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Figures Figure 1 - RL Series Unit Orientation ........................................................................................... 25
Figure 2 - Curb Mounting ............................................................................................................. 26
Figure 3 - Curb Detail ................................................................................................................... 26
Figure 4 - Curb Mounting with Dimensions ................................................................................. 27
Figure 5 - Steel Mounting Rail with Dimensions ......................................................................... 27
Figure 6 - Marked Lifting Points .................................................................................................. 27
Figure 7 - Unit Base and Sides ..................................................................................................... 29
Figure 8 - Unit Roof Flange Splice Detail .................................................................................... 29
Figure 9 - Air Hood Shown in the Open Position ......................................................................... 30
Figure 10 - Factory Supplied End Flashings................................................................................. 31
Figure 11 - Vestibule Exhaust Fan................................................................................................ 31
Figure 12 - Terminal Block ........................................................................................................... 32
Figure 13 - Gas Heater Rain Hood ............................................................................................... 35
Figure 14 - Gas Heater Rain Hood Screws ................................................................................... 36
Figure 15 - Draw-Through Drain Trap ......................................................................................... 37
Figure 16 - Blow-Through Drain Trap ......................................................................................... 37
Figure 17 - Evaporative-Cooled Cond. Section, Including Field Water Connections and Base Cutout ............................................................................................................................................ 39
Figure 18 - Air Volume Band ....................................................................................................... 40
Figure 19 - Air Volume Band Tab Locations ............................................................................... 40
Figure 20 - Securing Air Volume Band Ends ............................................................................... 41
Figure 21 - Plenum Fan Gap Tolerances ...................................................................................... 41
Figure 22 - Fan with the HUB on the top and RET on the bottom. .............................................. 42
Figure 23 - Fan Bushing Mount Location..................................................................................... 42
Figure 24 - RET shown with pin in groove 4 ............................................................................... 42
Figure 25 - HUB and RET ............................................................................................................ 42
Figure 26 - Blower Assembly ....................................................................................................... 44
Figure 27 - Rear Isolator Detail .................................................................................................... 44
Figure 28 - Fan Assembly Detail .................................................................................................. 44
Figure 29 - Closed Back Draft Damper ........................................................................................ 45
Figure 30 - Open Back Draft Damper........................................................................................... 45
Figure 31 - Top Clip and Side Spring Fastener Securing Filters in Place .................................... 45
Figure 32 - Replaceable Core Filter/Drier .................................................................................... 47
Figure 33 - Lockable Door Handles.............................................................................................. 50
Figure 34 - Typical Factory Mutual (FM) Gas Piping Schematic for a Direct Fired Heater ....... 53
Figure 35 - Removing Piping Scale with Pin Vise ....................................................................... 55
Figure 36 - Proper Unit Location .................................................................................................. 57
Figure 37 - Improper Unit Locations ............................................................................................ 57
Figure 38 - Water Makeup Valve ................................................................................................. 60
