-
gas
fired water boiler
Contents
Hazard definitions
The following defined terms are used throughout this manual to bring
attention to the presence of hazards of various risk levels or to important
information concerning the life of the product.
Indicates presence of hazards that will cause severe
personal injury, death or substantial property
damage.
Indicates presence of hazards that can cause severe
personal injury, death or substantial property
damage.
Indicates presence of hazards that will or can cause
minor personal injury or property damage.
Indicates special instructions on installation,
operation or maintenance that are important but
not related to personal injury or property damage.
2
Ultra at-a-glance
(see page 40 and page 42 for details of all models)
2
2
4
5
7
9
12
14
16
18
22
23
25
26
28
31
33
38
40
44
46
48
52
54
55
56
61
62
63
66
69
73
75
77
78
83
92
93
99
109
112
120
121
122
124
Part number 550-100-090/0809