Horizontal Air Curtains
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1 Horizontal Air Curtains HAC Series Horizontal Air Curtains produce a high velocity curtain of ambient air to prevent the accumulation of ice and snow from entering switches. These cold air snow clearing devices consist of a compact blower unit and ducting system that delivers airflow to the switch mechanism. The blower unit is an electrically powered centrifugal fan equipped with a low velocity air intake. The blower output is ducted below the rails to nozzles mounted within the railway switch. From the two nozzles, mph high velocity air streams are directed towards the point of the switch. QHAC Series Quiet Horizontal Air Curtains are designed for use in residential areas, with reduced sound pressure levels below 60 dba at 0 feet. Figure 26 QHAC Quiet Horizontal Air Curtain Figure 27 Standard HAC Horizontal Air Curtain Model Coding HAC H 2 - DT Voltage 1-240V* 2-208V 3-460V 4-7V Frequency 1-1 Ph 3-3 Ph Power HP - up to #14 switch HP - up to #20 switch Track Options 1 - One track 2 - Multiple tracks Accessories D - Delay Start Timer T - Temperature Switch Model Series HAC Fastrax Horizontal Air Curtain QHAC Fastrax Quiet Horizontal Air Curtain *240V - only available option for 1 Phase. Profi l e H - High Profi le L - Extra Low Profi le Horizontal Air Curtains 31
2 Features Standard HAC series horizontal air curtains Quiet (low noise) QHAC series horizontal air curtains Recommended Use HP HACs on switches up to #14 Accessories Temperature Switch Automatic startup in low temperatures to maximize snow clearing Conserves energy and run time by only running when temperature is below set point HP HACs on switches up to #20 Power HP Volts Phase HAC FL Amps Note: Actual current draw varies with temperature, altitude and voltage. Controls Weather-tight all stainless steel control box with clasp for padlock Delay Start Timer Staggers starting time for minimizing inrush current for multi-unit installations Remote/Auto/Manual selector switch Motor starting contactor with overload protection Air Output HP 200 cfm, HP 3000 cfm Sound Pressure Level Standard HAC series - 6 dba at 0 feet Quiet (low noise) QHAC series - 60 dba at 0 feet Construction Galvanized steel for maximum corrosion protection Control Option Part No. Delay Start Timer Temperature Switch 1842 Match balanced impeller and motor for long vibration free life Centrifugal fan, direct drive Fan balanced to less than 0.1 ips pk to pk Air Intake Profile High profile air intake for areas with excessive snowfall Extra low profile air intake to provide minimum obstruction for areas with minimal snowfall Rotating nozzles and adjustable vane to direct air where needed Peak air speeds of over 140 MPH, highest rated switch protection available Horizontal Air Curtains Electrically isolated from crossducts Extension ducts available 32
3 Air Curtain Selection HAC Series Horizontal Air Curtains (Standard) Table 18 HAC Series Horizontal Air Curtains - High Profile Intake HAC HAC HAC HAC HAC6729 HAC HAC6629 HAC HAC6829 HAC HAC6929 HAC6930 Table 19 HAC Series Horizontal Air Curtains - Low Profile Intake HAC HAC HAC HAC HAC6726 HAC HAC6626 HAC HAC6826 HAC HAC6926 HAC6927 QHAC Series Horizontal Air Curtains (Quiet - for Residential Areas) Table 20 QHAC Series Horizontal Air Curtains - High Profile Intake HAC HAC HAC HAC HAC6736 HAC HAC6636 HAC HAC6836 HAC HAC6936 HAC6937 Horizontal Air Curtains 33
4 Table 21 QHAC Series Horizontal Air Curtains - Low Profile Intake HAC HAC HAC HAC HAC6723 HAC HAC6623 HAC HAC6823 HAC HAC6923 HAC6924 Air Curtain Ductwork Air Intake Electrical Box Integrated Acoustic Enclosure, Intake, and Motor Rain Cover Blower Blower Motor Rain Cover Transition Duct Motor Transition Duct Motor Cross Duct Cross Duct End Duct HAC Series - Crib Duct Assembly End Duct QHAC Series - Crib Duct Assembly Transition Duct Horizontal Air Curtains Ductwork End Duct Deflectors Tie Duct Ballast Retainer Flexible Duct HAC/QHAC Series - Tie Duct Assembly 34
5 Crib Duct Systems Table 22 Crib Duct Systems Nominal Clearance/Rise Crib Duct Systems Dimensions (in.) Nozzle Length A B C D E 2 in.* 40 in.** 120 in / 12 in in / 6 in in / 0 in *Systems with 2 in. nozzles are intended for installation in the second crib, or 40 in. nozzles in the third crib ahead of the switch points. **40 in. nozzles are recommended for use with quiet systems for maximum noise reduction. Horizontal Air Curtains Ductwork 3
6 Tie Duct Systems Table 23 Tie Duct Systems Nominal Clearance/Rise Tie Duct Systems Dimensions (in.) Rail Base Width A B C D E 6 in.. in. 126 / / / Horizontal Air Curtains Ductwork 36
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