Page 18
Installer’s Guide
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Figure 18. Burner and Valve
NOTE
: For manifold pressures and orifice sizes for gas with
other BTU ratings, contact the local gas utility. Manifold
pressure should be 1.8 (low) to 3.5 (high) inches water column
(+0.1). Input for natural gas must
not
exceed the value shown
on the unit nameplate.
1. Install a tapped, Style A (1/8-inch NPT tap) shut-off gas cock at
the end of the gas supply line near the unit. Be sure the tapped
gas cock is downstream of the pressure regulator, if used.
2. Install a ground union joint downstream of the shut-off cock.
This joint must also be installed outside of the unit.
3. Install a drip leg at least six (6) inches in depth next to the union
as shown in Figure 17. This drip leg is required to collect any
sediment that may be deposited in the line.
4. Before connecting the piping circuit to the unit, bleed the air
from the supply line and then cap or plug the line and test the
pressure at the tapped shut-off cock. The pressure reading
should not exceed 14 inches water column.
5. Using an appropriate backup wrench on the gas valve inlet boss,
connect the gas piping to the unit. Check the completed piping
for leaks using a soap and water solution or the equivalent.
6. After installation of the gas pipe in the unit, the pipe opening
should be closed with the filler/barrier plug provided.
Manifold Pressure
Check the manifold pressure at the unit gas valve. Do not exceed
the recommended pressure shown on the unit nameplate.
Input Check and Adjustment
1. Make sure all gas appliances are off except the furnace.
2. Clock the gas meter with the furnace operating (determine the
dial rating of the meter) for one revolution.
3. Match the “Sec” column in the gas flow (in cfh) Table 3, on page
18, with the time clocked.
4. Read the “Flow” column opposite the number of seconds clocked.
5. Use the following factors if necessary.
6. Multiply the final figure by the heating value of the gas obtained
from the utility company and compare to the nameplate rating.
This must not exceed the nameplate rating.
7. Changes can be made by adjusting the manifold pressure.
a. Attach a manifold pressure gauge.
b. Remove the slot screw on top of the gas valve for 1st stage
manifold pressure adjustment. Remove slot screw on outlet
side for 2nd stage adjustment (See Figure 18).
c. Turn the adjustment nut in to increase the gas flow rate, and
out to decrease the gas flow rate using a 3/32" hex wrench.
Chart Flow Reading
2
Chart Flow Reading
4
10X Chart Flow Reading
4
For 1 Cu. Ft. Dial Gas Flow CFH =
For 1/2 Cu Ft. Dial Gas Flow CFH =
For 5 Cu. Ft. Dial Gas Flow CFH =
Outlet Pressure Boss
2nd Stage (HI)
Manifold Pressure
Adjustment
Regulator
Vent
Inlet Pres-
sure Boss
Gas Valve
ON/OFF
Toggle
Switch
High Fire Coil
Terminal (H)
1st Stage
(LO)
Manifold
Pressure
Adjustment
Common
Terminal (C)
Coaxial Coil
Terminal (M)
Table 3. Gas Flow in Cubic Feet Per Hour
2 Cubic Foot Dial
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