En-7
Unit wiring
5. 3.
When stripping off the coating of a lead wire, always use a special tool such as a wire
•
stripper. If there is no special tool available, carefully strip the coating with a knife etc.
Earth (Ground) wire
Power cable or
Connection cable
20 mm
60 mm or more
How to connect wiring to the terminal
Caution when wiring cable
Use crimp-type terminals with insulating sleeves as shown in the
fi
gure to
(1)
connect to the terminal block.
Securely clamp the crimp-type terminals to the wires using an appropriate tool
(2)
so that the wires do not come loose.
Use the speci
fi
ed wires, connect them securely, and fasten them so that there is
(3)
no stress placed on the terminals.
Use an appropriate screwdriver to tighten the terminal screws. Do not use a
(4)
screwdriver that is too small, otherwise, the screw heads may be damaged and
prevent the screws from being properly tightened.
Do not tighten the terminal screws too much, otherwise, the screws may break.
(5)
See the table below for the terminal screw tightening torques.
(6)
Strip : 10mm
Wire
Terminal blocks
Crimp-type
terminal
Sleeve
Wire
Crimp-type
terminal
Screw with
special washer
Screw with special washer
Crimp-type terminal
Tightening torque [N·m (kgf·cm)]
M4 screw
1.2 to 1.8 (12 to 18)
Connection diagrams
5. 4.
A
B
L
N
1
2
3
B
1
2
3
A
1
2
3
1
2
3
Power cable
Earth (Ground)
POWER
230V
50 Hz · 1ø
Connection cable
Connection cable
Outdoor unit
5. 5.
Switch cover removal
(1)
Remove the 6
fi
•
screws.
Lift the switch cover B
•
upward, and then pull it
outward to remove it.
Pull the switch cover A
•
outward to remove it.
Hook
Hook
Switch cover A
Switch cover B
Connect the power
(2)
supply cable and the
connection cable to
terminal.
Fasten the power
supply cable and
connection cable with
cable clamp.
1 2 3 1 2 3
L N
POWER
UNIT A
UNIT B
PVC tube
Cable clamp
Connection cable
Power cable
PVC tube
As illustrated below,
(3)
draw out the power
cable and the
connection cable.
Power cable
Connection cable
Install the switch cover
(4)
A, B.
Switch cover A
Switch cover B
PIPE INSTALLATION II
6.
Vacuum
6. 1.
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
6. 1. 1.
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 the
(2)
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 (76 cmHg), 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 (60 to 70 kgf·cm)].
Tighten the blank caps and charging port cap of the 2-way valve and 3-way valve to
(9)
the speci
fi
ed 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 the
(2)
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 speci
fi
ed pressure all at once but do so gradually.
(4)
①
Increase the pressure up to 0.5 Mpa (5 kgf/cm
2
), let it sit for about
fi
ve minutes
and then check for any decrease in pressure.
②
Increase the pressure up to 1.5 Mpa (15 kgf/cm
2
), let it sit for about
fi
ve minutes
and then check for any decrease in pressure.
③
Increase the pressure up to the speci
fi
ed pressure (the pressure designed for the
product) and then make a note of it.
Let it sit at the speci
fi
ed pressure and if there is no decrease in pressure then it is
(5)
satisfactory. If a pressure decrease is con
fi
rmed, 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)
9379342070-02_IM.indb 7
9379342070-02_IM.indb 7
2011-12-21 11:14:14
2011-12-21 11:14:14
