drain pans to drain. Furnish drain connection unless otherwise indicated.
Connection shall be minimum 19 mm 3/4 inch NDT or 18 mm 5/8 inch OD.
2.9.4.6
Filters
Fiberglass disposable type, 25 mm 1 inch thick, installed upstream of coil.
2.9.4.7
Dampers
Provide an outside air proportioning damper on each unit. In addition,
provide a vane to prevent excessive outside air from entering unit and to
prevent blow-through of outside air through the return air grille under
high wind pressures. Where outside air and recirculated air proportioning
dampers are provided on the unit, an additional vane will not be required.
Provide face and bypass dampers for each unit to ensure constant air volume
at all positions of the dampers. Furnish each unit with a factory
installed control cam assembly, pneumatic motor, or electric motor to
operate the face and bypass dampers and outside air damper or outside air
and recirculated air dampers in the sequence as specified in paragraph
CONTROLS.
2.9.4.8
Motors
**************************************************************************
NOTE: Edit based on whether the units are
freestanding, built-in, or both.
**************************************************************************
Motors shall be of the permanent split-capacitor type with built-in thermal
overload protection and automatic reset. Mount motor on a resilient
mounting, isolated from the casing and suitable for operation on electric
service available. A manually operated motor switch shall provide for 2 or
3 speeds and off and shall be mounted on an identified plate [inside the
unit below or behind an access door] [or] [adjacent to the room thermostat]
[as indicated]. In lieu of speed control, a solid state variable speed
controller having minimum speed reduction of 50 percent may be provided.
2.9.4.9
Outside Air Intakes
Outside air intakes shall be the manufacturer's standard design and
provided with 13 mm 1/2 inch mesh bird screen or louvers on 13 mm 1/2 inch
centers.
2.10
ENERGY RECOVERY DEVICES
2.10.1
Rotary Wheel
**************************************************************************
NOTE: Energy recovery device supply/exhaust
filters, preheat coils, backdraft dampers, exhaust
dampers, recirculation dampers, face and bypass
dampers, drainage provisions, controls and like
ancillaries will be shown on the drawings and
supplemented by the specifications as necessary.
Select minimum acceptable energy transfer
effectiveness and maximum acceptable
cross-contamination.
Delete moisture resistance and chain drive if not
SECTION 15895
Page 51
Previous Page
