1125 80TH ST SW 2018-04-05 - Laserfiche WebLink

8. Optional Condensation Drain Figure 10-Connecting Supply Air Duct to the Furnace for Duct Furnaces (Applies to (1)Flanges on the furnace(heat exchanger)turn out as shown. (2) Model SC/HSC or SCE) Shape duct connection as shown--"U"on top and bottom;"L"on sides. (3)Slide"U"channels over furnace top and bottom flanges Model SC,HSC and SCE furnaces are certified for installation up- making connection. (4)Form"U" channels to seal sides. Drill stream or downstream from a cooling coil.When installed downstream and lock with sheetmetal screws. from a refrigeration system,condensation will form;and therefore,ad- equate provision must be made to dispose of condensate. Periodic cleaning of the condensate collection and disposal system is44fr required. 1-- 11* Install drain connection,Option CS1,on the furnace casing as illus- Heater Duct liasibL 1trated in Figure 8.NOTE:Requires a four-inch minimum clearance under the furnace if a 1 ; 1 90°street elbow is used. 10"(254mm) Figure 8-Option CS1,P/N 31765,Optional Condensate Ol0 Drain Connection "U"Channel Access Panel in Duct Bottom of the Furnace Casing �--� Figure 11- #10 x 1-1/4 Bolt and uN t1_= "Gasket Install"U" Furnace �, 3/4"Pipe Waste Nut Channel on Terminate drain outside of the building.Provide a trap to prevent Sides of Duct "II"Channel of Connection Light Gauge Metal air from entering the combustion zone.Periodic cleaning of the Duct / condensate collection and disposal system is required. o 1' 9. Duct Connections (Applies to 0 ' Models HSC/SC, SCB, SCE) and should have standing seams or angle-iron braces.Joints should Propeller fan type unit heater(Model SCA)is not designed or approved • be S and drive strip,or locked. for installation with discharge ducts. Through Masonry Walls-No warm air duct should come in con- tact with masonry walls. Insulate around all air duct through ma- Models SCB and SCE are high static units and can be used with ducts. sonry walls with not less than 1/2"(1"is recommended)of insula- Remove factory-installed louver frame and louvers from SCB Models tion. before adding ductwork. • Through Unheated Space-Insulate all exposed warm air ducts Figure 9-Duct passing through an unheated space with at least 1/2"(1"is recom- Connection Dimensions- mended)of insulation. inches(mm) • Duct Supports-Suspend all ducts securely from adjacent buildings members. Do not support ducts from unit duct connections. ,i'+' 18 Size G • Duct Sizing-Proper sizing of the supply air ductwork is neces- i �: (457) 100 12-1/2(318) sary to ensure a satisfactory heating installation.The recognized authority,:, ! , 11 for such information is the Air ConditioningContractors 125 15-1/4 387 ( ) Association, 1228 17th Street N.W.,Washington,D.C.20036. A 150,175 20-3/4(527) manual covering duct sizing in detail may be purchased directly 200,225 26-1/4(667) from them. 3 4(19) 250,300 34-1/2(876) G'� 350 40(1016} CAUTION: An external duct system static pressure 400 45-i/2(1156) not within the limits shown on the rating plate,or 3/4...• improper motor pulley or belt adjustment, may (19) overload the motor. See Hazard Levels, page 2. Make adjustments required to obtain a temperature rise and static pres- • Removable Panels-The ducts should have removable access pan- sure within the ranges specified on the heater rating plate.Blower con- els on both upstream and downstream sides of the furnace.These nection and air flow requirements for Model SC/HSC duct furnaces openings must be accessible when the furnace is in service and are shown in Paragraphs 10 and 12. should be a minimum of 6"x 10"in size so smoke or reflected light Requirements and Suggestions for Connecting may be observed inside the casing to indicate the presence of leaks in the heat exchanger.The covers for the openings must be attached and Installing Ducts in such a manner as to prevent leakage.See Figure 10. • Type of Ductwork-The type of duct installation to be used de- • Horizontal Discharge Duct Length-A minimum horizontal duct pends in part on the type of construction of the roof(whether wood run of 24"is recommended before turns or branches are made in joist, steelbar joist,steel truss,pre-cast concrete)and the ceiling the duct system to reduce losses at the furnace outlet. (whether hung,flush,etc.). • Supply Air Duct/Furnace Horizontal Connection - The seal • Ductwork Material-Rectangular duct should be constructed of between the furnace and the duct must be mechanical.Duct connec- not lighter than No.26 U.S.gauge galvanized iron or No.24 B&S tion should be made with"U"type flanges on the top and bottom of gauge aluminum. the connecting duct. Slide the duct over the flanges of the heater • Ductwork Structure-All duct sections 24 inches or wider,and giving an airtight fit.Provide"U"type channels for the side flanges over 48 inches in length,should be cross broken on top and bottom to ensure tight joints.Use sheetmetal screws to fasten ducts and Form 406, Page 6