Determination of division work
Preparation of contract drawings
Sleeve and insert work
Installation of indoor unit
Refrigerant piping work
Drain pipe work
Heat insulation work
(connection circuits and drive circuits)
Additional charge of refrigerant
Fit facing panels
Automatic addressing of indoor unit
Test run adjustment
Transfer to customer with explanation
• The above list indicates the order in which the individual work operations are normally car-
ried out but this order may be varied where local conditions warrants such change.
• The thickness of the piping should comply with the relevant local and national regulations
for the designed pressure 3.8Mpa(551.1psi).
• Since R410A is a mixed refrigerant, the required additional refrigerant must be charged in
its liquid state.(If the refrigerant is charged in its gaseous state, its composition changes
and the system will not work properly.)
Indicate clearly who will be responsible for switch setting.
Make connection clearly between outdoor, indoor, remote controller and option.
Take account of gradient
of drain piping
Check model name to make
sure the ﬁtting is made correctly
Special attention to dryness,
cleanness and tightness
Adjust to downward gradient
Make sure airﬂow is sufﬁcient
Make sure no gaps are left where
the insulating materials are joined
Multiple core cable must not be used.
(suitable cable should be selected)
In the ﬁnal check for 24hours at 3.8 MPa(38.7 kgf/cm
The vacuum pump used must have a capacity of reaching at least 5 torr, more than 1 hour
Recharge correctly as calculated in this manual. and record the amount of added refrigerant
Make sure there are no gaps left between the facing materials used on the ceiling
Refer to automatic addressing ﬂowchart
Preheat the crank case with the electrical heater for more than 6 hours.
Run each indoor unit in turn to make sure the pipe work has been ﬁtted correctly
Explain the use of the system as clearly as possible to your customer and make sure all relevant
documentation is in order
The foundation must be level even
Outdoor unit foundation work
Avoid short circuits and ensure
Installation of outdoor unit
sufﬁcient space is allowed for service
) there must be no drop in pressure.