SECTION 15811

EVAPORATIVE HUMIDIFIERS

PART 1 GENERAL

SECTION INCLUDES

Humidifier Units.

Spray Pumps.

Piping.

PRODUCTS FURNISHED BUT NOT INSTALLED UNDER THIS SECTION

Section 15540 - HVAC Pumps: Placement of spray pumps.

PRODUCTS INSTALLED BUT NOT FURNISHED UNDER THIS SECTION

Section 15952 - Controls and Instrumentation: Placement of control valves.

Section 15545 - Chemical (Water) Treatment: Supply of solenoid valves for placement by this Section.

RELATED SECTIONS

Section 15252 - Piping and Equipment Insulation: Insulation of external piping.

Section 15290 - Ductwork Insulation: Insulation of casing.

Section 15540 - HVAC Pumps: Spray pumps.

Section 15855 - Air Handling Units with Coils: Dimensional match.

Section 15952 - Controls and Instrumentation.

REFERENCES

ANSI/UL 900 - Test Performance of Air Filter Units.

ARI 610 - Central System Humidifiers.

ARI 630 - Selection, Installation and Servicing of Humidifiers.

SUBMITTALS

Submit under provisions of Section [01300.] [_____.]

Shop Drawings: Indicate general assembly, dimensions, weights, and materials.

Product Data: Provide catalog sheets indicating general assembly, dimensions, weights, materials, and certified performance ratings.

Manufacturer's Installation Instructions: Indicate assembly and installation instructions.

OPERATION AND MAINTENANCE DATA

Submit under provisions of Section [01700.] [01730.]

Operation Data: Include assembly instructions, float adjustment, bleed rates, and electrical requirements.

Maintenance Data: Include instructions for lubrication, filter replacement, cleaning, and spare parts lists.

EXTRA MATERIALS

Provide [one] [_____] set of filter media under provisions of Section [01700.] [_____.]

PART 2 PRODUCTS

MANUFACTURERS

[___________________________________] Model [__________.]

[___________________________________] Model [__________.]

[___________________________________] Model [__________.]

Substitutions: Under provisions of Section [01600.] [_____.]

MANUFACTURED UNITS

Units: ARI 610; factory assembled consisting of casing, tank, filters, spray pumps, water and drain connections.

Performance: [_____] cu ft/min ([_____] cu m/sec) with maximum air pressure drop [_____] inch wg ([_____] Pa), saturation efficiency minimum [_____] percent.

CASING

Assembly: Galvanized steel, minimum 16 gage (1.5 mm), reinforced and braced with galvanized steel angles, cadmium plated cap screws.

Connection: 1-1/2 inch (30 mm) flanges on inlet and outlet with 1/4 x 1 inch (6 x 25 mm) adhesive backed neoprene gasket.

Doors: [20 x 36 inch (600 x 900 mm)] [14 x 19 inch (350 x 480 mm)] [12 x 16 inch (300 x 400 mm)] [10 x 10 inch (250 x 250 mm)] quick opening access door on one side [with 1/4 inch (6 mm) thick plexiglass inspection window.

Finish: Two coats of [zinc chromate, iron oxide, phenolic resin] [_______________] paint applied after assembly.

Gasket and flange pipe penetrations, inspection panels, access doors, and other openings in casing.

DRAIN TANK

Tank: Welded [black] [stainless] steel [4 inches (100 mm)] [12 inches (300 mm) deep, [10 gage (3.3 mm)] [3/16 inch (4.8 mm)] [, finished inside and out with zinc chromate, iron oxide phenolic resin paint and coated inside with asphalt coating.

Connections: [3/4 inch (19 mm)] [1 inch (25 mm)] adjustable float valve assembly with brass rod and [brass] [polystyrene] float; [2 inch (50 mm)] [3 inch (75 mm)] [1-1/2 inch (40 mm)] drain and overflow with removeable copper suction screen.

Fabricate: Lap and weld corners watertight. Weld fittings and piping supports to tank.

FILTERS

Filters: [Two rows of neoprene coated filter mats in removable frames.] [Impregnated cellulose flute bonded with acrylic adhesive.] [ANSI/UL 900 Class II fire rating, fiberglass flute bonded with inorganic, non-crystalline filters.]

Piping: 1-1/2 inch (38 mm) PVC.

PUMPS

Spray Assembly: Moisture resistant motor with built-in overload protection, brass impeller and cut-off blade, in galvanized well.

Spray Pump:

Type: Horizontal shaft, Single stage, close coupled, radially split casing, for 125 psig (860 kPa) maximum working pressure.

Casing: Cast iron, with gage ports, drain plug, flanged suction and discharge.

Impeller: Bronze, fully enclosed, keyed to motor shaft extension.

Shaft: Stainless steel.

Seal: Carbon rotating against a stationary ceramic seat.

Performance: [_____] gpm ([_____] L/sec) flow capacity, [_____] ft ([_____] kPa) head, [_____] hp motor; Model [__________] manufactured by [____________________.]

PART 3 EXECUTION

INSTALLATION

Install in accordance with manufacturer's instructions.

Install to ARI 630.

Insulate exterior of unit same as specified for ductwork. Refer to Section 15290.

Place unit on 2 inch (50 mm) thick rigid insulation board same size as unit tank. Flash and counterflash with 20 gage (0.90 mm) galvanized steel entering and leaving sides.

Connect unit to water supply. Provide gate valve on water supply line. Provide 3/4 inch (20 mm) hose bibb accessible from interior.

Pipe drain and overflow to nearest floor drain.

Bolt spray pump directly to tank fitting. Insulate external spray piping. Refer to Section 15252.

Provide globe valve and solenoid valve in 1/2 inch (12 mm) bleed line from drain.

Provide low water cut-off in drain pan to stop spray pump.

SCHEDULE

Drawing_Code	EH-1	EH-1	EH-1

Air Flow

Overall Height

Overall Width

Face Velocity

Saturation Efficiency

END OF SECTION