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CONVERSION
PROCEDURE
CAUTION
The gas supply must be shut off prior to disconnecting
the electrical
power, before proceeding
with the conversion.
AWARNING
SHOCK HAZARD - Turn off electrical supply to furnace
1.
Shut off gas supply at valve upstream from furnace or at meter as
required. Refer to Figure 8.
2.
Disconnect
as supply piping from gas valve on furnace.
3.
Disconnect
electrical
wires from gas valve, nothing which wires
are connected
to which terminals.
4.
Remove the four screws that attach the gas manifold to the burner
support box. See Figure 9.
5.
Remove and discard natural gas orifices.
6.
Remove LP (Propane) orifices from the bag attached to the gas
valve.
7.
Install the LP (Propane)
gas orifices supplied
with the furnace.
Tighten to 15 - 25 inch - pounds of torque.
8.
Reinstall the manifold
in the assembly
by reversing the removal
process.
9.
Reconnect the wires to the proper terminals on the gas valve.
10.
Remove the regulator with the blue cap and turn it upside down so
the letters "LP" are upright. Place the blue cap on the opposite end
of the regulator.
11.
Convert the gas valve for LP (propane) gas operation by following
the instructions.
Remove the natural tag and replace with the pro-
pane tag supplied in the orifice bag to the gas burner mounting
plate to show that is has been converted.
12.
Remove the blue conversion
label on the furnace door after the
furnace has been converted.
13.
Reconnect
the gas supply piping to the gas valve and insure that
all gas connections
are tight.
14.
Remove
pressure tap plugs from gas valve and connect
water
gauge to the pressure tap ports. See Figure 22 for location of the
gas valve pressure taps and pressure regulator adjustment.
15.
Turn on gas supply to furnace and check all gas connections
with
suitable leak detector.
98618/035-20009-001
Rev. B (1205)
HIGH
ALTITUDE
GAS
ORIFICE
CONVERSION
This furnace is constructed
at the factory for natural gas-fired operation
at 0 - 2,000 ft. (0 m - 610 m) above sea level.
The gas orifices on this furnace must be changed in order to maintain
proper and safe operation, when the furnace is installed in a location
where the altitude is greater than 2,000 ft. (610 m) above sea level on
natural gas or the altitude is greater than 4,000 ft. (1219 m) above sea
level on propane (LP) gas. Refer to Table 7 or the instructions
in the
high altitude conversion kit for the proper gas orifice size.
The unit may also be converted for altitudes up to 10,000 ft. (3048 m)
on natural and propane (LP) gas with additional derate as shown in
Table 7 or refer to ANSI Z223.1 NFPA 54 National Fuel Gas Code or in
Canada
CAN/CGA-B149.1-00
Natural
Gas and Propane
Installation
Code.
kDANGER
PROPANE AND HIGH ALTITUDE
CONVERSION
KITS
It is very important to choose the correct kff and/or gas orifices for
the altitude
and the type of gas for which the furnace is being
installed.
Only use natural gas in furnaces designed for natural gas. Only use
propane (LP) gas for furnaces that have been properly converted to
use propane (LP) gas. Do not use this furnace with butane gas.
Incorrect
gas orifices or a furnace that has been improperly
con-
verted will create an extremely dangerous condition resulting in pre-
mature heat exchanger
failure, excessive
sooting,
high levels of
carbon monoxide,
personal injury, property damage, a fire hazard
and/or death.
High altitude and propane (LP) conversions
are required in order
for the appliance to satisfactory
meet the application.
An authorized distributor or dealer must make all gas conversions.
In Canada, a certified conversion station or other qualified agency,
using factory specified
and/or approved
parts, must perform
the
con version.
The installer must take every precaution to insure that the furnace
has been converted to the proper gas orifice size when the furnace
is installed.
Do not attempt
to drill out any orifices to obtain the
proper orifice size. Drilling out a gas orifice will cause misalignment
of the burner flames, causing premature
heat exchanger burnout,
high levels of carbon monoxide,
excessive sooting, a fire hazard,
personal injury, property damage and/or death.
AWARNING
Never use an open flame to check for leaks. Fire or explosion could
occur. Since some leak solutions
including
soap and water may
cause corrosion or stress cracking, the piping must be rinsed with
water after testing unless ff has been determined
that the leak test
solution is non-corrosive.
TABLE 7: High Altitude Conversion
Type
Orifice at
2,000 ft.
Of Gas
Sea Level
(610 m)
Natural
#42
#42
Propane
#54
#54
3,000 ft.
4,000 ft.
5,000 ft.
6,000 ft.
7,000 ft.
8,000 ft.
9,000 ft.
10,000 ft.
(914 m)
(1219 m)
(1524 m)
(1829 m)
(2134 m)
(2438 m)
(2743 m)
(3048 m)
#43
#43
#43
#44
#44
#45
#46
#47
#55
#55
#55
#55
#55
#56
#56
#56
Unitary Products Group
9
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