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If the terminals are unmarked, or to confirm the markings, use a voltmeter to find the Common
and “Hot” 24vac terminals:
a. Turn off the power to the heating and cooling system and the transformer.
b. With the voltmeter set to "Continuity", check for continuity between each terminal and the
metal frame of the heating and cooling system. Choose a spot on the heating and cooling
system such as a screw or unpainted edge, where a good electrical contact can be found.
c. If continuity is found between one of the terminals and the heating and cooling system,
that terminal will be the Common terminal.
d. With the power on to the transformer, use the voltmeter to locate the 24vac terminal.
If a Common or 24vac terminal cannot be located, it will be necessary to install a separate
transformer. If a hard-wired transformer is used, an isolated class II transformer is
recommended. The transformer must be installed according to local codes and ordinances.
5) Route the power cord through the air handler cabinet to the filter rack area. The cord should
be run so that it is not crimped or abraded and should have enough slack to allow the air
cleaner to be easily removed for routine maintenance. Position the power cord away from the
blower and other moving parts. If an existing access hole is not available, the 1-1/8” electrical
knock-outs adjacent to the filter rack can be used. Two grommets are provided to fit 1-1/8"
knock-out openings.
6) Slide the air cleaner into the filter rack with the power supply nearest the power cord, taking
care to slide the air cleaner between rivets on the inside of the filter rack frame.
7) Plug the power cord into the air cleaner
and position securely in place (fig 2).
Figure 2
8) Turn on the power to the air handler. The power indicator light on the air cleaner should
illuminate.
9) Apply the foam strip provided to the inside of the filter access door in order to prevent air
bypass.
10) Close the filter access door.
11) Turn the thermostat fan switch to the “ON” position.
12) Affix the electrical caution sticker and adhesive-backed media pad replacement record in a
prominent location near the air cleaner.
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Section II. Optional Plug-In Transformer
A plug-in transformer (part no. A412402) is available as an optional accessory to plug into any
110-Volt (AC) outlet to provide 24-Volt (AC) power to the unit.
WARNING:
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