Bryant 549B - Manual (Page 138)

138
GUIDE SPECIFICATIONS — 549B036-120, 549C024-060 (cont)
* 5. 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.
* 6. 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.
7. 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.
* 8. 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.
* 9. Thermostat and Subbase:
Thermostat shall provide staged cooling and heating
automatic (or manual) changeover, fan control, and
indicator light.
* 10. Outdoor Coil Hail Guard Assembly:
Hail guard shall protect against damage from hail
and flying debris.
11. Unit-Mounted, Non-Fused Disconnect Switch:
Switch shall be factory-installed, internally mounted.
NEC and UL approved non-fused switch shall pro-
vide unit power shutoff. Switch shall be accessible
from outside the unit and shall provide power off
lockout capability.
12. Convenience Outlet:
Switch shall be factory-installed and internally
mounted with easily accessible 115-v female recep-
tacle. Switch 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. Switch shall
be accessible from outside the unit.
NOTE: Convenience outlet shall be designed for
short duration electrical maintenance loads, and for
use with long term electrical supply.
13. Outdoor Coil Grille:
The grille protects the outdoor coil from damage by
large objects without increasing unit clearances.
14. Compressor Cycle Delay:
Unit shall be prevented from restarting for minimum
of 5 minutes after shutdown.
15. Thru-the-Bottom Utility Connectors:
Kit shall provide connectors to permit electrical con-
nections to be brought to the unit through the
basepan.
16. 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.
17. Power Exhaust Accessory for EconoMi$erIV or
EconoMi$er2:
Power exhaust shall be used in conjunction with
EconoMi$erIV or EconoMi$er2 to provide system
exhaust of up to 100% of return air (vertical only).
The power exhaust is a field-installed accessory
(separate vertical and horizontal design).
NOTE: Horizontal power exhaust is intended to
mount in return ductwork.
As the outdoor-air damper opens and closes, both
propeller fans are energized and de-energized
through the EconoMi$erIV controller. The set point is
factory set at 100% of outdoor-air, and is adjustable
0 to 100% to meet specific job requirements. Avail-
able in 208/230-1-60 v or 460-3-60 v. An LED light
on the controller indicates when the power exhaust
is operating.
For the EconoMi$er2, the power exhaust shall be
controlled by the third party controls.
18. 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 con-troller to determine if outside air is
suitable for free cooling.
19. 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.
20. 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.
21. Outdoor Air/Return Air Temperature Sensor (adjust-
able) (EconoMi$er2):
Optional sensor uses a third party control to control
outdoor air damper and compressor operation.
22. Indoor Air Quality (CO
2
) Sensor (EconoMi$er2):
a. Shall have the ability to provide demand ventila-
tion indoor air quality (IAQ) control through the
EconoMi$er2 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.
549B
, 549
C