Checklist - Bryant 311AAV Series 100 Installation, Start-Up, And Operating Instructions Manual

This control shuts off combustion control system and
energizes air-circulating blower motor if furnace overheats.
Recommended method of checking this limit control is to
gradually block off return air after furnace has been
operating for a period of at least 5 minutes. As soon as limit
control has shut off burners, return-air opening should be
unblocked to permit normal air circulation. By using 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.
2. Check blocked-vent safeguard switch.
The purpose of this control is to permit the safe shutdown
of the furnace during certain blocked-vent conditions.
THERMOSTAT SUBBASE
TERMINALS WITH
THERMOSTAT REMOVED
(ANITICIPATOR, CLOCK, ETC.,
MUST BE OUT OF CIRCUIT.)
R Y W G
10 TURNS
FROM UNIT 24-V
CONTROL TERMINALS
EXAMPLE: 5.0 AMPS ON AMMETER
10 TURNS AROUND JAWS
Fig. 34–Amp Draw With Ammeter
a. Disconnect power to furnace and remove vent connector
from furnace vent elbow. Be sure to allow time for vent
pipe to cool down before removing.
HOOK-AROUND
AMMETER
= 0.5 AMPS FOR THERMOSTAT
ANTICIPATOR SETTING
A96316
b. Restore power to furnace and set room thermostat above
room temperature.
c. After normal start-up, allow furnace to operate for 2
minutes, then block vent elbow in furnace 100 percent.
Furnace should cycle off within 2 minutes.
d. Remove blockage and reconnect vent pipe to furnace
vent elbow.
e. Switch will auto-reset when it cools.
3. Check Flow-Sensing Pressure Switch
This control proves operation of the draft inducer blower.
a. Turn off 115-v power to furnace.
b. Remove outer door and 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
igniter should NOT glow and control diagnostic light
flashes a status code 31. If hot surface igniter glows
when inducer motor is disconnected, shut down furnace
immediately. Determine reason pressure switch did not
function properly and correct condition.
e. Turn off 115-v power to furnace.
f. Reconnect inducer motor wires, replace outer door, and
turn on 115-v power.
VI. CHECKLIST
1. Put away tools and instruments. Clean up debris.
2. Check that HEAT blower-OFF delay jumper position is
selected as desired.
3. Verify that blower and outer access doors are properly
installed.
4. Cycle test furnace with room thermostat.
5. Check operation of accessories per manufacturer's instruc-
tions.
6. Review User's Guide with owner.
7. Leave literature packet near furnace.
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