Guide Specifications:

Single Duct VAV Retro-fit Terminal Unit
HVAC Guide Specifications
Size Range: 90 to 3660 Nominal CFM
Krueger Model Number RVE 

Part 1- General

1.01	DELIVERY AND STORAGE:
Units shall be stored and handled per manufacturer’s recommendations.

1.02 QUALITY ASSURANCE:
A.	Insulation shall meet NFPA-90A requirements for flame spread and smoke generation and UL-181 requirements for anti-erosion, corrosion and fungus properties.
B.	Sound power levels shall be determined in accordance with the requirements of ARI-880-98.

1.03 DELIVERY AND STORAGE:
Units shall be stored and handled per manufacturer's recommendations.

Part 2 – Products

2.01 Equipment

A.	General:
Factory-assembled, externally powered, variable air volume control terminal. Unit shall be complete with a damper assembly, flow sensor, externally mounted volume controller, collars for duct connection and all required features. Control box shall be clearly marked with an identification label that lists such information as nominal cfm, maximum and minimum airflow limits, coil type and coil hand, where applicable

B.	Unit Cabinet:
Constructed of 22-gage (20 gage optional) galvanized steel (304 Stainless optional) with round inlet and discharge collar. All primary air inlet and discharge collars shall accommodate standard flex duct sizes. Unit is not insulated.

C.	Damper Assembly:
The control air damper assembly shall be constructed of heavy gauge galvanized steel with solid shaft rotating in Delrin® bearings. Damper shaft shall be marked on the end to indicate damper position. Damper blade shall incorporate a flexible gasket for tight airflow shutoff and operate over a full 90°.

D.	Controls:
Units shall have pressure-independent pneumatic, electronic, or communicating controls, as specified, capable of maintaining required airflow set points +/-5% of the unit’s capacity at any inlet pressure up to 6-in. wg. The controllers shall be capable of resetting between factory or field-set maximum and minimum (>350 fpm inlet duct velocity) set points to satisfy the room thermostat demand.
The unit shall be equipped with an amplified flow probe located in the unit inlet. Air flow for the pressure independent controller (supplied by others) shall be determined with a factory supplied 12 point total pressure, center averaging cross flow sensor, having a magnification resulting in no greater than 2625 fpm @ 1” developed signal.

E:   Performance:

1.	The pressure drop through the units shall not exceed scheduled values, including hot water coils. 

2.	Acoustical Requirement

2.1	Unit supplied shall be rated in accordance with ARI 880 certification program at the rated flow rates and pressures. The unit manufacturer shall furnish octave band sound power data for both casing radiated and discharge sound levels with the selected lining and above flow sensor, as tested per ARI Industry Standard 880-98, at the required flow rates and inlet pressures.  Both Discharge and Radiated sound data shall result in room Sound Pressure levels not to exceed those listed below, with a tolerance of + 2 dB in any band for less than 20% of the units, when determined in accordance with ARI 885-98 Appendix E with the following listed assumptions:

2.2	Desired Room Sound Pressure level, dB by Octave Band:
Sound Criteria 		: High Speech Privacy
Octave  Band 		:      2     3     4     5    6    7 
          Room Sound Pressure 	:    57   53   48   43   37   31

2.3	Application Assumptions
Nominal Duct Size = 12.        Nominal Duct Ps = 1.0.

 ----- Discharge Sound Assumptions ------ 
  Sound Power Division based on 2 Power Splits
  5 Ft. of Lined Duct
  5 feet of 8" Flexible duct   
  End Reflection based on a 10" round duct.

Room Absorption based on a  2400 CuFt room,  5 Ft from the source:              
             Octave Band    	:    2    3    4    5    6    7   
     Room Effect, dB       	:    5    7    8    9   10   11

 ------ Radiated Sound Assumptions --------
ARI 885-98 assumes that ceiling located sound sources are not point, but area sources, and the room attenuation is included in the ceiling/space effect, based on the ceiling tile selected.

    Ceiling: ARI 885-98 Type 2, 10 pcf Mineral Tile
              Octave  Band   	:    2      3     4     5     6     7                       
      Total Space Effect   	:   15   17   19   25   30   33

2.4	Maximum Allowable Sound Power 
Based  on the assumptions in section 2.3 above, neither  Radiated or  Discharge Unit sound power shall exceed the following levels at an inlet pressure of 1.0" w.g.:         
            Octave  Band       :    2      3     4     5     6    7    
       Radiated Pwl    ,dB   :   74   71   67   68   67   64
       Discharge Pwl   ,dB  :    79  78   82   90   87   65