Table 14 – 2-Stage Furnace Blower OFF delay Setup Switch
DESIRED HEATING MODE | SETUP SWITCH | SETUP SWITCH |
BLOWER OFF DELAY (SEC.) | ||
90 | OFF | OFF |
120 | OFF | ON |
150 | ON | OFF |
180 | ON | ON |
58CT
THERMOSTAT SUBBASE TERMINALS WITH THERMOSTAT REMOVED (ANITICIPATOR, CLOCK, ETC.,
MUST BE OUT OF CIRCUIT.)
R Y W G
10 TURNS
FROM UNIT
CONTROL TERMINALS
EXAMPLE: | 5.0 AMPS ON AMMETER | = | 0.5 AMPS FOR THERMOSTAT | |
10 TURNS AROUND JAWS | ANTICIPATOR SETTING | |||
|
|
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
1.Check Main Limit Switch(es)
This control shuts off combustion system and energizes
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
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
e.Furnace should cycle off within 2 minutes. If gas does not 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
h.
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
3.Check Pressure Switch(es)
This control proves operation of the draft inducer blower.
a.Turn off
b.Disconnect inducer motor lead wires from wire harness.
c.Turn on
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 surface igniter glows when inducer motor is disconnected, shut down furnace imme- diately.
e.Determine reason pressure switch did not function prop- erly and correct condition.
f.Turn off
g.Reconnect inducer motor wires, replace outer door, and turn on
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
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 manufacturerfs in- structions.
6.Review User’s Guide with owner.
7.Attach literature packet to furnace.
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