After Installation - Mitsubishi Heavy Industries SRK20ZJ-S Data Book

Do not lay electronic control cables (remote control and signaling wires) and other cables together outside the unit. Laying them together can result
in the malfunctioning or a failure of the unit due to electric noises.
Fasten cables so that may 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 and then attach the cover securely. (Improper cover attachment can result in malfunctioning or a failure of the unit, if water
penetrates into the box.)
Always use a three-core cable for an indoor-outdoor connecting cable. Never use a shield cable.
Power supply terminal block
Cable clamp
It holds cables in place and protect the terminal
connection from external force.
This clamp is for the cable in the outside
diameter 9~15mm.
Please adjust it when not suitable.
Cable name plate
It has stuck on the lid of a control box.
Grounding terminal
Please be sure to carry out D-type (type III)
grounding work.
Indoor - Outdoor
Power cable
connecting wire
power cable, indoor - outdoor connecting wire circuit diagram
INSTALLATION TEST CHECK POINTS
Check the following points again after completion of the installation, and before turnig on the power. Conduct a test run again and ensure that the unit operates properly.
Explain to the customer how to use the unit and how to take care of the unit following the instruction manual.

After installation

Power cables and connecting wires are securely fixed to the terminal block.
The power supply voltage is correct as the rating.
The drain hose is fixed securely.
Operational valve is fully open.
No gas leaks from the joints of the operational valve.
Power cable, indoor-outdoor connecting wires
Earth leakage breaker
(Harmonic resistant type)
Switchgear or Circuit breaker
1 2/N
1 2/N 3
1 2/N 3
CAUTION
Please connect the earthed line of indoor and outdoor
connecting wire to a bracket part of the illustration
The pipe joints for indoor and outdoor pipes have been insulated.
The reverse flow check cap is attached.
The cover of the pipe cover (A) faces downward to prevent rain from entering.
Gaps are properly sealed between the pipe covers (A) (B) and the wall surface / pipes.
N Polychloroprene rubber conductors insulation
R Stranded core
4or5 Number of conductors
G One conductor of the cable is the earth conductor
(yellow/green)
1.5 Section of copper wire (mm
Always perform grounding system installation work with the power cord unplugged.
Always use an earth leakage circuit breaker designed for inverter circuits to
CAUTION
prevent a faulty operation.
Earth leakage breaker
Phase Model
Outdoor unit
20
15A,30mA,
Single-phase 25
0.1sec or less
Indoor unit
35
The specifications shown in the above table are for units without heaters. For units with heaters, refer to
the installation instructions or the construction instructions of the indoor unit.
Switchgear or Circuit breaker capacity which is calculated from MAX. over current should be chosen along the
regulations in each country.
The cable specifications are based on the assumption that a metal or plastic conduit is used with no more than
three cables contained in a conduit and a voltage drop is 2%. For an installation falling outside of these
conditions, please follow the internal cabling regulations. Adapt it to the regulation in effect in each country.
2 )
Switchgear or Circuit Breaker
Interconnecting and
Power souce
grounding wires
Switch breaker Over current protector
(minimum)
(minimum)
rated capacity
1.5
30A 16A 2.0
2 mm
mm
×4
2