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MAIN AIR VENT: for down flow systems or diaphragm
type expansion tanks
(not provided)
Before system is filled with water, there is air in pipes and
radiation units. Some air will be trapped as system is filled.
It is possible to eliminate most of this air through air vents
on radiation units. Main air vent will speed and simplify this
process. Install main air vent on highest point in supply
main when all radiation is below top of boiler.
AUTOMATIC FILL VALVE
(not provided)
For safe, efficient operation, hot water system must be
filled with water. Adding new water, when needed can be
done manually (by use of hand valve in water supply line).
This requires regular attention to system’s needs. Auto-
matic fill valve or pressure reducing valve accomplishes this
without attention. Install in supply line on hot water boilers
only. Valve operates through water pressure differentials. It
does not require electrical connection.
BURNER SOLENOID VALVE
(provided)
Beckett and Carlin oil burner’s use standard solenoid valve.
Upon burner shut down, standard solenoid valve stops flow
of oil to nozzle. Without solenoid valve, oil pump continues
to pump oil to burner nozzle until burner motor winds down
below pumps cutoff speed. Riello oil burner has delay sole-
noid valve. Delay solenoid valve provides same shut down
action as standard solenoid valve, plus on burner start
up delay solenoid valve remains closed for additional 15
seconds. Allows burner fan motor to pre-purge combustion
chamber and oil pump to bring supply oil pressure up to its
set point helping to provide clean light off.
LIMIT CONTROL
(provided) Refer to manufacturer
instructions provided with limit control
Water temperature limit control in limit is adjustable and
may be set: as low as 140°F so long as return water tem-
peratures to boiler are no less than 120°F, or as high as
220°F so long as boiler and heating system have adequate
circulation to remove heat from boiler otherwise steam may
be created in boiler. Refer back to “System Piping” section
for more information.
DRAIN VALVE
(provided)
Drain valve is manually operated valve provides means of
draining all water from boiler and heating system. It should be
installed in reducing tee where return line enters boiler.
CIRCULATOR
(provided)
Every forced hot water system requires circulator. Separate
circulator or zone valve is required for each zone, if there
are two or more zones. Circulator must have capacity to
provide circulation required by heating system. Circulator
should be connected to supply main and must be wired into
boiler’s electrical system. See “System Piping” section for
piping configurations with circulator located on supply main
piping using zone circulators or zone valves. When piping
is arranged with zone circulators and no bypass piping,
circulator provided with boiler may be used as zone circu-
lator. Both piping arrangements allow circulator to pump
away from expansion tank and show how piping should be
arranged to allow heating system to be easily purged of air
.
EQUIPMENT AND OPTIONAL ACCESSORIES
Taco 007 Pump Curve