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Modine Manufacturing DFP Installation And Service Manual

Manual is about: gas-fired indoor power vented duct furnaces

Summary of DFP

  • Page 1

    5-564 caution to prevent premature heat exchanger failure do not locate any gas-fired units in areas where chlorinated, halogenated, or acid vapors are present in the atmosphere. December, 2008 installation and service manual gas-fired indoor power vented duct furnaces model dfp 5-564 5h080637a this...

  • Page 2: Danger

    5-564 2 special precautions the installation and maintenance instructions in this manual must be followed to provide safe, efficient and trouble-free operation. In addition, particular care must be exercised regarding the special precautions listed below. Failure to properly address these critical a...

  • Page 3: Danger

    5-564 unit location location recommendations 1. When locating the furnace, consider general space and heating requirements, availability of gas and electrical supply, and proximity to vent locations. 2. Unit must be installed on the positive pressure side of the circulating blower. 3. Be sure the st...

  • Page 4: Important

    5-564 unit suspension be sure the means of suspension is adequate to support the weight of the unit (see dimensional data for unit weights). For proper operation, the unit must be installed in a level horizontal position. Combustible material and service clearances as specified in figure 3.1 and tab...

  • Page 5

    5-564 5 installation figure 5.1 - typical duct & airflow installation recommenced installations dimensions “b” should never be less than 1 ¼ 2 of “a”. C a f e d b 12" min. 12" min. 12" min. 12" min. 12" min. 12" min. 24" min. 24" min. 3" min. 3" max. 3" max. 3" max. 15° max. 15° max. 15° max. Air ba...

  • Page 6: Warning

    6 5-564 7. Avoid venting through unheated space. When venting does pass through an unheated space, insulate runs greater than 5 feet to minimize condensation. Inspect for leakage prior to insulating and use insulation that is noncombustible with a rating of not less than 350°f. Install a tee fitting...

  • Page 7

    7 5-564 additional requirements for horizontally vented category iii units 1. Seal the joints with a metallic tape or silastic suitable for temperatures up to 350°f. (3m tapes 433 or 363 are acceptable.) wrap tape two full turns around the vent pipe. 2. Refer to table 7.2 for total minimum and maxim...

  • Page 8: Warning

    8 5-564 gas pipe capacities (up to 14” w.C. Gas pressure through schedule 40 pipe) cubic feet per hour with pressure drop of 0.3” w.C. Natural gas - specific gravity - 0.60 propane gas - specific gravity - 1.50 length pipe diameter of pipe 1/2" 3/4" 1" 1-1/4" 1-1/2" 2" (feet) natural propane natural...

  • Page 9: Warning

    9 5-564 electrical connections 1. Installation of wiring must conform with local building codes, or in the absence of local codes, with the national electric code ansi/nfpa 70 - latest edition. Unit must be electrically grounded in conformance to this code. In canada, wiring must comply with csa c22...

  • Page 10

    10 5-564 pilot burner adjustment the pilot burner is orificed to burn properly with an inlet pressure of 6-7" w.C. On natural gas and 11-14" w.C. On propane gas, but final adjustment must be made after installation. If the pilot flame is too long or large, it is possible that it may cause soot and/o...

  • Page 11

    11 5-564 air shutter adjustment proper operation provides a soft blue flame with a well-defined inner core. A lack of primary air will reveal soft yellow-tipped flames. Excess primary air produces short, well-defined flames with a tendency to lift off the burner ports. For both natural and propane g...

  • Page 12: Important

    12 5-564 start-up procedure control operating sequence indoor power vented duct furnaces are supplied with intermittent pilot systems with continuous retry as standard. On mechanical modulation systems the main burner is turned off 100% when the thermostat is satisified, but the pilot remains lit. F...

  • Page 13

    13 5-564 electronic modulating gas controls single furnace utilizes an electronic modulating/regulating gas control, combination gas valve, an ignition control, modulating amplifier, and either a modulating room thermostat or modulating duct thermostat with remote temperature set point adjuster. The...

  • Page 14

    14 5-564 ➅ air flow proving switch the air flow proving switch is factory installed in the duct furnace electrical junction box. The air flow proving switch monitors the pressure differential between the duct furnace and the atmosphere. The purpose of the air flow proving switch is to cut power to t...

  • Page 15

    15 5-564 dimensional data table 15.1 - indoor power vented duct furnace dimensions (all dimensions in inches) model size dimensions 75 100/125 150/175 200/225 250/300 350/400 a 15.41 17.90 22.16 24.29 27.33 38.83 b 33.05 33.05 33.05 37.05 37.05 37.05 c (standard) 22.43 22.43 22.43 24.09 24.09 24.09 ...

  • Page 16

    16 5-564 air temperature rise through unit (°f) model btu/hr 20 ➂ 40 ➂ 50 ➂ 60 65 70 75 80 85 90 95 100 ➃ size input output max min 75 75,000 60,000 2778 1389 1111 926 855 794 741 694 654 617 585 556 100 100,000 80,000 3704 1852 1481 1235 1140 1058 988 926 871 823 780 741 125 125,000 100,000 4630 23...

  • Page 17

    17 5-564 pressure drop curves figure 17.1 - indoor duct furnace without baffle pressure drop vs cfm curves 0 0.2 0.4 0.6 0.8 1 1.2 1.4 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000 cfm pressure drop ( Δ p " w.C.) 75 100/125 150/175 200/225 250/300 350/400 caution...

  • Page 18: Important

    18 5-564 duct furnace when providing annual maintenance for the duct furnace, keep the unit free from dust, dirt, grease and foreign matter. Pay particular attention to: 1. The exhaust vent piping and vent terminal. 2. The burner ports and pilot burner orifices (avoid the use of hard, sharp instrume...

  • Page 19

    19 5-564 burner side access panel manifold electrical junction box serial plate maintenance burner and pilot assembly removal to remove the burner 1. Shut off gas and electric supply. 2. Disconnect the pilot supply line from the gas valve. 3. Disconnect the ignition cable from the ignition controlle...

  • Page 20

    20 5-564 service & troubleshooting trouble possible cause possible remedy table 20.1 - troubleshooting power exhauster motor will not start 1. Power supply is off. 2. No 24v power to thermostat. 3. Thermostat malfunction. 4. Defective power exhauster relay. 5. Defective power exhauster motor. 1. Tur...

  • Page 21

    21 5-564 ➀ automatic reset high limit the duct furnace comes standard with an automatic reset high limit switch that will shut-off the gas should the discharge air temperature become excessive. See figure 14.1, indicator ➆ for the location of either the standard automatic or optional manual reset hi...

  • Page 22

    22 5-564 replacement parts ordering ordering when servicing, repairing or replacing parts on these units, locate the serial plate of the unit and always give the complete model number and serial number from the serial plate. The serial plate is located on the door of the electrical control box or mo...

  • Page 23

    23 5-564.

  • Page 24

    Commercial products group modine manufacturing company 1500 dekoven avenue racine, wi 53403 phone: 1.800.828.4328 (heat) www.Modine.Com litho in usa © modine manufacturing company 2008 commercial warranty seller warrants its products to be free from defects in material and workmanship, exclusive, ho...