TempMaster OmniElite - Page 70

TEMPMASTER
70
FORM TPM3-EG1 (518)
Economizer Type
[SELECT NONE OR ONE OF THE FOLLOWING]
1. No Outside Air: The unit has no provisions for outside ventilation air.
2. Manual Outside Air (OA) Damper: A manually adjustable OA damper capable of
admitting 0–25% outside air shall be provided.
3. Two-Position Outside Air (OA) Damper: A two-position OA damper capable of ad-
mitting 0–25% outside air shall be provided. The minimum position shall be manu-
ally adjustable from 0–25%. Control shall be based on the occupied mode of the
unit. For occupied mode, the damper shall be open to the minimum position and for
unoccupied, it shall be closed.
4. Modulating Economizer: The economizer segment shall be designed to use out-
side air for cooling and ventilation and provide a means of exhausting air from the
air handling unit. The segment shall consist of parallel acting low-leak dampers.
The return air (RA), OA, and exhaust air (EA) dampers shall be sized for 100% of
nominal unit airow. The EA damper assembly shall have a factory-assembled rain
hood. The rain hood shall have a drip-lip the full width of the hood to channel mois-
ture away from the air being drawn into the unit.
Economizer Leakage
[SELECT ONE OF THE FOLLOWING]
1. Damper assemblies are low-leak design. Damper blades are fabricated from a mini-
mum of 16-gauge galvanized steel. Blade edges are covered with vinyl seals.
2. Damper assemblies have a maximum leakage rate of 10 CFM/sq. ft. at 1-inch wa-
ter column (w.c.) when tested in accordance with AMCA Standard 500 and have a
longevity of 60,000 damper opening and closing cycles, complying with the require-
ments of California Title 24.
[SELECT ONE OF THE FOLLOWING TYPES OF BUILDING PRESSURE CONTROL]
1. No Building Exhaust/Relief: The unit has no provisions to exhaust building return air.
2. Barometric Relief Damper: Building air exhaust shall be accomplished through
barometric relief dampers installed in the return plenum. The dampers open relative
to the building pressure. The opening pressure shall be adjustable.
3. On/Off Fan Powered Exhaust: A double width, double inlet (DWDI) Class II for-
ward-curved centrifugal exhaust fan shall be provided to exhaust building return air
to relieve building static pressure. The fans shall be constant volume and operate
based on either a building static pressure or OA damper position.
4. Powered Exhaust with Modulating Discharge Damper: A DWDI Class II forward-
curved centrifugal exhaust fan shall be provided to exhaust building return air to
relieve building static pressure. The fans shall operate at a constant volume and
operate based on building static pressure. Exhaust airow shall be modulated via
a parallel-acting control damper. The EA dampers shall be sized for 100% of the
exhaust airow.
5. Powered Exhaust with Variable Frequency Drive (VFD): A twin DWDI Class II
forward-curved centrifugal exhaust fan shall be provided to exhaust building re-
turn air to relieve building static pressure. Exhaust airow shall be modulated via a
factory installed and commissioned variable frequency drive (VFD) with the same
nameplate horsepower as the supply fan motor.
Guide Specifications (Cont'd)