En-10
24 type
Power cord
UNIT C connection cord
UNIT B connection cord
UNIT A connection cord
18 type
Power cord
UNIT B connection cord
UNIT A connection cord
(5)Be sure to seal the holes when applying the putty.
Place the cords side by side. (Do not overlap the cords.)
(6)Put the service cover and valve cover back after completion of the work.
PIPE INSTALLATION - 2
21
Vacuum
21 11
CAUTION
Always use a vacuum pump to purge the air.
Refrigerant for purging the air is not charged in the outdoor unit at the factory.
Refrigerant must not be discharged into atmosphere.
Use a vacuum pump, gauge manifold and charge hose for R410A exclusively. Using
the same vacuum for different refrigerants may damage the vacuum pump or the unit.
After connecting the piping, check the joints for gas leakage with gas leak detector or
soapy water.
Checking gas leakage and purging air
21 11 11
Gas leak checks are performed using either vacuum or nitrogen gas, so select the
proper one depending on the situation.
Checking gas leaks with vacuum:
Check if the piping connections are secure.
(
1
)
Remove the cap of 3-way valve, and connect the gauge manifold charge hoses to
(
2
)
the charging port of the 3-way valve.
Open the valve of the gauge manifold fully.
(
3
)
Operate the vacuum pump and start pump down.
(
4
)
Check that the compound pressure gauge reads -0.1 MPa (-14.7 psi), operate the
(
5
)
vacuum pump for 30 minutes or more in each valve.
At the end of pump down, close the valve of the gauge manifold fully and stop the
(
6
)
vacuum pump.
(It checks that leave as it is for about 10 minutes, and a needle does not return.)
Disconnect the charge hose from the 3-way valve charging port.
(
7
)
Remove the blank caps, and fully open the spindles of the 2-way and 3-way valves
(
8
)
with a hexagon wrench.
[torque: 6 to 7 N
.
m (53 to 62 lbf·in)].
Tighten the blank caps and charging port cap of the 2-way valve and 3-way valve to
(
9
)
the specified torque.
Checking gas leaks with nitrogen gas:
Check if the piping connections are secure.
(
1
)
Remove the cap of 3-way valve, and connect the gauge manifold charge hoses to
(
2
)
the charging port of the 3-way valve.
Pressurize with nitrogen gas using the 3-way valve charging port.
(
3
)
Do not pressurize up to the specified pressure all at once but do so gradually.
(
4
)
1
Increase the pressure up to 0.5 MPa (73 psi), let it sit for about 5 minutes and
then check for any decrease in pressure.
2
Increase the pressure up to 1.5 MPa (218 psi), let it sit for about 5 minutes
and then check for any decrease in pressure.
3
Increase the pressure up to the specified pressure (the pressure designed for the
product) and then make a note of it.
Let it sit at the specified pressure and if there is no decrease in pressure then it is
(
5
)
satisfactory. If a pressure decrease is confirmed, there is a leak, so it is necessary to
specify the leak location and make minor adjustments.
Discharge the nitrogen gas and starting removing the gas with a vacuum pump.
(
6
)
Open the valve of the gauge manifold fully.
(
7
)
Operate the vacuum pump and start pump down.
(
8
)
Check that the compound pressure gauge reads -0.1 MPa (-14.7 psi), operate the
(
9
)
vacuum pump for 30 minutes or more in each valve.
At the end of pump down, close the valve of the gauge manifold fully and stop the
(
1
0)
vacuum pump.
Disconnect the charge hose from the 3-way valve charging port.
(
11
)
Remove the blank caps, and fully open the spindles of the 2-way and 3-way valves
(
12
)
with a hexagon wrench.
[torque: 6 to 7 N
.
m (53 to 62 lbf·in)].
Tighten the blank caps and charging port cap of the 2-way valve and 3-way valve to
(
13
)
the specified torque.
Flare nut [mm (in1)]
Tightening torque [N·m (lbf·in1)]
Blank cap
6.35 (1/4)
20 to 25 (177 to 221)
9.52 (3/8)
20 to 25 (177 to 221)
12.70 (1/2)
28 to 32 (248 to 283)
15.88 (5/8)
30 to 35 (288 to 310)
19.05 (3/4)
35 to 40 (310 to 354)
Charging port cap
10 to 12 (89 to 106)
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