• 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.
Example (1006 type)
L1
Ø12.7 : 10 m
L2
Ø12.7 : 10 m
L3
Ø9.5 : 5 m
L4
Ø9.5 : 5 m
L5
Ø9.5 : 5m
L6
Ø9.5 : 5 m
L7
Ø6.4 : 4m
A
MMU-AP0274HP-E
B
MMU-AP0274HP-E
C
MMU-AP0274HP-E
D
MMD-AP0096BHP-E
Additional refrigerant charge amount at site (kg) = [1] + [2] + [3]
[1]. Compensation by system HP (Table 1)
= 0.
4
kg
[2]. Corrective amount of refrigerant depending on the indoor units (Table 2)
= a + b + c + d
= 0.4 + 0.4 + 0.4 + 0.2
= 1.4kg
a: Corrective amount of refrigerant depending on the indoor unit A (kg)
b: Corrective amount of refrigerant depending on the indoor unit B (kg)
c: Corrective amount of refrigerant depending on the indoor unit C (kg)
d: Corrective amount of refrigerant depending on the indoor unit D (kg)
[3]. Real length of liquid pipe × Additional refrigerant charge amount per liquid pipe 1m (Table 3)
= (La × 0.025 kg/m) + (Lb × 0.055 kg/m) + (Lc × 0.105 kg/m)
= (4 m × 0.025 kg/m) + (20 m × 0.055 kg/m) + (20 m × 0.105 kg/m)
= 3.3 kg
La: Real length of liquid pipe Ø6.4 (m) = L7
Lb: Real length of liquid pipe Ø9.5 (m) = L3 + L4 + L5 + L6
Lc: Real length of liquid pipe Ø12.7 (m) = L1 + L2
Additional refrigerant charge amount at site = [1] + [2] + [3] = 0.
4
+ 1.4 + 3.3 = 5.
1
kg
Charging of refrigerant
•
•
L1
L2
L3
L4
L5
L6
L7
B
A
C
D
- 20 -
