8
A
B
C
D
WARNING:
When installing or moving the unit, do not mix anything other than specified refrigerant (R410A) into
the refrigerating cycle.
If air is mixed, it may cause the refrigerating cycle to get abnormally high temperature, causing a risk of
burst.
Tightening torque
N·m
kgf·cm
Cap for service port
13.7 to 17.7
140 to 180
Cap for stop valve
19.6 to 29.4
200 to 300
5-5
EARTHING WORK
Put the earth circuit to the ground in accordance with “Technical Standards for Electrical Installation”.
CAUTION:
Do not connect the earth cable to any gas pipe, water pipe, lightening rod or telephone earth cable.
If there is some deficiency in earthing work, it may cause a risk of electric shock.
The product incorporates a frequency inverter and so requires earthing in order to observe electric charge and
noise caused by static electricity.
5-6
CHECKING AFTER INSTALLATION
After finishing the installation, check the following items again by marking .
Have special circuits been provided?
Is power supply voltage as specified?
Has indoor/outdoor connecting wire been inserted into terminal block?
Has indoor/outdoor connecting wire been secured firmly?
Has intermediary connection between power cable and indoor/outdoor connecting wire been carried out?
Is combination of connection pipes and indoor/outdoor connecting wire correct (Room A, Room B, Room C,
Room D)?
Is earth cable connection correct?
Has leak test been carried out?
Has air purge been carried out?
Is stop valve fully open?
Has drain discharge been checked?
Is insulation over connection pipe joints correct?
Is strength of installation location well enough?
Have all of
WARNING and
CAUTION items in “1. THE FOLLOWING SHOULD ALWAYS BE OB-
SERVED FOR SAFETY” been checked?
5-7
GAS CHARGE
Perform gas charge to unit.
1
Connect gas cylinder to the service port of stop valve.
2
Perform air purge of the pipe (or hose) coming from refrigerant gas cylinder.
3
Replenish specified amount of the refrigerant, while operating the air conditioner for cooling.
Note:
In case of adding refrigerant, comply with the quantity specified for the refrigerating cycle.
CAUTION:
For additional charging, charge the refrigerant from liquid phase of the gas cylinder. If the refrigerant is
charged from the gas phase, composition change may occur in the refrigerant inside the cylinder and
the outdoor unit. In this case, ability of the refrigerating cycle decreases or normal operation can be
impossible. However, charging the liquid refrigerant all at once may cause the compressor to be locked.
Thus, charge the refrigerant slowly.
To maintain the high pressure of the gas cylinder, warm the gas cylinder with warm water (under 40°C) during
cold season. But never use naked fire or steam.
Indoor
unit
Union
Stop valve
Outdoor
unit
Union
Gauge manifold
valve (for R410A)
Charge hose (for R410A)
Refrigerant gas
cylinder
operating valve
(for R410A)
Refrigerant gas cylinder
for R410A with siphon
Refrigerant (liquid)
Electronic scale for
refrigerant charging
Liquid pipe
Gas pipe
Union
Stop valve with
service port
Union
5-8
TEST RUN
• Be sure to perform the test run for each unit. Make sure each indoor unit operates properly following the
installation manual attached to the unit.
• If you perform the test run for all indoor units at once, you cannot detect any erroneous connection, if any, of
the refrigerant pipes and the indoor/outdoor unit connecting wires.
About the restart protective mechanism
Once the compressor stops, the restart preventive device operates so the compressor will not operate for 3
minutes to protect the air conditioner.
5-9
EXPLANATION TO THE CUSTOMER
• Recommend the customer to read the OPERATING INSTRUCTIONS carefully.
• Using the OPERATING INSTRUCTIONS for each unit, explain the following to the customer, how to control
temperature, how to remove the air filters, how to remove or put the remote controller in the remote controller
holder, how to clean, precautions for operation, etc.
If the customer (user) is absent, explain to the purchaser (owner, building’s controller, etc) about those
points.
(MXZ-A32WV)
