30
VENTING NOTES FOR FIGURES 28 -- 40
1. For co mmon vent, v ent con nector sizing and vent mater ial: United States----u se the NFGC.
2. Immediately increase to 5-- inch (127 mm) or 6-- inch (152 mm) vent connector outside furnace casing when 5 -- inch (127 mm) vent connector is required, refer to Note 1
above.
3. Side outlet vent for upflow and downflow installations must use Type B vent immediately after exiting th e furnace, except when factory--au thorized, Downflow Vent
Guard Kit, is used in the downflow position. See Product Data Sheet for accessory listing.
4. Type -- B vent where required, refer to Note 1 above.
5. Four--inch single --wall (26 ga. min.) vent m ust be used inside f urnace casing and when the Downflow Vent Guard Kit is used external to the fu r nace. See Product Data
Sheet for accessory listing.
6. Factory--auth orized accessory Downflow Ven t Guard Kit required in d ownflow installations with lower v ent co nfiguration. See Prod uct Data Sh eet for accessory listing.
7. Chimney Adapter Kit may be required for exterior masonry chimney applications. Refer to Chimney Adapter Kit for sizing and complete application details. See
Product Data Sheet for accessory listing.
8. Secure v ent con nector to furnace elbo w with (2) corro sion-- resistant sheet metal screws, spaced approximately 180_ apart.
9. Secure all other single wall vent con nector joints with (3) corr osion resistant screws spaced appro ximately 120_ apart. Secure Type--B vent conn ecto r s per vent connector
manufacturer’s recommendations.
STAR T--UP, ADJUSTMENT, AND SAFETY
CHECK
General
FIRE HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
This furnace is equipped with manual reset limit switches in
the gas control area. The switches open and shut off power
to the gas valve if a flame rollout or overheating condition
occurs in the gas control area. DO NOT bypass the
switches. Correct inadequate combustion air supply
problem before resetting the switches.
!
WARNING
CUT HAZARD
Failure to follow this caution may result in personal injury .
Sheet metal parts may have sharp edges or burrs. Use care
and wear appropriate protective clothing, safety glasses and
gloves when handling parts and servicing furnaces.
CAUTION
!
1. Maintain 115-- v wiring and ground. Improper polarity will
result in rapid flashing LED and no furnace operation.
2. Make thermostat wire connections at the 24--v terminal
block on the furnace control. Failure to make proper con-
nections will result in improper operation. (See Fig. 25.)
3. Gas supply pressure to the furnace must be greater than
4.5--In. W.C. (0.16 psig ) but not exceed 14--In. W.C. (0.5
psig).
4. Check all manual-- reset switches for continuity.
5. Install blower compartment door. Door must be in place to
operate furnace.
6. Replace outer door.
Start -- Up Procedur
es
FIRE AND EXPLOSION HAZARD
Failure to follow this warning could cause personal injury,
death and/or property damage.
Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifically for
the detection of leaks to check all connections.
!
WARNING
1. Purge gas lines after all connections have been made.
2. Check gas lines for leaks.
3. To Begin Component Self--Test:
Remove blower access door. Disconnect the thermostat R
lead from the furnace control board. Manually close the
blower door switch closed. Short (jumper) the COM -- 24v
terminal on control to the TEST/TWIN 3/16--inch quick
connect terminal on control until LED goes out (approx-
imately 2 sec). Gas valve and humidifier will not be turned
on. (See Fig. 24.)
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury, or death.
Blower access door switch opens 115--v power to control.
No component operation can occur unless switch is closed.
Caution must be taken when manually closing this switch
for service purposes.
!
WARNING
NOTE: The furnace control allows all components, except the
gas valve, to be run for short period of time. This feature helps
diagnose a system problem in case of a component failure.
Component test feature will not operate if any thermostat signal is
present at the control.
Component test sequence is as follows:
Refer to service label attached to furnace or see Fig. 44.
a. LED will display previous status code 4 times.
b. Inducer motor starts and continues to run until Step f of
component test sequence.
c. Hot surface igniter is energized for 15 sec., then off.
d. Blower motor operates on HEAT speed for 10 sec.
e. Blower motor operates on COOL speed for 10 sec.
f. Inducer motor stops.
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