268890-UIM-B-0607

In the USA use the following formula to calculate the furnace input.

For natural gas multiply the heat content of the gas BTU/SCF or Default 1030 BTU/SCF (38.4 MJ/m3), times 2 cubic ft. (0.056 m) of gas measured at the gas meter, times a barometric pressure and temperature correction factor of 0.960; times 3600, then divided by the time (In seconds) it took to measure 2 cubic ft. (0.056 m) of gas from the gas meter.

For propane (LP) gas multiply the heat content of the gas BTU/SCF or Default 2500 BTU/SCF (93.15 MJ/m3), times 1 cubic ft. (0.028 m) of gas mea- sured at the gas meter, times a barometric pressure and temperature correction factor of 0.960; times 3600, then divided by the time (In seconds) it took to measure 1 cubic ft. (0.028 m) of gas from the gas meter.

The formula for US input calculation using a cubic foot gas meter:

BTU/ft3 x 2 cu.ft. x 0.960 x 3600

=

BTU/H

BTU/ft3 x 1 cu.ft. x 0.960 x 3600

 

=

BTU/H

Seconds it took to measure the 2 cu.ft. of gas

Seconds it took to measure the 1 cu.ft. of gas

 

 

 

 

NATURAL GAS INPUT CALCULATION

 

 

PROPANE (LP) GAS INPUT CALCULATION

 

 

EXAMPLE:

 

 

EXAMPLE:

 

 

1030 x 2 x 0.960 x 3600

=

78,666.90

2500 x 1 x 0.960 x 3600

=

80,000.00

90.5

108

 

 

 

 

 

 

Natural Gas

 

 

Propane Gas

 

 

1030 BTU/SCF

 

 

2500 BTU/SCF

 

 

In Canada you will use the following formula to calculate the furnace input if you are using a cubic foot gas meter.

For Natural Gas multiply the Heat content of the gas MJ/m3 (or Default 38.4), times 2 cubic ft. of gas x 0.028 to convert from cubic feet to cubic meters measured at the gas meter, times a barometric pressure and temperature correction factor of 0.960; times 3600, then divided by the time it took to measure 2 cubic ft. (0.056 m) of gas from the gas meter.

For Propane (LP) Gas multiply the Heat content of the gas MJ/m3 (or Default 93.15), times 1 cu. ft. of gas x 0.028 to convert from cubic feet to cubic meters measured at the gas meter, times a barometric pressure and temperature correction factor of 0.960; times 3600, then divided by the time it took to measure 1 cubic ft. (0.028 m) of gas from the gas meter.

The formula for metric input calculation using a cubic foot gas meter:

MJ/m3 x 2 cu.ft. x 0.028 x 0.960 x 3600

 

=

MJ/H

x

0.2777

=

kW

x

3412.14

=

BTU/H

Seconds it took to measure the 2 cu.ft. of gas

 

 

 

 

 

 

 

 

 

 

NATURAL GAS INPUT CALCULATION

 

 

 

 

 

 

 

 

 

 

EXAMPLE:

 

 

 

 

 

 

 

 

 

 

38.4 x 2 x 0.028 x 0.960 x 3600

=

82.12

x

0.2777

=

22.80

x

3412.14

=

77,796.80

90.5

 

 

 

 

 

 

 

 

 

 

 

 

Natural Gas

 

 

 

 

 

 

 

 

 

 

1030 BTU/SCF = 38.4 MJ/m3

 

 

 

 

 

 

 

 

 

 

PROPANE (LP) GAS INPUT CALCULATION

 

 

 

 

 

 

 

 

 

 

EXAMPLE:

 

 

 

 

 

 

 

 

 

 

93.15 x 1 x 0.028 x 0.960 x 3600

=

83.46

x

0.2777

=

23.18

x

3412.14

=

79,093.4

108

 

 

 

 

 

 

 

 

 

 

 

 

Propane Gas

2500 BTU/SCF = 93.15 MJ/m3

In Canada use the following formula to calculate the furnace input if you are using a gas meter that measures cubic meters.

For Natural Gas multiply the Heat content of the gas MJ/m3 (or Default 38.4), times 0.10 m3 of gas measured at the gas meter, times a barometric pressure and temperature correction factor of 0.960; times 3600, then divided by the time it took to measure 0.10 m3 of gas from the gas meter.

For Propane (LP) Gas multiply the Heat content of the gas MJ/m3 (or Default 93.15), times 0.10 m3 of gas measured at the gas meter, times a baro- metric pressure and temperature correction factor of 0.960; times 3600, then divided by the time it took to measure 0.10 m3 of gas from the gas meter.

The formula for metric input calculation using a cubic meter gas meter:

MJ/m3 x m3 x 0.960 x 3600

=

MJ/H

x

0.2777

=

kW

x

3412.14

=

BTU/H

Seconds it took to measure the 0.10 m3 of gas

 

 

 

 

 

 

 

 

 

 

NATURAL GAS INPUT CALCULATION

 

 

 

 

 

 

 

 

 

 

EXAMPLE:

 

 

 

 

 

 

 

 

 

 

38.4 x 0.1 x 0.960 x 3600

=

82.94

x

0.2777

=

23.03

x

3412.14

=

78,581.60

160

 

 

 

 

 

 

 

 

 

 

Natural Gas

 

 

 

 

 

 

 

 

 

 

1030 BTU/SCF = 38.4 MJ/m3

 

 

 

 

 

 

 

 

 

 

PROPANE (LP) GAS INPUT CALCULATION

 

 

 

 

 

 

 

 

 

 

EXAMPLE:

 

 

 

 

 

 

 

 

 

 

93.15 x 0.1 x 0.960 x 3600

=

83.19

x

0.2777

=

23.10

x

3412.14

=

78,826.3

387

 

 

 

 

 

 

 

 

 

 

Propane Gas

2500 BTU/SCF = 93.15 MJ/m3

DO NOT ADJUST the manifold pressure regulator if the actual input is equal to or within 8% less than the furnace input specified on the rating plate or if the furnace rise is above the specified rise range on the rating plate.

If the actual input is significantly higher than the furnace input specified on the rating plate then replace the gas orifices with the gas orifices of the proper size for the type of gas you are using.

Unitary Products Group

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York GM9S*DH, GY9S*DH, GF9S*DH installation manual USA use the following formula to calculate the furnace input
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