Line reactors are provided as an option for fans
with a VFD that help reduce harmonic distortion. On
25-50 ton units to ensure continuous operation, the
supply fan has an option for a redundant VFD. This
VFD is enabled in case of failure of the primary VFD.
On 60-80 ton units, to ensure continuous operation
dual supply fans have an option for dual VFD's.
These VFD's are supplied to independently operate
the two supply fan motors. A shaft grounding ring
is an option available with the unit to protect motor
bearings by diverting motor bearing currents safely
to the ground.
Fan spring isolation
1 in. spring, 2 in. spring, and seismic spring fan
isolation are available as an option to prevent
vibration transmission from the unit’s fans to the
building.
Energy recovery wheel
The unit is provided with a single speed and
variable speed energy recovery wheel (ERW)
option. Operating costs are reduced significantly
by transferring energy from the exiting exhaust
air to the entering outside air, thereby reducing
the cooling load of the unit. Freeze protection is
available as standard for all ERWs. The wheel is
specially designed to slide out of the unit for easy
maintenance of wheel segments.
Controls
Rooftop unit controller
The unit is supplied with a factory commissioned,
configured, and run tested Applied Smart
Equipment controller. The unit controller is easily
compatible with all Smart Equipment platforms.
The software and user programmed setpoints
are stored in nonvolatile memory for the 20-year
expected life of the microprocessor. The real time
clock (RTC) information is retained for a minimum of
72 hours during power loss with a super capacitor-
backed circuit.
The unit ships with a USB drive installed in the port
on the main control board, which is used to capture
all trend data and start-up wizard results. This USB
drive should remain in the main control board.
The unit controller is accompanied with an organic
light-emitting diode (OLED) display that provides
a 5 row × 35 character display. The display is a
simplified design, making it easy to understand.
Specific keys are individually assigned for quick
selections. An optional color wide screen, thin
film transistor (TFT) with multitouch capacitive
touchscreen and 1280 × 800 resolution is also
available to order factory installed or to field install.
The user interface display along with all VFD
displays are located in the control cabinet section.
When cabinet and control panel sizes allow, the
display mounted panel can be adjusted according to
the height preference of the operator.
BACnet
®
/Modbus
™
/N2/Customer
terminal board
Using the standard Applied Smart Equipment
controller, the unit can be adapted to operate
with any building automation system (BAS) that
is BACnet, Modbus, or N2 compatible, making it
the most flexible commercial rooftop unit on the
market.
For BACnet IP integration, an optional BACnet IP
interface board is available during unit selection.
Indoor air quality
Indoor air quality
Outside air economizers provide energy savings
in free cooling mode and can provide a healthier
and more comfortable building environment by
introducing fresh outside air into the building
as needed. Dry bulb, single, or dual enthalpy
economizer options are provided with the unit. Fault
detection and diagnostics (FDD) monitoring and
alarms are a standard feature with the economizer
to meet ASHRAE 90.1-2019 and California Title
24-2016 standards.
Optional airflow measurement is provided for
accurate tracking of air quantity and alerting
the occupants or building owner to unhealthy
situations. Low and ultra-low leak dampers are
provided as an option to meet application specific
requirements.
Double wall construction
The unit incorporates foam-injected double wall
construction for maximum rigidity as standard on
all units. Double wall construction of the roof, floor,
doors, and walls prevents insulation from entering
the conditioned air. The inner liner also facilitates
periodic cleaning of the unit to prevent harmful
buildup of bacteria or contaminants.
Demand control ventilation
To improve IAQ and help manage indoor
pollutants,such as carbon dioxide (CO
2
) or other
harmful airborne contaminates, out of the occupied
spaces for maximum comfort and safety, the unit
is provided with built-in sequences for demand
control ventilation (DCV).
Tempmaster
®
Omni™ Premier 25 Ton to 80 Ton Rooftop Units Installation and Maintenance Guide
18
Tempmaster
