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Figure 1 Gas component locations
DO NOT adjust or attempt to measure gas
valve outlet pressure. The gas valve is
factory-set for the correct outlet pressure.
This setting is suitable for natural gas and
propane, requiring no field adjustment.
Attempting to alter or measure the gas
valve outlet pressure could result in
damage to the valve, causing potential
severe personal injury, death or substantial
property damage.
You must read and have the Ultra Boiler Manual with you to
proceed with these instructions.
Install propane gas orifice
1. Turn off electrical power to boiler at external line switch or breaker.
2. Remove jacket front door by removing two knurled head screws at
lower front.
3. Lift door away from boiler to remove.
4. Shut off gas to boiler by closing the manual gas valve (Figure 1).
5. Remove propane orifice disc from conversion kit envelope. Read the
stamping on the orifice.
The orifice stamping must agree with the boiler size (see
front page). DO NOT proceed with installation if orifice is
incorrect. Installing the wrong orifice could result in severe
personal injury, death or substantial property damage.
6. Disconnect the gas line union (Figure 1).
7. Remove (3) star-drive screws securing gas valve to venturi (Figure 2).
8. Place orifice in the black rubber grommet in the gas valve outlet port
(Figure 2).
9. Reposition gas valve against venturi and replace (3) screws securing
valve to venturi.
10. Reconnect gas line union.
11. DO NOT ADJUST gas valve pressure. See WARNING, bottom right.
12. Perform leak test and gas pressure checks given on page 19 of Boiler
manual. Verify gas pressure at gas valve inlet pressure tap is in the range
given on the front page of this document and in Boiler Manual.
Perform Boiler Manual start-up
Follow all instructions in Boiler Manual Section 7, pages 24
through 30, to start-up the boiler after converting for
propane. Because the boiler has been changed, you must
verify correct operation, including checking combustion
with test instruments both at high fire and low fire as
described in the Boiler Manual. Failure to comply could
result in severe personal injury, death or substantial property
damage.
Replace boiler jacket front door
Replace boiler jacket front door after 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.
Apply conversion label
1. After installation is complete, attach the propane conversion label (in
instruction manual envelope) next to the boiler rating plate.
GAS-FIRED WATER BOILER — Propane Conversion Instructions
Part number 550-141-951/1002
Figure 2 Installing propane orifice