Mitsubishi SCM40ZJ-S Service Manual page 173

4 AIR PURGING
NOTE : Fully open the operation valves (on both liquid and gas sides) after completing air purging.
Since the system uses service ports differing in diameter from those found
on the conventional models, a charge hose (for R22) presently in use is not
applicable. Please use one designed specifically for R410A.
Remove the cap on both gas and liquid sides before starting operation.
After completing the operation, do not forget to tighten the cap (gas may leak).
Procedure
(1) Secure all flare nuts on both indoor and outdoor sides to
prevent leaks from the pipes.
(2) Connect the operation valves, charge hose, manifold
valve and vacuum pump as shown in the right figure.
(3) Fully open the handle Lo for the manifold valve, and
pump a vacuum for 15 minutes. Ensure that the meter
is indicating -0.1MPa (-76cmHg).
(4) After vacuuming, fully open the operation valve (both
liquid and gas sides) with a hexagon wrench.
Open
(5) Remove the charge hose from service port.
(6) Repeat the above steps (1) ~ (5) for all connected indoor units.
(7) Ensure that there are no gas leaks from the joints in the indoor and outdoor units.
5 HEAT INSULATION FOR JOINTS
Heat insulation for joints
Vinyl
Position so
tape
the slit
comes on top.
Finish and fixing
Pipe clamp
Pipes
Exterior tape
Crossover wires
Drain hose
Tapping screw
BEWARE OF WRONG CONNECTIONS IN
7
REFRIGERANT PIPING AND WIRING
Make sure to match the piping and wiring from each unit to the
outdoor unit.
Be careful because if connections are wrong, normal operation
cannot be achieved and may damage the compressor.
[Correct connections]
Piping
Indoor unit
Wiring
unit F
unit E
F
E
unit D
D Outdoor
unit
C
unit C
B
A
unit B
unit A
EARTHING WORK
Earth work shall be carried out without fail in order to prevent electric
shock and noise generation.
The connection of the earth cable to the following substances causes
dangerous failures, therefore it shall never be done. (City water pipe,
Town gas pipe, TV antenna, lightning conductor, telephoneline, etc.)
Open
Cover the joint with
insulation material
for the indoor unit
and tape it.
Apply exterior tape and
shape along the place
where the pipes will be
routed. Secure to the wall
with a pipe clamp. Be
careful not to damage the
pipes and the wires.
[Example of wrong connections]
Indoor unit
unit F
unit E
F
E
unit D
D Outdoor
unit
C
unit C
B
A
unit B
unit A
Please use an anti-reverse flow type vacuum pump adapter so as to prevent
vacuum pump oil from running back into the system. Oil running back into
an air-conditioning system may cause the refrigerant cycle to break down.
Conduct air purging for all connected indoor units.
Operation Valve
(two-way valve)
Operation valve
for room F
Operation valve
for room E
Operation valve
for room D
Check joint
Operation valve
for room C
Operation valve
Securely tighten the operation valve cap and the check joint blind nut after adjustment.
for room B
Operation valve size
Operation valve
(mm)
for room A
6.35 (1/4")
9.52 (3/8")
12.7 (1/2")
15.88 (5/8")
6 TEST RUN AND HANDLING INSTRUCTIONS
Installation test check points
Check the following points again after completion of the installation, and before
turning on the power.
Conduct a test run again and ensure that the unit operates properly.
At the same time, explain to the customer how to use the unit and how to take
care of the unit following the installation manual.
If the compressor does not operate after the operation has started, wait for 5-10
minutes. (This may be due to delayed start.)
(Three-minutes restart preventive timer)
When the air conditioner is restarted or when changing the operation, the unit will
not start operating for approximately 3minutes. This is to protect the unit and it is
not a malfunction.
After installation
The power supply voltage is correct as the rating.
No gas leaks from the joints of the operation valve.
Power cables and crossover wires are securely fixed to the terminal board.
Each indoor and outdoor unit is properly connected (no wrong wiring or piping).
Operation valve is fully open.
Refrigerant has been additionally charged (when the total pipe length exceeds
the refrigerant charged pipe length).
The pipe joints for indoor and outdoor pipes have been insulated.
Earthing work has been conducted properly.
The screw of the service panel is tightened securely.
Test run
Air conditioning and heating are normal.
No abnormal noise.
Water drains smoothly.
Protective functions are not working.
Operation of the unit has been explained to the customer.
The remote control is normal.
Operation of indicator lamps
INDICATION LAMP
LED 1
SELF DIAGNOSIS FUNCTION BY LED E
1 TIME FLASH
2 TIME FLASH
4 TIME FLASH
5 TIME FLASH
6 TIME FLASH
8 TIME FLASH
LIGHT ON
FOUR SEC LIGHT
AND
FOUR SEC OFF
172
- -
'11 • SCM-SM-110
Compound pressure gauge
Operation Valve
Pressure gauge
Cap
Gauge Manifold
-0.1MPa
(Designed specifically for R410A)
(-76cmHg)
Handle Lo Handle Hi.
Operation Valve
Charge hose
(three-way valve) (Designed specifically for R410A)
Vacuum pump adapter
Operation Valve
(Anti-reverse flow type)
Cap
(Designed specifically for R410A)
Vacuum pump
Charge hose
(Designed specifically for R410A)
Operation valve cap
Check joint blind nut
tightening torque (N·m)
tightening torque (N·m)
20 30
10 12
25 35
30 40
COLOR
RED WARNING LAMP
CURRENT CUT
TROUBLE OF OUTDOOR UNIT
TRANSMISSION ERROR IN OUTDOOR UNIT PCB
OVER HEAT OF COMPRESSOR
ERROR OF SIGNAL TRANSMISSION
SENSOR ERROR (EXCEPT DISCHARGE PIPE SENSOR)
OUTDOOR FAN MOTOR ERROR
DISCHARGE PIPE SENSOR ERROR
RPC012A918
FUNCTION
C