Idiomas disponibles
Idiomas disponibles
Vacuum drying
Before and during installation, do NOT turn on the power until vacuuming and refrigerant charging are
completed.
Be sure to perform vacuuming from both liquid and (HP/LP, Suction) gas side.
Be sure to use a vacuum pump equipped with the counter-flow prevention function so that oil in the pump will
not flow back into piping for air conditioners. (If oil in the vacuum pump enters in the air conditioner with R410A
refrigerant, a problem may be caused in the refrigerating cycle.)
After finishing the airtight test and discharging nitrogen gas, connect the gauge manifold to the service ports of the
liquid side and (HP/LP, Suction) gas side and connect a vacuum pump as shown in the figure below. Be sure to
perform vacuuming for the liquid and (HP/LP, Suction) gas pipe sides.
To gauge
manifold
Liquid-side
Service
service port
port of HP/
Liquid-side
LP gas
valve
side
To outdoor
unit
To
outdoor
Piping at site
HP/LP
unit
gas side
valve
Piping at site
Service port of suction gas side
Ball valve of suction gas side
Use a vacuum pump with a high vacuuming degree [-100.7 kPa (5 Torr, -755 mmHg)] and large exhaust gas
amount (40 L/minute or larger).
Perform vacuuming for 2 or 3 hours, though the time differs depending on the pipe length. Check that all the
packed valves at the liquid side and (HP/LP, Suction) gas side are fully closed.
If the pressure does not reach -100.7 kPa or less, continue vacuuming for 1 hour or more. If the pressure does
not reach -100.7 kPa after 3 hours of vacuuming, stop vacuuming and check for air leakage.
If the pressure reaches -100.7 kPa or less after vacuuming for 2 hours or more, close the valves VL and VH on
the gauge manifold fully and stop the vacuum pump. Leave it as it is for 1 hour to confirm that the vacuuming
degree does not change.
If the degree of vacuum loss is large, moisture may remain in the pipes. In that case, inject dry nitrogen gas and
apply pressure to 0.05 MPa and perform vacuuming again.
After finishing the above procedure of vacuuming, exchange the vacuum pump with a refrigerant canister and
advance to the additional charging of refrigerant.
33-EN
Low pressure
Connected to
Suction gas side valve
indoor unit
fully closed
Valve details
Main
Header outdoor unit
piping
Brazed
To outdoor unit
Service port
copper pipe
Brazed
Service port
HP/LP gas side valve
fully closed
Brazed
Service port
Liquid side valve fully closed
Piping at site
– 17 –
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
Refrigerant charge amount at shipment from the factory 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.
NOTE
If the additional refrigerant amount indicates minus as the result of calculation, use the air conditioner without
additional refrigerant.
Standard model
High pressure
gauge
gauge
MMY-
Gauge
v
v
v
H
Amount of refrigerant
manifold
charged in factory
High heat model
MMY-
P
Vacuum pump
Amount of refrigerant
charged in factory
Calculationg the additional amount of refi gerant
Additional amount of refrigerant charge at site = [1] + [2] × [A] + [3] + [4]
[1] Additional amount of refrigerant based on the outdoor unit capacity type. (Table 1-1,1-2)
[2] Additional amount of refrigerant based on the liquid pipe diameter and length.
Real length of liquid pipe × Additional amount of refrigerant charge per liquid pip length 1 ft and 1 m. (Table 2)
[A] Correction factor based on the indoor unit connection capacity. (Table A)
[3] Additional amount of refrigerant based on the indoor unit capacity type and number. (Table 3-1, 3-2, 3-3, 3-4)
[4] Refrigerant amount adjustment based on the indoor unit connection capacity. (Table 4)
MUP***1FT6P-UL
072 type
096 type
MUP***1FT9P-UL
lbs
13.2
kg
6.0
MUP***H1FT6PUL
072 type
096 type
MUP***H1FT9PUL
lbs
13.2
19.8
kg
6.0
9.0
120 type
144 type
168 type
192 type
19.8
9.0
120 type
34-EN
