Bryant Preferred Series, Руководство пользователя, Страница: 64 / 68

64
r. Actuator shall be direct coupled to economizer
gear. No linkage arms or control rods shall be
acceptable.
s. Economizer controller shall provide indications
when in free cooling mode, in the DCV mode,
or the exhaust fan contact is closed.
5. Two-Position Damper
a. Damper shall be a Two-Position Damper.
Damper travel shall be from the full closed
position to the field adjustable %–open setpoint.
b. Damper shall include adjustable damper travel
from 25% to 100% (full open).
c. Damper shall include single or dual blade, gear
driven dampers and actuator motor.
d. Actuator shall be direct coupled to damper gear.
No linkage arms or control rods shall be accept-
able.
e. Damper will admit up to 100% outdoor air for
applicable rooftop units.
f. Damper shall close upon indoor (evaporator)
fan shutoff and/or loss of power.
g. The damper actuator shall plug into the rooftop
unit’s wiring harness plug. No hard wiring shall
be required.
h. Outside air hood shall include aluminum water
entrainment filter.
6. Manual damper
a. Manual damper package shall consist of
damper, air inlet screen, and rain hood which
can be preset to admit up to 25% outdoor air for
year round ventilation.
7. Perfect Humidity ™ Adaptive Dehumidification
System:
a. The Perfect Humidity Adaptive Dehumidifica-
tion System shall be factory-installed and shall
provide greater dehumidification of the occu-
pied space by two modes of dehumidification
operations in addition to its normal design cool-
ing mode:
1) Subcooling mode further sub cools the hot
liquid refrigerant leaving the condenser coil
when both temperature and humidity in the
space are not satisfied.
2) Hot gas reheat mode shall mix a portion of
the hot gas from the discharge of the com-
pressor with the hot liquid refrigerant leav-
ing the condenser coil to create a two-phase
heat transfer in the system, resulting in a
neutral leaving air temperature when only
humidity in the space is not satisfied.
3) Includes head pressure controller.
8. Head Pressure Control Package (Motormaster ® )
a. Controller shall control coil head pressure by
condenser-fan speed modulation or condenser-
fan cycling and wind baffles.
b. Shall consist of solid-state control and con-
denser-coil temperature sensor to maintain con-
densing temperature at outdoor ambient
temperatures between 90°F (32°C) and 110°F
(43°C) at outdoor ambient temperatures down
to 0°F (–18°C).
9. Low Ambient Controller (Factory-installed only)
a. Controller shall control coil head pressure by
condenser-fan speed modulation or condenser-
fan cycling and wind baffles.
b. Shall consist of solid-state control and con-
denser-coil temperature sensor to maintain con-
densing temperature between 90°F (32°C) and
110°F (43°C) at outdoor ambient temperatures
down to 0°F (–18°C).
10. Propane Conversion Kit
Package shall contain all the necessary hardware
and instructions to convert a standard natural gas
unit for use with liquefied propane. Kits shall be
available for elevations from 0 up to 14,000 ft
(4,276 m).
11. Condenser Coil Hail Guard Assembly:
a. Shall protect against damage from hail.
b. Shall be of louvered style.
12. Unit-Mounted, Non-Fused Disconnect Switch:
a. Switch shall be factory-installed, internally
mounted.
b. National Electric Code (NEC) and UL or ETL
approved non-fused switch shall provide unit
power shutoff.
c. Shall be accessible from outside the unit.
d. Shall provide local shutdown and lockout capa-
bility.
e. Sized only for the unit as ordered from the fac-
tory. Does not accommodate field-installed
devices.
13. Convenience outlet:
a. Powered convenience outlet. (Not available on
single phase models):
1) Outlet shall be powered from main line
power to the rooftop unit.
2) Outlet shall be powered from line side or
load side of disconnect by installing con-
tractor, as required by code. If outlet is
powered from load side of disconnect, unit
electrical ratings shall be UL certified and
rated for additional outlet amperage.
3) Outlet shall be factory-installed and inter-
nally mounted with easily accessible 115-v
female receptacle.
4) Outlet shall include 15 amp GFI recepta-
cles with independent fuse protection.
5) Voltage required to operate convenience
outlet shall be provided by a factory-
installed step down transformer.
6) Outlet shall be accessible from outside the
unit.
7) Outlet shall include a field-installed “Wet
in Use” cover.
GUIDE SPECIFICATIONS (cont)