Form 2055
5
Revision Date 5/1/2015
Power is shut off to the elements until the modulating motor has driven the sequencer back to its
original starting position. The relay is then activated, and the sequencer will bring the steps back
on one at a time until the system is again balanced. There is also a limit supplied to be installed
with the shunt trip on the main circuit breaker in order to completely shut down all power to the
boiler. Refer to the electric wiring diagram supplied
1 . 6 . 5 S A F E T Y R E L I E F V A L V E S
The safety relief valves are mounted on the top of the boiler. These are a final safety device in
case the operator and other safety devices fail. Such a failure will cause the pressure to rise in the
boiler to the set pressure of the relief valve. The relief valve will discharge, so that the boiler will
not be able to generate pressure beyond the set pressure of the relief valve.
1 . 6 . 6 L O W W A T E R C U T - O F F
The function of the low water cut-off is to shut down the boiler if for any reason the water level
should drop below the normal operating range
1.7 PROCEDURES TO BE FOLLOWED BEFORE PLACING
BOILER IN OPERATION
1 . 7 . 1 H Y D R O S T A T I C T E S T O F B O I L E R S A N D
S Y S T E M
After completing the boiler installation, the boiler connections, fittings, attachments and adjacent
piping must be inspected for leaks by filling the unit with water. The pressure should be gradually
increased to a pressure just below the setting of boiler safety relief valve(s).
Remove the boiler access panels (see dimensional drawing in this manual). Inspect all openings
and fittings for any leaks. Although the boiler is hydrostatically tested at the factory, minor leaks in
fittings and attachments can develop from shipping vibrations or from installation procedures. It is
often necessary to re-tighten such fittings after installation and after the boiler has been in
operation for some time. Replace panels before starting boiler.