Mitsubishi Electric R410A Operating And Installation Instructions page 51

Installation instructions
3. Installation of outdoor unit
Connection between indoor and outdoor unit
Connect the wires from the indoor unit to the terminal block
·
correctly.
Take care not to enable the wires to contact pipe.
·
Unscrew terminal screws
Groduing
Terminal block
Don't make wrong connection. The air conditioner can't operate
·
normally in case of wrong connection.
Tighten the screws to avoid looseness.
·
Pull the wires slightly to verify whether they are tightened.
·
Be sure to use this wire clip to fix
indoor/outdoor unit's connection wire
in good order.
A
Fixed screw
Fix the service board of outdoor unit well. Otherwise, fire and electric shock
may result from entry of dust and moisture.
The mounting surface of the air conditioner should be solid enough
·
to bear the weight. The bearing capacity shall not be lower than
actually born weight (at least 200kg/m2).
The mounting surface is decorated with wooden, metallic or non-
·
metallic structure. Corresponding measures like reinforcement,
support and anti-vibration shall be taken in case of insufficient
strength.
Installation rack shall be such a fixture that the air conditioner can
·
be fixed securely on the mounting surface.
Confirm the diameter and depth of the mounting hole for the fixture
·
based on hardness of the mounting surface material, select applicable
expansion bolt to ensure unit's stability, firmness and reliability.
·
Try to avoid rainy days, windy and snowy days as well as thundery
days during installation. If necessary, relevant measures shall be
taken to protect people from injury.
Line
Note
Note
Note
4.Complete indoor/outdoor unit connection and perform
test run
4-1 Piping connection
Indoor unit piping
①
Connect liquid and gas pipes to the unit.
First, align with the center, tighten the pipe nut with hand until you
·
can't proceed.
Refer to the following torque table, use two wrenches to tighten the
·
indoor unit side connection pipe connector. Take care not to tighten
it excessively to avoid damaging the flared part.
Pipe diameter Torque tightened
mm Inch N
·
6.35 1/4 13.7-17.7
12.7 1/2 49.0-56.4
!
When installing the unit, securely connect the refrigerant pipes
·
before starting the compressor.
Outdoor unit connection
②
As the same connection with that of indoor unit, connect the pipe to
the outdoor unit stop valve (two or three-way) pipe connector.
Tighten the connector with the same torque as that of indoor unit by
·
torque wrench or common wrench.
Heat insulation and wrapping band
Pipes and valves connected at side of indoor unit should be heat
①
insulated.
All pipes starting from the outdoor unit's pipe entrance shall be wrapped
②
with band .
E
Fix the end of band with tape.
· E
If the pipe goes through ceiling, toilet or other locations with high
·
temperature and high humidity, please wrap the pipe with commercially
available heat insulated band to avoid condensation.
4-2 Vacuumizing and leak detection test
Connect the refrigerant pipe(liquidnd gas) between the indoor and out door unit
Remove the stop valve;s service cap at the gas.pipe of outdoor unit
(Vacuumizing can't be done without removing the cap)
When vacuum pump is recommended to be used
Connect the manifold valve with gauge and vacuum pump to the stop valve's service
port at the gas pipe of outdoor unit
Run the vacuum pump(vacuumize the pipe over 15 minutes)
Check the vacuum with the manifold valve with gauge, close the valve and stop the pump.
Vacuum pump
Connection
pipe
Remove the manifold valve with gauge from the stop valve service port quickly.
Open all the stop valves at liquid and gas pipes, or performance reduction or failure may result.
It's unnecessary to add refrigerant if pipe
length is within the scope.
Screw the service cap securely.
Screw the caps of two stop valves securely.
Make a leakage detection test.
50
kgf cm
m
·
140-180
500-575
WARNING
Vacuumizing
Stop valvev
Liquid pipe
hexagon
wrench
Gas pipe
Cap
Stop valve
Service port
Manifold valve
with gauge
It's necessary to add proper refrigerant
if pipe length exceeds the scops