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Gas Meter Clocking Chart
Seconds for One Revolution
Natural
Capacity
1 cu ft
Dial
070
55
090
41
110
33
Natural - 1000 btu/cu ft
Table 13.
Supply Line Pressure
A threaded plug on the inlet side of the gas valve provides
access to the supply pressure tap.
Honeywell Valve
1. Remove the threaded plug.
2.
Install a field provided barbed fitting.
3.
Connect a manometer.
White Rodgers Valve
1. Loosen threaded plug (removal not required).
2.
Connect a manometer.
See Table 15 for supply line pressure. Replace or tighten
the threaded plug after measurements have been taken.
Capacity
Gas
Natural
070
LP / propane
Natural
090
LP / propane
Natural
110
LP / propane
This is the only permissible derate for these units.
1
Natural gas high altitude orifice kit required.
2
A natural to L.P./propane gas changeover kit is necessary to convert this unit. Refer to the changeover kit installation instruction for
3
the conversion procedure.
NOTE: Units may be installed at altitudes up to 4500 ft. above sea level without modifications.
507335-03
LP
2 cu ft
1 cu ft
2 cu ft
Dial
Dial
110
136
82
102
66
82
LP - 2500 btu/cu ft
Orifice
Orifice
Size
Size
0 - 7500
7501 -
ft.
10000 ft.
1
.063
.055
.034
.032
3
.063
.055
.034
.032
3
.063
.055
.034
.032
3
Table 15. Manifold and Supply Line Pressure 0 - 10,000 ft.
Manifold Pressure
NOTE: A pressure test adapter kit is available to facilitate
manifold pressure measurement.
1. Connect test gauge to manifold pressure tap (Figure
Dial
34 and Figure 35) on gas valve.
272
2.
Ignite unit on high fire and let run for 5 minutes to allow
204
for steady state conditions.
164
3.
After allowing unit to stabilize for 5 minutes, record
manifold pressure and compare to value given in
Table 15.
4.
If necessary, make adjustments. Figure 34 and Figure
35 show the location of high fire adjustment screw.
5.
If an adjustment is made on high fire, re-check
manifold pressure on low fire. Do not adjust low fire
manifold pressure. If low fire manifold pressure is
more than 1/2" above or below value specified in Table
15, replace valve.
Proper Combustion
Furnace should operate a minimum 15 minutes with correct
manifold pressure and gas flow rate before checking
combustion. Take combustion sample beyond the flue
out let and compare to Table 14. The maximum carbon
monoxide reading should not exceed 100 ppm.
Firing Rate
High Fire
Low Fire
Manifold
Manifold
Pressure in. w.g.
Pressure in. w.g.
0 - 4500 ft.
4501 - 7500 ft.
Low
High
Low
Fire
Fire
Fire
1.7
3.5
1.6
4.5
10.0
4.5
1.7
3.5
1.5
4.5
10.0
4.5
1.7
3.5
1.5
4.5
10.0
4.5
Issue 2302
CO2% for Nat
6.8 - 7.4
4.2 - 5.7
Table 14.
Manifold
Pressure in. w.g.
7501 - 10000 ft.
2
High
Low
High
Fire
Fire
Fire
3.4
1.7
3.5
10.0
4.5
10.0
3.2
1.7
3.5
10.0
4.5
10.0
3.2
1.7
3.5
10.0
4.5
10.0
CO2% for L.P.
7.5 - 9.0
5.0 - 6.0
Supply Line
Pressure
in. w.g.
Min
Max
4.5
13.0
11.0
13.0
4.5
13.0
11.0
13.0
4.5
13.0
11.0
13.0
Page 31 of 39
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