Furnish and install Model PvV Electronic VAV diffusers as manufactured by Anemostat with sizes and capacities as shown on plans.  The diffuser(s) shall maintain room temperature set point by varying the air volume into the space.  The VAV diffusers shall include an electronic actuator that responds immediately to demands from the electronic wall controller.  The use of thermal/wax expansion components are not acceptable. One or more VAV diffusers may daisy-chained to a single wall controller and operate in unison.

The diffuser sizes shall be nominal 24” x 24 plaque type with square appearance panel and be constructed of (Steel)(Aluminum)(304 Stainless Steel), and shall be designed to integrate with the specified ceiling system type. The diffuser shall consist of a back pan and a removable, heavy gauge appearance panel attached to the back pan via (4) positive locking posts.  The appearance panel shall have aerodynamic, rigid, hemmed edges around the perimeter and shall be a single piece construction.  The panel shall be flat, smooth, and shall be free of any welding or forming blemishes.  The horizontal air discharge pattern shall be 360° type. Blank-off baffles shall be provided to obtain 1,2,or 3 way blow patterns as scheduled. 

Diffuser finish shall be (Arctic White powder coat)(Satin polish finish-stainless only)(Color as selected by the Architect).

The control system shall be electronic and use 24vac power.  The wall controller shall be located in the occupied zone and monitor the occupied zone temperature.  Systems using ceiling or diffuser mounted room temperature sensors are not acceptable.  The wall controller shall communicate with one or more diffusers to regulate the air flow into the space to maintain the occupied zone temperature set point.  Set point adjustments shall be made without the use of tools or ladders.

The electronic wall controller shall have an LCD digital display with up-down buttons to allow the user to adjust the room temperature set point, minimum damper position for ventilation air, VAV proportional band, Integral time, dead band differential, setback temperature, auto heating-cooling change-over temperature, SI-IP units, and display blanking.  A 0-10vdc analog output shall control auxiliary heat as applicable.  Settings are retained in wall controller during power loss.

The VAV modulating diffuser shall include a proportional actuator-damper assembly to precisely position the damper based on room temperature.  Floating control type positioning is not acceptable. The actuator-damper assembly shall include anti-jitter circuitry that significantly reduces hunting and needless wear on components. Actuators are self-calibrating and stop in place upon loss of power.

Model PvV-C
Master diffuser and wall controller pair, Model PvV-C, shall provide VAV cooling capability, with adjustments made at the wall mounted controller.  Interconnecting plenum control / signal cable shall be provided by the diffuser manufacturer for field installation.  Connections to the diffusers shall be RJ-12 modular plugs.

Model PvV-HC
Master diffuser and wall controller pair, Model PvV-HC, shall provide VAV cooling & VAV heating capability, with adjustments made at the wall mounted controller.  Interconnecting plenum control / signal cable and duct temperature sensor shall be provided by the diffuser manufacturer for field installation.  Connections to the diffusers shall be RJ-12 modular plugs.

Model PvV-D
Drone diffusers, Model PvV-D, shall be connected to the master diffuser via interconnecting cables, and shall operate in unison with the master diffuser.  Up to (5) drone diffusers may be connected to the master diffuser.  The master diffuser operation will dictate the control function of the connected drone diffusers.   Interconnecting plenum control / signal cables shall be provided by the diffuser manufacturer for field installation.  Connections to the diffusers shall be RJ-12 modular plugs.

Pressure Relief Ring (Option)
A pressure relief ring, Model PvV-RR, shall be field installed onto the VAV diffuser collar to relieve pressure into the ceiling plenum return as diffusers modulate.

Power Module (Option)
A 24vac power supply module, Model PvV-24, shall be provided to power up to (12) PvV diffusers. The power module shall connect to the diffuser loop and provide 24vac necessary for all diffusers in the loop including the wall controller.  Connections from the power module to diffusers are via RJ-12 modular plugs.

BACnet Interface (Option)
A direct digital controller shall be provided to interface the VAV diffuser loops to the BACnet BMS system.  The native BACnet MS/TP controller shall provide precise monitoring and control of connected points. EIA-485 communications via the MS/TP network shall allow monitoring of data including input and output values associated with the control system.

Pressure Control Air Terminals 
Furnish and install air terminals, Model EZT or Model XAFT, as manufactured by Anemostat with the sizes and capacities as shown on the plans.  Terminals shall be fitted with controls to maintain duct pressure as scheduled.

Model EZTS
http://anemostat-hvac.com/literature/ezt.rtf

Model XAFT
http://anemostat-hvac.com/literature/xaft.rtf