of liquid pipe diameter 6.35 mm (m)
Ly: Real total length of liquid pipe diameter 9.52 mm (m)
Outdoor unit type
MHP0404
MHP0504
MHP0604
Charging amount (kg)
6.4
6.4
6.4
Additional
refrigerant charge
amount at local site
=
Real length of liquid
pipe
×
Additional refrigerant
charge amount per
1 m liquid pipe
(Table 1)
+
Compensation by
outdoor HP
(Table 2)
Liquid pipe dia. (mm)
6.35
9.52
Additional refrigerant amount /
1 m liquid pipe (kg / m)
0.025
0.055
Outdoor unit type
MHP0404
MHP0504
MHP0604
Compensation by outdoor HP (kg)
0
0.4
0.8
L1
Ø9.52: 10 m
L2
Ø9.52: 10 m
L3
Ø9.52: 5 m
L4
Ø9.52: 3 m
L5
Ø6.35: 3 m
L6
Ø6.35: 4 m
L7
Ø6.35: 5 m
L1
L2
L3
L4
L5
L6
L7
D
C
B
A
Charging of refrigerant
• Keeping the valve of the outdoor unit closed, be sure to charge the liquid refrigerant into the service port at the
liquid side.
• If the specified amount of refrigerant cannot be charged, fully open the valves of the outdoor unit at liquid and gas
sides, operate the air conditioner in COOL mode, and then charge refrigerant into service port at the gas side. In
this time, choke the refrigerant slightly by operating the valve of the canister to charge liquid refrigerant.
• The liquid refrigerant may be charged suddenly, therefore be sure to charge refrigerant gradually.
