Weil-McLain Ultra Commercial Installation And Start-Up Manual page 11

COMMERCIAL GAS
Prepare boiler
A
A
A
1 3
5
Heat
exchanger
11
12
Part number 550-100-086/0809
-
FIRED WATER BOILER
(continued)
is used on all Ultra-550 boilers, for both natural gas and propane.
is used on Ultra-750 propane, but NOT on natural gas.
MUST be installed on both the Ultra-550 and Ultra-750 to operate on propane.
Verify model number & fuel
Install plate with I. D. stamping toward front of boiler and facing blower
4
BACK
SIDE
13
14
— Boiler Manual
See opposite page for legend
3
Verify model number
9 8
or
2
7
or
10
6
11