Bryant 549B - Manual (Page 161)

161
GUIDE SPECIFICATIONS — 542J150,180 (cont)
5. Manual Outdoor-Air Damper:
Manual damper package shall consist of damper,
birdscreen, and rainhood which can be preset to
admit up to 50% outdoor air for year round
ventilation.
* 6. 25% Two-Position Damper:
a. Two-position damper package shall include single
blade damper and motor. Admits up to 25%
outdoor air.
b. Damper shall close upon indoor fan shutoff.
* 7. Head Pressure Control Package:
Control package shall consist of solid-state control
and condenser-coil temperature sensor to maintain
condensing temperature between 90 F and 110 F at
outdoor ambient temperatures down to –20 F by
condenser-fan speed modulation or condenser-fan
cycling and wind baffles.
8. Electric Resistance Heaters:
a. Open wire nichrome elements with all necessary
safety operating controls.
b. UL listed and indicated on basic unit information
plate.
c. Available in multiples to match heating
requirements.
d. Single point kits available for each heater when
required.
* 9. Electronic Programmable Thermostat:
Unit shall be capable of using deluxe full-featured
electronic thermostat. Thermostat shall use built-in
compressor cycle delay control for both heating and
cooling duty. Thermostat shall be capable of working
with third party direct digital controls.
* 10. Thermostat and Subbase:
Thermostat and subbase shall provide staged cool-
ing and heating automatic (or manual) changeover,
fan control, and indicator light.
11. Convenience Outlet:
Outlet shall be factory-installed and internally
mounted with easily accessible 115-v female recep-
tacle. Outlet shall include 15 amp GFI receptacle
with independent fuse protection. Voltage required to
operate convenience outlet shall be provided by a
factory-installed step-down transformer. Outlet shall
be accessible from outside the unit.
12. Compressor Cycle Delay:
Unit shall be prevented from restarting for minimum
of 5 minutes after shutdown.
13. Fan/Filter Status Switch:
Switch shall provide status of indoor (evaporator) fan
(ON/OFF) or filter (CLEAN/DIRTY). Status shall be
displayed over communication bus when used with
direct digital controls or with an indicator light at the
thermostat.
14. Power Exhaust:
Package shall include an exhaust (propeller style)
fan,
1 /
2
Hp 208-230, 460 v (factory-wired for 460 v)
direct drive motor, and damper for vertical flow units
with economizer to control over-pressurization of
building. Power Exhaust package must be field-
installed in return-air ductwork when used with
optional side return connections.
15. Outdoor Air Enthalpy Sensor (EconoMi$erIV or
EconoMi$er2):
The outdoor air enthalpy sensor shall be used with
the EconoMi$erIV or EconoMi$er2 device to provide
single enthalpy control. When used in conjunction
with a return air enthalpy sensor, the controller will
provide differential enthalpy control. The sensor
allows the controller to determine if outside air is
suitable for free cooling.
16. Return Air Enthalpy Sensor (EconoMi$erIV or
EconoMi$er2):
The return air enthalpy sensor shall be used with the
EconoMi$erIV or EconoMi$er2 device. When used
in conjunction with an outdoor air enthalpy sensor,
the EconoMi$erIV or EconoMi$er2 device will pro-
vide differential enthalpy control.
17. Return Air Temperature Sensor (EconoMi$erIV or
EconoMi$er2):
The return air temperature sensor shall be used with
the EconoMi$erIV or EconoMi$er2 device. When
used in conjunction with the standard outdoor air
temperature sensor, the EconoMi$erIV or
EconoMi$er2 device will provide differential temper-
ature control.
18. Indoor Air Quality (CO
2
) Sensor (EconoMi$er2):
a. Shall have the ability to provide demand ventila-
tion indoor air quality (IAQ) control through the
economizer with an IAQ sensor.
b. The IAQ sensor shall be available in duct mount,
wall mount, and wall mount with LED display. The
set point shall have adjustment capability.
19. Indoor Air Quality (CO
2
) Room Sensor
(EconoMi$erIV):
Sensor shall have the ability to provide demand ven-
tilation control through the EconoMi$erIV. The IAQ
sensor shall be wall mounted with an LED display in
parts per million. The set point shall have adjustment
capability.
20. Return Air CO
2
Sensor (EconoMi$erIV):
Sensor shall have the ability to provide demand ven-
tilation control through the EconoMi$erIV. The IAQ
sensor shall be duct mounted. The set point shall
have adjustment capability.
21. Ultra-Violet Germicidal Lamps:
Ultra-violet germicidal lamps are designed to elimi-
nate odor causing mold and fungus that may
develop in the wet area of the indoor section of the
unit. The high output, low temperature germicidal
lamps are field installed in the indoor section of the
unit, aimed at the indoor coil and condensate pan.
The short wavelength ultra-violet light inhibits and
kills mold, fungus and microbial growth. The lamps
have an output rating at 45 F in 400 fpm airflow
of 120 microwatts/cm
2 at 1 meter.
22. Hinged Panel Option:
Hinged panel option provide hinged access panels
for the filter, compressor, indoor fan, and control box
areas. Filter hinged panels permit tool-less entry for
changing filters. Each hinged panel is permanently
attached to the rooftop unit.
23. Emergency Heat Control Package:
When mechanical heating is locked out, auxiliary
heat shall be activated when necessary.
5
42J