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6-553.3
5H73889A (Rev. D)
April, 2002
INSTALLATION AND SERVICE MANUAL
gas-fired unit heaters
models PD and BD
All models approved for use in California by the CEC (when
equipped with IPI), in New York by the MEA division, and in
Massachusetts. Unit heater is certified for non-residential
applications.
Contents Pages
Inspection on arrival................................................................1
Installation (including venting)..............................................2-8
Operation ..
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INSTALLATION SPECIAL PRECAUTIONS THE INSTALLATION AND MAINTENANCE INSTRUCTIONS IN THIS 16. Modine unit heaters are designed for use in heating applications MANUAL MUST BE FOLLOWED TO PROVIDE SAFE, EFFICIENT with ambient temperatures between 32° F and 90° F If an AND TROUBLE-FREE OPERATION. IN ADDITION, PARTICULAR application exists where ambient temperatures can be expected to CARE MUST BE EXERCISED REGARDING THE SPECIAL fall outside of this range, contact factory for recommendations. PRECAUTION
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INSTALLATION In the U.S., the installation of these units must comply with the Combustion Air Requirements “National Fuel Gas Code,” ANSI Z223.1, latest edition (also known Units installed in tightly sealed buildings or confined spaces should as NFPA 54) and other applicable local building codes. be provided with two permanent openings, one near the top of the In Canada, the installation of these units must comply with local enclosure and one near the bottom. Each opening should have a plumbing
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INSTALLATION The PD 350 and PD 400 have four mounting holes. On all 5. Avoid venting through unheated space when possible. When blower units, except the PD 350 and PD 400, two tapped holes venting does pass through an unheated space, Modine are provided in the top of the unit and two holes in the blower recommends the use of Type B double wall vent. If single support bracket. The PD 350 and PD 400 have four tapped wall vent is used, insulate vent runs greater than 5 feet to holes in the top of t
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INSTALLATION ADDITIONAL VENTING REQUIREMENTS FOR VENTING 3. After threading and reaming the ends, inspect piping and INTO AN EXISTING MASONRY CHIMNEY OR COMMON remove loose dirt and chips. VENT (CATEGORY I and II UNITS ONLY) 4. Support piping so that no strains are imposed on unit or 1. Do not vent a Category I or II unit into a common vent with controls. mechanical draft systems operating under positive pressure 5. Use two wrenches when connecting piping to unit controls. (Category III or IV un
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INSTALLATION Table 3 Gas Pipe Capacities In Cu. Ft. per Hour with Pressure Drop pf 0.3 in. W.C. with Specific Gravity 0.60. Length of Diameter of Pipe - Inches Pipe in Ft. 1/2 3/4 1 1 1/4 1 1/2 2 3 4 6 8 15 76 218 440 750 1220 2480 6500 13880 38700 79000 30 73 152 285 590 890 1650 4700 9700 27370 55850 45 44 124 260 435 700 1475 3900 7900 23350 45600 60 50 105 190 400 610 1150 3250 6800 19330 39500 75 97 200 345 545 1120 3000 6000 17310 35300 90 88 160 320 490 930 2600 5400 15800 32250 105 80 16
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INSTALLATION Dimension “B” Should Never Recommended Installations Be Less than 1/2 of “A” A B C 3" MAX. TURNING VANES 12" 3" MIN. MIN. 12" 3" MIN. B B MIN. 12" A 3" MAX. A A TURNING VANES B 12" MIN. BAFFLE TOP VIEW SIDE VIEW SIDE VIEW D E F 12" 12" MIN. MIN. B B A TURNING A VANES TURNING BAFFLE VANES BAFFLE SIDE VIEW SIDE VIEW TOP VIEW pressure drop of the nozzles can be found footnoted at the Installation of Blower Models (BD UNITS) bottom of page 14. If filters, nozzles or ductwork are to be u
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INSTALLATION adjustable motor sheave is supplied with these units. If blower To Install (Figure 5) fan speed changes are required, adjust motor sheave as 1. Remove and discard the motor tie down strap and the follows: shipping block beneath the belt tension adjusting screw (Not used on all models.) NOTE: Do not fire unit until blower adjustment has been made Figure 5 or unit may cycle on limit (overheat) control. Blower Model 1. Shut-off power before making blower speed adjustments. Refer to Det
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OPERATION Figure 7 Correct Pilot Flame CAUTION Start-up and adjustment procedures should be performed by a qualified serviceman. Check the gas inlet pressure at the unit upstream of the combination gas control. The inlet pressure should be 6"-7" W.C. on natural gas or 12"-14" W.C. on propane. If inlet pressure is too high, install an additional pressure regulator upstream of the combination gas control. The pilot flame must be adjusted as described below. Purging of air from gas lines, piping, a
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OPERATION Lack of primary air will cause soft yellow-tipped flames. Excess where: primary air produces short, well-defined flames with a tendency F1 = input to heater, Btuh. to lift off the burner ports. Proper operation with natural gas F2 = input to heater, cu. ft. per hr. provides a soft blue flame with a well-defined inner core. C = heating value of gas, Btu per cu. ft. To increase primary air, loosen the manifold mounting screws and tap the manifold away from the mixer tubes until yellow- T
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Table 6 CHECKING INPUT RATE Manifold Pressure & Gas Consumption * Figure 9 Natural Propane BTU/Cu. Ft. 1050 2500 No. of Major Gas and Electric Components Model Specific Gravity 0.60 1.53 Orifices FAN MOTOR Manifold Pressure In. W.C. 3.5 10.0 FAN GUARD CFH 28.6 12.0 Gal/Hr. Propane – .33 PILOT TUBING PD 30 Sec/cu. ft. 126 300 1 Orifice Drill Size 38 52 CFH 47.6 20.0 PD 50 Gal/Hr. Propane – .55 BD 50 Sec/cu. ft. 76 180 1 Orifice Drill Size 30 45 CFH 71.4 30.0 COMBINATION PD 75 Gal/Hr. Propane – .8
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DIMENSIONS/PERFORMANCE – PD A C H F K W X K J VENT PIPE G AA For clearance to combustibles, see page 3. B E BB EE LL D (OPENING) L - Approx MIN. DISTANCE L TO WALL IS L + 6" (MIN. DISTANCE TO WALL) Dimensions (inches) — PD Do not use propeller units with duct work. Dimension Model Number Symbol PD 30 PD 50 PD 75 PD 100 PD 125 PD 150 PD 175 PD 200 PD 250 PD 300 PD 350 PD 400 A 12-7/8 17-1/4 17-1/4 19-1/4 19-1/4 21 23-1/2 25-5/8 25-5/8 28-5/8 33-5/8 40 B 24-1/4 24-1/4 28-3/4 28-3/4 35-1/4 35-1/4 3
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DIMENSIONS/PERFORMANCE – BD C A F N EE H W X P 4-5/8'' K S J VENT PIPE G O AA For clearance to combustibles, see page 3. K QxV E B RxT BB BLOWER FILTER RACK ENCLOSURE M (APPROX.) (OPTIONAL) D (OPENING) (OPTIONAL) L (MIN. DISTANCE TO WALL) Dimensions (inches) — BD Model Number Dimension Symbol BD 50 BD 75 BD 100 BD 125 BD 150 BD 175 BD 200 BD 250 BD 300 BD 350 BD 400 A 17-1/4 17-1/4 19-1/4 19-1/4 21 23-1/2 25-5/8 25-5/8 28-5/8 33-5/8 40 B 24-1/4 28-3/4 28-3/4 35-1/4 35-1/4 35-1/4 40-1/4 40-1/4 40
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PERFORMANCE DATA – NOZZLES A choice of four air discharge nozzles 90° VERTICAL accommodate various heat throw NOZZLE patterns illustrated. Equipped with adjustable louver blades, nozzles are fabricated from galvanized steel and are offered either unpainted or painted to match the finish of the blower unit heaters. Nozzles are flanged for easy attachment over the air discharge opening of the H blower unit heater. H T S S S 40° DOWNWARD NOZZLE 5-WAY NOZZLES T T H S 40° SPLITTER NOZZLE S S Mounting
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DIMENSIONAL DATA A A 3 /4" 3 /4" B B D D C C 40° 40° Downward Nozzles Splitter Nozzles A A /4" 3 /4" B B D D C C 90° 5-Way Downward Nozzles Nozzle Dimensions (in inches) Model Number Nozzle Dimension Symbol Type BD 50 BD 75 BD 100 BD 125 BD 150 BD 175 BD 200 BD 250 BD 300 BD 350 BD400 A 14-13/16 14-13/16 16-13/16 16-13/16 18-9/16 21-1/16 23-3/16 23-3/16 26-3/16 31-1/8 37-1/2 40° Downward B 13 16 16 20 20 20 24 24 24 24 24 Nozzle C 20 24 22 26 26 25 30 30 30 36 36 D 3-1/2 4 3 4 4 4 4 4 6 11 11 A
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PERFORMANCE DATA – HOODS FOR PROPELLER MODELS Performance Data — 30°, 60° and 90° Downward Deflector Hoods Mounting Height to 30° Downward Hood For Propeller Units ➀ Bottom of Heater PD 50 PD 75 PD 100 PD 125 PD 150 PD 175 PD 200 PD 250 PD 300 PD 350 PD 400 Models X Y Z X Y Z X Y Z X Y Z X Y Z X Y Z X Y Z X Y Z X Y Z X Y Z X Y Z 8' 8 19 26 11 25 34 14 31 43 15 32 44 16 36 49 18 38 52 15 33 45 21 44 60 24 49 67 22 46 63 22 45 62 10' 6 15 22 9 23 22 13 30 41 14 31
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PERFORMANCE DATA – HOODS FOR BLOWER MODELS Performance Data — 30°, 60° and 90° Downward Deflector Hoods Mounting Height to 30° Downward Hood For Blower Units ➁ Bottom of Heater BD 50 BD 75 BD 100 BD 125 BD 150 BD 175 BD 200 BD 250 BD 300 BD 350 BD 400 Models X Y Z X Y Z X Y Z X Y Z X Y Z X Y Z X Y Z X Y Z X Y Z X Y Z X Y Z 8' 13 29 40 18 38 52 22 47 64 23 47 64 26 53 72 28 56 76 24 50 68 31 63 86 35 69 94 37 73 99 30 61 84 10' 12 28 38 16 37 50 21 46 63 21 46 63 25
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PERFORMANCE DATA - BLOWER UNIT HEATERS Models With or Without Blower Enclosure ➀ ➁ ➂ ➃ ➄ For 575V selections, please see chart on page 19. 0.4 Static Pressure 0.0 Static Air Pressure 0.1 Static Air Pressure 0.2 Static Air Pressure 0.3 Static Air Pressure Sheave Temp Sheave Sheave Sheave Sheave RPM HP Drive Turns Model Rise Airflow RPM HP Drive Turns RPM HP Drive Turns RPM HP Drive Turns RPM HP Drive Turns No. Open No. (°F) (cfm) No. Open No. Open No. Open No. Open 40 926 720 1/4 C183 2 800 1/3 C
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PERFORMANCE DATA - CONTINUED Models With or Without Blower Enclosure ➀ ➁ ➂ ➃ ➄ Data for use with filters only Filters 0.5 Static Air Pressure 0.6 Static Air Pressure 0.7 Static Air Pressure For blower units with enclosure and filter, add Temp Sheave Sheave Sheave the following static pressures to the static Model Rise Airflow RPM HP Drive Turns RPM HP Drive Turns RPM HP Drive Turns pressure determined by the system designer No. (°F) (cfm) No. Open No. Open No. Open for total external static pres
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SERVICE INSTRUCTIONS – SAFETY DEVICES (FRONT, TOP VIEW) Figure 13 Service, Safety, and Other Major Unit Heater Components VENT BLOCKED LIMIT CONTROL VENT PIPE VENT SAFETY LOCATED UNDER CONNECTION SWITCH RELIEF LEFT SIDE PANEL OPENING DIMPLED FAN HEAT MOTOR EXCHANGER FOR LOUVERS SERVICE, REMOVE LEFT SIDE PANEL PILOT TUBING TERMINAL BOARD JUNCTION COMBINATION BOX GAS CONTROL COMBUSTION AIR INLETS & BURNER Limit Control (Overheat Switch) the left outer side panel, held in place by screws at the rea
