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"U"channels to the furnace flange.See Fig- 10. Duct Furnace Blower Connections <br /> ure 11. <br /> CAUTION: Joints where supply (Applies to Model SC/HSC) <br /> air ducts attach to the furnace must Requirements <br /> be sealed securely to prevent air Proper air arrangement of blower and duct furnace with respect to angle of approach of the <br /> duct connection and the arrangement of the discharge opening of the blower are shown in <br /> leakage into drafthood or burner Figure 12.Blowers should be bottom horizontal discharge when coupled to the duct furnace. <br /> rack area.Leakage can cause poor When a top horizontal discharge blower is connected to the duct furnace,be sure that sufficient <br /> combustion, pilot problems, length of duct is provided to permit an even flow of air at the furnace. Or,insert baffles <br /> shorten heat exchanger life and between the blower and the heater to assure an even flow of air across the heat exchanger. <br /> cause poor performance. See WARNING:The furnace must be installed on the positive pressure <br /> Hazard levels, page 2. side of the air-circulating blower. <br /> • Return Air Duct/Furnace Connection - <br /> All return air ducts should be attached and CAUTION:Abrupt angle approaches such as shown in Figure 12 <br /> sealed to return air flanges to provide airtight can be detrimental to unit life.Be certain that ample air is directed <br /> connection. <br /> • Return Air Duct/Grill Size-Make certain at the base of the tube section by using turning vanes as shown. <br /> that return air ducting or grills have a free See Hazard Levels,page 2. <br /> area equal to the return duct size connection. <br /> Figure 12- <br /> Blower 15° <br /> Connections <br /> DIRECT y <br /> COUPLING L cp <br /> Straight <br /> Through SLANTED TRANSITION I --1 6" <br /> Air 24"MIN. <br /> REMOTE <br /> Suggested blower connections for <br /> straight through air flow. <br /> Use either method for good air cover- <br /> age and efficient operation. <br /> TURNING VANES <br /> With — w Y -- _ `_=_ <br /> Elbows U •.: ?. . � _ ._. <br /> or Down tx rt: ,Ii ; MIlPi I ....▪!.%•:" <br /> /11 NO AIR It NO AIR <br /> • '�' ' <br /> 1s, <br /> I' Z r>MX <br /> NOTE:DIMENSION"X" v NOTE:DIMENSION."X" , NOTE:ANGLE"Z" <br /> SHOULD NEVER BE SHOULD NEVER BE SHOULD NEVER BE <br /> LESS THAN%"Y" 6.. 0 LESS THAN 1/2"Y MORE THAN 15° <br /> 0 <br /> GOOD POOR POOR <br /> TURNING VANES 3„ <br /> "— <br /> I <br /> : _ <br /> 7.7 \i I- -HZ - 1 I- -�. -`-r; _ — -.N <br /> -* t .t, :•,�,l�, t' ' •' .,1,111 <br /> With ! 1�:►1li, - :1;;;:I, i,I. - -.moil <br /> Elbows - 16" •I X i NO AIR :•' ' I NO AIR ' <br /> Right or \I/151� `ter" <br /> Left ! <br /> NOTE:ANGLE"2" <br /> SHOULD NEVER BE <br /> MORE THAN 15° <br /> GOOD =- POOR ! `, POOR I !- <br /> Form RZ 406,Mfg#132903,Page 7 <br /> (2,1119 <br />