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UL 391:5ED 2010-09-10
Current
The latest, up-to-date edition.
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Standard for Solid-Fuel and Combination-Fuel Central and Supplementary Furnaces
Hardcopy
10-09-2010
Foreword
Introduction
1 Scope
2 Units of measurement
3 Glossary
4 Components
Construction
5 General
6 Accessibility for servicing
7 Protection of users and service personnel
8 Base
9 Casings
10 Radiation shields or liners
11 Materials in air-handling compartments
12 Air filters
13 Combustion chambers
14 Radiators
15 Heating surface joints
16 Baffles
17 Flue collars
18 Disposal of combustion products
19 Dampers, shutters and draft regulators
20 Electrical enclosures
21 Accessibility of uninsulated live parts, film-coated
wire and moving parts
Field wiring
22 General
23 Leads and terminals
Internal wiring
24 General
25 Methods
26 Short-circuit protection
27 Separation of circuits
28 Bonding for grounding
Electrical components
29 General
30 Mounting of electrical components
31 Electrical insulating material
32 Capacitors
33 Motors and motor (overload) protection
34 Safety controls and circuits
35 Switches and controllers
Spacings
36 High-voltage circuits
37 Low-voltage circuits
Performance
38 General
Test installation for central furnaces
39 Enclosure
40 Chimney connectors
41 Supply- and return-air plenums and ducts - forced-
air furnace
Test installation for supplementary central furnaces
42 General
Instrumentation
43 Draft
44 Fuel input
45 Power measurement
46 Speed measurement
47 Static pressure
48 Temperature measurement
Initial test conditions
49 General
50 Static pressures for tests
51 Solid fuels and test firing procedures
Initial tests
52 Combustion test - oil burner and furnace
53 Operation test
54 Limit control cutout test
Temperature tests
55 General
56 Continuous operation test
57 Air flow restriction and disruption tests
Other tests
58 Delayed oil ignition test
59 Dielectric voltage withstand test
60 Bonding joint test
61 Bonding conductor test
62 Knockout security test
63 Lead stress test
64 Surface burning test
65 Polymeric materials test
66 Short circuit test
Manufacturing and production tests
67 General
68 Production line dielectric voltage withstand tests
Marking
69 Nameplate
70 Supplementary
71 Instructions
Appendix
A Standards for components
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