User Guide

Part number 550-100-400/0717
136
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Dimensions
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SERIES 4 GAS-FIRED WATER BOILER — Boiler Manual
Notes
1
Boiler supply and return tappings are both 1” NPT (Ultra-80/105/155/230) or 1¼” NPT (Ultra-299/310).
See page 10 for recommended piping sizes.
Wall-hung boiler option — water piping and gas pipe can only be routed through top of enclosure using wall-mounting kit. See
page 5 for mounting instructions.
2
Boiler circulator is shipped loose.
Circulator must be mounted in the return piping.
Both 1” and 1¼” circulator fl anges are shipped with boiler on Ultra-80/105/155/230.
Both 1¼” and 1½” circulator fl anges are shipped with boiler on Ultra-299/310 and Ultra-399.
3
Relief valve is shipped loose.
See page 9 for mounting details. Relief valve mounts on supply pipe off of supply tee and ¾” street elbow as shown.
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