58
10
Start-up
Final checks before starting the boiler
Read the Knight XL Service Manual to familiarize yourself
with SMART SYSTEM control module operation. Read
this manual, page 59 for proper steps to start boiler.
Verify the boiler and system are full of water and all
system components are correctly set for operation.
Verify the preparation procedures of Section 10, pages 55
through 57 have been completed.
Fill the vent condensate trap with water (removing the
retaining screw in order to remove the 2 inch PVC cap
with the switch located at the top of the trap). Replace
the cap. Press the cap onto the trap until the cap makes
contact with the drain. Replace the retaining screw.
Verify electrical connections are correct and securely
attached.
Inspect vent piping and air piping for signs of deterioration
from corrosion, physical damage or sagging. Verify air
piping and vent piping are intact and correctly installed
per this manual.
Start the boiler
1. Read and follow the Operating instructions in FIG. 10-2,
page 59.
If boiler does not start correctly
1. Check for loose connections, blown fuse or service switch
off ?
2. Is boiler water temperature above 200°F (93°C)?
3. Is thermostat set below room temperature?
4. Is gas turned on at meter or boiler?
5. Is incoming gas pressure less than 4 inches w.c. (.99 kPa)?
If none of the above corrects the problem, refer to the
Troubleshooting Section of the Knight XL Service Manual.
Check system and boiler
Check water piping
1. Check system piping for leaks. If found, shut down the
boiler and repair immediately. (See WARNINGS on
pages 55 through 57 (startup) regarding failure to repair
leaks.)
2. Vent any remaining air from the system using manual
vents. Air in the system will interfere with circulation
and cause heat distribution problems and noise.
Check vent piping and air piping
1. Check for gastight seal at every connection, seam of air
piping, and vent piping.
Venting system must be sealed gastight
to prevent fl ue gas spillage and carbon
monoxide emissions, which will result in
severe personal injury or death.
Check gas piping
1. Check around the boiler for gas odor following the
procedure on page 46 of this manual (connecting gas
supply piping).
If you discover evidence of any gas leak,
shut down the boiler at once. Find the
leak source with a bubble test and repair
immediately. Do not start the boiler again
until corrected. Failure to comply could
result in severe personal injury, death, or
substantial property damage.
Propane boilers – verify conversion
1. Verify propane conversion has been completed per the
Propane Conversion instructions.
DO NOT adjust gas valve outlet pressure.
Th
e gas valve is factory-set for the correct
outlet pressure. Th
is setting is suitable
for natural gas and propane, requiring
no fi eld adjustment. Attempting to
alter the gas valve outlet pressure could
result in damage to the valve, causing
potential severe personal injury, death, or
substantial property damage.
Check fl ame and combustion
1. Turn the main power off to the boiler by placing the
“On/Off ” switch in the OFF position.
2. Remove
the
fl ue temperature sensor from the fl ue pipe
connection.
NOTE:
Combustion measurements will be
made at this point.
3. Turn the main power on to the boiler by placing the “On/
Off ” switch in the ON position.
WARNING
WARNING
WARNING
WARNING
Knight XL boilers are typically shipped
ready to fi re on natural gas. Check boiler
rating plate to determine which fuel the
boiler is set for. If set to natural gas, it may
be converted to LP by installing an orifi ce
or by making a gas valve adjustment (see
pages 13 and 14). In order to operate on
LP gas, an orifi ce MUST BE installed or
a gas valve adjustment MUST BE made.
Failure to comply could result in severe
personal injury, death, or substantial
property damage.
Installation & Operation Manual
