Measure Gas Supply Pressure; Measure And Adjust Gas Manifold Pressure - Amana 10759833 Installation Instructions Manual

Startup Adjustments and Measurements

Measure Gas Supply Pressure

CAUTION
To prevent unreliable operation or equipment
damage, the inlet gas supply pressure must be as
specified on the unit rating plate with all other
household gas fired appliances operating.
The line pressure supplied to the gas valve must be within
the range specified in the "Inlet Gas Supply Pressure"
table.
Inlet Gas Supply Pressure
Natural Gas Minimum:5.0" W.C. Maximum :10.0" W.C.
Propane Gas Minimum:11.0" W.C. Maximum :13.0" W.C.
Measure the supply pressure at the gas valve inlet pres-
sure tap or at a hose fitting installed in the gas piping drip
leg. The supply pressure must be measured with the
burners operating. To measure the gas supply pressure,
use the following procedure.
1. Turn OFF gas to furnace at the manual gas shutoff
valve external to the furnace.
2. Connect a calibrated water manometer (or appropri-
ate gas pressure gauge) at either the gas valve inlet
pressure tap or the gas piping drip leg.
NOTE: At either location, a hose fitting must be installed
prior to making the hose connection.
Gas Line
Gas
Shutoff
Valve
Drip Leg Cap
With Fitting
Manometer Hose
Measuring Inlet Gas Pressure
(Alternate Method)
3. Turn ON the gas supply and operate the furnace and
all other gas consuming appliances on the same gas
supply line.
Gas Line
To Furnace
Open To
Atmosphere
Manometer
4. Measure furnace gas supply pressure with burners
firing. Supply pressure must be within the range
specified in the "Inlet Gas Supply Pressure" table .
If supply pressure differs from the table, make necessary
adjustments to pressure regulator, gas piping size, etc.,
and/or consult with local gas utility.
5. Turn OFF gas to furnace at the manual shutoff valve
and disconnect manometer. Reinstall plug before
turning on gas to furnace.
6. Turn OFF any unnecessary gas appliances started in
step 3.

Measure and Adjust Gas Manifold Pressure

To prevent unreliable operation or equipment
damage, the gas manifold pressure must be as
specified on the unit rating plate. Only minor
adjustments should be made by adjusting the gas
valve pressure regulator.
Only small variations in gas pressure should be made by
adjusting the gas valve pressure regulator. The manifold
pressure must be measured with the burners operating.
To measure and adjust the manifold pressure, use the
following procedure.
1. Turn OFF gas to furnace at the manual gas shutoff
valve external to the furnace.
2. Connect a calibrated water manometer (or appropri-
ate gas pressure gauge) at the gas valve outlet pres-
sure tap (refer to gas valve figure in previous
section).
3. Turn ON the gas supply and operate the furnace.
4. Measure gas manifold pressure with burners firing.
Adjust manifold pressure using the table below.
Manifold Gas Pressure
Gas
Natural Low Stage 1.6 - 2.2" w.c.
High Stage 3.0 - 3.6" w.c.
Propane Low Stage 5.7 - 6.3" w.c.
High Stage 9.7 - 10.3" w.c.
The final manifold pressure must not vary more
than ± 0.3 " w.c. from the above specified pressures. Any
necessary major changes in gas flow rate should be made
by changing the size of the burner orifice.
5. To adjust the gas valve pressure regulator, remove
the regulator cap.
27 27
CAUTION
Range Nominal
1.9" w.c.
3.5" w.c.
6.0" w.c.
10.0" w.c.