Amana AMH8 Operations Instructions download pdf (Page 56)

SERVICING

Orifices should be treated with care in order to prevent

damage. They should be removed and installed with a box-

end wrench in order to prevent distortion. In no instance

should an orifice be peened over and redrilled. This will

change the angle or deflection of the vacuum effect or en-

training of primary air, which will make it difficult to adjust

the flame properly. This same problem can occur if an ori-

fice spud of a different length is substituted.

WARNING

ISCONNECT

ALL

AS AND

LECTRICAL

OWER

UPPLY.

1. Check orifice visually for distortion and/or burrs.

2. Check orifice size with orifice sizing drills.

3. If resizing is required, a new orifice of the same physi-

cal size and angle with proper drill size opening should

be installed.

GAS

STREAM

The length of Dimension "A" determines the angle of Gas

Stream "B".

DENT OR

BURR

GAS

STREAM

A dent or burr will cause a severe deflection of the gas

stream.

S-307 CHECKING GAS PRESSURE

Gas Supply Pressure Measurement

O 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.

CAUTION

Gas inlet and manifold pressures should be checked and

adjusted in accordance to the type of fuel being consumed.

The line pressure supplied to the gas valve must be within

the range specified below. The supply pressure can be

measured at the gas valve inlet pressure tap or at a hose

fitting installed in the gas piping drip leg. The supply pres-

sure must be measured with the burners operating. To mea-

sure the gas supply pressure, use the following proce-

dure.

WARNING

ISCONNECT ELECTRICAL POWER AND SHUT OFF GAS SUPPLY.

1. After turning off gas to furnace at the manual gas shut-

off valve external to the furnace, remove burner com-

partment door to gain access to the gas valve.

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 as shown in the

following figures.

NOTE: At either location, a hose fitting must be installed

prior to making the hose connection.

NOTE: Use apapter kit #0151K00000S to measure gas

pressure on White-Rodgers and 36G54 gas valves.

GAS LINE

GAS SHUTOFF VALVE

GAS LINE

TO FURNACE

DRIP LEG CAP

WITH FITTING

MANOMETER HOSE

MANOMETER

OPEN TO

ATMOSPHERE

Measuring Inlet Gas Pressure

(Alternate Method)

3. Turn ON the gas and electrical power supply and op-

erate the furnace and all other gas consuming appli-

ances on the same gas supply line.

4. Measure furnace gas supply pressure with burners fir-

ing. Supply pressure must be within the range speci-

fied in the following table.

Natural Gas Minimum: 4.5" w.c. Maximum: 10.0" w.c.

Propane Gas Minimum: 11.0" w.c. Maximum: 13.0" w.c.

INLET GAS SUPPLY PRESSURE

If supply pressure differs from above, make necessary

adjustments to pressure regulator, gas piping size, etc.,

and/or consult with local gas utility.

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Amana AMH8 Operations Instructions Page 56

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