S
4
®
ERIES
Contents
Prepare boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
DIRECT VENT . . . . . . . . . . . . . . . . . . . . . . . . . 25
Gas piping . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Hazard defi nitions
The following defi ned 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
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GAS
FIRED WATER BOILER
Ultra at-a-glance
(see page 44 and page 46 for details of all models)
Part number 550-100-090/1113