UL 727:10ED 2018-01-31

FOREWORD
PART 1 - ALL PRODUCTS
Introduction
1 Scope
2 Units of measurement
3 Glossary
4 Components
Construction - mechanical
5 Assembly
6 Servicing
7 Disposal of combustion products
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 Dampers and draft regulators
Construction - electrical
19 Controls
20 Field wiring
21 Internal wiring
22 Separation of circuits
23 Bonding for grounding
24 Servicing and adjustments
25 Electrical components
26 Mounting of electrical components
27 Electrical enclosures
28 Motors and motor overload protection
29 Overcurrent protection of high-voltage control-
    circuit conductors
30 Overcurrent protection of transformers
31 Switches and controllers
32 Capacitors
33 Electrical insulating material
34 Spacings - high-voltage circuit
35 Spacings - low-voltage circuit
36 Accessibility of uninsulated live parts
Performance
37 General
38 Test installation for standard clearances
39 Test installation for alcove or closet
40 Instrumentation
41 Initial test conditions
42 Combustion test - burner and furnace
43 Operation tests
44 Limit control cutout test
45 Continuity of operation test
46 Airflow, downflow or horizontal furnace test
47 Temperature tests
48 Continuous operation test
49 Blocked inlet test
50 Fan failure test
51 Stalled fan motor test
52 Blocked outlet test
53 Short-circuit test
54 Overload test, high-voltage transformers
55 Burnout test, high-voltage transformers
56 Dielectric voltage-withstand test
57 Flammability test
Manufacturing and production tests
58 General
59 Production line dielectric voltage-withstand test
Marking
60 General
Instructions
61 Operating and installation instructions
PART 2 - OUTDOOR-USE EQUIPMENT
Construction
62 General
63 Enclosure
64 Field-wiring connections
65 Internal wiring
66 Electrical insulating material
Performance
67 Rain test
68 Wind test
69 Accelerated aging test - gaskets, adhesives, and
    sealing compounds
70 Metallic coating thickness test
Marking
71 General
Appendix
A Standards for components

This New Edition of UL 727 is being issued to address the editorial maintenance of UL Standards for Safety.

These requirements cover oil-fired central furnaces which include forced-air furnaces of the downflow, horizontal, and upflow types.