LAARS HEATING SYSTEMS
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switch. The boiler will not fire unless the pump is
running and the flow switch is closed.
Field installed safety devices and operating
controllers, such as a valve end switch, draft switches,
relays, timers, and outdoor temperature reset devices,
can be connected to the boiler through the wall
thermostat circuit. Do not exceed a draw of 30VA on
the transformer secondary.
Heat Anticipator: For single zone installations,
the wall thermostat heat anticipator should be set at
1.0 amperes. For multi-zone installations, have a
qualified electrical technician make the necessary
measurements to properly set the thermostats.
1L. Filling the System
It is crucial to the efficient operation of the
system that all air be removed from the circuit. For
this reason, an air scoop and vent should be located
close to the boiler outlet, and there should be a
minimum distance between cold water feed and
system purge valve.
1.
When the system has been completely installed,
close all air vents and open the makeup water
valve. Allow the circuit to fill slowly.
2.
If a make-up water pump is employed, adjust the
pressure to provide a minimum of 12 psi
(82.7kPa) at the highest point in the circuit. If a
Figure 9c. Wiring Diagram, Standing Pilot System (JVT).
Figure 9d. Schematic, Standing Pilot System (JVT).
