Before Starting The Test Run; Indoor Unit Accessories; Selecting An Installation Site; Securing Installation And Service Space - Mitsubishi Electric City Multi PFFY-WP20-VLRMM-E Installationshandbuch

• Use power line cables of sufficient current carrying capacity and rating.
- Cables that are too small may leak, generate heat, and cause a fire.
• Use only a circuit breaker and fuse of the specified capacity.
- A fuse or circuit breaker of a larger capacity or a steel or copper wire may
result in a general unit failure or fire.
• Do not wash the air conditioner units.
- Washing them may cause an electric shock.
• Be careful that the installation base is not damaged by long use.
- If the damage is left uncorrected, the unit may fall and cause personal in-
jury or property damage.
• Install the drain piping according to this Installation Manual to ensure
proper drainage. Wrap thermal insulation around the pipes to prevent
condensation.
- Improper drain piping may cause water leakage and damage to furniture
and other possessions.
• Be very careful about product transportation.
- Only one person should not carry the product if it weighs more than 20 kg.
- Some products use PP bands for packaging. Do not use any PP bands for
a means of transportation. It is dangerous.
- Do not touch the heat exchanger fins. Doing so may cut your fingers.
- When transporting the outdoor unit, suspend it at the specified positions
on the unit base. Also support the outdoor unit at four points so that it can-
not slip sideways.
• Safely dispose of the packing materials.
- Packing materials, such as nails and other metal or wooden parts, may
cause stabs or other injuries.
- Tear apart and throw away plastic packaging bags so that children will not
play with them. If children play with a plastic bag which was not torn apart,
they face the risk of suffocation.

2. Indoor unit accessories

The unit is provided with the following accessories:
Part No. Accessories
1 Screw plate
2 Level adjusting screw
3 Strainer
4 Drain hose
5 Hose band

3. Selecting an installation site

• Select a location so that air can be blown into all corners of the room.
• Avoid locations exposed to outside air.
• Select a location free of obstructions to the airflow in and out of the unit.
• Avoid locations exposed to steam or oil vapour.
• Avoid locations where combustible gas may leak, settle or be generated.
• Avoid installation near machines emitting high-frequency waves (high-
frequency welders, etc.).
• Avoid locations where the airflow is directed at a fire alarm sensor. (Hot air
could trigger the alarm during the heating operation.)
• Avoid places where acidic solutions are frequently handled.
• Avoid places where sulphur-based or other sprays are frequently used.
• If the unit is run for long hours at high temperature/high humidity (due point
above 23 °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.
Warning:
Ensure that the unit is installed in a place strong enough to sustain its
weight.
If there is a lack of strength, it may cause the unit to fall down, resulting in
an injury.

4. Installing the unit

4.1. Assembling the unit

1 Install the unit frame in parallel with the floor securely when installing. If the
floor is not flat, be sure to use the supplied level adjusting screws to maintain
the unit body at level.
[Fig. 4.1.1] (P.2)
A Floor hole for fixing
B Level adjusting screws (supplied)
C Screw plate (supplied)
6
Qty Place to set
4
4
Set inside the packaging
1
material
1
1

1.4. Before starting the test run

Caution:
• Turn on the power at least 12 hours before starting operation.
- Starting operation immediately after turning on the main power switch can
result in severe damage to internal parts. Keep the power switch turned on
during the operational season.
• Do not touch the switches with wet fingers.
- Touching a switch with wet fingers can cause electric shock.
• Do not operate the air conditioner with the panels and guards removed.
- Rotating, hot, or high-voltage parts can cause injuries.
• Do not turn off the power immediately after stopping operation.
- Always wait at least five minutes before turning off the power. Otherwise,
water leakage and trouble may occur.
• When water has been supplied to the water pipework, purge the system
of air. The details of air purging can be found separately in the water
circuit maintenance manual.
- Details are described in section [9] "Instructions for debris removal opera-
tion" under chapter IX Troubleshooting in the Service Handbook for the
HBC.
- Refer to Fig. 1.4.1 for the position of the air vent valve on the indoor unit.
[Fig. 1.4.1] (P.2)
A Air vent valve

3.1. Securing installation and service space

For PFFY-WP-VLRMM-E
Model name
20
25 · 32
40 · 50
[Fig. 3.1.1] (P.2)
<Upward blowing type>
A Floor
C Piping space
3.2. Combining indoor units with outdoor
units
For combining indoor units with outdoor units, refer to the outdoor unit installa-
tion manual.
Note:
There are two level adjusting screws on both sides each, a total of four.
There are the following two methods of fixing the unit for purposes of preventing
the unit from falling down. Where fixing is necessary, screw the unit at the speci-
fied position given below.
For fixing on the floor
[Fig. 4.1.2] (P.2)
<Viewed from bottom of the unit>
For fixing on the wall
[Fig. 4.1.3] (P.2)
<Viewed from front of the unit>
(C) (D)
660 More than 240
780 More than 240
1020 More than 240
B Ceiling
D Electrical part service space
(mm)