Installation Guide
Part number 550-100-066/0608
g a s -f i r e d w at e r b o i l e r — Boiler Manual
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Replacement parts
Replacement parts must be purchased through a local Weil-McLain distributor. When ordering,
specify boiler model and size and include description and part number of replacement part.
Results from using modified or other manufactured parts will not be covered by warranty and
may damage boiler or impair operation.
Weil-McLain part numbers are found in Weil-McLain Boilers and Controls Repair Parts Lists.
. Use care when handling these materials per
instructions on page 79 of this manual. Failure to comply could result in severe personal in-
jury.
Reinstall boiler jacket front door after startup or servicing
Inspect boiler jacket from door gaskets and reinstall boiler jacket front door after start or
servicing. The boiler front door must be securely fastened to the boiler to prevent boiler from
drawing air from inside the boiler room. This is particularly important if the boiler is located
in the same room as other appliances. Failure to keep the door securely fastened could result in
severe personal injury or death.
Propane conversion kits and instructions
The conversion kits listed below are only for use with Ultra Series 3 boilers. For series 1 or series 2
boilers, refer to the boiler manual or contact Weil-McLain for the correct parts.
SERIES 3 BOILERS ONLY
383-501-020
In kit only
Ultra-80LP 383-500-644
See page 10
or kit
540-100-001
Supplied with boiler
See page 10 Ultra-105 383-500-645
See page 10
or kit
383-500-115
Supplied with boiler
See page 10 Ultra-155 383-500-646
See page 10
or kit
383-500-120
Supplied with boiler
See page 10 Ultra-230 383-500-647
See page 10
or kit
540-202-831
Supplied with boiler
See page 10 Ultra-310 383-500-648
See page 10
or kit
383-501-021
In kit only
Contact factory
Boilers marked with this symbol require special installation procedures. Do not use the instructions in this manual — use
only the instructions supplied in the conversion kit.