An accessible manual shutoff valve must be installed upstream of the furnace gas controls and within 6 feet (1.8 m) of the furnace.
The furnace must be isolated from the gas supply piping system by closing its individual external manual shutoff valve during any pressure testing of the gas supply piping system at pressures equal to or less than 0.5 psig (3.5 kPa).
The gas valve body is a very thin casting that cannot take any exter- nal pressure. Never apply a pipe wrench to the body of the gas valve when installing piping. A wrench must be placed on the octagon hub located on the gas inlet side of the valve. Placing a wrench to the body of the gas valve will damage the valve causing improper opera- tion and/or the valve to leak.
Gas piping may be connected from either side of the furnace using any of the gas pipe entry knockouts on both sides of the furnace. Refer to Figure 13.
Table 5: Nominal Manifold Pressure - High Fire
GAS ORIFICE CONVERSION FOR PROPANE (LP)
This furnace is constructed at the factory for natural
HIGH ALTITUDE GAS ORIFICE CONVERSION
This furnace is constructed at the factory for natural
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 feet (2,438 m) above sea level. Refer to Table 5 for proper manifold pressure settings.
HIGH ALTITUDE PRESSURE SWITCH CONVERSION
For installation where the altitude is less than 5,000 feet (1,524m), it is not required that the pressure switch be changed unless you are in an area subject to low pressure inversions.
|
| Manifold Pressures (in. w.c.) |
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|
|
| Manifold Pressures (kPa) |
| ||||
|
|
|
| Altitude (feet) |
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|
|
|
|
| Altitude (m) |
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| ||||||
Gas Heating Value |
| 800 | 3.5 | 3.5 | 3.5 |
| Gas Heating Value |
| 29.8 | 0.87 | 0.87 | 0.87 |
| 850 | 3.5 | 3.5 | 3.5 |
|
| 31.7 | 0.87 | 0.87 | 0.87 | ||
(BTU/cu ft.) | 900 | 3.5 | 3.5 | 3.5 |
| (MJ/cu m) | 33.5 | 0.87 | 0.87 | 0.87 | ||
950 | 3.5 | 3.5 | 3.3 |
| 35.4 | 0.87 | 0.87 | 0.81 | ||||
1000 | 3.5 | 3.2 | 2.9 |
| 37.3 | 0.87 | 0.80 | 0.73 | ||||
1050 | 3.5 | 2.9 | 2.7 |
| 39.1 | 0.87 | 0.73 | 0.67 | ||||
1100 | 3.2 | 2.7 | 2.4 |
| 41.0 | 0.80 | 0.66 | 0.61 | ||||
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|
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|
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|
|
| ||
|
| 2500 (LP) | 9.8 | 8.2 | 7.5 |
|
|
| 93.2 (LP) | 2.44 | 2.03 | 1.86 |
TABLE 6: Nominal Manifold Pressure - Low Fire
First Stage Manifold Pressures (in. w.c.)
|
|
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| Altitude (feet) |
|
|
|
| |||
Value |
| 800 | 1.7 | 1.7 | 1.7 |
| 850 | 1.7 | 1.7 | 1.7 | |
ft.) | 900 | 1.7 | 1.7 | 1.7 | |
HeatingGas | (BTU/cu | 950 | 1.7 | 1.7 | 1.5 |
|
| 1000 | 1.6 | 1.5 | 1.4 |
|
| 1050 | 1.5 | 1.4 | 1.3 |
|
| 1100 | 1.3 | 1.2 | 1.1 |
|
| 2500 (LP) | 4.1 | 3.8 | 3.5 |
Heating Value | (MJ/cu m) |
Gas |
|
First Stage Manifold Pressures (kPa) |
| ||
|
| Altitude (m) |
|
| |||
29.8 | 0.42 | 0.42 | 0.42 |
31.7 | 0.42 | 0.42 | 0.42 |
33.5 | 0.42 | 0.42 | 0.42 |
35.4 | 0.42 | 0.42 | 0.38 |
37.3 | 0.41 | 0.37 | 0.34 |
39.1 | 0.37 | 0.34 | 0.31 |
41.0 | 0.34 | 0.31 | 0.28 |
93.2 (LP) | 1.03 | 0.95 | 0.87 |
DANGER
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, caus- ing premature heat exchanger burnout, high levels of carbon monoxide, excessive sooting, a fire hazard, personal injury, property damage and/or death.
Johnson Controls Unitary Products | 11 |
