Carrier Furnace owner manual Control Switch to on Replace main furnace door. See Fig

SINGLE-STAGEGAS CONTROL

MObULAT_NGGASCOm_Ot

SHOWNFN_OFF¸' PosmoN

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Fig. 11 - Control Switch to OFF

6.After waiting five minutes, turn control switch on the gas con- trol to the ON position. Turn the control switch to ON. See Fig. 12.

I GAS CONTROL SWffCH

MODULATING GAS CONTROL

SHOWN [N "ON" POSfflON

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Fig. 12 - Control Switch to ON

7. Replace main furnace door. See Fig. 13.

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Fig. 13 - Furnace Door Replaced (Upflow Configuration)

8.Turn ON the electrical supply to the furnace and wait one nfinute. See Fig. 14.

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Fig. 14 - Turn on Electrical Supply

9. Open the external manual gas valve, See Fig. 15.

it

A06189

Fig. 15 - Open Valve

10.Set the room thermostat "MODE" to "HEAT" and adjust the

set point to a temperature slightly above the room temperat-

ure. This will automatically signal the furnace to start.

11.When the furnace receives the start signal, the combustion air draft inducer is started. When the pressure switch senses that

there is sufficient combustion air, the hot surface igniter is en- ergized.

After the hot surface igniter is heated for about 20 seconds, the

gas valve pernfits gas to flow to the main burners. After igni- tion and a time delay of up to 60 sec, the furnace blower will

start. Variable-capacity furnaces start at low speed until the

control makes the necessary adjustments to operate the blower

at either the low- or high-heat speed.

NOTE: If the main burners fail to ignite after four attempts, the furnace control system will lock out. If lockout occurs, main burners fail to light, or blower does not come on, shut down the furnace and call your dealer for service.

12.Set your thermostat to the temperature that satisfies your

comfort requirements. SUGGESTION: Setting the thermo-

stat back a few degrees--and compensating for the differ-

ence with warmer clothing--can make a big difference in

your fuel consumption on extremely cold days. The few de-

grees at the top of your thermostat "comfort level" are the most costly degrees to obtain.

When the room temperature drops below the temperature selected

on the thermostat, the furnace will switch on automatically. When

the room temperature reaches the setting selected on the thermostat,

the furnace will be automatically switched off.

Continuous Fan Operation -Some thermostats have a "FAN" switch with two selections: AUTO and ON. When the them_ostat is

set on AUTO, the furnace blower cycles on and off, controlled by

the themmstat. In ON position, the furnace blower runs

continuously. Continuous fan keeps the temperature level in your

home more evenly balanced. It also continuously filters the indoor air.