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To adjust the pressure regulator, remove the regulator cap and turn the adjustment screw
clockwise to increase pressure or counterclockwise to decrease pressure.

Then replace

the regulator cap securely.

Any necessary major changes in the gas flow rate should be made by changing the size of
the burner orifices. To change orifice spuds, shut off the manual main gas valve and
remove the gas manifold.

For elevations up to 2,000 feet, rating plate input ratings apply. For high altitudes (elevations
over 2,000 ft.), see conversion kit index 92-21519-XX for derating and orifice spud sizes.

Check of input is important to prevent over-firing of the furnace beyond its design-
rated input. Never set input above that shown on the rating plate. Use the following
table or formula to determine input rate.

Heating Value of Gas
(BTU/Cu. Ft.) x 3600

Cu. Ft. Per Hr. Required =

Time in Seconds
(for 1 Cu. Ft.) of Gas

Start the furnace and measure the time required to burn one cubic foot of gas. Prior to
checking the furnace input, make certain that all other gas appliances are shut off, with
the exception of pilot burners. Time the meter with only the furnace in operation.

important note for altitudes above 2,000 feet (610 meters):

The main burner orifices

in your furnace and in these kits are sized for the nameplate input and intended for
installations at elevations up to 2,000 feet in the USA or Canada, or for elevations of
2,000 - 4,500 feet (610 -1,373 meters) in Canada if the unit has been derated at the fac-
tory. For elevations above 2,000 feet (610 meters)

IN THE USA ONLY

(see ANSI-

Z223.1), the burner orifices must be sized to reduce the input 4% for each 1,000 feet
(305 meters) above sea level.

NOTICE: DERATING OF THE HEATING INPUT FOR HIGH ALTITUDE IN THE FIELD
IS UNLAWFUL IN CANADA (REFER TO CAN/CGA 2.17). UNITS INSTALLED IN
ALTITUDES GREATER THAN 2,000 FEET (610 METERS) MUST BE SHIPPED FROM
THE FACTORY OR FROM A FACTORY AUTHORIZED CONVERSION STATION
WITH THE HEATING INPUT DERATED BY 10% SO AS TO OPERATE PROPERLY IN
ALTITUDES FROM 2,000 - 4,500 FEET (610 - 1,373 METERS).

D.CONDENSATE DRAIN

IMPORTANT:

Install a condensate trap to ensure proper condensate drainage. See

Figure 15.

The condensate drain pan has a threaded female 1 inch NPT (11.5 TPI) connection.
Consult local codes or ordinances for specific requirements of condensate drain piping
and disposal.

• To use the removable drain pan feature of this unit, some of the condensate line joints

should be assembled for easy removal and cleaning.

• Use a thin layer of Teflon tape or paste on drain pan connections and install only hand

tight.

• Do not over tighten drain pan connectioins as damage to the drain pan may occur.

• Drain line MUST NOT block service access panels.

• Drain line must be no smaller than drain pan outlet and adequately sized to accommo-

date the condensate discharge from the unit.

• Drain line should slope away from unit a minimum of 1/8” per foot to ensure proper

drainage.

ONE

40,000