Carrier 140/E Series Installation, Start--Up, Operating, And Service And Maintenance page 39

Table 14 - 2-Stage Furnace Blower OFF delay Setup Switch
DESIRED HEATING MODE SETUP SWITCH SETUP SWITCH
BLOWER OFF DELAY (SEC.) SW-2 SW-3
90 OFF OFF
120 OFF ON
150 ON OFF
180 ON ON
SUBBASE
TERMINALS WITH
THERMOSTAT REMOVED
(ANITICIPATOR, CLOCK, ETC.,
MUST BE OUT OF CIRCUIT.)
AMMETER
I0 TURNS
FROM UNIT 24-V
CONTROL TERMINALS
EXAMPLE; 5.0 AMPS ON AMMETER = 0.5 AMPS FOR THERMOSTAT
10 TURNS AROUND JAWS ANTICIPATOR SETTING
A96316
Fig. 50 - 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 flmctioning properly and will operate if there
is a restricted return-air supply or motor failure. If limit
control does not flmction 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 cycle offwithin 2 minutes. If gas does not
shut off within 2 minutes, determine reason draft safe-
guard switch did not flmction 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 I 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 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 -- ChecMist
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 manufacturerDfs in-
structions.
6. Review User's Guide with owner.
7. Attach literature packet to furnace.
39