Amana AMH8 Operations Instructions download pdf (Page 50)

SERVICING

If the anticipator current draw is unknown, then a current

amp draw should be measured to determine the anticipa-

tor setting. Use an amprobe as shown in the following draw-

ing.

10 TURNS OF

THERMOSTAT WIRE

(From "W" on thermostat)

STATIONARY JAW

OF AMPROBE

READS 4 AMPS

CURRENT DRAW

WOULD BE .4 AMPS

Checking Heating Anticipator Current (Amp) Draw

Cooling Anticipator

The cooling anticipator is a small heater (resistor) in the

thermostat. During the "OFF" cycle it heats the bimetal

element helping the thermostat call for the next cooling cycle.

This prevents the room temperature from rising too high

before the system is restarted. A properly sized anticipa-

tor should maintain room temperature within 1 1/2 to 2

degrees.

The anticipator is fixed in the subbase and is not to be

replaced. If the anticipator should fail for any reason, the

subbase must be changed.

S-4 CHECKING TRANSFORMER AND Control CIR-

CUIT

A step-down transformer 120 volt primary to 24 volt sec-

ondary, 40 VA (Heating and Cooling Models) supplies ample

capacity of power for either operation.

WARNING

HIGH VOLTAGE

ISCONNECT ALL POWER BEFORE SERVICING OR

CHANGING ANY ELECTRICAL WIRING.

MULTIPLE POWER

SOURCES MAY BE PRESENT.

FAILURE TO DO SO MAY CAUSE

PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.

1. Remove blower compartment door to gain access to

the thermostat low voltage wires located at the furnace

integrated control module.

2. Remove the thermostat low voltage wires at the furnace

integrated control module terminals.

With Power On (and Door Interlock Switch closed):

LINE VOLTAGE NOW PRESENT

WARNING

3. Use a voltmeter, check voltage across terminals R

and C. Must read 24 VAC.

4. No voltage indicates faulty transformer, open fuse,

bad wiring, bad splice, or open door interlock switch.

5. Check transformer primary voltage at incoming line

voltage connections, fuse, splices, and blower door

interlock switch.

6. If line voltage is available to the primary side of

transformer and not at secondary side, the trans-

former is inoperative. Replace.

7. After completing check and/or replacement of trans-

former and check and/or repair of control circuit, re-

install blower compartment door.

8. Turn on electrical power and verify proper unit op-

eration.

S-10 Capacitance Check

With power On (and Door Interlock Switch closed):

LINE VOLTAGE NOW PRESENT

WARNING

S-15 CHECKING CAPACITOR

The direct drive motors are of the permanent split capaci-

tor design. A run capacitor is wired across the auxiliary

and a portion of the main windings. The capacitors pri-

mary function is to reduce the line current while greatly

improving the torque characteristics of a motor. This is

accomplished by using the 90° phase relationship between

the capacitor current and voltage in conjunction with the

motor windings so that the motor will give two phase op-

eration when connected to a single phase circuit. The ca-

pacitor also reduces the line current to the motor by im-

proving the power factor to the load.

WARNING

ISCHARGE CAPACITOR THROUGH A 20 TO 30 OHM RESISTOR

BEFORE HANDLING.

Two quick ways to test a capacitor are a resistance and a

capacitance check. Refer to the next two figures for proper

meter connections for the resistance and capacitance test-

ing of the capacitor.

NOTE: Use a capacitor tester to check capacitance.

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Amana AMH8 Operations Instructions Page 50

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