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2
IMPORTANT SAFETY
INFORMATION FOR YOU
Your boiler must be installed, serviced and repaired
by a qualified service technician only. Owner must
not attempt to install, service or repair this boiler.
Should overheating occur or the gas supply fail to
shut off, DO NOT turn off or disconnect the
electrical supply to the pump. Instead, shut off the
gas supply at a location external to the appliance.
DO NOT use this boiler if any part has been
underwater. Immediately call a qualified service
technician to inspect the boiler and to replace any
part of the control system and any gas control
which has been underwater.
DO NOT attempt to add water to boiler or system.
TAKING CARE
OF YOUR BOILER
At least once each month during the heating season,
perform the following inspections:
Check vent tubing: Look for leakage at joints and sagging
of vent tubing runs. If evident, call a qualified service
technician.
Check vent terminal (outside):
Look for and remove any
obstructions (i.e. leaves, shrubs,
snow).
Check water piping: Look for
leaks around boiler and at all
joints. If evident, call a qualified
service technician.
Check system water pressure:
The temperature/pressure gage
indicates the pressure in the boiler
for each water temperature. For
most installations, it should
indicate about 12 psi to 15 psi for
70° to 100° water temperatures
and from 15 psi to 25 psi for
temperatures up to 240°. Ask your
installer or service technician to
explain and show you what
normal pressures to look for.
If pressure decreases from
normal, the system is losing
water; if pressure increases from
An automatic water feed should have been installed
(based on local codes) to maintain proper water
level; ask your installer if this device was installed.
Keep boiler area clear and free from combustible
materials, gasoline and other flammable vapors and
liquids.
DO NOT store anything against the boiler or let
anything accumulate in area surrounding the boiler.
DO NOT allow anything to accumulate around or
block air flow at outside vent terminal (i.e. leaves,
shrubs, snow).
For closet installations, DO NOT allow anything to
block air flow at closet ventilation air openings.
DO NOT use water from heating system for cleaning
or any other use.
DO NOT place clothing on the boiler or venting
system to dry.
normal, the boiler relief valve will open to relieve pressure
(water will be evident on floor below relief valve discharge
piping). In either case, call a qualified service technician.
Check condensate drain and drain trap: Periodic
inspection should be made of this assembly for
deterioration of the tubing and to insure that the trap is
not plugged. If it is plugged or appears to have excessive
sediment in it, it should be removed from the drain
assembly, straightened out to clear the obstruction,
reformed, filled with water and reinstalled as before.
SECONDARY
HIGH LIMIT
RELIEF
(OPTIONAL)
VALVE
AUTOMATIC
AIR VENT
CIRC.
PUMP
WATER PRESSURE/
TEMPERATURE GAGE
24 V TRANSFORMER
ELECTRICAL JUNCTION
BOX
HOT SURFACE IGNITOR
AND FLAME SENSOR
BURNER
ENCLOSURE
PRESSURE SWITCH
LOW SIDE TUBING
GAS
VALVE
WATER
WATER
HIGH
SUPPLY
LIMIT
MANIFOLD
GAS VALVE
BIAS TUBING
CONCEPT 21
ELECTRONIC
BOILER
CONTROL
DIAGNOSTIC
INDICATOR
LIGHTS
AIR FILTER BOX
PRESSURE
SWITCH
PRESSURE SWITCH
HIGH SIDE TUBING
AIR AND GAS
ORIFICE PLATE
COMBUSTION BLOWER
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