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RT-PRC031-EN 97
Options
with VAV air handlers to control
duct static pressure. Option
includes vanes and static
pressure controls. Airfoil supply
fans with inlet vanes are an
efficient way to mechanically
modulate airflow.
• VAV Supply Air Temperature
Control with Variable Frequency
Drives w/o Bypass—Provided
with all necessary controls to
operate a VAV air handler from
the discharge air temperature,
including discharge air
microprocessor controller and
discharge air sensor. The
microprocessor controller
coordinates the economizer
control and the stages of cooling
with discharge air temperature
reset capabilities. Includes
factory installed and tested
variable frequency drives (VFD)
to provide supply fan motor
speed modulation. VFD receives
0-10 vdc from the unit
microprocessor based upon
supply static pressure and
causes the drive to accelerate or
decelerate as required to
maintain the supply static
pressure setpoint.
• VAV Supply Air Temperature
Control with Variable Frequency
Drives and Bypass—Bypass
control provides full nominal
airflow in the event of drive
failure.
Agency Approval
Air Handlers can be provided with
UL/CSA approval.
Miscellaneous Options
• Marine Lights (Customer
Powered)—A 120V master light
switch is factory installed in the
main unit control box for lighting
control. The master switch is
wired into an isolated terminal
block with access for customer
provided service. Marine light
fixtures are supplied with 150W
incandescent bulbs. Marine light
fixtures are placed in the Supply
Section (2), Fresh Air Section (1),
Return Section (1), and Extended
Casing Section (1) for units
without Heat.
• Non-Fused Disconnect Switch
with External Handle—External
handle enables the operator to
disconnect unit power with the
control box door closed for
safety.
• Unit Interrupt Rating—Using a
non-fused circuit breaker for
disconnect switch purposes a
65000 Amp rating is optionally
available on 460/3/60 powered
units and a 25000 Amp rating is
available on 575/3/60 units. Fan
motors and electric heat (if
applicable) circuits are also
equipped with series rated circuit
breakers.
• GFI Convenience Outlet (Factory
Powered)—A 15A, 115V Ground
Fault Interrupter convenience
outlet is factory installed. It is
wired and powered from a
factory mounted transformer.
Unit mounted non-fused
disconnect with external handle
is furnished with factory
powered outlet.
• Economizer Control with
Comparative Enthalpy—used
with the fresh air economizer,
two enthalpy sensors are
provided to compare total heat
content of the indoor air and
outdoor air to determine the
most efficient air source when
economizing.
• Economizer Control with
Reference Enthalpy—used with
the fresh air economizer, an
outdoor enthalpy sensor is
provided to compare the total
heat content of outdoor air to a
locally adjustable setpoint. The
setpoint is programmed at the
human interface, or remote
human interface, to determine if
the outdoor enthalpy condition is
suitable for economizer
operation.
• Economizer Control with Dry
Bulb—used with the fresh air
economizer, an outdoor
temperature sensor is included
for comparing the outdoor dry
bulb temperature to a locally
adjustable temperature setpoint.
The setpoint is programmed
either at the human interface, or
remote human interface, to
determine if outdoor air
temperature is suitable for
economizer operation.
• Low Leak Dampers—Return air,
fresh air and relief air dampers
have chlorinated polyvinyl
chloride gasketing to seal to a
leakage rate of 10 cfm/ft^2
(AMCA Class 2) at 1.0 in w.g.
pressure difference.
• Ultra Low Leak Fresh Air
Dampers—Dampers have
chlorinated polyvinyl chloride
gasketing to seal to a leakage
rate of 4 cfm/ft^2 (AMCA Class 1)
at 1.0 in w.g. pressure difference.
• High Duct Temperature
Thermostats—Two manual reset
thermostats are provided with
one located in the discharge
section of the unit set at 240°F
and the other in the return
section set at 135°F. The air
handler will shut down if the
thermostats are tripped.
• High Efficiency Motors—Supply
and exhaust/return fans are
provided with high efficiency
motors.
• High Efficiency TEFC Motors—
Supply and exhaust/return fans
are provided with high efficiency
Totally Enclosed Fan Cooled
motors.
• Belt Guards—Supply and
exhaust fans can be optionally
equipped with a universal size
belt guard to accommodate any
applicable drive configuration.
The guard totally encloses the
drive system and is provided
with a two-piece removable front
panel for servicing. Return fan
guards are also available with
individually sized belt guard with
a single-piece removable panel
for servicing.
• Airflow Paths—In addition to the
traditional downflow supply and
upflow return, horizontal supply
and return is available. End
return is also available on select
units. For additional details on
airflow configuration, see
Table 1, p. 24 Table 2, p. 24
• Burglar Bars—A grate system is
available for the supply and
return air duct connection areas
on non-horizontal airflow path
units to minimize unwanted
intrusion into duct systems.
• Generic Building Automation
System (GBAS 0-5vdc) Module—