Standard Rack Assembly

– Fully sheeted duct furnaces mounted in a 16-gauge galvanized steel frame.
– Provides listed temperature rise and air side pressure drop performance.
– Each furnace includes an individual shutoff valve, flexible gas connector & union piped to properly sized supply header.
– Condensate drains pre-piped to a common header.
– Easy removal of any single duct furnace.
– All controls prewired to a sequencer for system control.
– Customer only needs to provide Power, “Call for Heat” and a 0-10 VDC signal.

Outdoor Venting Kit

– Vent riser assembly with integral rain cap.
– Provides proper venting of flue gases and prevents flue gas recirculation into burner combustion air supply.

Application Guidelines Product Specification User Guidelines OEM Instructions Submittal / Order Information

Note: You must be logged in to view CAD, Gas Train and Wiring Diagram files.
Model NumberPDF  Alt PDF  PDF of Gas TrainPDF of Wiring DiagramMax Input MBHMax Output MBHMin Input MBHMin Output MBHNat. Gas Turndown RatioMax Ind. HX Input# of HX'sMax CFMMax APD @ Min RiseMax Temp RiseMin CFMMin APD @ Max RiseDim ADim BDim CDim DWeight (Lbs.)
HDB-VHX-225-450-OPDFPDFPDFPDF450360453610 to 12252166670.329037040.0248.861978.8117512
HDB-VHX-250-500-OPDFPDFPDFPDF500400504010 to 12502185190.399041150.0248.861978.8117512
HDB-VHX-270-540-OPDFPDFPDFPDF540432544310 to 12702200000.369044440.0255.361978.8117552
HDB-VHX-300-600-OPDFPDFPDFPDF600480604810 to 13002222220.449049380.0355.361978.8117552
HDB-VHX-315-630-OPDFPDFPDFPDF630504635010 to 13152233330.49051850.0261.871978.8117594
HDB-VHX-225-675-OPDFPDFPDFPDF675540453615 to 12253250000.329055560.0265.121978.8117718
HDB-VHX-350-700-OPDFPDFPDFPDF700560705610 to 13502259260.489057610.0361.871978.8117594
HDB-VHX-375-750-OPDFPDFPDFPDF750600756010 to 13752277780.469061730.0368.371978.8117642
HDB-VHX-400-800-OPDFPDFPDFPDF800640806410 to 14002296300.529065840.0368.371978.8117642
HDB-VHX-300-900-OPDFPDFPDFPDF900720604815 to 13003333330.449074070.0382.241978.8117773
HDB-VHX-315-945-OPDFPDFPDFPDF945756635015 to 13153350000.49077780.0291.991978.8117836
HDB-VHX-500-1000-OPDFPDFPDFPDF10008001008010 to 15002370370.577598770.0581.3723.6378.8120733
HDB-VHX-250-1000-OPDFPDFPDFPDF1000800504020 to 12504370370.399082300.0288.741978.8117919
HDB-VHX-350-1050-OPDFPDFPDFPDF1050840705615 to 13503388890.489086420.0391.991978.8117836
HDB-VHX-600-1200-OPDFPDFPDFPDF120010001209610 to 16002444440.6175118520.0594.3723.6378.8120773
HDB-VHX-400-1200-OPDFPDFPDFPDF1200960806415 to 14003444440.529098770.03101.741978.8117903
HDB-VHX-500-1500-OPDFPDFPDFPDF150012001008015 to 15003555560.5775148150.05121.2423.6378.81201076
HDB-VHX-600-1800-OPDFPDFPDFPDF180014401209615 to 16003666670.6175177780.05140.7423.6378.81201136
Note: For Propane gas, turndown is 60% of stated natural gas turndown.
Model NumberPDF  Alt PDF  PDF of Gas TrainPDF of Wiring DiagramMax Input MBHMax Output MBHMin Input MBHMin Output MBHNat. Gas Turndown RatioMax Ind. HX Input# of HX'sMax CFMMax APD @ Min RiseMax Temp RiseMin CFMMin APD @ Max RiseDim ADim BDim CDim DWeight (Lbs.)Total Amps 120VTotal Amps 208V 230V
HDB-VHX-225-450-O-X2PDFPDFPDF900720907220 to 12254166670.6418037040.0448.8690.7178.811713861610
HDB-VHX-250-500-O-X2PDFPDFPDF10008001008020 to 12504185190.7818041150.0448.8690.7178.811713921610
HDB-VHX-270-540-O-X2PDFPDFPDF10808641088620 to 12704200000.7218044440.0455.3690.7178.811714801610
HDB-VHX-300-600-O-X2PDFPDFPDF12009601209620 to 13004222220.8818049380.0655.3690.7178.811714881610
HDB-VHX-315-630-O-X2PDFPDFPDF1260100812610020 to 13154233330.818051850.0461.8790.7178.811715801610
HDB-VHX-225-675-O-X2PDF13501080907230 to 12256250000.6418055560.0465.1290.7178.811717502415
HDB-VHX-350-700-O-X2PDFPDFPDF1400112014011220 to 13504259260.9618057610.0661.8790.7178.811715881610
HDB-VHX-375-750-O-X2PDFPDFPDF1500120015012020 to 13754277780.9218061730.0668.3790.7178.811716981610
HDB-VHX-400-800-O-X2PDFPDFPDF1600128016012820 to 14004296301.0418065840.0668.3790.7178.811716981610
HDB-VHX-300-900-O-X2PDF180014401209630 to 13006333330.8818074070.0682.2490.7178.811718922415
HDB-VHX-315-945-O-X2PDF1890151212610030 to 13156350000.818077780.0491.9990.7178.811720422415
HDB-VHX-500-1000-O-X2PDFPDFPDF2000160020016020 to 15004370371.1415098770.181.3798.8678.812022082010
HDB-VHX-250-1000-O-X2PDF200016001008040 to 12508370370.7818082300.0488.7490.7178.811721143220
HDB-VHX-350-1050-O-X2PDF2100168014011230 to 13506388890.9618086420.0691.9990.7178.811718522415
HDB-VHX-600-1200-O-X2PDFPDFPDF2400200024019220 to 16004444441.22150118520.194.3798.8678.812019322010
HDB-VHX-400-1200-O-X2PDF2400192016012830 to 14006444441.0418098770.06101.7490.7178.811720422415
HDB-VHX-500-1500-O-X2PDF3000240020016030 to 15006555561.14150148150.1121.2498.8678.812026483015
HDB-VHX-600-1800-O-X2PDF3600288024019230 to 16006666671.22150177780.1140.7498.8678.812030083015
Note: For Propane gas, turndown is 60% of stated natural gas turndown.