Guide Specifications:

Single Duct VAV Terminal Unit
HVAC Guide Specifications
Size Range: 90 to 7000 Nominal CFM
Krueger Model Number: LMHS
 
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.	Hot water coils, when specified, shall be tested for leakage at 250 psig with the coil submerged in water.
C.	Electric heating coils, when specified shall be UL or ETL listed and designed to comply with UL Standard 1096.
D.	Sound power levels shall be AHRI certified in accordance with the requirements of AHRI-880-11.

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:
1.	Constructed of 22-gage (20 gage optional) galvanized steel with round or rectangular inlet collar and rectangular discharge with slip and drive connection. All primary air inlet collars shall accommodate standard flex duct sizes
2.	Unit casing shall be lined with 1/2” thick, 1 1/2 lb. dual density fiberglass insulation that meets UL 181 and NFPA 90A. Insulation shall be attached to the unit casing by adhesive and weld pins. 

3.	1” THICK INSULATION: (ALTERNATIVE TO ITEM 2) Unit casing shall be lined with dual density, 1” thick, 1.5 lb. density fiberglass insulation that meets UL181 and NFPA-90A.

4.	CELLULAR INSULATION (ALTERNATIVE TO ITEM 2)  Unit casing shall be lined with 1/2” or 1” thick, 1 1/2 lb. density, smooth surface, polyolefin, closed-cell foam insulation for fiber free application. Cellular insulation meets UL 181 and NFPA 90A and does not support mold or bacteria growth. Insulation shall be attached to the unit casing by adhesive and weld pins.

5.	STERILINER INSULATION:(ALTERNATIVE TO ITEM 2) Unit casing shall be lined with 13/16” thick, 4 lb. density, rigid board insulation with nylon reinforced foil covering insulation fibers that meets UL 181 and NFPA 90A. Liner shall be attached to unit casing by adhesive and weld pins with full-seam-length Z-strips to enclose and seal the insulation cut edges.

6.	NO LINER: (ALTERNATIVE TO ITEM 2) Unit casing shall be equipped with no internal insulation liner.

7.	STERILWALL INSULATION: (ALTERNATIVE TO ITEM 2) Unit casing shall be lined with 1/2 ” thick, 1 ½ lb. density insulation, meeting UL181 and NFPA-90A, enclosed between the unit casing and a non-perforated internal sheet metal cover extending over the fiberglass insulation, as well as covering the liner cut edges. 

8.	PERFORATED DOUBLE WALL: (ALTERNATIVE TO ITEM 2) Unit casing shall be lined with 1/2”, 1 1/2 lb. dual density fiberglass insulation that meets UL 181 and NFPA 90A, enclosed between the unit casing and a perforated internal sheet metal cover extending over the fiberglass insulation, as well as covering the liner cut edges.

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.	Accessories:
1.	Hot Water Heating Coil:
Coil shall be mounted in a minimum 20 Ga. Galvanized steel casing with slip and drive discharge connections, and factory mounted on the base unit as shown on the equipment drawings. Coils shall have:
a.	Aluminum fins (10 ft/in.) bonded to the copper tubes by mechanical expansion. 
b.	Number of coil rows and circuits shall be selected to provide performance as required by the plans.
c.	Up to 4 rows as shown on equipment drawings or designed on the equipment schedule. Right or left-hand fittings with sweat connection sizes as indicated on equipment drawings. 

2.	Electric Heating Coil:
Electric coils shall be supplied by the terminal unit manufacturer and shall be UL listed. Construct coil casing with minimum of 20-gage zinc coated steel. Elements shall be nickel chrome and supported by ceramic isolators. The integral control panel shall be housed in a NEMA 1 enclosure, with access door to all controls and safety devices. Electric coils shall contain a primary automatic reset thermal cutout and differential pressure airflow switch for proof of airflow.  Heaters shall be: 
a.	Designed for the capacity, electrical characteristics and steps of control as shown on the equipment schedule
b.	Open coil construction with 80% nickel, 20% chromium wire supported in free-floating ceramic bushings. Coil frame shall be constructed of corrosion resistant steel.
c.	Factory wired and include all limit switches

(OPTIONAL) electric coils shall include fused or non-fused door interlocking disconnect switch, AC Solid State relays for silent operation, fuse block, dust tight enclosure construction, all mounted and/or wired within the control enclosure.
(OPTIONAL) LineaHeat solid state electronic proportional control of electric heat shall meet the requirements of ASHRAE Standard 62, Addenda N.  
(OPTIONAL) LineaHeat solid state electronic controlled electric heater with control of the leaving air temperature limiting the unit discharge temperature to a set value.

3.	Multiple Outlet Attenuator:
Multiple Outlet Attenuator shall be 36 in. long and factory installed on the non-attenuated base unit that is not equipped with electric heat. Refer to equipment schedule for effected units. The octopus shall be:
a.	Equipped with 6-in. or 8-in. diameter collars in the quantity and configuration specified on the equipment drawings. Each collar shall include a locking butterfly balancing damper.
b.	Insulated with -in thick, 1.5-lb. equivalent dual density or mat-faced insulation

4.	Sound Attenuator:
The integral sound attenuator section shall consist of a continuous extension of the standard zinc coated steel casing. When electric heat is required, the attenuator will be used as a standard feature.

       F: 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 AHRI 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 AHRI Industry Standard 880-11, 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 AHRI 885-08 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 --------
AHRI 885-08 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: AHRI 885-08 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