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GAS ORIFICE CONVERSION FOR PROPANE (LP)
This furnace is constructed at the factory for natural gas-fired operation,
but may be converted to operate on propane (LP) gas by following the
steps below.
CAUTION
!
The gas supply must be shut off prior to disconnecting the electrical
power, before proceeding with the conversion.
WARNING
!
SHOCK HAZARD - Turn off electrical supply to furnace.
1. Shut off gas supply at valve upstream from furnace or at meter as
required.
2. Disconnect gas supply piping from gas valve on furnace.
3. Disconnect electrical wires from gas valve, noting which wires are
connected to which terminals
4. Remove the screws that attach the gas manifold to the burner sup-
port box.
5. Remove and discard natural gas orifices.
6. Remove LP (propane) orifices from the bag in the Customer
Packet.
7. Install the LP (propane) gas orifices supplied with the furnace.
Tighten to 15 - 25 in. - 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 blue cap from the brass regulator and turn the brass
regulator over so the LP arrows are pointing down towards the gas
valve. Replace the blue cap on the brass regulator.
Table 4: Nominal Manifold Pressure - High Fire
Manifold Pressures
Gas Heating
0–7999
Value
(BTU/cu ft)
in. W.C.
800
3.5
850
3.5
900
3.5
950
3.5
1000
3.5
1050
3.5
1100
3.2
2500 (LP)
9.8
PROPANE AND HIGH ALTITUDE CONVERSION KITS
It is very important to choose the correct kit 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 pro-
pane (LP) gas. Do not use this furnace with butane gas.
Incorrect gas orifices or a furnace that has been improperly converted will create an extremely dangerous condition resulting in premature 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 conversion.
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.
Johnson Controls Ducted Systems
Altitude (ft)
8000–8999
9000–9999
in. W.C.
in. W.C.
3.5
3.5
3.5
3.5
3.5
3.5
3.5
3.3
3.2
2.9
2.9
2.7
2.7
2.4
8.2
7.5
DANGER
!
11. Remove the natural gas tag and replace with the propane gas tag
supplied in the orifice bag.
12. Remove the blue conversion label on the furnace door after the fur-
nace has been converted.
13. Reconnect the gas supply piping to the gas valve and insure that all
gas connections are tight.
14. Turn on gas supply to furnace and check all gas connections with
suitable leak detector.
WARNING
!
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 it has been determined that the leak test
solution is non-corrosive.
HIGH ALTITUDE GAS ORIFICE CONVERSION
This furnace is constructed at the factory for natural gas-fired operation
at 0 ft to 7,999 ft (0 m to 2,438 m) above sea level.
The manifold pressure 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 7,999 ft (2,438 m) above sea level. Refer to
Table 4 for proper manifold pressure settings.
HIGH ALTITUDE PRESSURE SWITCH CONVERSION
For installation where the altitude is less than 5,000 ft (1,524m), it is not
required that the pressure switch be changed unless you are in an area
subject to low pressure inversions.
For altitudes above 5,000 ft, see the following kits:
• S1-1PS3306 - 060
• S1-1PS3307 - 080
• S1-1PS3302 - 100
Manifold Pressures
Gas Heating
0–2437
Value
(MJ/cu m)
kPa
29.8
0.87
31.7
0.87
33.5
0.87
35.4
0.87
37.3
0.87
39.1
0.87
41.0
0.80
93.2 (LP)
2.44
5715184-BIM-A-0519
Altitude (m)
2438–2742
2743–3048
kPa
kPa
0.87
0.87
0.87
0.87
0.87
0.87
0.87
0.81
0.80
0.73
0.73
0.67
0.66
0.61
2.03
1.86
11
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