Indoor Unit Accessories; Selecting An Installation Site; Install The Indoor Unit On A Ceiling Strong Enough To Sustain Its Weight; Securing Installation And Service Space - Mitsubishi Electric City Multi PEFY-WP20 Installation Manual

2. Indoor unit accessories

The unit is provided with the following accessories:
Part No.
1 Insulation pipe
2 Tie band
3 Drain hose
4 Washer

3. Selecting an installation site

• Select a site with sturdy fixed surface sufficiently durable against the weight
of unit.
• Before installing unit, the routing to carry in unit to the installation site should
be determined.
• Select a site where the unit is not affected by entering air.
• Select a site where the flow of supply and return air is not blocked.
• Select a site where refrigerant piping can easily be led to the outside.
• Select a site which allows the supply air to be distributed fully in room.
• Do not install unit at a site with oil splashing or steam in much quantity.
• Do not install unit at a site where combustible gas may generate, flow in,
stagnate or leak.
• Do not install unit at a site where equipment generating high frequency
waves (a high frequency wave welder for example) is provided.
• Do not install unit at a site where fire detector is located at the supply air side. (Fire
detector may operate erroneously due to the heated air supplied during heating
operation.)
• When special chemical product may scatter around such as site chemical
plants and hospitals, full investigation is required before installing unit. (The
plastic components may be damaged depending on the chemical product
applied.)
• If the unit is run for long hours when the air above the ceiling is at high tem-
perature/high humidity (due point above 26 °C), due condensation may be
produced in the indoor unit. When operating the units in this condition, add
insulation material (10-20 mm) to the entire surface of the indoor unit to avoid
due condensation.
3.1. Install the indoor unit on a ceiling strong
enough to sustain its weight
Warning:
The unit must be securely installed on a structure that can sustain its weight.
If the unit is mounted on an unstable structure, it may fall down causing inju-
ries.
10
Accessories Qty
1
3
1
8

3.2. Securing installation and service space

Secure enough access space to allow for the maintenance, inspection, and repla-
cement of the motor, fan, drain pump, heat exchanger, and electric box in one of
the following ways.
Select an installation site for the indoor unit so that its maintenance access space
will not be obstructed by beams or other objects.
(1) When a space of 300 mm or more is available below the unit between the
unit and the ceiling (Fig. 3.2.1)
• Create access door 1 and 2 (450 x 450 mm each) as shown in Fig. 3.2.2.
(Access door 2 is not required if enough space is available below the unit for
a maintenance worker to work in.)
(2) When a space of less than 300 mm is available below the unit between the
unit and the ceiling (At least 20 mm of space should be left below the unit as
shown in Fig. 3.2.3.)
• Create access door 1 diagonally below the electric box and access door 3
below the unit as shown in Fig. 3.2.4.
or
• Create access door 4 below the electric box and the unit as shown in Fig. 3.2.5.
[Fig. 3.2.1] (P.3)
[Fig. 3.2.2] (Viewed from the direction of the arrow A) (P.3)
[Fig. 3.2.3] (P.3)
[Fig. 3.2.4] (Viewed from the direction of the arrow B) (P.3)
[Fig. 3.2.5] (Viewed from the direction of the arrow B) (P.3)
A Electric box
C Ceiling beam
E Access door 1 (450 mm x 450 mm)
G Supply air
I Bottom of indoor unit
K Access door 4
3.3. Combining indoor units with outdoor
units
For combining indoor units with outdoor units, refer to the outdoor unit installation
manual.
B Ceiling
D Access door 2 (450 mm x 450 mm)
F Maintenance access space
H Intake air
J Access door 3