Test Low Water Cutoff (If Installed); Reset Button (Low Water Cutoff); Check Boiler Piping (Gas And Water); Operate Relief Valve - Lochinvar KNIGHT XL 100 Series User's Information Manual

2
Maintenance schedule

Test low water cutoff (if installed)

1. If the system is equipped with a low water cutoff, test the
low water cutoff periodically during the heating season,
following the low
instructions.

Reset button (low water cutoff)

1. Testing the low water cutoff shuts the unit off. Press the
RESET button on the low water cutoff to turn the unit
back on.

Check boiler piping (gas and water)

1. Remove the boiler front access door and perform a gas
leak inspection per steps 1 through 7 of the Operating
Instructions on page 9. If gas odor or leak is detected,
immediately shut down the boiler following the procedure
on page 9. Call a qualified service technician.
2. Visually inspect for leaks around water piping.
Also inspect the circulators, relief valve, and fittings.
Immediately call a qualified service technician to repair
any leaks.
Have leaks fixed at once by a qualified
⚠WARNING
service technician. Failure to comply could
result in severe personal injury, death, or
substantial property damage.
3. Replace the front access door.
8
water cutoff manufacturer's
User's Information Manual

Operate relief valve

1. Before proceeding, verify that the relief valve outlet has
been piped to a safe place of discharge, avoiding any
possibility of scalding from hot water.
To avoid water damage or scalding due
⚠WARNING
to valve operation, a metal discharge
line must be connected to the relief
valve outlet and run to a safe place of
disposal.
installed by a qualified heating installer or
service technician in accordance with the
instructions in the Knight XL Installation
and Operation Manual.
line must be terminated so as to eliminate
possibility of severe burns or property
damage should the valve discharge.
2. Read the boiler pressure/temperature gauge to make
sure the system is pressurized. Lift the relief valve
top lever slightly, allowing water to relieve through
the valve and discharge piping.
3. If water flows freely, release the lever and allow the valve
to seat. Watch the end of the relief valve discharge pipe
to ensure that the valve does not weep after the line has
had time to drain. If the valve weeps, lift the seat again to
attempt to clean the valve seat. If the valve continues to
weep afterwards, contact your qualified service
technician to inspect the valve and system.
4. If water does not flow from the valve when you lift the
lever completely, the valve or discharge line may be
blocked. Immediately shut down the boiler, following
the operating instructions on page 9 of this manual. Call
your qualified service technician to inspect the boiler and
system.
Shut boiler down (unless boiler is used
for Domestic Water)
1. Follow "To Turn Off Gas to Appliance" on page 9 of this
manual.
2. Do not drain the system unless exposure to freezing
temperatures will occur.
3. Do not drain the system if it is filled with an antifreeze
solution.
4. DO NOT shut down boilers used for domestic water
heating, they must operate year-round.
This discharge line must be
The discharge