Suburban DD-17DSI Service Manual
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Suburban DD-17DSI Service Manual

Rv furnaces
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Suburban
RV FURNACES
SERVICE MANUAL
DD-17DSI • DD-17DSIW
NT-12S/SE • NT-16S/SE • NT-20S/SE
NT-24SP • NT-30SP • NT-34SP
NT-40
P-30S/40
SF-20 • SF-25 • SF-30 • SF-35 • SF-42
SF-20F • SF-25F • SF-30F • SF-35F • SF-42F
SH-35 • SH-42
SH-35F • SH-42F
SHD-2542
SFV-35 • SFV-42
SFV-35F • SFV-42F
SUBURBAN MANUFACTURING COMPANY
676 Broadway Street
Dayton, Tennessee 37321
423-775-2131
Fax: 423-775-7015
www.rvcomfort.com
info1@suburbanmfg.com

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Summary of Contents for Suburban DD-17DSI

  • Page 1 DD-17DSI • DD-17DSIW NT-12S/SE • NT-16S/SE • NT-20S/SE Suburban NT-24SP • NT-30SP • NT-34SP NT-40 P-30S/40 RV FURNACES SF-20 • SF-25 • SF-30 • SF-35 • SF-42 SF-20F • SF-25F • SF-30F • SF-35F • SF-42F SH-35 • SH-42 SH-35F • SH-42F...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS Page General Service Inform ation ............3 Furnace Spec Sheet .

  • Page 3: General Service Information

    GENERAL SERVICE INFORMATION Suburban DYNATRAIL furnaces installed in recreational vehicles are classified as Direct Vent Sealed Com bustion Furnaces. A forced draft furnace utilizes a sealed com bustion cham ber which is vented to the outside atm osphere. The intake air for com bustion is also taken from outdoors and is com pletely isolated from the room air. A m otor is used to drive an im peller wheel to draw intake air into the cham ber to support com bustion and force the exhaust gases through the furnace cham ber to the outside atm osphere.

  • Page 4: Furnace Spec Sheet

    16,000 9 3/8" 9 3/8" 21-27 3/4" Electronic NT-20SE 19,000 9 3/8" 9 3/8" 21-27 3/4" Electronic DD-17DSI 17,000 12" 10 1/2" 22-29" Electronic Accessories Description 260197 Vent Kit 2" - 4" DD Models 260198 Vent Kit 4" - 6" DD Models 260199 Vent Kit 6"...

  • Page 5: Installation

    INSTALLATION There are several important aspects of the installation which will pertain to all Suburban forced draft furnaces, regardless of the model or the method in which they are installed. They are: Selecting a Location Venting Return Air Ducting Refer to the furnace installation manual for all installation requirements. Location and Installation- Locate the furnace near lengthwise center of the coach.

  • Page 6: Vent Assem Bly Illustrations

    VENTING Venting- By definition of a Direct Vent Sealed Combustion Furnace, it must be vented to the outside atmosphere and also draw combustion air from outdoors. Therefore, it is imperative that the vent be unobstructed and there must be a seal between the exhaust and intake (caulking) . Refer to the vent assembly installation in the manual.
  • Page 7 VENT ASSEMBLY INSTALLATION (SF and SH SERIES) Figure 3 Figure 3A SH and S H D -2542...
  • Page 8 VENT ASSEMBLY INSTALLATION (SF and SH SERIES) Figure 4 Figure 4A...
  • Page 9 VENT ASSEMBLY INSTALLATION (SFV) Figure 5 Figure 5A...
  • Page 10 Figure 6 Figure 6A...
  • Page 11 VENT ASSEMBLY INSTALLATION (DD SERIES) Note: Vent cap must be installed on DD furnace when bench testing. Figure 7...
  • Page 12 VENT ASSEM BLY INSTALLATION (NT SERIES) Figure 8 N T-12/16/20S E Figure 9 N T-12/16/20S and S E Figure 10 NT-12/16S...
  • Page 13 VENT ASSEM BLY INSTALLATION (NT SERIES) Figure 11 N T-20S Figure 12 N T-24/30/34S P P -30S...
  • Page 14 VENT ASSEM BLY INSTALLATION (NT SERIES) Figure 13 N T-24/30/34S P P -30 EXTENSION TUBE M IN./M AX. LENGTH KIT NUM BER (Extension Tube Range) 520498 2-1/4" to 3-1/8" 520499 3-1/8" to 4-7/8" 520500 4-7/8" to 7" 520501 7" to 9" Figure 14 N T-24/30/34S P P-30S...
  • Page 15 VENT ASSEM BLY INSTALLATION (NT-40 and P-40) Figure 16 N T-40 Figure 17 P -40...

  • Page 16: Return Air Illustrations

    Figure 18 N T-40 P -40 RETURN AIR Return Air - The cabinet that the furnace m ay be installed in will have louvers or openings for the return air back to the furnace. W hen the furnace is installed, it is im perative that the return air louvers on the furnace cabinet opening are not obstructed.

  • Page 17: Ducting Illustrations

    DUCTING Ducting - Suburban furnaces require that a m inim um duct area be m aintained throughout entire duct system including through the register. It is very im portant to adhere to the m inim um duct area in order to keep the furnace from cycling on high lim it and to assure proper operation of the sail switch (som etim es referred to as a m icroswitch.) NOTE: (Refer to the installation manual for the minimum ducted square inches area for each model.) NOTE: Ducts terminating in a dead air space (like holding tank compartments or cargo areas (Toy Boxes) w ith...

  • Page 21: Furnace Specifications (Dd, Nt And P Model Furnaces)

    FURNACE SPECIFICATIONS 12 VDC Input Motor Static C.F.M. Description Type Gas Voltage Amp Draw Model BTU/hr Diameter Pressure Max. DD-17DSI Direct 17,000 PROPANE 12 VDC 3" Discharge NT-12S Ducted 12,000 PROPANE 12 VDC 3" S - .1" wc S - 122...

  • Page 22: Furnace Specifications (Sf, Sfv, Sh, And Shd-2542 Model Furnaces)

    FURNACE SPECIFICATIONS 12 VDC Input Motor Static C.F.M. Description Type Gas Voltage Amp Draw Model BTU/hr Diameter Pressure Max. SF-20/20F Ducted 20,000 PROPANE 12 VDC 3" 6.5=2.5 in. .2" wc Motor 8.5=3 in. Motor SF-25/25F Ducted 25,000 PROPANE 12 VDC 3"...

  • Page 23: Sequence Of Operation (Tim E Delay Relay Equipped Furnaces)

    SEQUENCE OF OPERATION For Furnaces Equipped W ith Time Delay The therm ostat controls the operating circuit to the furnace by reacting to room tem perature to open and close a set of contact points which allows current to flow to the ON and OFF switch then to the relay.

  • Page 24: Sequence Of Operation (Fan Control Module Board (520820) Equipped Furnaces)

    Sequence of Operation for Fan Control Module Board Part Number 520820 Time Line Description - Sequence of Events Start The wall thermostat controls the operation of the furnace by reacting to room temperature, this allows current to flow through the On/Off switch to the module board. The module board constantly checks for a minimum 9.5 volts.

  • Page 25: Sequence Of Operation (24 Vac Fan Control Module Board (520947)

    Sequence of Operation for 24 VAC Fan Control Module Board Part Number 520947 Time Line Description - Sequence of Events Start The wall thermostat controls the operation of the furnace by reacting to room temperature, this allows current to flow through the On/Off switch to the module board. The module board must have a minimum 18 volts for normal operation.
  • Page 26 Sequence of Operations for SHD-2542 1st Stage Call for Heat The wall therm ostat controls the operation of the dual stage furnace by reacting to room tem perature. This allows current to flow through the On/Off switch to the Blower Speed Control Board then to the Module Board. The m odule board constantly checks for a m inim um 9.5 volts.

  • Page 27: Trouble Shooting Flow Chart (Furnaces Equipped With Tim E Delay Relay)

    TROUBLE SHOOTING GUIDE SUBURBAN RV FURNACES with TIME DELAY 12 VDC HEATING SECTION C heck therm ostat wire connections, C lean points, secure loose T herm ostat closes -N o- contact points and the heat -Yes- connections, replace therm ostat if anticipator.

  • Page 28: Trouble Shooting Flow Chart (Furnaces Equipped With Fan Control Module Board)

    TROUBLE SHOOTING GUIDE SUBURBAN RV FURNACE with FAN CONTROL MODULE BOARDS 12 VDC HEATING SECTION C heck therm ostat wire connections, C lean points, secure loose T herm ostat C loses -N o- contact points and the heat -Yes- connections, replace therm ostat if anticipator.

  • Page 29: Service Hints, Diagnosis And Corrective Measures

    SERVICE HINTS, DIAGNOSIS, AND CORRECTIVE MEASURES FO R TH E IG N ITIO N S YS TE M S O F S U B U R B AN 24 V O LT E LE C TR O N IC IG N ITIO N G AS FU R N AC E S W IT H T IM E D EL A Y CAUTIONS: 4.

  • Page 30: W Iring Diagram S

    Customer complains of unit going into lockout only once in When moisture in the gas system is suspected as being the problem, especially where the horizontal type gas bottle is being a while: used, the following steps should be take to prepare the gas a.
  • Page 31 Figure 23 R em ote Flam e Sense W ith Tim e Delay Figure 24 Local Flam e Sense (N T M odels) W ith Tim e Delay Fan C ontrol B oard Figure 25 (S F-20/25/30/35/42F)
  • Page 32 Figure 26 Local Flam e Sense (S F M odels) W ith Tim e Delay Figure 27 Fan C ontrol B oard (N T-12/16/20S and S E)
  • Page 33 Figure 28 Fan C ontrol B oard (N T-24/30/34SP and N T-40) Figure 29 Fan Control P -30S...
  • Page 34 Figure 30 Fan C ontrol B oard P -40...

  • Page 35: Furnace Removal

    FURNACE REMOVAL To replace parts or service the SUBURBAN fam ily of RV furnaces, it is necessary to follow these steps: DD-17DSI Turn off gas and power, then disconnect gas and power supply at the furnace. Label wires as necessary.
  • Page 36 FURNACE REMOVAL SF-20/25/30/35/42, SFV-20/25/30/35/42, SH-35/42 and SHD-2542 Rem ove the vent cap assem bly from the outside access door by rem oving applicable screws, also the four (4) screws retaining the door to the fram e. Rem ove the door to gain access to the furnace. Turn off gas and power, then disconnect gas and power supply at the furnace.

  • Page 37: Sf, Sh And Shd-2542 Electrode Gap Specifications & Positioning

    SF, SH AND SHD-2542 ELECTRODE GAP SPECIFICATIONS AND POSITIONING To assure consistent ignition of the burner, it is im portant for the electrode to be positioned properly over the top of the burner. W hen replacing the electrode, or should you be experiencing ignition type problem s, the electrode should be positioned as outlined in the drawing.

  • Page 38: Nt And Park Model Electrode Gap Specifications & Positioning

    NT ELECTRODE GAP SPECIFICATIONS AND POSITIONING To assure consistent ignition of the burner, it is im portant for the electrode to be positioned properly over the top of the burner. W hen replacing the electrode, or should you be experiencing ignition type problem s, the electrode should be positioned as outlined in the drawing.

  • Page 39: Maintenance

    MAINTENANCE Preventative m aintenance is essential if an RV owner is to have reliable, safe operation of his furnace. Two im portant areas to watch closely in order to assure safe, reliable operation are the venting and the m ain burner. An obstruction in the vent or m ain burner will reduce the com bustion air which results in incom plete com bustion.

  • Page 40: Cautions & Safety Information

    CAUTIONS & SAFETY INFORMATION Never use a battery charger to power or test an electronic ignition furnace as they som etim es provide m ore than 14.5 DC Volts that could dam age the m odule board. Never operate the furnace with the electrode wire disconnected nor with the electrode assem bly rem oved from the furnace.

This manual is also suitable for:

Dd-17dsiwNt-16s/seNt-20s/seNt-24spNt-12s/seNt-30sp ... Show all

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