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• Make provisions for disconnecting and cleaning of the primary drain line should it
become necessary. Install a 3 in. trap in the primary drain line as close to the unit as
possible. Make sure that the top of the trap is below connection to the drain pan to
allow complete drainage of pan (See Figure 3).
• Auxiliary drain line should be run to a place where it will be noticeable if it becomes
operational. Occupant should be warned that a problem exists if water should begin
running from the auxiliary drain line.
• Plug the unused drain connection with the plugs provided in the parts bag, using a
thin layer of teflon paste, silicone or teflon tape to form a water tight seal.
• Test condensate drain pan and drain line after installation is complete. Pour water into
drain pan, enough to fill drain trap and line. Check to make sure drain pan is draining
completely, no leaks are found in drain line fittings, and water is draining from the ter-
mination of the primary drain line.
7.12 DUCT FLANGES
Field-installed duct flanges (4 pieces) are shipped with units. Install duct flanges as
needed on top of the unit. (See Figure 3.)
8.0 AIR FILTER (not factory-installed)
• External filter or other means of filtration is required. Units should be sized for a maxi-
mum of 300 feet/min. air velocity or that recommended for the type filter installed.
Filter application and placement are critical to airflow, which may affect the heating and
cooling system performance. Reduced airflow can shorten the life of the system's major
components, such as motor, limits, elements, heat relays, evaporator coil or compressor.
Consequently, we recommend that the return air duct system have only one filter loca-
tion. For systems with a return air filter grill or multiple filter grills, can have a filter
installed at each of the return air openings.
If high efficiency filters or electronic air cleaners are used in the system, it is important
that the airflow is not reduced to maximize system performance and life. Always verify
that the system's airflow is not impaired by the filtering system that has been installed,
by performing a temperature rise and temperature drop test.
IMPORTANT: DO NOT DOUBLE FILTER THE RETURN AIR DUCT SYSTEM. DO NOT
FILTER THE SUPPLY AIR DUCT SYSTEM.
WARNING
Do not operate the system without filters. A portion of the dust entrained in the
air may temporarily lodge in the duct runs and at the supply registers. Any cir-
culated dust particles could be heated and charred by contact with the air han-
dler elements. This residue could soil ceilings, walls, drapes, carpets and
other articles in the house.
Soot damage may occur with filters in place, when certain types of candles, oil
lamps or standing pilots are burned.
9.0 SEQUENCE OF OPERATION
9.1 COOLING (COOLING ONLY OR HEAT PUMP)
• When the thermostat "calls for cooling," the circuit between R and G is completed,
causing the blower relay (BR) to energize. The N.O. contacts will close, causing the
indoor blower motor (IBM) to operate. The circuit between R and Y is also completed:
This circuit closes the contactor (CC) in the outdoor unit starting the compressor
(COMP) and outdoor fan motor (OFM).
9.2 HEATING (ELECTRIC HEAT ONLY)
• When the thermostat "calls for heat," the circuit between R and W is completed, and
the heater sequencer (HR
blower motor (IBM) will come on. Units with a second heater sequencer (HR
connected with the first sequencer (HR
nected to a second stage W
) is energized. The heating elements (HE) and the indoor
1
) to W on the thermostat sub-base or con-
1
on the sub-base.
2
) can be
2
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