Humidifier Specs.pdf
PDF 64 KB Posted
- Attached to
- The Oregon Military Museum HVAC Upgrades
- Solicitation number
- S-24800-00006663
- Issued by
- Clackamas County, Oregon
About this file
The document provided is a technical specification for a humidifier unit intended for use in a state and local contract opportunity. The humidifier is an electrically heated immersion heater type, approved by ETL/ETL-C Testing Laboratories, and designed to operate at pressures up to 19"-48 cm (W.C.) without leaking. The humidifier features a stainless steel reservoir, a surface water flusher, an automatic drain function, and a solid-state control module that regulates water level and safety functions. The humidifier is intended for use in the Oregon Military Museum HVAC Upgrades project, which seeks to replace five existing AHU and RTU units with new units featuring humidification and dehumidification capabilities.
The project is being conducted by the Oregon Military Department (OMD) in Clackamas County, Oregon. No other details regarding pricing, set asides, incumbents, funding, or contract terms are provided in the document.
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Text version
Humidifier Specification
Humidifier
The humidifier shall be an electrically heated immersion heater type.
The humidifier shall be tested and approved by ETL/ETL-C Testing Laboratories, Inc.
The humidifier shall have an evaporating reservoir with a gasket sealed cover which is capable of operating at pressures of at least 19”-48 cm (W.C.) without steam or water leaks. The reservoir shall be made of type 304L stainless steel with welded joints. Reservoir shall be mounted on slide rails for easy removal from the cabinet.
The reservoir shall be contained within a cabinet that is constructed of 18-gauge steel with a baked enamel finish.
The cabinet floor shall be designed as a drain pan with plumbing connections for drain piping.
A surface water flusher shall be included to drain away a portion of the water upon each refill cycle. This is to allow mineral deposits produced by earlier evaporation cycles to be removed.
The immersion heater(s) shall be incoloy clad and designed for 80 watts per sq. inch. They shall be attached to the reservoir cover and be easily removed for cleaning and inspection. Expansion and contraction of the heater(s) sheath allows mineral buildup to flake off.
A solenoid-operated water fill valve with internal strainer shall be factory mounted on the cover of the humidifier reservoir. A bottom fill system shall be utilized to prevent any collapse of the steam head during the fill process.
The fill valve shall be located to allow a minimum water gap of 1½” (3.81 cm).
The humidifier shall have a manual reset over-temperature switch factory installed on the humidifier reservoir. The temperature switch shall provide humidifier over-temperature protection.
A solid state, plug-in type control module shall be factory mounted within the control panel and shall electronically control the automatic refilling, low water cut-off, high water cut-off, manual surface water flushing, and safety switch interlock functions. The module shall include automatic drain functions to drain the reservoir. The drain period will be field adjustable in 10-hour increments from 10 to 150 hours with the drain duration adjustable in 2-minute increments between 2 and 30 minutes. During the drain period, the humidifier chamber will drain, and the fill valve will be energized to provide a thorough rinsing action. After the drain period is completed, the drain valve will close, and the humidifier will refill to provide humidity on demand.
The control module shall incorporate LED lights to indicate Seasonal Drain, Safety Circuit Open, Power, Fill Valve Open, Water Level Full, Cool Down Cycle, Drain Valve Open and Heater Energized. The control module shall control all water level control functions through a Tri-Probe sensor mounted on the cover of the humidifier reservoir.
The Tri-Probe sensor with stainless steel shield shall electrically sense the water level within the reservoir.
SCR Modulation, 100% solid state power controller shall be provided in the control panel. The SCR power controller will modulate the humidifier between 0-100% of its rated capacity according to humidistat demand.
The electrical compartment shall be isolated and watertight from the reservoir compartment. The electrical compartment shall be accessible by a hinged and key locked door. The panel shall include a factory wired sub-panel with a magnetic contactor, Tri-Probe water level control module, fused control circuit transformer, numbered terminal block and heater fuses. The high voltage wiring shall be shielded to prevent shock hazard. The modulating control voltage shall be field adjustable to match the controlling input signal.
The humidifier shall be supplied with a wall mount channel bracket for easy wall mounting. The bracket shall be load tested to a 600-pound capacity.
File details come from the government source that posted it. Updated .