Carrier T--298 - Manual (Page 39)

T--298 3-15
3.7 THERMOSTAT INSTALLATION AND START--
UP INSTRUCTIONS (WALL MOUNTED)
3.7.1 Introduction
The thermostat is a wall mounted, low--voltage
thermostat which maintains room temperature by
controlling the operation of
a heating and air
conditioning system. Batteries are not required;
temperature and mode settings are preserved with the
power off.
CAUTION
Improper wiring or installation may damage
thermostat. Wiring must conform to local
and national electrical codes.
WARNING
Before installing thermostat, turn off all
power to unit. There may be more than one
power disconnect. Electrical shock can
cause personal injury or death.
3.7.2 Installation
NOTE
Read all instructions before starting the installa-
tion.
NOTE
The thermostat requires no batteries. The ther-
mostat is not a power stealing device and
MUST have both R and C connected.
3.7.3 Thermostat Location
The thermostat should be mounted:
Approximately 5 foot (1.5m) from the floor.
Close to or in a frequently used room, preferably on
an inside partitioning wall.
On a section of wall without pipes or duct work.
The thermostat should NOT be mounted:
Close to a window, or an outside wall, or next to a door
leading to the outside.
Exposed to direct light and heat from a lamp, sun, fire-
place, or other temperature--radiating object which
may cause a false reading.
Close to or in direct airflow from supply registers and
return--air grilles.
In areas with poor air circulation, such as behind a
door or in an alcove.
3.7.4 Install Thermostat -- 12VDC
a. Turn off all power to unit.
b. If an existing thermostat is being replaced:
1.Remove existing thermostat from wall.
2.Disconnect wires from existing thermostat, one at
a time. Be careful not to allow wires to fall back into
the wall.
3.As each wire is disconnected, record wire color
and terminal marking.
4.Discard or recycle old thermostat.
NOTE
Mercury is a hazardous waste and must be des-
posed of properly.
c. Seperate the front and back pieces of plastic.
d. Route thermostat wires through hole in back piece of
plastic. Level plastic against wall (for aesthetic value
only -- thermostat need not be leveled for proper op-
eration) and mark wall through 2 mounting holes.
e. Drill two 3/16 inch mounting holes in wall where
marked.
NOTE
Mounting holes on thermostat are designed to
fit on a horizontal J--Box.
f. Secure back plastic to wall with 2 anchors and screws
provided, making sure all wires extend through hole in
plastic.
g. Connect wires to proper terminal of the connector
block in the front piece of plastic.
h. Pusr any excess wire back into wall. Excess wire in-
side the thermostat plastic case can interfere with
proper air flow across the temperature sensor. Seal
hole in wall to prevent air leaks. Leaks can effect op-
eration.
i. Snap front and back pieces of plastic together.
j. Turn on power to the unit.
3.8 LCD DISPLAY
3.8.1 Cool Only Thermostat (Part No. 1110--421)
On power up, the LCD readout will display C (Cool
Only).
3.8.2 Heat/Cool Thermostat (Part No. 1110--420)
On power up, the LCD readout will display HC (Heat/
Cool).
3.9 SET THERMOSTAT CONFIGURATION
While in configuration mode, three option choices can be
made.
A -- Anticipator Value Adjustment
d -- Display Temperature Fahrenheit/Celcius Selection
oF -- Offset Adjustment For Room Temperature
3.9.1 Enter Configuration Mode
Enter and hold the FAN button for approximately 10 sec-
onds until room temperature disappears and the display
reads A. You are now in the configuration mode.