Checklist - Carrier 58UHV Installation, Start-Up, And Operating Instructions Manual

has shut off burners, the return-air opening should be un-
blocked. By using this method to check the limit control, it can
be established that the limit is functioning properly and will
operate, if there is a motor failure.
2. Check draft safeguard switch.
The purpose of this control is to cause safe shutdown of the
furnace during certain blocked vent conditions.
a. Disconnect power to furnace and remove vent connector
from furnace flue collar. Be sure to allow time for vent
connector pipe to cool down before removing.
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
5.0 AMPS ON AMMETER
EXAMPLE:
10 TURNS AROUND JAWS
Fig. 20—Amp Draw Check With Ammeter
b. Restore power to furnace and set room thermostat above
room temperature.
HOOK-AROUND
AMMETER
0.5 AMPS FOR THERMOSTAT
=
ANTICIPATOR SETTING
A96316
c. After normal start-up, allow furnace to operate for 2
minutes, then block flue outlet 100 percent. Furnace should
cycle off within 2 minutes.
d. Remove blockage and reconnect vent connector to furnace
flue collar.
e. Wait 5 minutes and then reset draft safeguard switch.
3. Check flow-sensing pressure switches.
This control proves operation of draft-inducer blower.
a. Turn off 115-v power to furnace.
b. Remove gas control door and disconnect inducer motor
leads from wire harness.
c. Turn on 115-v power to furnace.
→
d. Close thermostat switch as if making normal furnace start.
If hot surface igniter does not glow within several minutes
and control flashes code 32, then flow-sensing switches are
functioning properly. If hot surface igniter glows when
inducer motor is disconnected, shut down furnace imme-
diately. 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 gas control door,
and turn on 115-v power.

CHECKLIST

1. Put away tools and instruments, and clean up debris.
2. Check SW-1 through SW-4 after completing installation to
ensure desired settings for thermostat type (SW-1 and SW-2)
and blower-off delay (SW-3 and SW-4). Refer to Tables 6 and
7.
3. Verify manual reset switches have continuity.
4. Ensure blower and gas control access doors are properly
installed.
5. Cycle-test furnace with room thermostat.
6. Check operation of accessories per manufacturer's instruc-
tions.
7. Review User's Manual with owner.
8. Leave literature packet near furnace.
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