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Filters
Even though a return air filter is not supplied with this unit,
there must be a means of filtering all return air. All units
may be externally filtered.
Refer to the unit filter size chart in the appendix for filter
size information.
Filters installed external to the unit should be sized in
accordance with their manufacturer recommendations. A
throwaway filter must be sized for a maximum face velocity
of 300 feet per minute.
Filter Installation
IMPORTANT NOTE: When installing a filter, the air flow
arrows on the filter must point toward the circulator blower.
VENTING
NOTE: Venting is self-contained. Do not modify or block.
Installation - Flue Hood Exhaust
1. Locate the flue hood assembly box from the blower
compartment.
2. Slide screen over flanges on the lower flue hood.
3. Slide screen into hood.
4. Using the three screws provided, attach the hood
(with the opening facing down) over the flue exhaust
opening in the utility panel.
HOOD
LOWER
FLUE
HOOD
LIP
Installation - Combustion Air Intake Hood
1. Locate the second hood.
2. Using the three screws provided, attach the hood
(with the opening facing down) to the heat exchanger
access door.
CONDENSATE DRAIN
Condensate Drain Connection
A 3/4" NPT drain connection is supplied for condensate
piping. An external trap must be installed for proper
condensate drainage.
NORMAL SEQUENCES OF OPERATION
HEAT PUMP OPERATION
SCREEN
Outdoor Thermostat
For optimal performance, a dual fuel thermostat with
an outdoor temperature sensor should be used.
TSTATGTS3275 (Emerson Dual Fuel thermostat)
with TSTATTSORS (outdoor temperature sensor) is
recommended.
This will allow the installer to control when the unit
switches from heat pump to gas heat based on a set point
entered into the thermostat. It is recommended to set the
thermostat between 35° - 45°F, depending on regional
climate and energy rates.
Optional Outdoor Thermostat (OTDFPKG-01)
The outdoor thermostat is an optional accessory that
can be set from 0 - 45°F and is set inside a "birdhouse"
12
DRAIN
CONNECTION
U
N
T I
FLEXIBLE
TUBING-HOSE
OR PIPE
A POSITIVE LIQUID
SEAL IS REQUIRED
Drain Connection
" 2
M
I
I N
M
U
M
3" MINIMUM
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