Amana AMH8 Operations Instructions download pdf (Page 59)

SERVICING

Gas Rate Range Nominal

High Stage 3.2 to 3.8" w.c. 3.5" w.c.

Low Stage 1.6 to 2.2" w.c. 1.9" w.c.

Manifold Gas Pressure

Natural Gas

WARNING

HIGH

VOLTAGE

ISCONNECT

ALL

ELECTRICAL POWER AND SHUT OFF GAS

SUPPLY BEFORE SERVICING OR INSTALLING THIS UNIT.

MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO

DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.

WARNING

HIGH

VOLTAGE

ISCONNECT

ALL

ELECTRICAL POWER AND SHUT OFF GAS SUPPLY

BEFORE SERVICING OR INSTALLING.

Gas Rate Range Nominal

High Stage 9.7 to 10.3" w.c. 10.0" w.c.

Low Stage 5.7 to 6.3" w.c. 6.0" w.c.

Manifold Gas Pressure

Propane Gas

S-308 CHECKING HOT SURFACE IGNITOR

120V Silicon Nitride Igniter - Amana® and Goodman®

Brand H model furnaces use a 120V silicon nitride igniter

for ignition. The normal operating temperature is approxi-

mately 2156°F - 2678°F. At room temperature the igniter

ohm reading should be from 37-68 ohms.

Place unit in heating cycle, measure current draw of igni-

tor during preheat cycle. The steady state current at 120V

is 0.37 to 0.68 amps. After checking and/or replacing of

hot surface ignitor, reinstall burner compartment door and

verify proper unit operation.

S-309 CHECKING FOR FLASHBACK

Flashback will also cause burning in the burner venturi,

but is caused by the burning speed being greater than the

gas-air flow velocity coming from a burner port.

Flashback may occur at the moment of ignition, after a

burner heats up or when the burner turns off. The latter is

known as extinction pop.

Since the end results of flashback and delayed ignition

can be the same (burning in the burner venturi) a definite

attempt should be made to determine which has occurred.

If flashback should occur, check for the following:

1. Improper gas pressure - adjust to proper pressure (See

S-307 CHECKING GAS PRESSURE)..

2. Check burner for proper alignment and/or replace

burner.

3. Improper orifice size - check orifice for obstruction.

S-310 CHECKING PRESSURE SWITCH

The pressure switch a safety device to prevent the com-

bustion cycle from occurring with inadequate venting

caused by a restricted or blocked vent pipe on the 80%

and 90% furnaces.

1. Remove burner compartment door to gain access to

pressure switch(es).

2. Remove wires from the pressure switch(es) electrical

terminals.

3. Using a VOM check from common terminal to NC (Nor-

mally Closed) - should read open.

If switch reads as above proceed to Step 4, otherwise

replace control.

4. Remove the pressure control hose from the control and

interconnect with an inclined manometer as shown in

the following figures.

1 2 ... 54 55 56 57 58 59 60 61 62

Comments to this Manuals

No comments

Amana AMH8 Operations Instructions Page 59

Comments to this Manuals

Related products and manuals for Water heaters & boilers Amana AMH8