Installation Of Outdoor Unit; Installation - Mitsubishi FDCVA302HENR Manual

1.5.3 Installation of outdoor unit

Special instructions for R410A air conditioning systems
● Use only R410A refrigerant. R410A refrigerant is operated at about 1.6 times as high pressure as the conventional refrigerant
is.
● Air conditioning systems using R410A are equipped with different-diameter outdoor unit service valve charge ports and
check joints provided in the units so as to prevent wrong refrigerant from being charged by mistake. To achieve higher
strength resistible to refrigerant pressure, the dimensions of flaring and the across-the-flats measurement of a flare nut have
been changed for refrigerant piping. Therefore, please arrange dedicated R410A tools as listed in the table shown on the
below before you set to installation or service work.
● Do not use a charge cylinder. The use of a charge cylinder will cause the refrigerant composition to change, resulting in
performance degradation falling short of the rated capacity.
● In charging refrigerant, always take out refrigerant from a cylinder in the liquid phase.

(1) Installation

(a) In selecting an installation location, please pay attention to the following conditions and obtain the
customer's consent.
1) The place where the foundation can bear the weight of Outdoor unit.
2) The place where there is no concern about leakage of combustible gas.
3) The place where it is not stuffy.
4) The place where free from thermal radiation of other thermal source.
5) The place where flow of drain is allowed.
6) The place where noise and hot air blast do not trouble neighboring houses.
7) The place where there is no obstruction of wind at the air inlet port and air outlet port.
8) A place where it is not subject to strict rules regulating electrical noises.
9) A place at least 5m away from a TV or radio set. (If electrical noises interfere with such an instrument, move it further
away from it)
10) When the unit is installed at the particular location as shown below, corrosion or failure may be caused. Please consult
the dealer from which you purchased the air-conditioner.
a) The place where corrosive gas is generated (hot spring, etc.).
b) The place where wind containing salt blows (seaside area).
c) The place where enveloped by oil mist.
d) The place where there is a machine that radiates electromagnetic wave.
e) A place where inverter-equipped equipment, a captive generator, high-frequency medical equipment, wireless com-
munication equipment or other equipment generating electromagnetic waves is installed.
(b) The minimum space for installation
Select the space considering the direction of refrigerant piping.
Requ¡Restrict the height of obstruction wall in front of the air outlet port to the height of unit or less.
Requ¡Do not enclose around the unit by the obstruction. Secure the top space for 1 m or more.
Requ¡When more than one unit are installed side by side, provide a 250mm or wider interval between them as a service
space. In order to facilitate servicing of controllers, please provide a sufficient space between units so that their top
plates can be removed easily.
Requ¡When installing the unit where there is a concern about the short circuit, attach the guide louver in front of air outlet
port to prevent the short circuit.
Requ¡When installing plural units in a group, secure sufficient intake space to prevent the short circuit.
Requ¡When installing the unit where it is covered by snow, provide appropriate snow break means.
Dedicated R410 tools
a Gauge manifold
b
Charge hose
c Electronic scale for refrigerant charging
d
Torque wrench
e Flare tool
f
Protrusion control copper pipe gauge
g Vacuum pump adapter
h Gas leak sensor
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