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31-5000723 Rev. 0
Start-Up
Preliminary and Seasonal Checks
1.
Inspect electrical wiring, both field and factory installed
for loose connections. Tighten as required.
2.
Check voltage at disconnect switch. Voltage must be
within range listed on the nameplate. If not, consult the
power company and have voltage condition corrected
before starting unit.
3.
Inspect condition of condensate traps and drain
assembly. Disassemble and clean seasonally.
Do not use this furnace if any part has been underwater.
A flood-damaged furnace is extremely dangerous.
Attempts to use the furnace can result in fire or explosion.
Immediately call a qualified service technician to inspect
the furnace and to replace all gas controls, control system
parts, and electrical parts that have been wet or to replace
the furnace, if deemed necessary.
WARNING
Danger of explosion.
Can cause injury or product or property
damage. Should the gas supply fail to shut off
or if overheating occurs, shut off the gas valve
to the furnace before shutting off the electrical
supply.
WARNING
Before attempting to perform any service or maintenance,
turn the electrical power to unit OFF at disconnect switch.
CAUTION
Heating Start-Up
BEFORE LIGHTING
the unit, smell all around the furnace
area for gas. Be sure to smell next to the floor because some
gas is heavier than air and will settle on the floor.
The gas valve on the NF97UM is equipped with a gas control
switch. Use only your hand to move the switch. Never use
tools. If the the switch will not move by hand, replace the
valve. Do not try to repair it. Force or attempted repair may
result in a fire or explosion.
Placing the Furnace into Operation
NF97UM units are equipped with an ignition system. Do NOT
attempt to manually light burners on this furnace. Each time
the thermostat calls for heat, the burners will automatically
light The ignitor does not get hot when there is no call for
heat on units with an ignition system.
Priming Condensate Trap
The condensate trap should be primed with water prior to
start-up to ensure proper condensate drainage. Either pour
10 fl. oz. (300 ml) of water into the trap, or follow these steps
to prime the trap:
1.
Follow the lighting instructions to place the unit into
operation.
2.
Set the thermostat to initiate a heating demand.
3.
Allow the burners to fire for approximately 3 minutes.
4.
Adjust the thermostat to deactivate the heating demand.
5.
Wait for the combustion air inducer to stop. Set the
thermostat to initiate a heating demand and again allow
the burners to fire for approximately 3 minutes.
6.
Adjust the thermostat to deactivate the heating demand
and again wait for the combustion air inducer to stop. At
this point, the trap should be primed with sufficient water
to ensure proper condensate drain operation.
If you do not follow these instructions exactly, a fire
or explosion may result causing property damage,
personal injury or death.
WARNING
Gas Valve Operation
GAS VALVE SHOWN IN THE ON POSITION
NEGATIVE AIR
PRESSURE PORT
POSITIVE AIR
PRESSURE PORT
MANIFOLD
PRESSURE TAP
INLET
OUTLET
SUPPLY
PRESSURE
TAP
Figure 46. Gas Valve
1.
STOP
! Read the safety information at the beginning of
this section.
2.
Set the thermostat to the lowest setting.
3.
Turn off all electrical power to the unit.
