DTH Electric Boilers USE & CARE MANUAL
(Revision June 2014)
, Page
21.
4.3 STARTUP PROCEDURE
1. Fill the boiler as described in section
4.1.
2. Set the boiler operating temperature as
described in section 4.2.
3. Turn down all heating demands from the
distribution system.
4. Turn on the boiler power breakers and
switch.
5. The main contactors should be activated
in sequence and all elements should
cone in operation. Pilot lights should be
on.
6. Temperature inside the boiler should
increase. Elements and pilot lights
should turn off one by one as they reach
their set point.
7. When all elements are off, establish an
heating demand from the distribution
system.
8. The circulator should start .
9. The elements should turn on in
sequence as the boiler water
temperature drops below the aquastat
set points. This could take many
minutes.
10. The circulator stays on for as long as
there is a demand for heating.
11. When the circulator turns off,
temperature inside the boiler should
increase. Elements and pilot lights
should turn off one by one at they reach
their aquastat set point.
This way, the power drawn by the boiler
depends on the actual heating load of the
building. If you need only one stage to heat your
home, only one will be turned on; if you need
two stages, two will be turned on. Excessive
cycling and wear and tear of electric
components will be avoided, thus increasing
their life reducing heating cost.