Amana AMH8 Operations Instructions download pdf (Page 55)

SERVICING

VOLT / OHM

METER

RED

RESET

BUTTON

COLOR

IDENTIFYING

TAB

Checking Flame Rollout Switch

a. If no voltage is measured on either side of control it

indicates ignition control or wiring to control prob-

lem.

b. If voltage is measured on one side of the control and

not the other it indicates the control is open.

c. If voltage is measured on both sides of the control

the wiring to gas valve or valve is at fault.

3. After check and/or replacement of rollout switch, rein-

stall burner compartment door and verify proper unit

operation.

S-303 INDUCED DRAFT BLOWER Motor

WARNING

HIGH VOLTAGE

ISCONNECT ALL POWER BEFORE SERVICING OR

INSTALLING THIS UNIT.

MULTIPLE POWER SOURCES MAY

BE PRESENT.

FAILURE TO DO SO MAY CAUSE PROPERTY

DAMAGE, PERSONAL INJURY OR DEATH.

1. Remove burner compartment door to gain access to

the induced draft blower motor.

2. Disconnect the motor wire leads from its connection

point at the induced draft motor.

3. Using a ohmmeter, test for continuity between each

of the motor leads.

4. Touch one probe of the ohmmeter to the motor frame

(ground) and the other probe in turn to each lead.

If the windings do not test continuous or a reading is

obtained to ground, replace the motor.

5. If the windings have a continuity reading, reconnect

wires. Turn power on to the furnace and turn the

thermostat on in the heating mode. Check voltage

for 115V at the induced draft motor terminals during

the trial for ignition. If you have 115V and the motor

does not run, replace the induced draft motor.

6. After completing check and/or replacement of in-

duced draft motor, reinstall burner compartment

door.

7. Turn on electrical power and verify proper unit opera-

tion.

S-304 CHECKING GAS VALVE (Redundant)

A combination redundant operator type gas valve which

provides all manual and automatic control functions required

for gas fired heating equipment is used.

The valve provides control of main burner gas flow, pres-

sure regulation, and 100 percent safety shut-off.

WARNING

ISCONNECT

ALL

POWER BEFORE SERVICING

Two stage gas valves always require 24 volts between com-

mon and low fire (main coil) to open. H model furnaces

are designed to light in high fire. Therefore; when check-

ing a gas valve on the H model furnace, look for 24 volt

power between common and low AND common and high.

Also see section S-307 on Checking Gas Pressure.

S-305 CHECKING MAIN BURNERS

The main burners are used to provide complete combus-

tion of various fuels in a limited space, and transfer this

heat of the burning process to the heat exchanger.

Proper ignition, combustion, and extinction are primarily

due to burner design, orifice sizing, gas pressure, primary

and secondary air, vent and proper seating of burners.

.023" - .027"

Beckett Burner

WARNING

ISCONNECT

ALL

AS AND

LECTRICAL

OWER

UPPLY.

In checking main burners, look for signs of rust, oversized

and undersized carry over ports restricted with foreign ma-

terial, etc, refer to previous drawing. Burner cross-over

slots must not be altered in size.

S-306 CHECKING ORIFICES

No resizing should be attempted until all factors are taken

into consideration such as inlet and manifold gas pres-

sure, alignment, and positioning, specific gravity and BTU

content of the gas being consumed.

The only time resizing is required is when a reduction in

firing rate is required for an increase in altitude.

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Amana AMH8 Operations Instructions Page 55

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