14
necessary adjustment for high altitude applications. They
restore the optimal fuel to air mixture and maintain healthy
combustion on altitudes above 2000 ft (610 m).
NOTE: Typical natural gas heating value ranges from 975 to
1050 Btu/ft
3
at sea level nationally. The heating value goes
down approximately 1.7% per every thousand feet elevation.
Standard factory orifices can typically be used up to 2000 ft
(610 m) elevation without any operational issues.
Flue Discharge Deflector — The flue discharge deflector is
a useful accessory when flue gas recirculation is a concern. By
venting the flue discharge upwards, the deflector minimizes the
chance for a neighboring unit to intake the flue exhaust.
Winter Start Kit — The winter start kit by Bryant extends
the low ambient limit of your rooftop to 25°F (–4°C). The kit
bypasses the low pressure switch, preventing nuisance tripping
of the low pressure switch. Other low ambient precautions may
still be prudent.
Motormaster
®
Head Pressure Controller — The
Motormaster motor controller is a low ambient, head pressure
controller kit that is designed to maintain the unit’s condenser
head pressure during periods of low ambient cooling operation.
This device should be used as an alternative to economizer free
cooling when economizer usage is either not appropriate or
desired. The Motormaster controller will either cycle the out-
door-fan motors or operate them at reduced speed to maintain
the unit operation, depending on the model.
Motormaster controller allows cooling operation down to
–20°F (–29°C) ambient conditions.
Roof Curb (14-in./356 mm or 24-in./610 mm) — Full
perimeter roof curb with exhaust capability provides sepa-
rate air streams for energy recovery from the exhaust air
without supply air contamination.
Horizontal Roof Curb Adapter (Vertical to Horizon-
tal Airflow) — Horizontal Roof Curb Adapters —
Used when horizontal supply and/or return is desired. Motor
Status Indicator Accessory – monitors wheel, supply and
exhaust motors and provides indication if not operating. Filter
status indicator accessory – monitors static pressure across sup-
ply and exhaust filters and provides indication when filters
become clogged.
OPTIONS AND ACCESSORIES (cont)
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