Drain Piping Work - Mitsubishi Heavy Industries SRK20ZJ-S Data Book

Wrap indoor units' flare joints with heat insulating parts (pipe cover) for heat insulation (both gas and liquid pipes).
Give heat insulation to both gas and liquid side pipes. Bundle a heat insulating material and a pipe tightly together so that no gaps may be left between them and wrap them
together with a connecting cable by a dressing tape.
Both gas and liquid pipes need to be dressed with 20 mm or thicker heat insulation materials above the ceiling where relative humidity exceeds 70%.

3. DRAIN PIPING WORK

Execute drain piping by using a drain elbow and drain
grommets supplied separately as optional parts, where
water drained from the outdoor unit is a problem.
Water may drip where there is a larger amount of drain
water. Seal around the drain elbow and drain grommets
with putty or adequate caulking material.
Condensed water may flow out from vicinity of operation
valve or connected pipes.
Where you are likely to have several days of sub-zero
temperatures in a row, do not use a drain elbow and
drain grommets. (There is a risk of drain water
freezing inside and blocking the drain.)
4. ELECTRICAL WIRING WORK
Electrical installation work must be performed by an electrical installation service provider qualified by a power provider of the country.
Electrical installation work must be executed according to the technical standards and other regulations applicable to electrical installations in the country.
Do not use any supply cord lighter than one specified in parentheses for each type below.
braided cord (code designation 60245 IEC 51),
ordinary tough rubber sheathed cord (code designation 60245 IEC 53)
flat twin tinsel cord (code designation 60227 IEC 41);
Use polychloroprene sheathed flexible cord (code designation 60245 IEC57) for supply cords of parts of appliances for outdoor use.
Ground the unit. Do not connect the grounding wire to a gas pipe, water pipe, lightning rod or telephone grounding wire.
If impropery grounded, an electric shock or malfunction may result.
A grounding wire must be connected before connecting the power cable. Provide a grounding wire longer than the power cable.
The installation of an impulse withstanding type earth leakage breaker is necessary. A failure to install an earth leakage breaker can result in an
acccident such as an electric shock or a fire.
Do not turn on the power until the electrical work is completeted .
Do not use a condensive capacitor for power factor improvement under any circumstances. (It dose not improve power factor, while it can cause
an abnormal overheat accident)
For power supply cables, use conduits.
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
CAUTION
Do not put a grommet
on this hole.
This is a supplementary
drain hole to discharge
drain water, when a large
quantity of it is gathered.
Drain elbow
Drain hose
Grommet To be procured on the installer's part
For details of electrical cabling, refer to the indoor unit installation manual.
Power cable, indoor-outdoor connecting wires
Earth leakage breaker
(Harmonic resistant type)
Switchgear or Circuit breaker
1 2/N
1 2/N 3
In case of faulty wiring connection, the indoor unit stops,
and then the run lamp turns on and the timer lamp blinks.
Use cables for interconnection wiring to avoid loosening of the wires.
CENELEC code for cables Required field cables.
H05RNR4G1.5 (Example) or 245IEC57
H Harmonized cable type
05 300/500 volts
R Natural-and/or synth. rubber wire insulation
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.
Phase Model Earth leakage breaker
Outdoor unit
and outdoor units
Gas piping
Liquid piping
Insulation
When condensed water needs to be
led to a drain, etc., install the unit on
a flat base (supplied separately as an
optional part) or concrete blocks.
Then, please secure space for the drain
elbow and the drain hose.
Clearance
CAUTION
2 )
Switchgear or Circuit Breaker
Interconnecting and
Power souce
grounding wires
Switch breaker Over current protector
(minimum)
(minimum)
rated capacity
IN
Ch
Exp
Af