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I-SCE (09-18) PN207697R9
Place the Owner’s Envelope containing the Limited Warranty Card, this booklet, and any optional information in
an accessible location near the heater. Follow the instructions on the envelope.
⚠ DANGER ⚠
• The gas burner in this gas-fired equipment is designed and equipped to provide safe, controlled,
complete combustion. However, if the installation does not permit the burner to receive the
proper supply of combustion air, complete combustion may not occur. The result is incomplete
combustion, which produces carbon monoxide, a poisonous gas that can cause death.
• Safe operation of separated-combustion, indirect-fired gas burning equipment requires a sealed,
properly-operating vent system that vents all flue products to the outside atmosphere. FAILURE
TO PROVIDE PROPER VENTING WILL RESULT IN A HEALTH HAZARD THAT COULD CAUSE
SERIOUS PERSONAL INJURY OR DEATH.
• Install either the horizontal (see Figure 15) or vertical (see Figure 17) combustion air/vent system
using the concentric adapter supplied. Always comply with the combustion air requirements in
the installation codes and instructions.
• Combustion air at the burner should be regulated only by manufacturer-provided equipment.
NEVER RESTRICT OR OTHERWISE ALTER THE SUPPLY OF COMBUSTION AIR TO ANY HEATER.
CHECK THE COMBUSTION AIR/VENT SYSTEM FOR SOUNDNESS AND FUNCTION AND MAINTAIN
IT IN PROPER OPERATING CONDITION.
SERVICE AND MAINTENANCE
⚠ WARNING ⚠
If you turn OFF the power supply, turn OFF the gas.
NOTE: Use only factory-authorized replacement parts.
This unit will operate with a minimum of maintenance. To ensure long life and satisfactory performance, a furnace
that is operating under normal conditions should be inspected every four months. If the furnace is operating in an
area where an unusual amount of dust, soot, or other impurities are present in the air, more frequent inspection is
recommended.
OPERATING GAS VALVE MAINTENANCE
⚠ WARNING ⚠
The operating valve is the prime safety shutoff. To ensure positive closure, all gas supply lines
must be free of dirt or scale before connecting the unit.
Remove external dirt accumulation and check wiring connections.
The combination gas valve must be checked annually to ensure that the valve is completely shutting off gas flow.
Perform this annual check in accordance with the following steps:
a. Locate 1/8-inch FPT INLET pressure tap on combination gas valve (see Figure 36).
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