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Propeller Unit
Heaters/Unitary
17.4 to 705.6 MBh
Two Versatile Models - Various Sizes
Easy Installation
October 1999 UH-PRC001-EN
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Introduction The Clean-Line Appearance of the Model S Unit Heater The Industrial Designed Model P Unit Heater The square, compact design of the Yet, the benefits of this compact design What’s more, the Model P can be stored Model P and rectangular Model S allow standing on end. This means several go beyond ease of installation. They continue with attractive styling. The easy handling and installation. In most units can be loaded on a single skid for cases, only one person is needed to Model S un
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Contents Introduction 2 Features and Benefits 4 Application Considerations 8 Selection Procedure 11 Manual Selection Procedure 19 Model Number Description 21 Performance Data 23 Electric Power 44 Dimension and Weights 47 Mechanical Specifications 50 UH-PRC001-EN 3
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Features and Benefits Trane propeller unit heaters feature the S is available in 29 sizes with the largest selection of standard sizes from capacities from 17.4 MBh up to 404 MBh. any line in the industry. In fact, vertical Both are designed for durability, Model P and horizontal Model S unit attractiveness and compactness. These heaters provide enough ‘off-the-shelf’ features combined with economical selections to fit almost any application. operation, give strategically sized Trane The versat
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Features and Benefits The Model S Coil Compact Design The Model S unit heater features a Trane designed Model S and P propeller unique single tube serpentine coil. This unit heaters for easy installation and low ® compact, efficient coil has piping maintenance. The T rane Sigma-Flo fin connections at the back for added space design allows coil size to be reduced savings, convenience and appearance. while maintaining high capacity Model S single circuit coils use threaded performance equal to lar
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Features and Benefits Model P A Exclusive Trane designed aluminum fans C provide smooth, nonsurge performance. D This, in turn, provides efficient, quiet G operation. F B ® High performance Sigma-Flo fins in a B one-row coil have more efficient heat transfer characteristics than flat fin coils. C Steel pipe headers are electrically induction-brazed to coil tubes. E D A Top panel features knockout air ports that, when removed, convert the unit from standard to low final air temperature, higher cf
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Features and Benefits Model P Simple Hanger and Piping Connections The Model P uses weldnut type hanger connections, while the Model S uses a nutsert type hanger connection. Hanger rods screw easily into threaded anchor points. Piping connections can be made equally as easy. Model P units provide threaded connections for inlet and outlet, top and bottom. Fully Accessible for Easy Maintenance External Couplings Model S and P unit heaters are fully The Model S provides threaded accessible for main
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Application Considerations General Rules In locating or spotting Trane Propeller Unit Heaters – either the Model S Horizontal or Model P Projection Unit Heater – the following general rules should be considered. 1. Spot units at points of greatest heat loss. Blanket outside doorways effectively and provide ample coverage for exposed window areas. 2. Units, especially in the case of the Model S Horizontal Unit Heater, should be arranged to blow toward or along exposed walls, preferably striking t
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Application Considerations General Notes Hot Water System – Using Circulating The following general notes on piping Pump propeller unit heaters are presented Overhead supply and return mains are based on competent engineering and used with bottom connections to mains. installation practice: Manual vent (pet cock) is used at high 1. Suspend unit heaters securely with point on return main. Automatic air vent provisions for easy removal. may be substituted if desired. Refer to 2. Make certain units
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Application Considerations Table AC-1 - Model P Coil Face Area Unit Numbers Fin Area In Sq. Ft 42-P & P-L 1.20 64-P & P-L 1.49 80-P & P-L 1.98 102-P & P-L 3.28 122-P & P-L 3.28 146-P & P-L 3.88 166-P & P-L 4.85 202-P & P-L 4.85 252-P & P-L 6.52 280-P & P-L 6.52 336-P & P-L 6.52 384-P & P-L 7.82 500-P & P-L 8.72 600-P & P-L 11.63 Figure AC-4 720-P & P-L 13.08 Table AC-2 - Supply and Return Sizes at 2 Psi Capacity In Lbs. Of Size Of Size Of Steam Per Hour Supply Gravity Return 39 1” 3/4” 87 1 1/4”
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Selection Procedure Trane Propeller Unit Heaters Spacing of Units oversized heaters to extend the Both Model S and Model P Propeller It is the usual practice to divide the maximum effective mounting height of Unit Heaters are ideally suited to such a building into areas with like exposures, the Model P or the distance of throw of wide variety of installations that there or in relation to heat load distribution the Model S. Conversely, Trane Diffusers can be no hard and fast rules regulating desi
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Selection Procedure Formula Determining Final Temperature Example 1 The following formula is used to arrive at Given: Model 60S Horizontal Propeller Final temperature of air leaving Trane final air temperature volume when 70 F Unit Heater with a rated capacity of Unit Heaters may be determined as (Standard Air Basis) is known or vice 60,500 Btu at 2 lbs. steam with 60 F follows: versa: entering air. Inlet Air Temp. + Btu rating = FinalTemp Cfm at 70F x 1.085 Cfm at final
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Selection Procedure Model S Nomenclature UHS A 0 1 8 S 2 E A A 1 T A W D A D B E 123 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Digits 1,2,3 – Product Type Table SP-1 – Max. Mounting Heights and Distance of Throw for Model S Units (Based on 2 Lbs. Steam Pressure 60 F Entering Air) Maximum Throw Digit 4 – Development Sequence Final With Louver Fin Outlet Temp. Mounting Without Set for Uni
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Selection Procedure Model S Model P Maximum mounting heights for Model Maximum mounting heights for Model P S Unit Heaters are given in Table SP-1. Unit Heaters are given in Table SP-10, When equipped with standard Louver page 19. These distances are figured Fin Diffusers the distance of throw may from the floor line to the bottom plate of be increased as much as 25% by “toeing- the unit heater. Distance of throw in” the vertical blades. Where ceilings are unusually low, a decreases in proportio
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Selection Procedure Table SP-3 – Model S Horizontal Unit Heater Steam Capacities 2 Lbs. Steam 60 F Entering Air Temp Motor Motor BTU Condensate Final CFM 70 F Outlet Oper. Size HP RPM Per Hour EDR Lbs Per Hr Temp Air Basis Velocity Weight Standard Units 1050 17,400 72 18 117 280 162 18-S 1/50 950 16,600 69 17 118 266 154 40 800 13,900 58 14 118 224 130 1050 20,000 84 21 118 318 186 20-S2 1/50 950 19,000 79 20 120 298 173 40 800 15,500 64 17 120 250 145 1550 38,700 162 40 126 544 319 38-S 1/20 13
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Selection Procedure Table SP-4 – Model S Horizontal Unit Heater Steam Capacities con’t 2 Lbs. Steam 60 F Entering Air Temp Motor Motor BTU Condensate Final CFM 70 F Outlet Oper. Size HP RPM Per Hour EDR Lbs Per Hr Temp Air Basis Velocity Weight Low Final Temp. “Bypass” Units 1050 19,300 80 20 106 390 220 19-S2 1/25 950 18,300 77 19 108 360 205 40 800 16,300 68 17 110 300 173 1550 30,400 127 31 104 635 359 31-S 1/20 1300 27,800 116 29 109 520 302 40 1100 25,300 106 26 112 450 257 1550 45,800 191
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Selection Procedure Table SP-5 – Model P Projection Unit Heater Steam Capacities 2 Lbs. Steam 60 F Entering Air Temperature Motor Motor BTU Condensate Final CFM 70 F CFM at Outlet Oper. Size HP RPM Per Hour EDR Lbs Per Hr Temp. Air Basis Final Temp. Velocity Weight Lbs. Standard Models 42-P 1/25 1550 41,300 172 43 124 595 660 877 30 1150 33,600 140 35 131 436 495 658 64-P 1/20 1550 65,500 273 68 121 989 1085 1005 35 1150 52,800 220 55 129 706 785 727 80-P 1/20 1550 80,600 336 83 122 1200 1320 12
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Selection Procedure Model P Nomenclature Digit 15 – Fan Guard UHP A 0 4 2 P 4 C A A 1 T A R C A D B E Digit 16 – Unit Coating 123 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Digits 1,2,3 – Product Type Digit 10 – Design Sequence Digit 17 – Diffuser Digit 4 – Development Sequence Digit 11 – Tube Material Digit 18 – Manual Starter Digits 5,6,7 – Unit Size Digit 12 – Fin Material Digit
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Selection Procedure Table SP-10 - Maximum Mounting Heights in Feet for Model P Unit Heaters Hot Water Selection Example with and without Louver Cone Diffuser Selection Procedure Unit Steam Pressure (PSI) Unit Steam Pressure (PSI) Select the proper size of unit heater for Size 2 5 10 50 75 Size 2 5 10 50 75 whatever application desired, as 42-P 10.5 10.0 10.0 9.0 8.0 146-P-L 18.0 17.5 17.5 15.0 14.0 illustrated by the following examples. 12.5 12.0 12.0 11.0 10.0 22.5 22.0 21.5 18.5 18.0 42-P LS*
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Selection Procedure Step 4. Example 2 Step 4. Determine the pressure drop at 6.53 Determine the capacity of a Model 336P WTD = 27.5 x 0.546 = 15° GPM. Pressure drops are cataloged for unit heater operating at 180° (EWT), 100° Step 5. Btu/hr 123,000 both standard wall (SWT) and heavy (EAT) and 15° (WTD). GPM = = = 16.9 wall. (HWT) tube coils. In this example, if Step 1. 485xWTD (485)(15) a SWT coil is selected the pressure drop, Find conversion factor (in Table SP-11) 2.38 feet of water.
