Amana AMH8 Operations Instructions download pdf (Page 42)

POLARIZATION AND PHASING

As more and more electronic's are introduced to the Heat-

ing Trade, Polarization of incoming power and phasing

of primary to secondary voltage on transformers becomes

more important.

Polarization has been apparent in the Appliance industry

since the introduction of the three prong plug, however,

the Heating Industry does not use a plug for incoming

power, but is hard wired.

Some of the electronic boards being used today, with

flame rectification, will not function properly and/or at all

without polarization of incoming power. Some also re-

quire phasing between the primary and secondary sides

of step-down transformers.

THIS IS L1 OR THE

HOT POWER LEG

INCOMING POWER

THIS IS THE COMMON

OR NEUTRAL LEG

METER READS

120 VOLTS

METER READS

0 VOLTS

GND

VOLT / OHM

METER

VOLT / OHM

METER

These then should be wired to the furnace accordingly.

CHECKING FOR PHASING - PRIMARY TO SECONDARY OF UNMARKED TRANSFORMERS*

If meter reads approximately 96 volts - the primary to secondary are in phase - if reads approximately 144 volts out of

phase - reverse low voltage wires.

*NOTE: For flame rectification the common side of the secondary voltage (24 V) is cabinet grounded. If you were to

bench test a transformer the primary neutral and secondary common must be connected together for testing purposes.

Some transformers will display phasing symbols as shown

in the illustration to the left to assist in determining proper

transformer phasing.

Checking for polarization and phasing should become a

habit in servicing. Let's start now.

NOTE: Newer integrated ignition controls have a diagnos-

tic flash code for reversed polarity (Refer to Troubleshoot-

ing-Diagnostic Chart for LED Codes).

VOLT / OHM

METER

PRIMARY

SECONDARY

TRANSFORMER

METER READS

24 VOLTS

LINE VOLTAGE

(NEUTRAL)

LINE VOLTAGE

L1 (HOT)

VOLT / OHM

METER

METER READS

120 VOLTS

VOLT / OHM

METER

OLT / OHM

METER

READS 96 VOLTS - IN PHASE

OLT / OHM

METER

READS 144 VOLTS - OUT OF PHASE

NEUTRAL

PHASING SYMBOL

24 V

120 V

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Amana AMH8 Operations Instructions Page 42

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