How To Install - Mitsubishi Electric PAR-21MAA Installation Manual

3 How To Install

1. Choose a place in which to install the remote controller (switch box).
Be sure to observe the following steps:
(1) Temperature sensors are provided with both the remote controller and the indoor units. When using the
remote controller temperature sensor, the master remote controller detects the room temperature. Install
the master remote controller in a place where the average room temperature can be detected and which
is not affected by any heat source from direct sunlight or air blown from air conditioning units.
CAUTION The place where (when) the difference between the room temperature and the wall tem-
perature is large, the wall temperature that is affected by the temperature of the wall on
which the remote controller is installed is measured. Therefore, the difference between
the room temperature and the measured wall temperature may be large.
When the installation site is one of the followings, use of a temperature sensor for an
indoor unit is recommended.
- When the room is not well-ventilated and the air does not reach the wall on which the
remote controller is installed.
- When the difference between the temperature of the wall on which the remote con-
troller is installed and the room temperature.
- When the backside of the wall on which the remote controller is installed is exposed
to the outdoor air.
When the temperature changes drastically, the temperature may not be measured accu-
rately.
When a remote controller temperature sensor is used in a place which is likely to be affected by the wall on which the remote controller is
installed, use of an optional spacer (Model: PAC-YT83RS) for a remote controller is recommended.
(For how to set the main and sub remote controller, see step (1) "Remote controller" [4]-3. (1) in section
For how to set the temperature sensor, see step (2) "Unit function selection" in section 6 Function Selection .)
(2) When installing on either the switch box or the wall, allow extra space around the remote controller as shown in the figure at the right.
NOTE: Make sure that there is no wiring or wire near the remote controller sensor. If there is, the remote controller cannot detect the exact room
temperature.
(3) Parts which must be supplied on site.
• Switch box for two units
• Thin-copper wiring pipe
• Lock nut and bushing
• Surface raceways
2. Seal the remote controller cord with putty in order to prevent the possible entry of dew, water droplets, cockroaches, other insects, etc.
When using the switch box
• When installing on the switch box, seal
the connections between the switch box
and wiring pipe with putty.
Wiring pipe
Wall
Bushing
Remote control
cord
3. Remove the remote controller cover.
• Insert a minus screwdriver into one of the open slots and move the screwdriver in the arrow direction.
CAUTION Do not turn the screwdriver in the slot. Doing so may damage the slot.
4. Install the lower case on the switch box or directly on the wall.
When using the switch box
Switch box for two units
Seal the remote control cord
lead-in hole with putty.
(See 2 above)
When installing directly on the wall
• When opening a hole using a drill for the remote controller cord (or when taking the cord
out of the back of the remote controller), seal the hole with putty.
• When routing the cord via the portion cut off from the upper cover, similarly seal that
portion with putty.
• When taking the remote controller cord from back of the controller, use surface race-
ways.
Lock nut
Switch box
Seal around here
with putty.
For taking cord
out from back of
remote
controller
Remote control cord
(See 5 below)
30 30
15 or less
46
102
Remote control cord
Seal around here
with putty.
Cross recessed pan
head screw
Extra space
External size
around remote
of remote
controller
controller
30 mm
30 mm
120 mm
6 Function Selection .
10
7 20
10
Switch box two units
44
Use surface
raceways
For taking cord out of top of
remote controller
When installing directly on the wall
Remote control cord
(See 5 below)
Wood screw
30 mm
Temperature
sensor
2