Carrier T--298 service manual LCD Display, SET Thermostat Configuration

3.7THERMOSTAT 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.

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.

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.

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

3.8.1Cool Only Thermostat (Part No. 1110--421) On power up, the LCD readout will display C (Cool

Only).

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.

3.7.4Install Thermostat -- 12VDC a. Turn off all power to unit.

b. If an existing thermostat is being replaced: 1.Remove existing thermostat from wall.

3.8.2Heat/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.

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