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Perform the following procedures to collect the refrigerant when moving the
indoor unit or the outdoor unit.
1
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2
Connect the low pressure side of the gauge manifold to the service port of
the gas side stop valve.
3
Close the liquid stop valve.
4
Supply power (circuit breaker).
* Start-up of the indoor-outdoor communication takes about 3 minutes after
the power (circuit breaker) is turned on. Start the pump-down operation 3 to
4 minutes after the power (circuit breaker) is turned ON.
5
Perform the test run for cooling operation (SW3-1: ON and SW3-2: OFF).
The compressor (outdoor unit) and ventilators (indoor and outdoor units)
start operating and test run for cooling operation begins. After the cooling
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outdoor service switch SW2-4 (pump down switch) from OFF to ON.
* Do not continue to operate for a long time with the switch SW2-4 set to ON.
Make sure to switch it to OFF after pump down is completed.
* Only set the SW3-1 to ON if the unit is stopped. However, even if the
unit is stopped and the SW3-1 is set to ON less than 3 minutes after the
compressor stops, refrigerant collecting operation cannot be performed.
Wait until the compressor has been stopped for 3 minutes and then set the
SW3-1 to ON again.
6
Fully close the gas stop valve when the pressure reading on the gauge
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2
).
7
Stop the air conditioner operation (SW3-1: OFF). Set the outdoor service
switch SW2-4 from ON to OFF.
8
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* If too much refrigerant has been added to the air conditioner system, the
pressure may not drop to 0.05 MPa (0.5 kgf/cm
2
). If this occurs, use a
refrigerant collecting device to collect all of the refrigerant in the system,
and then recharge the system with the correct amount of refrigerant after
the indoor and outdoor units have been relocated.
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the unit is shipped from the factory. Therefore, charge each refrigerant piping
system with additional refrigerant at the installation site. In addition, in order to
carry out service, enter the size and length of each liquid pipe and additional
refrigerant charge amounts in the spaces provided on the “Refrigerant amount”
plate on the outdoor unit.
*
When the unit is stopped, charge the unit with the additional refrigerant through
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vacuumized.
When the unit is operating, add refrigerant to the gas check valve using a
safety charger. Do not add liquid refrigerant directly to the check valve.
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•
Calculate the additional charge using the liquid pipe size and length of the
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•
Calculate the additional refrigerant charge using the procedure shown to the
right, and charge with the additional refrigerant.
•
For amounts less than 0.1 kg, round up the calculated additional refrigerant
charge.
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kg.)
•
The amount of additional refrigerant which is calculated from the total
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over 22.8 kg.
(Refer to the manual on the website for the capacity of indoor units and the
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This unit uses R410A-type refrigerant.
•
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conventional refrigerant because the design pressure in systems using
R410A is higher. Refer to the Data Book for more information.
•
Some of the tools and equipment used for installation with systems that use
other types of refrigerant cannot be used with the systems using R410A.
Refer to the Data Book for more information.
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Pipe size
Liquid pipe
+
Pipe size
Liquid pipe
+
Pipe size
Liquid pipe
+
Total capacity of con-
nected indoor units
Amount for the
indoor units
ø6.35
ø9.52
ø12.7
– 16.0 kW
2.5 kg
(m) × 19.0 (g/m)
(m) × 50.0 (g/m)
(m) × 92.0 (g/m)
16.1 kW – 27.0 kW
3.0 kg
27.1 kW – 31.0 kW
3.5 kg
31.1 kW – 34.0 kW
4.0 kg
34.1 kW – 36.5 kW
4.5 kg
36.6 kW – 39.0 kW
5.0 kg
39.1 kW – 41.0 kW
5.5 kg
41.1 kW –
6.1 kg
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Model name
Included refrigerant amount
PUMY-P250YBM
9.3 kg
PUMY-P300YBM
([DPSOH!
Outdoor model: PUMY-P250YBM
A : ø9.52 30 m
Indoor 1: P63 (7.1 kW)
a : ø9.52 15 m
2: P63 (7.1 kW)
b : ø9.52 10 m
3: P63 (7.1 kW)
c : ø9.52 10 m
4: P63 (7.1 kW)
d : ø9.52 10 m
5: P40 (4.5 kW)
e : ø6.35 15 m
The total length of each liquid line is as follows:
ø9.52 : A + a + b + c + d = 75 m
ø6.35 : e = 15 m
The total capacity of connected indoor unit is as follows:
7.1 + 7.1 + 7.1 + 7.1 + 4.5 = 32.9 (kW)
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Additional refrigerant charge
75 ×
50.0
+ 15 ×
19.0
+ 4.0 = 8.1 kg (rounded up)
1000
1000
At the
conditions
below:
