Sub-Base Installation - Trane TCONT900AC43UA Installer's Manual

INSTALLATION
When Installing this Product...
1. Read these instructions carefully. Failure to follow
these instructions can damage the product or cause
a hazardous condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.
3. Installer must be a trained, experienced service
technician.
4. After completing installation, use these instructions
to check out the product operation.
WARNING
Voltage Hazard. Can cause electrical shock or
equipment damage.
Disconnect power before beginning installation.
Location
Install the Comfort Control about 5 ft. (1.5m) above the
floor in an area with good circulation at average
temperature. See Figure 1.
NO
NO
Fig. 1. Selecting Comfort Control Location
Do not install the Comfort Control where it can be affected
by:
• drafts or dead spots behind doors and in corners.
• hot or cold air from ducts.
• radiant heat from sun or appliances.
• concealed pipes and chimneys.
• unheated (uncooled) areas such as an outside wall
behind the Comfort Control.
NO
YES
5 FEET
[1.5 METERS]

Sub-base Installation

The Comfort Control can be mounted horizontally on the
wall or on a 2 in. by 4 in. wiring box. Position sub-base
horizontally on the wall or on a 2 in. by 4 in. wiring box.
1. Turn OFF all power to heating and coolingequip-
ment.
2. If an existing Comfort Control is being replaced:
a. Remove existing Comfort Control from wall.
b. Disconnect wires from existing control, one at a
time. Be careful not to allow wires to fall back
into wall.
c. As each wire is disconnected, record wire color
and terminal marking.
d. Discard or recycle old Comfort Control.
3. Separate the Comfort Control from the subbase to
expose mounting holes.
4. Position and level the sub-base wallplate (for
appearance only). The Comfort Control functions
properly even when not level.
5. Use a pencil to mark the mounting holes.
6. Remove the sub-base from the wall and drill two
3/16 in. holes in the wall (if drywall) as marked. For
firmer material such as plaster, drill two 7/32 in.
holes. Gently tap anchors (provided) into the drilled
holes until flush with the wall.
7. Position the sub-base over the holes, pulling the
wires through the wiring opening.
8. Insert the mounting screws in the holes and tighten.
Wiring
All wiring must comply with local electrical codes and
ordinances. See Figures 2 and 3 wiring diagrams for
specific equipment applications. Refer to Table 2 for
terminal designations.
WARNING
Voltage Hazard. Can cause electrical shock or
equipment damage.
Disconnect power before beginning installation
NOTE: The maximum total cable length for the entire
Comfort Control communicating system is 500
feet 18 AWG. The maximum distance of any
single cable from a transformer is 250 feet
18 AWG.
1. Loosen the terminal screws on the sub-base. Insert
wires into the terminal block next to the loosened
screw. See Figure 4.
IMPORTANT
Use 18-gauge color-coded Comfort Control cable for
proper wiring. Shielded cable is not
typically required. Keep this wiring at least one foot away
from large inductive loads such as
Electronic Air Cleaners, motors, line starters, lighting
ballasts and large distribution panels. Failure to follow
these wiring practices may
introduce electrical interference (noise) which can cause
erratic system operation. All unused Comfort Control wire
to be grounded at indoor unit chassis ground only.
Shielded cable may be required if the above wiring
guidelines cannot be met. Ground the shield only to the
system chassis.
3
TCONT900AC43UA
Pub. No. 18-HD32D1-2
69-2079—05