Standard Water “GX” Series Gas Fired Humidifier
Sheet No.GX-1Standard Water“GX” SeriesGas Fired HumidifierLooking for an alternative to electrically generatedsteam humidification?Concerned about usingchemically treated boiler steam for directhumidification? If so, PURE’s “GX” Series (patentno. 6,705,535) Gas Fired Humidifiers are exactlywhat you’re looking for.PURE’s commitment to quality and ease ofmaintenance is further illustrated by the use ofpressure clamps that secure the heat exchanger tothe reservoir and eliminate the need for through-thewall threaded fasteners. The humidifiers utilize a Tri-Probe sensor and a flusher, which removes watermineral buildup during each fill cycle, and doublesas a water overflow safety pipe to drain. Anaccumulative timed drain cycle performs automaticdraining and flushing, further reducing mineralbuildup within the reservoir. Precise modulation ofthe humidifier output is maintained by a high qualitygas burner which modulates the gas flow into theheat exchanger.Indoor air quality issues concerning the use of boilersteam for direct humidification have resulted in agrowing apprehension for the use of “steaminjection” type humidifiers. The possible carryoverof chemical additives and odor created within someboiler systems are being addressed in an effort toimprove the indoor air quality for new and existingbuildings. The alternative, electric humidifiers, canbe prohibitive due to the higher energy costsassociated with electrically generated steam, versusthe typically lower energy cost of natural gas. Forthese reasons, PURE has developed the “GX”Series Gas Fired Humidifier.Each humidifier is supplied with an INTAC controlsystem mounted in a NEMA-12 enclosure. TheINTAC microprocessor control system providesconstant monitoring of the water level and safetysystems, as well as providing a gas valve interlock.This will prevent operation, should any of the safetycircuits open.The “GX” Series Humidifiers utilize a stainless steelheat exchanger, which allows for a gas powerburner to be used as the energy source forproducing steam from tap water.The “GX” humidifiers come standard with freestanding support legs, factory mounted controlpanel, factory insulation and DCT-927 draintempering kit. Flexible hose is available for remotemounting of the humidifier from the injection tube.Multiple injection tubes are available for improveddissipation of the steam in large ducts ormanufactured air handling systems.Multiplehumidifiers can be manifolded together to a singleinjection tube system to provide increased capacityon large air volume projects.The steam produced by the “GX” Series Humidifieris free from chemical or mineral carryover, providingpure humidification for today’s stringent indoor airquality requirements. PURE’s highly efficient heatexchanger produces combustion efficiencies up to84%, as well as providing simplified maintenance.The unique side entry heat exchanger can beremoved without removing the cover and injectiontube system, and provides a large clean-out openingwhich extends the full length of the humidifier.Furthermore, the unique design allows for easyremoval of the gas burners.The versatility of the “GX” Series will allow you todesign them into any system simply, efficiently andreliably.Our results are comfortingPURE HUMIDIFIER and INTAC are registered trademarks of PURE Humidifier Co.10-19
Sheet No.Capacities, Electrical & WeightsGX-2This humidifier is a forced combustion type that can be used with natural gas or liquid propane. The burner canbe easily removed to access the side entry exchanger for cleaning. It is designed to work with low-pressure gasbetween 5” W.C. up to 14” W.C.Unit Capacities in Pounds per Hour (kg/hr)†Weights in lbs. (kg) and Electrical SpecificationStandard WaterUnit Model No.SteamCapacityLb/Hr (kg/Hr)No. ofBurners*BTUInputExhaustManifoldVent Size (cm)ShippingWeight (kg)OperatingWeight (kg)120 Volt, 60 HzFull LoadAmpsGX-3110 (49.9)1150,0004” (10.2)201 lbs. (91.2)420 lbs. (190.5)5.0GX-4300 (136.1)1400,0004” (10.2)390 lbs. (176.9)710 lbs. (322.1)5.0GX-8600 (272.2)2800,0006” (15.2)827 lbs. (375.1)1391 lbs. (630.9)10.0GX-12900 (408.2)31,200,0008” (20.3)1125 lbs.(510.3)2072 lbs. (939.9)15.0† Actual humidifier capacity may vary due to the heat loss from the humidifier reservoir. The ambient airtemperature, air velocity and injection tube system will affect the rate of heat loss from the reservoir.* Altitude adjustment:100% up to 2000’Over 2000’, 4% de-rate per 1000’Gas Piping Pressure Drop DataEQUIVALENT LENGTH OF STRAIGHT PIPE IN 260540950CFH GAS WITH .2" PRESSURE DROPPipe Size in Inches3/4"1"1 1/4"1 1/2"2"2 00731502604108501550661352303707501375EQUIVALENT LENGTHS OF STANDARD PIPE IN FEET FOR LISTED FITTINGSFitting Type3/411 1/41 1/222 1/2NominalStd. Tee2.45.57.591213.5Pipe SizeStd. Elbow4.42.73.74.55.56.1in InchesGas Input CFHfor GX-Series HumidifiersModelMax BTU/HrInputMax CFH (Nat.Gas)Max 00,000800320GX-121,200,0001200480
Sheet No.FeaturesGX-31131210459678Features1. Tri-Probe Sensor7. INTAC Microprocessor2. 1/4”-NPT Water Inlet & Strainer8. Support Legs3. Over Temperature Cut-Out Switch9. Burner Assembly4. Flusher & Overflow Piping10. Exhaust Connection5. 3/4” Motorized Drain Valve11. Steam Outlet Connection6. Control Panel
Dimensions & LayoutSheet No.GX-4GX-3 & GX-48.0”(20.3)Required Clearance:For recommended service and maintenance purposesthe following clearances should be maintained:Right side, see Top View for required clearance“A”“B”Front side, NEC requires 36” clearance tocontrol cabinetLeft side, 6” for access“H”Top, 12” for cover and Tri-Probe removal2.8”(7.1)7.8”(19.8)“E”Rear, 6” for accessSteam Outlet Connection(Size and Qty. will vary withapplication)Clearance required forexchanger removalTop View“C”INTACRHumidifier Control SystemPURE Humidifier Company“F”Gas Inlet“D”Front ViewRight Side ViewUnit Dimensions in Inches (cm)Standard WaterUnit Model No.Dim. “A”Dim. “B”Dim. “C”Dim. “D”Dim. “E”Dim. “F”Dim. “G”Dim. “H”GX-334.18” (86.8) 20.46” (52.0) 13.84” (35.2)24.0” (60.9)45.9” (116.5)3/4”-NPT3.0” (7.62)50.0” (127.0)GX-454.0” (137.2)24.0” (60.9)54.7” (138.9)3/4”-NPT3.0” (7.62)66” (167.6)30.1” (76.5)13.84” (35.2)Heat exchangers have a top and bottom. There is a break (crease) on the bottom side of the heat exchanger.Do not install heat exchanger upside-down.All dimensions are approximate and subject to change at manufacturer’s discretion.
Dimensions & LayoutSheet No.GX-8GX-59.0”(22.9)Required Clearance:For recommended service and maintenance purposesthe following clearances should be maintained:“A”Right side, see Top View for required clearanceFront side, NEC requires 36” clearance tocontrol cabinet“B”Left side, 6” for accessRear, 6” for access“E”7.8”(19.8)Top, 12” for cover and Tri-Probe removal“H”5.6”(14.2)Steam Outlet Connection(Size and Qty. will vary withapplication)INTACClearance required forexchanger removalTop View“G”ExhaustConnectionRHumidifier Control SystemPURE Humidifier Company“C”“F”Gas Inlet“D”Front ViewRight Side ViewUnit Dimensions in Inches (cm)Standard WaterUnit Model No.Dim. “A”Dim. “B”Dim. “C”Dim. “D”Dim. “E”Dim. “F”Dim. “G”Dim. “H”GX-854.0” (137.2)30.1” (76.5)32.5” (82.6)24.0” (60.9)54.7” (138.9)1”-NPT3.0” (7.6)66.0” (167.6)Heat exchangers have a top and bottom. There is a break (crease) on the bottom side of the heat exchanger. Do not install heatexchanger upside-down.All dimensions are approximate and subject to change at manufacturer’s discretion.
Dimensions & LayoutSheet No.GX-6GX-129.0”(22.9)Required Clearance:For recommended service and maintenance purposesthe following clearances should be maintained:“A”Right side, see Top View for required clearanceFront side, NEC requires 36” clearance tocontrol cabinet“B”Left side, 6” for accessRear, 6” for access“E”7.8”(19.8)Top, 12” for cover and Tri-Probe removal“H”5.6”(14.2)Steam Outlet Connection(Size and Qty. will vary withapplication)Clearance required forexchanger removalTop View“G”ExhaustConnection“C”“F”Gas Inlet“D”Front ViewRight Side ViewUnit Dimensions in Inches (cm)Standard WaterUnit Model No.Dim. “A”GX-1254.0” (137.2)Dim. “B”Dim. “C”30.1” (76.5) 43.5” (110.5)Dim. “D”Dim. “E”Dim. “F”24.0” (60.9)55.8” (141.1)1-1/4”-NPTDim. “G”Dim. “H”3.0” (7.6) 66.0” (167.6)Heat exchangers have a top and bottom. There is a break (crease) on the bottom side of the heat exchanger. Do not install heatexchanger upside-down.All dimensions are approximate and subject to change at manufacturer’s discretion.
Specification SampleSheet No."GX" SeriesGX-7HumidifierThe humidifier (patent no. 6,705,535) shall be forced draftcombustion gas burner type humidifier as manufacturedby PURE Humidifier Co. of Chaska, Minnesota.The humidifier shall be tested and approved by ETL/ETLC Testing Laboratories, Inc to AGA/CGA standards.The humidifier shall have an evaporating reservoir with agasket sealed cover which is capable of operating atpressures of at least 19”-48 cm (W.C.) without steam orwater leaks. The reservoir shall be made of type 304Lstainless steel with welded joints.The humidifier shall be designed to facilitate easyremoval of the gas heat exchanger for periodic scaleremoval and inspection.The cover and gas heatexchanger shall be secured to the unit by the use of quickrelease clamps. The gas heat exchanger shall beremovable from the side of the humidifier withoutdisturbing the cover or injection tube system’s steamsupply piping.The gas heat exchanger shall be constructed of type304L stainless steel with round heat transfer tubes.Tubes shall be self cleaning via expansion andcontraction of tubes. Coating of tubes is not required.The humidifier shall require only 2 sides for serviceaccess.The forced draft combustion burner shall be capable ofexpelling flue gases up to 100 ft (31 m) without the use ofa power vent (sidewall or roof vented).Unit shall be covered (except front face) with 3/4” (1.90cm) thick fiberglass duct insulation. Insulation materialshall have aluminum facing.Provide support legs made of 1 ¼” x 1 ¼” x ¼” (3.2 x 3.2x .6 cm) angle iron and painted with gray enamel paint.Distance from humidifier bottom to floor shall be 24” (61cm).Humidifier control cabinet shall be factory mounted andwired to the face of the humidifier reservoir.Humidifier is provided with a DCT-927 self actuated draintempering kit. The drain tempering kit is designed toprovide drain and condensate water at a temperature ofless than 140 ºF. The drain tempering kit is shippedlooseAn adjustable surface water flusher shall be included todrain away a portion of the water upon each refill cycle.This will allow mineral deposits produced by earlierevaporation cycles to be removed.A solenoid-operated water fill valve with internal strainershall be factory mounted on the top near the front of thehumidifier reservoir. A bottom fill system shall be utilizedto prevent any collapse of the steam head during the fillprocess. The fill valve shall be located to allow a minimumwater gap of 1 ½” (3.81 cm).The humidifier shall have a manual reset overtemperature switch factory installed on the humidifierreservoir. The temperature switch shall provide humidifierover-temperature protection.A motor-operated drain valve with a brass body, and acumulative timer will be incorporated into the INTAC microprocessor controller. When the timer is activatedthe burners(s) will be de-energized and the drain valvewill open. The drain period will be field adjustable in 1hour increments between 1 and 500 hours with the drainduration adjustable in 1-minute increments between 1 and120 minutes. During the drain period, the humidifyingchamber will drain completely, and the fill valve will beenergized to provide thorough rinsing action. After thedrain period is completed, the drain valve will close, andthe humidifier will refill and provide humidity on demand.A seasonal drain system shall automatically drain thehumidifier after a selected "NON-USE" period. Thecontroller shall automatically reset the humidifier on a callfor humidity.The humidifier shall be provided with an ETL listed JICNEMA 12 control cabinet, shipped factory mounted andwired to the reservoir. The control cabinet shall be madeof 14-gauge steel with ANSI 61 gray polyester powdercoating, continuous hinge and oil-resistant gasket. Thepanel shall include a factory wired subpanel with gasvalve interlock, Tri-Probe water level control, fused controlcircuit transformer, numbered terminal block and mainpower fuse(s).The control system shall maintain humidification duringthe fill cycle to maintain a consistent relative humidity.An INTAC programmable electronic microprocessorhumidifier control system shall be mounted and pre-wiredto the humidifier control panel door.The INTAC controller shall provide digital display of all humidifierfunctions.Reference the "Options" page for a description of the options which can be added to the base specification.
INTAC Specification Sample"GX" SeriesAn INTAC programmable electronic microprocessorhumidifier control system shall be mounted and pre-wired tothe humidifier control panel door. All humidifier electrical,ground and control terminal connections shall be enclosed inan ETL listed NEMA 12 enclosure. The INTAC controllershall provide the following standard features: Self-diagnostics and system verification on start-up.Evaporating reservoir water level verification, control andsafety interlock. The controller shall be compatible with allwater types.Automatic reservoir drain and flush system.Thecontroller shall periodically drain and flush the reservoirbased on Accumulated Run Time, Elapsed Time or by anexternally triggered dry contact closure (except RO/DIwater).Cold water tempering prevents excessively hot waterfrom draining during an automatic or seasonal draincycle.Seasonal Drain system shall automatically drain thehumidifier reservoir after a selected “NON-USE” period.The controller shall automatically reset the humidifier on acall for humidity (if utilized).Safety circuit input terminals including over-temperatureshut down.Terminal connections to accept virtually all control inputsignals. Input control range is selected as an “ONSCREEN” prompt.User adjustable controlling and high-limit RH PIDfunctions with adjustable parameters (if utilized).Door-mounted display and user interface. Provides twolines of system messaging on a display screen, LEDoperational indication and keypad parameter entrysystem.Display brightness is adjustable.Adjustable input signal filter to attenuate noisy controlinput signal.Numbered screen prompts for setup and serviceidentification.Keypad lockout with user selected access levels.Time-delayed scrolling display loop will begin cycling tenminutes after no buttons have been pressed and willdisplay the next item for 30 seconds before continuingdown the list – displays system parameters including:Low and High RH Alarms, System Faults, System Status,Set Point and Actual Space RH, Set Point and ActualDuct RH (optional), Outdoor Air Temperature (optional),Percent Power Output, Humidifier Output (in lbs/hr or kg/hr), Accumulated Run Time, Time to Clean timer, WaterLevel, Water Temperature Set Point and Actual (optional)and Control Type. Sheet No.GX-8INTAC controller will automatically shut down whenthe ambient temperature is outside of designedoperating temperature range.Full Networking and BAS communication capability.Communication connections shall provide two-waycommunication via EIA-485 connected Modbusbetween the INTAC controller and the BuildingAutomation System (BAS) (if utilized).High/Low humidity deviation alarm contacts(modulating control only).Multiple humidifiers can run off of one control signalfrom a BAS system. Humidifiers can be set up to runin parallel or in series.Alarm contacts for Safety Circuit/System Fault/LowWater.Flash Memory – allows system upgrades through EIA-485 terminal connections.OPTIONAL FEATURESA. Variable air volume (VAV) anticipation control. TheINTAC software shall accept a modulating high-limithumidity input and space controlling RH input, thenmodulates the heater output to prevent oversaturation of the supply air due to changes in thequantity of air flow. A compatible humidity sensorshall be shipped loose for field installation.B. Cold weather relative humidity reset. The INTAC software shall accept a modulating temperature inputand automatically reduce the space RH set-point on adrop in the outside temperature. The reduction of theRH set-point during cold weather periods preventsdamage due to interior window condensation.C. Reservoir thermocouple water temperature control.The INTAC software provides standby watertemperature sensing and freeze protection.Reference the "Specification Sample" for the humidifier base specification.
OptionsSheet No."GX" SeriesGX-9To HumidifierControl CabinetFreeze Protection. A factory installed temperature sensorshall be mounted onto the humidifier reservoir. The systemshall maintain the water temperature above freezing.Control Panel Door Lock. Control cabinet shall beprovided with a factory installed key lock on the cabinetdoor.Standby Water Temperature Sensing. Consists of atemperature sensor to maintain water temperature at aselected level for fast response upon a call for humidity.Controls and Safety DevicesModulating Fill. For applications that require RH stayingabove a minimum threshold, a smaller fluctuation allows youto set the setpoint lower. Not only does this create a costsavings, but also saves on energy and water usage, makingit a more economical option than the constant overfillmethod. Field-retrofittable on units that use our Tri-Probewater sensor.Injection TubesInjection tube(s) and Flexible Hose. Each unit shallinclude one or more 10 ft. (305 cm) sections of 1 ½” (3.8cm) I.D. flexible hose and a 1 ½” (3.8 cm) O.D. stainlesssteel injection tube long enough to extend across the duct.Steam ports shall direct steam upward into the airflow. Thereservoir cover shall have a matching connection so theflexible hose can be connected with two stainless steel hoseclamps. A two-piece duct plate shall be provided to seal theduct opening.Fast-Pac Multiple Tube Assembly.Tube assemblyconsists of a stainless steel supply/condensate header witha 3/4"-NPT drain connection and horizontal 11 2"Østainless steel injection tubes.Insty-Pac Multiple Tube Assembly. Tube assemblyconsists of a steam supply/separator header constructed ofstainless steel with steam inlet, condensate drain outlet andsteam jacketed injection tubes welded to header. Steamjacketed injection tubes constructed of stainless steel withpunched steam ports of the proper size and spacing todeliver the maximum specified capacity.High Efficiency Insulated Tubes. Thermoplastic wrapreduces condensate loss and unwanted heat gain duringcooling mode.VAV Control. The INTAC software shall accept amodulating high-limit humidity input and space controllingRH input and modulate the heater output to prevent oversaturation of the supply air due to changes in the quantityof airflow. A compatible space and duct humidity sensorshall be shipped loose for field installation.CommunicationsGateway.Allows Modbus tocommunicate with BACnet or LonWorks networks.Gateway can be used concurrently as a cloud connecteddevice for secure remote access for diagnostics,monitoring, alarming and configuration of humidfier in thefield. Wi-Fi connectivity can be enabled if desired.Airflow Proving Switch. A diaphragm operated airflowproving switch with adjustable range of .05” W.C. to 2.0”W.C. shall be provided for field installation.Duct High-Limit.A high-limit humidistat shall beprovided for duct installation. The high-limit shall be fieldset to prevent over saturation within the supply duct.Miscellaneous AccessoriesCondensate Pump. Used to lift condensate from thehumidifier or tube assembly.Outdoor Enclosure. Galvanized steel enclosure withdual tank freeze protection, control panel mounted,ventilation and hinged access doors. Enclosure is readyto be curb-mounted with the humidifier pre-installed.Ships as one piece. Roof curb is not included.VentingSealed Combustion Air Kit. Consists of a 5" roundstainless steel adaptor that allows outside air to be pipeddirectly to the intake of the burner for combustion.Reference the "Specification Sample" for the humidifier base specification.
Series Gas Fired Humidifier. The “GX” Series Humidifiers utilize a stainless steel heat exchanger, which allows for a gas power burner to be used as the energy source for producing steam from tap water. The steam produced by the “GX” Series Humidif
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