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C
I
OMPLETING THE
NSTALLATION
Connecting Up and Purging the Circuit
C C
A A
U U
C C
A A
U U
The air in the indoor unit and in the pipe must be purged. If air remains in the
refrigeration pipes, it will affect the compressor, reduce to cooling/heating capacity and
could lead to a malfuction. Refrigerant for air purging is not charged in the outdoor unit.
Use Vacuum Pump as shown at the right figure. Each unit must be purged in turn.
Indoor
A-unit
Indoor
B-unit
A
B
The designs and shape are subject
to change according to the model.
Valve stem
Liquid side
Gas side
Service port
Refrigerant Refill
18
E-
T T
I I
O O
N N
T T
I I
O O
N N
1
2
3
4
Vacuum Pump
5
Stem cap
6
7
If connecting pipe of more than 7.5 metres is installed, additional
refrigerant should be charged by extra metre. You don't have to
charge additional refrigerant up to 7.5 metres of connecting pipe.
When length of the pipe is over 7.5 meters by the unit, you should charge the
refrigerant according to the formulas below.
MH18AP1(P2)X, MH19AP1(P2)X, MH24AP1(P2)X
-
L
: the length of A-unit's pipe(meter)
a
-
L
: the length of B-unit's pipe & C-unit's pipe(meter)
b
α
"
"
A-unit
B/C-unit
Check the piping connections.
Connect the charging hose of low pressure side of manifold gauge to the
packed valve having a service port (3/8" service valve) as shown at the
figure.
Open the valve of the low pressure side of manifold gauge
counter-clockwise.
Purge the air from the system using vacuum pump for about 10 minutes.
- Close the valve of the low pressure side of manifold gauge clockwise.
- Make sure that pressure gauge show -0.1MPa(-76cmHg) after about
10 minutes.
This procedure is very important in order to avoid gas leak.
- Turn off the vacuum pump
- Remove the hose of the low pressure side of manifold gauge.
Set valve cork of both liquid side and gas side of packed valve to the open
position.
Mount the valve stem nuts and the service port cap to the valve, and
tighten them at the torque of 183kgf•cm with a torque wrench.
Check for gas leakage.
- At this time, especially check for gas leakage from the 3-way valve's
stem nuts, and from the service port cap.
MH26AP1(P2)X
MH18AP1(P2)X MH19AP1(P2)X MH24AP1(P2)X MH26AP1(P2)X Remarks
20
18
20
25
A-unit
α
B-unit
L
x (
- 7.5)
a
A-unit
α
L
B/C-unit
x (
- 15)
a
(Unit:g/m)
16
16
R410A
16
21
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