Specifications

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55
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(3) Air purge
1 Tighten all flare nuts in the pipings both indoor and outside wall so as not to cause leak.
2 Connect service valve, charge hose, manifold valve and vacuum pump as is illustrated below.
3 Open manifold valve handle Lo to its full width, and perform vacuum or evacuation.
Continue the vacuum or evacuation operation for 15 minutes or more and check to see that the vacuum gauge reads – 0.1
MPa (– 76 cmHg).
4 After completing vacuum operation, fully open service valve (Both gas and liquid sides) with hexagon headed wrench.
5 Check for possible leakage of gas in the connection parts of both indoor and outdoor.
♦ Additional refrigerant charge
5.4 Connection of refrigerant pipings
(1) Preparation
Keep the openings of the pipes covered with tapes etc. to prevent dust, sand, etc. from entering them.
Manifold
Valve
-76 cm Hg
Handle Lo
(pressure)
Charge hose
Stop valve
(Two-way valve)
Service port
Stop valve
(Three-way
valve)
Compound
(Gauge)
Pressure
gauge
Handle Hi
(pressure)
Charge hose
Vacuum pump
¡ Remove the flared nuts.
(on both liquid and gas sides)
¡ Remove the flared nuts.
(on both liquid and gas sides)
¡ Install the removed flared nuts to the pipes to be con-
nected, then flare the pipes.
Dimension A
Liquid side
(f6.35): 9-9.5 dia
Gas side
(f9.52): 13.2-14 dia
(f12.7): 16.2-17 dia
Press
Remove
Remove
(Do not
turn)
1 Indoor unit side 2 Outdoor unit side
¡ Specified torquing value:
Liquid side (ø6.35) : 15.7~19.6N·m (1.6~2kgf·m)
Gas side (ø9.52) : 29.4~39.2N·m (3.0~4.0kgf·m)
(ø12.7) : 39.2~49N·m (4.0~5.0kgf·m)
¡ Use one more spanner to fix the valve.
¡ Specified torquing value:
Liquid side (ø6.35) : 15.7~19.6N·m (1.6~2kgf·m)
Gas side (ø9.52) : 29.4~39.2N·m (3.0~4.0kgf·m)
(ø12.7) : 39.2~49N·m (4.0~5.0kgf·m)
1 Indoor unit side 2 Outdoor unit side
¡ Connect firmly gas and liquid side
pipings by Torque wrench.
¡ Connect firmly gas and liquid side
pipings by Torque wrench.
¡ Always use a Torque wrench and back up spanner to tighten the flare nut.
(2) Connection of refrigerant piping
¡ 06, 07, 09 type
When refrigerant piping exceeds 7.5m conduct additional refrigerant charge after refrigerant sweeping.
7.5m over 10m:Additional charge amount per meter = 10g/m
10m over 15m:Additional charge amount per meter=30g/m
[Example]
How much amount of additional charge for 15m piping?
(10 – 7.5)m × 10g/m+(15-10)m×30g/m=175g 175g for additional charge
Spanner
for fixing
the piping)
Torque
wrench
When refrigerant piping exceeds 10m conduct additional refrigerant charge after refrigerant sweeping.
Additional charge amount per meter = 20g/m
[Example]
How much amount of additional charge for 15m piping?
(15 – 10)m × 20g/m = 100g 100g for additional charge
¡ 12 type