IM 955-3 / Page 3 of 6
Pre-Installation
Inspection
Visually inspect the carton for damages. If it is damaged,
notify the appropriate carrier immediately.
Open the carton and visually inspect the device for obvious
defects. Return damaged or defective products.
Required Installation Items:
• Wiring diagram for MicroTech III Unit Controller
Tools
■ Appropriate screwdriver(s) for cover, terminals, and
mounting screws
■ Wire stripper/cutter
The following only if wallboard mounting:
■ Appropriate drill and drill bits
■ Appropriate mounting screws and plastic anchors
Wiring
3-lead NEC Class II low voltage wiring for temperature sen
-
sor 669529001, 5-lead for sensor 669529101 and 669529201.
Notes:
1. Do not install the wire cables in the same conduit
with power wiring.
2. Never apply external voltage of any type to any
terminal or damage will result.
3. Do not exceed ratings of the device. This is a low
voltage device:
4. Always use 22-gauge wire and never locate the
room temperature sensor more than 250' from the
unit:
Wiring must be installed in accordance with the National
Electrical Code and all local codes and ordinances, which can
require the use of plenum rated cable or conduit.
Mounting Location
Locate the sensor on a wall where exposure to unrestricted air
circulation represents the average temperature of the space. A
common mistake is to mount the sensor too close to the sup
-
ply air diffuser in a room. This causes short cycling of the air
conditioning unit and large room temperature swings.
Installation
DANGER
Hazardous Voltage!
This equipment presents hazards of electricity.
Failure to read and follow these instructions can re
-
sult in property damage, severe personal injury or
death.
1. Turn off power at the main service panel by removing the
fuse or switching the appropriate circuit breaker to the
OFF position.
2. Remove the sensor cover by inserting a screwdriver and
gently twisting it in the slots on the sides of the wall
temperature sensor (669529101 & 669529201 only).
To remove the cover on sensor 669529001, loosen two
allen-wrench set screws located on the underside of the
cover.
Note:
Mount the sensor five feet above the floor. Do not
mount the sensor on an outside wall, in direct sunlight,
behind a door, or in an area affected by a vent or duct.
3. Place the wall sensor mounting base against the wall
where the sensor where be located. Using the base as a
template trace the mounting holes onto the wall.
4. Drill a 3/16" hole at each mounting hole mark.
5. Insert wall anchors into mounting holes and tap in to the
wall surface.
6. Feed wires through the back of the sensor mounting base
and align sensor mounting holes with wall anchors.
7. Use supplied screws to secure sensor base to wall.
CAUTION
Be certain that exposed portions of wires do not come in contact
with each other.
8. Connect stripped, labeled wires to matching terminals on
the temperature sensor. Refer to either
Figure 1
or
Figure
2 on page 4
for wiring details.
9. Tighten screws on terminal connections. Gently tug wire
to check for secure connections. Confirm that each wire
is connected to the proper terminal.
10. Seal the hole where the wire enters through the wall
behind the temperature sensor, with non-flammable
insulation or putty.
11. Replace cover on wall temperature sensor by snapping it
in place.
12. Turn on power to the system at the main service panel
13. Test wall temperature sensor operation as described in
"Testing" on page 4.
Note:
Sensor 669529001 has two allen wrench set-screws
on the underside of the sensor cover to secure it in
place. Do not overtighten.
