Mitsubishi Heavy Industries SRK60ZSX-S Technical Manual page 34

6. PUMP DOWN
(1) Connect charge hose of gauge manifold to service port of outdoor unit.
(2) Close the liquid service valve with hexagonal wrench key.
(3) Fully open the gas service valve with hexagonal wrench key.
(4) Carry out forced cooling operation (For forced cooling operation procedure, refer to indoor unit installation
manual).
(5) When the low pressure gauge becomes 0.01MPa, close the gas service valve and stop forced cooling
operation.
7. ELECTRICAL WIRING WORK
WARNING
• Make sure that all the electrical work is carried out in accordance with the national or regional
electrical standards.
• Make sure that the earth leakage breaker and circuit breaker of appropriate capacities are installed
(Refer to the table given below).
• Do not turn on the power until the electrical work is completed.
• Do not use a condensive capacitor for power factor improvement under any circumstances.
(It does not improve power factor. Moreover, it can cause an abnormal overheat accident).
Breaker specifications
Model Phase
SRC20/25/35
Single phase
SRC40/50/60
Main fuse specification
Model Specification
SRC20/25/35 250V 15A
SRC40/50/60 250V 20A
1.Preparing cable
(1) Selecting cable
Select the power source cable and connecting cable in accordance with the specifications mentioned below.
(a) Power source cable
3-core* 2.0mm 2 or more, conformed with 60245 IEC57
When selecting the power source cable length, make sure that voltage drop is less than 2%.
If the wire length gets longer, increase the wire diameter.
(b) Connecting cable
2
4-core* 1.5mm , conformed with 60245 IEC57
* 1 Earth wire is included (Yellow/Green).
(2) Arrange each wire length as shown below.
Make sure that each wire is stripped 10mm from the end.
<Power source cable>
30mm or more
40mm or more
Earth wire
Earth wire
(3) Attach round crimp-type terminal to each wire as shown in the below.
Select the size of round crimp-type terminal after considering the specifications of terminal block and wire
diameter.
10mm
CAUTION
Power source cable and connecting cable must conform to the specifications mentioned in the manual.
Using cables with wrong specifications may result in unit malfunction.
8. FINISHING WORK
1. Heating and condensation prevention
(1) Dress the connecting pipes (both liquid and gas pipes) with insulation to prevent it from heating
and dew condensation.
Use the heat insulating material which can withstand 120°C or higher temperature. Make sure that
insulation is wrapped tightly around the pipes and no gap is left between them.
(2) Wrap the refrigerant pipings of indoor unit with indoor unit heat insulation using tape.
(3) Cover the flare-connected joints (indoor side) with the indoor unit heat insulation and wrap it with
an insulation pad (standard accessory provided with indoor unit).
(4) Wrap the connecting pipes, connecting cable and drain hose with the tape.
(2) (3)
Tape
Position it so that the slit area faces upward.
NOTE
Locations where relative humidity exceeds 70%, both liquid and gas pipes need to be dressed with 20mm or
thicker heat insulation materials.
CAUTION
• Improper insulation can cause condensate(water) formation during cooling operation.
Condensate can leak or drip causing damage to household property.
• Poor heat insulating capacity can cause pipe outer surface to reach high temperature during heating
operation. It can cause cable deterioration and personal injury.
9. INSTALLATION TEST CHECK POINTS
After finishing the installation work, check the following points again before turning on the power.
Conduct test run (Refer to indoor unit installation manual) and ensure that the unit operates properly.
Power source voltage complies with the rated voltage of air-conditioner.
Earth leakage breaker and circuit breaker are installed.
Power cable and connecting cable are securely fixed to the terminal block.
Both liquid and gas service valves are fully open.
Earth leakage breaker Circuit breaker
Leakage current: 30mA, Over current: 16A
Over current: 20A
0.1sec or less
Parts No. Code on LABEL,WIRING
SSA564A136 F4
SSA564A136A F4
<Connecting cable> <Wire end>
30mm or more
10mm
40mm or more
Round crimp-type terminal
Sleeve
(4)
Insulation pad Connecting cable
Liquid pipe
Drain hose
2.Connecting cable
(1) Remove the service cover.
(2) Connect the cables according to the instructions and figures given below.
(a) Connect the earth wire of power source cable.
An earth wire must be connected before connecting the other wires of power source cable.
Keep the earth wire longer than the remaining two wires of power source cable.
(b) Connect the remaining two wires (N and L) of power source cable.
(c) Connect the wires of connecting cable. Make sure that for each wire, outdoor and indoor side
terminal numbers match.
(3) Fasten the cables properly with cable clamps so that no external force may work on terminal connec-
tions.
Moreover, make sure that cables do not touch the piping, etc. When cables are connected, make sure
that all electrical components within the electrical component box are free of loose connector coupling
or terminal connection.
<Circuit diagram>
Power
source
cable
<SRC20/25/35>
Connecting
cable
2.Finishing work
(1) Make sure that the exterior portion of connecting pipes, connecting cable and drain hose is wrapped
properly with tape. Shape the connecting pipes to match with the contours of the pipe assembly route.
(2) Fix the pipe assembly with the wall using clamps and screws. Pipe assembly should be anchored
every 1.5m or less to isolate the vibration.
(3) Install the service cover securely. Water may enter the unit if service cover is not installed properly,
resulting in unit malfunction and failure.
Gas pipe
Tape
Insulation
CAUTION
Make sure that the connecting pipes do not touch the components within the unit. If pipes touch the
internal components, it may generate abnormal sounds and/or vibrations.
No gas leaks from the joints of the service valves.
Indoor and outdoor side pipe joints have been insulated.
Drain hose (if installed) is fixed properly.
Screw of the service cover is tightened properly.
33
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'17 • SRK-T-203
Gauge manifold
Service port
Charge hose
Outdoor unit
1 2/N 3
N L
Connecting cable
Circuit
breaker
Earth
Earth
leakage
breaker
1 2/N 3
Indoor unit
Power
source
<SRC40/50/60>
Cable clamp
Power
source
cable
Pipe assembly
Screw
Clamp
Connecting
cable