Start The Boiler - Lochinvar WH 55-399 Installation & Operation Manual

10
Start-up
Final checks before starting the boiler
 Read the Knight Wall Mount Service Manual to
familiarize yourself with SMART SYSTEM control
module operation. Read this manual, pages 60 and 61
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 57
and 58 have been completed.
 Ensure float ball is inside condensate trap (see FIG. 10-1).
 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.'s 10-2
and 10-3 on pages 60 and 61.
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?
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.?
If none of the above corrects the problem, refer to the
Troubleshooting Section of the Knight Wall Mount 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 57 and 58 (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.
(continued)
Installation & Operation Manual
 Check vent piping and air piping
1. Check for gas tight seal at every connection, seam of air
piping, and vent piping.
Venting system must be sealed gas tight
WARNING
to prevent flue 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 48 of this manual (connecting gas supply
piping).
If you discover evidence of any gas leak,
WARNING
shut down the boiler at once.
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 or attempt to measure
WARNING
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.
Knight wall mount boilers are typically
WARNING
shipped ready to fire 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 orifice
operate on LP gas, an orifice MUST BE
installed. Failure to comply could result in
severe personal injury, death, or substantial
property damage.
Check flame and combustion
1. Shut off power at source.
2. Remove the flue temperature sensor from the flue pipe
connection. Note: Combustion measurements will be
made at this point.
3. Turn on power at source.
Find the
(see page 13). In order to
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