Project Name
Project Number
UEPH Complex
Statement of Work
26 November 2001
condensation. Auxiliary drain pans to catch drips from control and piping packages, eliminating
insulation of the packages, may be plastic; if metal, the auxiliary pans shall comply with the
requirements specified above. Insulation at control and piping connections thereto shall extend
1 inch minimum over the auxiliary drain pan. Filters shall be of the fiberglass disposable type, 1
inch thick. Filters in each unit shall be removable without the use of tools. Motors shall be of the
permanent split-capacitor type with built-in thermal overload protection, directly connected to
unit fans. Motor switch shall be two or three speeds. In lieu of the above fan speed control, a
solid-state variable-speed controller having a minimum speed reduction of 50 percent may be
provided. Motors shall have permanently-lubricated or oilable sleeve-type or combination ball
and sleeve-type bearings with vibration isolating mountings suitable for continuous duty.
10-6.2
Variable air volume terminal unit. Units shall be pressure independent type. Unit
enclosures shall be constructed of galvanized steel not lighter than 22 gauge or aluminum sheet
not lighter than 18 gauge. Units shall be internally insulated with factory mounted controls. Unit
air volume shall be factory preset and readily field adjustable without special tools. Heating
coils shall be provided. Filters shall be provided when air is recirculated. Acoustic performance
of the terminal units shall be based upon units tested according to ARI 880. Acoustical lining
shall be according to NFPA 90A.
10-6.2.1 Constant volume type. Terminal units shall contain within the casing, a mechanical
or pneumatic constant volume regulator. Volume regulators shall control air delivery to within
plus or minus 5 percent of specified air flow subjected to inlet pressure from 3/4 to 6 inch water
gauge.
10-6.2.2 Variable volume type. Terminal units shall be provided with a calibrated air volume
sensing device, air valve or damper, actuator, and accessory relays. Units shall control air
volume to within plus or minus 5 percent of each air set point volume as determined by the
thermostat with variations in inlet pressures from 3/4 to 6 inch water gauge. Internal resistance
of units shall not exceed 0.4 inch water gauge at maximum flow range. External differential
pressure taps separate from the control pressure taps shall be provided for air flow
measurement with a 0 to 1 inch water gauge range. Unit volume controller shall be normally
[open] [closed] upon loss of pneumatic pressure.
10-6.2.3 Fan-powered type. Terminal units shall be provided with a calibrated air volume
sensing device, air valve or damper, actuator, fan and motor, and accessory relays. Units shall
control primary air volume to within plus or minus 5 percent of each air set point as determined
by the thermostat with variations in inlet pressure from 3/4 to 6 inch water gauge. Unit fan shall
be centrifugal, direct-driven, double-inlet type with forward curved blades. Fan motor shall be
either single speed with speed controller or three-speed, permanently lubricated, permanent
split-capacitor type. Fan/motor assembly shall be isolated from the casing to minimize vibration
transmission. Fan control shall be factory furnished and wired into the unit control system. A
factory-mounted pressure switch shall be furnished to operate the unit fan whenever pressure
exists at the unit primary air inlet or when the control system fan operates.
10-6.3
Dual duct terminal unit. Unit enclosures shall be constructed of galvanized steel not
lighter than 22 gauge or aluminum sheet not lighter than 18 gauge. Units shall be internally
insulated with factory mounted controls. Units shall be provided with hot and cold inlet valve or
dampers. Dampers shall be controlled in unison by single or dual actuators. Unit shall control
delivered air volumes within plus or minus 5 percent with inlet air variations from 1 to 8 inch
water gauge in either duct. Mixing baffles shall be included with the unit casing. Cabinet and
SOW-133
Previous Page
