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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.
3. Two-Position Damper (Factory-installed on
3-Phase 04-06 Models Only. Field-installed on all
3 and 1 Phase Models):
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
acceptable.
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.
4. Manual damper (Field-installed only):
a. Manual damper package shall consist of
damper, air inlet screen, and rain hood which
can be preset to admit up to 25 or 50% outdoor
air for year round ventilation.
5. Perfect Humidity™ Dehumidification System
(3 Phase Models Only):
a. The Perfect Humidity Dehumidification System
shall be factory installed and shall provide
greater dehumidification of the occupied space
by two modes of dehumidification operations in
addition to its normal design cooling 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 low ambient controller.
6. Low Ambient Control Package:
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 –20°F (–29°C).
7. Propane Conversion Kit:
a. Package shall contain all the necessary hard-
ware and instructions to convert a standard nat-
ural gas unit for use with liquefied propane, up
to 2000 ft (610m) elevation.
b. Additional accessory kits may be required for
applications above 2000 ft (610m) elevation.
8. Flue Shield:
a. Flue shield shall provide protection from the hot
sides of the gas flue hood.
9. Condenser Coil Hail Guard Assembly (Factory-
installed on 3 Phase Models Only. Field-installed
on all 3 and 1 Phase Models):
a. Shall protect against damage from hail.
b. Shall be either hood style or louvered.
10. Unit-Mounted, Non-Fused Disconnect Switch
(Available on units with MOCPs of 80 amps or
less):
a. Switch shall be factory installed, internally
mounted.
b. National Electric Code (NEC) and UL approved
non-fused switch shall provide unit power shutoff.
c. Shall be accessible from outside the unit.
d. Shall provide local shutdown and lockout
capability.
e. Sized only for the unit as ordered from the fac-
tory. Does not accommodate field-installed
devices.
11. Convenience Outlet:
a. Powered convenience outlet.
(3 Phase Models Only):
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)
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