5464597-YIM-B-0518
Johnson Controls Ducted Systems
61
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).
EXAMPLE
By actual measurement, it takes 19 seconds for the hand on a 1
cubic foot dial to make a revolution with a 192,000 Btuh furnace
running. To determine rotations per minute, divide 60 by 19 =
3.16. To calculate rotations per hour, multiply 3.16
60 = 189.6.
Multiply 189.6
1 (0.5 if using a 1/2 cubic foot dial) = 189.6.
Multiply 189.6
(the Btu rating of the gas). For this example,
assume the gas has a Btu rating of 1050 Btu/ft.
3
. The result of
199,000 Btuh is within 5% of the 192,000 Btuh rating of the
furnace.
Manifold Gas Pressure Adjustment
This gas furnace has two heat stages. Therefore, the gas valve
has two adjustment screws located under a plastic protective
cover. The second stage (100% input) adjustment screw is
adjacent to the “HI” marking on the valve and the first stage
(60% input) adjustment screw is located adjacent to the “LO”
marking on the valve (See Figure 33).
Manifold pressure adjustment procedure.
Adjust second stage (100% input) pressure first, then adjust
first stage (60% input) pressure.
1.
Turn off all power to the unit.
2.
Using the outlet pressure port on the gas valve, connect a
manometer to monitor the manifold pressure.
3.
Remove plastic cap covering HI and LO pressure
adjustment screws.
4.
Turn on power to the unit.
5.
Set thermostat to call for second stage heat and start
furnace.
6.
If necessary, using a screwdriver, turn the
second stage
adjustment screw (adjacent to the “HI” marking on the
valve) clockwise to increase manifold pressure or
counterclockwise to decrease manifold pressure.
Be sure
not to over-fire the unit on second stage
.
7.
After the high manifold pressure has been checked, adjust
the thermostat to call for first stage heat.
8.
If necessary, using a screwdriver, turn the first stage
adjustment screw (adjacent to the “LO” marking on the
valve) clockwise to increase manifold pressure or
counterclockwise to decrease manifold pressure.
Be sure
not to under-fire the unit on first stage
.
9.
Once pressure has been checked, replace the plastic cap
covering the HI and LO pressure adjustment screws.
NOTE:
When using natural gas, the manifold pressure for
second stage (100% input) should be 3.5 IWG ± 0.3.
The manifold pressure for first stage (60% input) when
using natural gas should be 1.5 IWG ± 0.3.
Table 28: Gas Rate Cubic Feet Per Hour
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
Table 29: Gas Heat Stages
# of Burner Tubes
2nd Stage Input
(100% Btuh)
1st Stage Input
(60% Btuh)
4
120,000
72,000
6
180,000
108,000
8
240,000
144,000
