Specifications

Part number 550-100-090/0809
g a s -f i r e d w a t e r b o i l e r — Boiler Manual
34
To start the boiler
Turn OFF the boiler ON/OFF switch.1.
Read and follow the Operating Instructions, 2. Fig-
ure 36, page 35.
The U-Control display will show installed sensors 3.
when first powered. Make sure the right sensors are
detected. If not, determine the cause and correct
before proceeding.
If boiler does not start correctly
Check for loose connections, blown fuse or service 1.
switch off?
Is external limit control (if used) open? Is boiler 2.
water temperature above 200 °F?
Is thermostat set below room temperature?3.
Is gas turned on at meter or boiler?4.
Is incoming gas pressure less than 5” w.c. for natural 5.
gas or 4” w.c. for propane?
Are parameters set correctly in this manual?6.
Is the warm weather shutdown activated?7.
If none of the above corrects the problem, refer to 8.
Troubleshooting, beginning on page 99.
 Check system and boiler
 Check water piping
Check system piping for leaks. If found, shut down 9.
boiler and repair immediately. (See WARNING on
page 31 regarding failure to repair leaks.)
Vent any remaining air from system using manual 10.
vents. Air in the system will interfere with circula-
tion and cause heat distribution problems and
noise.
 Check vent piping and air piping
Check for gas-tight seal at every connection and 1.
seam of air piping and vent piping.
Startup — final checks (continued)
Venting system must be sealed gas-tight
to prevent flue gas spillage and carbon
monoxide emissions which will result in
severe personal injury or death.
 Check gas piping
Check around the boiler for gas odor following the 1.
procedure of page 25 of this manual.
If you discover evidence of any gas leak,
shut down the boiler at once. Find the
leak source with bubble test and repair
immediately. Do not start boiler again
until corrected. Failure to comply could
result in severe personal injury, death or
substantial property damage.
 Propane boilers — verify
conversion
Verify propane orifice has been installed per Pro-1.
pane Conversion instructions.
DO NOT adjust or attempt to mea-
sure gas valve outlet pressure. The
gas valve is factory-set for the cor-
rect 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 po-
tential severe personal injury, death
or substantial property damage.
Ultra boilers are shipped ready to
fire natural gas ONLY. Exception:
The Ultra-80LP is factory-equipped
to fire propane. You must install the
propane orifice if the boiler will be
connected to propane. See page 44.
Failure to comply could result in
severe personal injury, death or
substantial property damage.