User’s Information Manual
2
Maintenance schedule
8
WARNING
Have leaks fixed at once by a qualified
service technician. Failure to comply could
result in severe personal injury, death, or
substantial property damage.
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.
WARNING
To avoid water damage or scalding due to
valve operation, a metal discharge line
must be connected to the relief valve outlet
and run to a safe place of disposal. This
discharge line must be installed by a
qualified heating installer or service
technician in accordance with the
instructions in the Knight Boiler
Installation and Operation Manual. The
discharge 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 pages 9 and 10 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 pages 9 and 10
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.
Check automatic air vents
1.
Reference FIG. 3 below.
2.
Remove the caps (FIG. 3 – “A”) from the automatic air
vents in the system and check operation by slightly
depressing valve “B” (FIG. 3) with the tip of a
screwdriver.
3.
If the air vent valve appears to be working freely and not
leaking, replace cap “A”, twisting the cap all the way on.
4.
Loosen cap “A” one turn to allow vent to operate.
5.
Have the automatic air vent(s) replaced if it does not
operate correctly.
3.
Replace the front access door.
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 water cutoff
manufacturer’s
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 pages 9 and 10. If gas odor or leak is
detected, immediately shut down the boiler following the
procedures on pages 9 and 10. 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.
Figure 3
Automatic Air Vent
