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Part number 550-101-233/0903
GAS-FIRED WATER BOILER — Boiler Manual
10
Figure 2a Installing propane orifice (Ultra-155
and Ultra-230)
Prepare for propane if operating
on propane — Ultra-155 to -230
Ultra-80: DO NOT apply the following
instructions to conversion of Ultra-80
boilers. Follow the instructions provided
with the optional propane conversion kit.
The propane conversion kit is NOT
included as standard equipment for the
Ultra-80.
Do not apply the following to conversion
of a boiler already installed and connected
to gas supply. For a boiler already installed,
you must turn off gas supply, turn off
power and allow boiler to cool before
proceeding. You must also completely test
the boiler after conversion to verify
performance as described under “Startup,”
Section 6 of this manual. See separate
natural to propane conversion instructions
for conversion of an existing boiler.
You must install the propane orifice to fire
the Ultra boiler on propane. Verify when
installing that the orifice size marking
matches boiler size. Failure to comply could
result in severe personal injury, death or
substantial property damage.
1. With boiler on its back, remove jacket front door by
removing two knurled head screws at lower front.
Then lift door away from boiler.
2. Disconnect the gas valve electrical plug.
3. Disconnect the gas line union below the gas valve.
4. Remove (3) TORX screws securing gas valve to venturi
(Figure 2a).
5. Locate propane orifice disc from conversion kit bag.
Verify that the stamping on the orifice disk matches
the boiler size. Place orifice in the black rubber
grommet in the side of the gas valve and secure in
valve (Figure 2).
6. Reposition gas valve against venturi and replace (3)
TORX screws securing valve to venturi. Reconnect
gas line union.
7. DO NOT attempt to adjust gas valve outlet pressure.
8. Connect gas valve electrical plug to valve terminals.
9. After installation is complete, attach the propane
conversion label (in conversion kit bag) next to the
boiler rating plate.
10. Replace jacket front panel.
Prepare boiler
(continued)
2
Placing floor-mounted boilers
1. Set boiler in place and check level.
a. Adjust legs, if necessary to level boiler.
Placing wall-mounted boilers
1. Ultra-80, -105, -155 and -230 boilers can be wall
mounted. Use only the separately available Ultra
boiler wall mounting kit and instructions. See
WARNING below.
The wall must be vertically plumb and
capable of carrying the weight of the boiler.
The operating weights are:
Ultra-80: 139 pounds.
Ultra-105: 145 pounds.
Ultra-155: 181 pounds.
Ultra-230: 192 pounds.
Model Ultra-310 boilers are NOT designed
for wall mounting.
Wall mount Ultra boilers only using Weil-
McLain Ultra boiler wall-mounting kit and
accompanying instructions. This kit is not
supplied as standard equipment with the
boiler, and must be purchased separately.
Failure to comply with above could result
in severe personal injury, death or
substantial property damage.
Ultra-310 boilers cannot be equipped for
propane firing as of October, 2003.
Propane capability should be available in
2004.