Dehumidification >> How Long Should A Dehumidifier Run Per Day

Unit(s) shall be capable and designed for year-round, 24-hours-a-day operation; and requiring only connections of ducts, utilities, and remote sensors, controllers, How Long Should A Dehumidifier Run Per Day and monitors. 3. Unit(s) shall include active regeneration system for control of dehumidification processes. 

Casing: 1. Double-wall construction with corrosion-protective removable panelshinged access doors with neoprene gaskets, minimum 50-mm (2-inch) thick thermal insulation fill, stainless steel fasteners, knockouts for electrical How Long Should A Dehumidifier Run Per Day and piping connections through the side of the unit bottom of the unit without the roof curb, condensate drain connection, and lifting lugs. 

2. The unit housing the internal partitions shall be constructed of minimum 18 gage galvanized steel or aluminum pre-insulated double wall panels with a minimum of 50-mm (2-inch) thermal insulation. The base shall be all welded, structural steel or formed 14-gage, How Long Should A Dehumidifier Run Per Day galvanized steel. Units shall have cross supports for each major component and base channels and lifting eyes to facilitate rigging. 

The units shall be of water and air tight construction over all with interior air tight construction between various sections of the units. Adjoining panels shall be sealed with a silicon compound How Long Should A Dehumidifier Run Per Day or heavy duty compression type gaskets. Leakage rate shall not exceed 2 percent at a pressure of 746 Pa (3.0 inches water gage). 

3. All non-pre-insulated exterior panels shall be insulated with minimum 25-mm (1-inch) vinyl- or foil-faced fiberglass insulation without exposed edges, How Long Should A Dehumidifier Run Per Day and secured by permanent mechanical fasteners. 4. All exterior panels shall be embossed aluminum cabinet panels constructed with corrosion-protective coating on the manufacturer's standard coating. 

5. All internal air-processing and air-treatment components shall be removable through removable access panels without dismantling plenums or ductwork. Access panels shall be provided with resilient gaskets and quick-release hardware. 7. Access doors for filters and control adjustment shall have corrosion-resistant, How Long Should A Dehumidifier Run Per Day continuous hinge or heavy-duty, multiple hinges. 

8. Surfaces in contact with the airstream shall comply with requirements in ASHRAE 62.1-2007. C. Dehumidifier: 1. The dehumidifier shall include a desiccant wheel utilizing a fractional horsepower electric motor and a variable speed drive How Long Should A Dehumidifier Run Per Day and reactivation air flow indicating devices steam hot water electric direct gas fired indirect gas fired reactivation heater reactivation fan/motor assembly, reactivation energy modulation system. 

Electric/mechanical rotation fault circuitry and necessary manual and automatic dampers for proper functioning of the unit under all operating conditions. 2. Dehumidifier shall rotary type, designed for continuous operation, How Long Should A Dehumidifier Run Per Day and arranged to provide a counter flow of process and reactivation air streams with full-face pressure seals or low-friction contact seals on both sides to prevent cross leakage for external static pressure of up to 622 Pa (2.5 inches w.g.) 

3. Desiccant rotor shall have synthesized silica gel, enhanced with titanium, bonded to a ceramic matrix, with filled voids and encapsulating the ceramic. Driver shall be a motor with adjustable drive sheaves and belt-tensioning idler pulley How Long Should A Dehumidifier Run Per Day or adjustable motor mount. 4. The rotary desiccant shall transfer water in the vapor phase. 

The design and geometry shall provide for laminar flow over the operating range for minimum pressure loss with maximum transfer surface How Long Should A Dehumidifier Run Per Day and minimum power requirements. The desiccant shall be a permanent integral part of the structure. 

Heat Exchanger: 1. The heat exchanger shall be constructed of non-hygroscopic material with corrosion protection, described above for the coils and surfaces thermal wheel to prevent the transfer of water vapor or an air-to-air heat pipe with copper tubes and aluminum fins, How Long Should A Dehumidifier Run Per Day fabricated with capillary wick structure charged with ozone friendly refrigerant to be used in the process and reactivation air steams. 

Refrigerant shall comply with ASHRAE 15, Group 1. For thermal wheel, supply How Long Should A Dehumidifier Run Per Day and cooling air streams shall be counter flow and the component provided with full face contact seals on both sides to prevent leakage. The heat transfer effectiveness of the heat exchanger shall be minimum 80 percent with a maximum air pressure loss of 125 Pa (0.50 inch w.g.) 

2. Electric motor shall be fractional-horsepower with close-coupled speed reducer and a belt drive with belt tensioning system for the thermal wheel. E. Controls and Wiring: Factory-installed microprocessor type to control and monitor unit and communicate to central-control processor, How Long Should A Dehumidifier Run Per Day and shall operate dehumidification units and maintain humidity and temperature set points. 

The controller shall be connected to the building DDC control system via an open protocol BAC net interface. 1. The unit shall have a factory wired and unit mounted central, How Long Should A Dehumidifier Run Per Day electrical control panel with a single power supply connection. All internal wiring shall be in accordance with the National Electrical Code. 

Unit shall have a non-fused main power disconnect and control components required for automatic operation based on signals from space mounted duct mounted humidity How Long Should A Dehumidifier Run Per Day and temperature controls. Control panel shall have terminals for remote control devices. 2. Controls shall be capable of shutting down the dehumidifier when humidity loads are reduced and the process shall be reversed when there is an increase in humidity loads. 

3. Reactivation energy shall be automatically reduced at lower than design humidity loads. 4. Carbon dioxide sensor mounted in return air shall operate minimum outdoor-air damper position. Discharge-air, outdoor-air, conditioned-space, How Long Should A Dehumidifier Run Per Day control set-point-temperature, and outdoor-air enthalpy shall be displayed with a LCD in control panel. 

6. Filter pressure drop and alarm shall be displayed by an LCD in control panel. 7. Airflow, fans, system, unit operation, and operating mode status shall be displayed in control panel. SPEC WRITER NOTE Select a housed centrifugal fan How Long Should A Dehumidifier Run Per Day or a plenum fan to suit specific application. F. Fan Section: Housed Centrifugal Fans 

1. Supply and exhaust fans, shall be centrifugal, galvanized steel with baked enamel power coated finish, and shall be belt driven with adjustable sheaves and self-aligning, How Long Should A Dehumidifier Run Per Day grease-lubricated ball bearings with extended grease fittings easily accessible inside the / casing for process and reactivation air as scheduled. 

2. Fans shall be AMCA class II construction, double-width, and double-inlet centrifugal air foil forward cured How Long Should A Dehumidifier Run Per Day or / backward inclined or plug type, factory dynamically balanced and rated in accordance with AMCA standard 210. 3. Fan sized for greater than 3000 CFM shall be belt / driven. Belts shall be sized for 150 percent of fan motor HP. 

4. Fans shall be vibration isolated internally or externally. 5. Connections at fan How Long Should A Dehumidifier Run Per Day discharge shall have flexible duct / connectors. 6. Fan motor and Drive: Motors shall be nominal 1750 RPM. Motor for reactivation fan may be direct-drive 3500 RPM. 

Motors shall / be NEMA MG 1 Design B with open drip-proof housing How Long Should A Dehumidifier Run Per Day and a minimum service factor of 1.15 complying with requirements in specification Section 230511, COMMON WORK RESULTS FOR HVAC. 7. Plenum Fans Single and/ or Multiple Fans in an Array.

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