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→ Fig. 48—Rounded End of Knockout
→ Fig. 49—Knockout Pulled Loose
→ Fig. 50—Hammer and Screwdriver Used for
Knockout
→ Fig. 51—Remove Knockout with Hammer
START-UP, ADJUSTMENT, AND SAFETY CHECK
A04128
Step 1—General
FIRE HAZARD
Failure to follow this warning could result in a fire and lead
to property damage, personal injury or death.
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.
CUT HAZARD
A04129
Personal injury may result from sharp metal edges, etc. Be
careful when removing parts. Gloves and safety glasses
should be worn when servicing furnaces.
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 connections
will result in improper operation. (See Fig. 25.)
3. Gas supply pressure to the furnace must be greater than 4.5-in.
wc (0.16 psig ) but not exceed 14-in. wc (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.
Step 2—Start-Up Procedures
A04130
FIRE AND EXPLOSION HAZARD
Failure to follow this warning could cause property damage,
personal injury, or death.
Never purge a gas line into a combustion chamber. Never use
matches, candles, flame, or other sources of ignition for the
purpose of checking leakage. Use a soap-and-water solution
to check for leakage.
1. Purge gas lines after all connections have been made.
2. Check gas lines for leaks.
33
A04131
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