York W)036 THRU 060 Specifications download pdf (Page 49)

542300-YIM-A-1009

Johnson Controls Unitary Products 49

Burners are now accessible for service.

Reverse the above procedure to replace the assemblies. Make

sure that burners are level and seat at the rear of the heat

exchanger.

Burner Air Shutter Adjustment

Adjust burner shutters so no yellow flame is observed in the

heat exchanger tubes.

Checking Gas Input

Natural Gas

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

2. With the furnace turned on, measure the time needed for

one revolution of the hand on the smallest dial on the

meter. A typical gas meter usually has a 1/2 or a 1 cubic

foot test dial.

3. Using the number of seconds for each revolution and the

size of the test dial increment, find the cubic feet of gas

consumed per hour from the Gas Rate - Cubic Feet Per

Hour (Table 24).

If the actual input is not within 5% of the furnace rating (with

allowance being made for the permissible range of the regulator

setting), replace the orifice spuds with spuds of the proper size.

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 - it varies widely from city to city.)

Table 24: Gas Rate-Cubit Feet per Hour

1. By actual measurement, it takes 38 seconds for the hand on

the 1-cubic foot dial to make a revolution with a 100,000 Btuh

furnace running. Using this information, located 38 seconds

in the first column in the table above. Read across to the

column headed “1 Cubic Foot”, where you will see that 95

cubic feet of gas per hour are consumed by the furnace at

that rate. Multiply 95 X 1050 (the Btu rating of the gas

obtained from the local gas company). The result is 99,750

Btuh, which is close to the 100,000 Btuh rating of the furnace.

Seconds for

One Rev.

Size of Test Dial

1/2 cu. ft. 1 cu. ft.

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

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 57 58

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York W)036 THRU 060 Specifications Page 49

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