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GAS-FIRED WATER BOILER SERIES 2 — Boiler Manual
Part number 550-100-026/0404
43
10
Dimensions
1. Boiler supply and return tappings are both 1" NPT (Ultra-
80/105/155/230) or 1¼" NPT (Ultra-310). See pages 14
through 18 for recommended system supply and return
piping sizes. Wall-hung boilers: water piping and gas pipe
can be routed through bottom of enclosure using wall-
mounting kit.
2. Boiler circulator is shipped loose. Circulator may be
mounted on either boiler supply or return piping. Both 1"
Notes
and 1¼" circulator flanges are shipped with boiler on Ultra-
80/105/155/230. Both 1¼" and 1½" circulator flanges are
shipped with boiler on Ultra-310.
3. Relief valve is shipped loose. See page 11 for mounting
details. Relief valve mounts on supply pipe off of supply
tee and ¾" street elbow as shown.