Variable air volume units shall be equipped with a supply fan VFD. The VFD shall
control motor speed to maintain set point static pressure control at the supply duct
sensor tube location. The supply fan drive shall be field-adjustable to maintain supply
duct static pressure set point from 0.0-in. wg to 5-in. wg, adjusted via scrolling
marquee display or Navigator™ display. A pressure transducer shall be factory-
mounted and wired. (Control tubing from sensor tube location to transducer shall be
field-supplied and installed.) Transducer shall provide a 4 to 20 mA signal to the unit
control module; unit control module shall provide a 4 to 20 mA signal to the VFD
indicating desired VFD output level.
23. Staged Air Volume (SAV) units:
Staged air volume units shall be equipped with a supply fan VFD. The VFD shall
control motor speed to user-configurable speeds. High speed shall be a percentage
of 60 Hz, and shall be user configurable. The range of adjustment for high speed
shall be between 50 and 100% of 60 Hz. Low speed shall be a percentage of 60 Hz,
and shall be user configurable. The range of adjustment for low speed shall be
between 33 and 67% of 60 Hz. The control shall allow user-configurable fan speeds
for cooling and heating modes.
24. [SCR Controlled Electric Heat:]
a. SCR electric heat option shall monitor unit supply-air temperature and control the
unit heater section to provide the following sequences:
1) Demand heating control, with modulation to maintain user-configured heating
supply air temperature set point.
2) Full output heating on heating control command.
3) Tempering heat control, based on user-configured ventilation supply air
temperature set point, to eliminate cold draft conditions with low mixed-air
temperatures.
b. SCR heat control option shall consist of:
1) SCR controller capable of ensuring the proper heating rates.
2) Supply air temperature thermistors with duct-mounting base.
3) Limit switch temperature thermistors.
c. Field installation shall be limited to installing three supply air temperature
thermistors in the supply duct. All other hardware and wiring shall be factory-
completed.
25. Discharge Plenum:
Discharge plenum design shall contain added length module for bottom supply air
discharge, as shown in contract drawings. Discharge plenum design shall provide
horizontal discharge arrangement supply fan which shall discharge into insulated
plenum. Interior cabinet surfaces within discharge plenum section shall be lined with
sheet metal on all surfaces, insulated on the side opposite the airstream. Electric
heat is not available with discharge plenum models.
26. Blank Section:
A 4 ft or 8 ft blank section shall be available for field installation of field-supplied
devices.
27. Extended Chassis:
Extended chassis designs shall contain an added length module, after the evaporator
section, as shown in the contract drawings. Module shall contain tracks to accept
field-supplied/installed auxiliary heating coil.
28. Agion
® Interior:
Interior panels shall be pre-coated with a silver zeolite antimicrobial material
registered by the US EPA for use in HVAC applications.
29. Split Unit:
The unit shall be available for shipment in two sections dependent upon the options
selected.
30. UV-C Germicidal Lamps:
Emitters and fixtures for UV-C lamps shall be designed for use inside an HVAC
system and shall be covered by a 1-year warranty. Individual lamp output shall be
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