17
Field-installed accessories
Filter maintenance indicator
When the optional factory-installed filter maintenance indica-
tor is used, a factory-installed differential pressure switch mea-
sures pressure drop across the outside air filter and activates a
field-supplied dry contact indicator when the pressure differen
-
tial exceeds the adjustable switch setpoint.
Condenser coil hail guard
Sleek, louvered panels protect the condenser coil from hail
damage, foreign objects, and incidental contact. This can be
purchased as a factory-installed option or as a field-installed
accessory.
Differential enthalpy sensor
The differential enthalpy sensor is comprised of an outdoor and
return air enthalpy sensors to provide differential enthalpy con
-
trol. The sensor allows the unit to determine if outside air is
suitable for free cooling.
Wall or duct mounted CO
2
sensor
The IAQ sensor shall be available in duct or wall mount. The
sensor provides demand ventilation indoor air quality (IAQ)
control.
Propane conversion kit (582K units only)
Convert your gas heat rooftop from standard natural gas opera-
tion to Propane using this field-installed kit.
High altitude conversion kit (582K units only)
High altitudes have less oxygen, which affects the fuel/air mix-
ture in heat exchangers. In order to maintain a proper fuel/air
mixture, heat exchangers operating in altitudes above 2000 ft
(610 m) require different orifices. To select the correct burner
orifices or determine the heat capacity for a high altitude applica
-
tion, use either the selection software, or the unit’s service man-
ual. High altitudes have less oxygen, which means heat
exchangers need less fuel. The new gas orifices in this field-
installed kit make the 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 (582K units only)
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.
Phase monitor protection
The Phase Monitor Control will monitor the sequence of three
phase electrical system to provide a phase reversal protection;
and monitor the three phase voltage inputs to provide a phase
loss protection for the three phase device. It will work on either
a Delta or Wye power connection.
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.
Low ambient controller
The low ambient controller is a 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 low ambient controller will either cycle the outdoor fan
motors or operate them at reduced speed to maintain the unit
operation, depending on the model. This controller allows cool
-
ing 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 with-
out supply air contamination.
Filter status indicator accessory
Monitors static pressure across supply and exhaust filters and
provides indication when filters become clogged.
Power exhaust
Superior internal building pressure control. This field-installed
accessory may eliminate the need for costly, external pressure
control fans.
Manual OA damper
Manual outdoor air dampers are an economical way to bring in
ventilation air. The dampers are available in 25% and 50%
versions.
NOTE: See application tip “ROOFTOP-18-01” prior to use of
this damper on 07 size models.
Motorized 2-position damper
The Bryant 2-position, motorized outdoor air damper admits up
to 100% outside air. Using reliable, gear-driven technology, the
2-position damper opens to allow ventilation
air and closes
when the rooftop stops, stopping unwanted infiltration.
NOTE: See application tip “ROOFTOP-18-01” prior to use of
this damper on 07 size models.
Electric heaters
Bryant offers a full-line of field-installed accessory heaters.
The heaters are very easy to use, install and are all pre-engi
-
neered and certified.
Time Guard II control circuit
This accessory protects your compressor by preventing short-
cycling in the event of some other failure, prevents the com
-
pressor from restarting for 30 seconds after stopping. Not
required with RTU Open controller or authorized commercial
thermostats.
Options and accessories (cont)
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