Carrier 58CTA/CTX User Manual download pdf (Page 40)

Table 14 – 2-- Stage Furnace Blower OFF delay Setup Switch

DESIRED HEATING MODE

BLOWER OFF DELAY (SEC.)

SETUP SWITCH

S W --- 2

SETUP SWITCH

S W --- 3

90 OFF OFF

120 OFF ON

150 ON OFF

180 ON ON

R Y W G

10 TURNS

THERMOSTAT SUBBASE

TERMINALS WITH

THERMOSTAT REMOVED

(ANITICIPATOR, CLOCK, ETC.,

MUST BE OUT OF CIRCUIT.)

HOOK-AROUND

AMMETER

EXAMPLE:

5.0 AMPS ON AMMETER

10 TURNS AROUND JAWS

0.5 AMPS FOR THERMOSTAT

ANTICIPATOR SETTING

FROM UNIT 24-V

CONTROL TERMINALS

A96316

Fig. 55 -- Amp. Draw Check with Ammeter

Step 4 — Check Safety Controls

The flame sensor, gas valve, and pressure switch were all checked

in the Start--up procedure section as part of normal operation.

1. Check Main Limit Switch(es)

This control shuts off combustion system and energizes

air--circulating blower motor, if furnace overheats. By us-

ing this method to check limit control, it can be established

that limit is functioning properly and will operate if there

is a restricted return--air supply or motor failure. If limit

control does not function during this test, cause must be

determined and corrected.

a. Run furnace for at least 5 minutes.

b. Gradually block off return air with a piece of cardboard

or sheet metal until the limit trips.

c. Unblock return air to permit normal circulation.

d. Burners will re--light when furnace cools down.

2. Check draft safeguard switch.

The purpose of this control is to cause the safe shutdown

of the furnace during certain blocked vent conditions.

a. Verify vent pipe is cool to the touch.

b. Disconnect power to furnace and remove vent connector

from furnace vent elbow.

c. Restore power to furnace and set room thermostat above

room temperature.

d. After normal start--up, allow furnace to operate for 2

minutes, then block vent elbow in furnace 80% of vent

area with a piece of flat sheet metal.

e. Furnace should cycleoff within 2 minutes. Ifgas doesnot

shut off within 2 minutes, determine reason draft safe-

guard switch did not function properly and correct condi-

tion.

f. Remove blockage from furnace vent elbow.

g. Switch will auto--reset when it cools.

h. Re--install vent connector.

NOTE: Should switch remain open longer than 3 minutes,

furnace control board will lockout the furnace for 3 hours. To

reset furnace control board, turn thermostat below room

temperature or from HEAT to OFF and turn 115--v power OFF,

then back ON.

3. Check Pressure Switch(es)

This control proves operation of the draft inducer blower.

a. Turn off 115--v power to furnace.

b. Disconnect inducer motor lead wires from wire harness.

c. Turn on 115--v power to furnace.

d. Set thermostat to “call for heat” and wait 1 minute. When

pressure switch is functioning properly, hot surface ig-

niter should NOT glow and control diagnostic light

flashes a status code 32. If hot surfaceigniter glows when

inducer motor is disconnected, shut down furnaceimme-

diately.

e. Determine reason pressure switch did not function prop-

erly and correct condition.

f. Turn off 115--v power to furnace.

g. Reconnect inducer motor wires, replace outer door, and

turn on 115--v power.

h. Blower will run for 90 seconds before beginning the call

for heat again.

i. Furnace should ignite normally.

Step 5 — Checklist

1. Put away tools and instruments. Clean up debris.

2. Verify that switches for LHT and OFF--DELAY are

blower OFF--DELAY are selected as desired.

3. Verify that blower and burner access doors are properly in-

stalled.

4. Cycle test furnace with room thermostat.

5. Check operation of accessories per manufacturerfs in-

structions.

6. Review User’s Guide with owner.

7. Attach literature packet to

furnace.

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Carrier 58CTA/CTX User Manual Page 40

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