York DJ150 installation manual Gas Rate Cubic Feet Per Hour

035-19046-002-B-0104

3.Measure the time needed for one revolution of the hand on the smallest dial on the meter. A typical gas meter has a 1/2 or a 1 cubic foot test dial.

4.Using the number of seconds it takes for one revolution of the dial, calculate the cubic feet of gas consumed per hour. (See example below).

5.If necessary, adjust the high pressure regulator as dis- cussed in the section “Manifold Gas Pressure Adjust- ment”. Be sure not to over-firethe furnace on Second stage. If in doubt, it is better to leave the Second stage of the furnace slightly under-fired. Repeat Steps 1-5.

To determine the rate of gas flow (First Stage)

1.Turn of all other gas appliances connected to the gas meter.

2.Turn on the furnace and make sure the thermostat is calling for first stage (60% input) heat.

3.Even when the thermostat is calling for first stage heat, the unit will light on second stage and will run on Second stage for 1 minute. Allow this one-minute time period to expire and be certain the unit is running on first stage.

4.Measure the time needed for one revolution of the hand on the smallest dial on the meter. A typical gas meter has a 1/2 or a 1 cubic foot test dial.

5.Using the number of seconds it takes for one revolution of the dial, calculate the cubic feet of gas consumed per hour (See example below).

6.If necessary, adjust the low pressure regulator as dis- cussed in the section “Manifold Gas Pressure Adjust- ment”. Be sure not to under-firethe furnace on first stage. If in doubt, it is better to leave the first stage of the furnace slightly over-fired (greater than 60% input). Repeat Steps 1-6.

TABLE 27: GAS RATE CUBIC FEET PER HOUR

Seconds	Size of Test Dial
for One
	1/2 cu. ft.	1 cu. ft.
Rev.
10	180	360
12	150	300
14	129	257
16	113	225
18	100	200
20	90	180
22	82	164
24	75	150
26	69	138
28	64	129
30	60	120
32	56	113
34	53	106
36	50	100
38	47	95
40	45	90
42	43	86
44	41	82
46	39	78
48	37	75
50	36	72
52	35	69
54	34	67
56	32	64
58	31	62
60	30	60

NOTE: To find the Btu input, multiply the number of cubic feet of gas consumed per hour by the Btu content of the gas in your particular locality (contact your gas company for this information as it varies widely from area to area).

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