Johnson Controls TM9V*MP installation manual GAS Orifice Conversion for Propane LP

701379-UIM-C-0712

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 gas-fired operation, but may be converted to operate on propane (LP) gas by using a factory-supplied LP conversion kit. Follow the instructions supplied with the LP kit.

HIGH ALTITUDE GAS ORIFICE CONVERSION

This furnace is constructed at the factory for natural gas-fired operation at 0 –7,999 feet (0 – 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 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.)						Manifold Pressures (kPa)
				Altitude (feet)						Altitude (m)
			0-7999	8000-8999	9000-9999				0-2437	2438-2742	2743-3048
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
		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.)

				Altitude (feet)
			0-7999	8000-8999	9000-9999
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)
	0-2437	2438-2742	2743-3048
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.

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