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Part number 550-100-026/0404
GAS-FIRED WATER BOILER SERIES 2 — Boiler Manual
10
Figure 2a Installing propane orifice (Ultra-155,
Ultra-230 & Ultra-310
Series 2
)
Ultra-310 Series 2
Ultra-155 Series 1 and 2
Ultra-230 Series 1 and 2
Prepare for propane operation
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 2a).
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.
See the previous page for Ultra-
310
Series 1 and all Ultra-80 and
Ultra-105 model propane
instructions.