Suburban DD-17DSI, Service Manual

Page: 2 / 48

2
TABLE OF CONTENTS
Page
General Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Furnace Spec Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Vent Assembly
Illustrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16
Return Air Illustrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Ducting Illustrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Installation Requirements (DD, NT and P Model Furnaces) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Installation
Requirements (SF, SH and SHD-2542 Model Furnaces) . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Installation Requirement (SFV Model Furnaces) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Furnace
Specifications (DD, NT and P Model Furnaces) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Furnace Specifications (SF, SFV, SH, and SHD-2542 Model Furnaces) . . . . . . . . . . . . . . . . . . . . . . . 22
Sequence of Operation (Time Delay Relay Equipped Furnaces) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Sequence of Operation (Fan Control Module Board (520820) Equipped Furnaces) . . . . . . . . . . . . . . . 24
Sequence of Operation (24 VAC Fan Control Module Board (520947) . . . . . . . . . . . . . . . . . . . . . . . . . 25
Sequence of Operation (SHD-2542 Furance) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Trouble Shooting Flow Chart (Furnaces Equipped with Time Delay Relay) . . . . . . . . . . . . . . . . . . . . . 27
Trouble Shooting Flow Chart (Furnaces Equipped with Fan Control Module Board) . . . . . . . . . . . . . . 28
Service Hints, Diagnosis and Corrective Measures for Suburban 24-Volt AC Electronic Ignition Furnaces . . . . . . . . .
. . . . . . . . . . . . . . . . . . . 29-30 Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . 30-34
Furnace Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35-36
SF, SH and SHD-2542 Electrode Gap Specifications & Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
NT and Park Model Electrode Gap Specifications & Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Cautions & Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Back Cover
NOTE: Our service technicians are available to assist you in making repairs or parts replacements from 8:00
a.m. to 5:00 p.m. Eastern Standard Time, Monday through Friday (except holidays), by calling 423-775-2131
extension 7102. E-mail address: info1@suburbanmfg.com
GENERAL SERVICE INFORMATION
Suburban DYNATRAIL furnaces installed in recreational vehicles are classified as Direct Vent Sealed Combustion Furnaces. A
forced draft furnace utilizes a sealed combustion chamber which is vented to the outside atmosphere. The intake air for
combustion is also taken from outdoors and is completely isolated from the room air. A motor is used to drive an impeller wheel
to draw intake air into the chamber to support combustion and force the exhaust gases through the furnace chamber to the
outside atmosphere. A second impeller wheel (driven by the same motor yet totally isolated from the combustion air) is used to