Xylem EPR IM Electric heater-circulator unit EPR (obsolete) - Manual (Page 15)

15
Instruction manual Laing Electric heater circulator unit
www.lainginc.com
Pump shut-off
The integrated control is equipped with a pump shut-off option which can be
activated by closing jumper 5.
If the pump shut-off function is not activated, the pump operates always when
the main switch of the control is switched on. If the pump shut-off switch is
activated, the pump only starts when heat is required and runs for about two
more minutes after the heating has been turned off, so that all residual heat
from the heating elements will have been dissipated.
As a general rule, the pump shut-off option should be activated in heating
systems with radiators, while the pump should run continuously in floor heating
applications.
This pump shut-off function is independent from the pump switching of
the pump shut-off module of a zone control, which prevents the pump from
operating when all zone valves are closed. If such a function is desired, a
pump shut-off module is required.
Deactivating heating elements
The Electric heater circulator unit contains three heating elements, which can
be automatically energized by the control. If not all three heating elements are
needed for an application, the second heating element can be deactivated
by opening jumper 6 and heating element 3 can be deactivated by opening
jumper 7. The deactivated heating elements are no longer activated by the
control, unless they are activated by a remote control system.
Remote control of the second and third heating element
This function makes it possible to control the second and third heating ele-
ments, which would mean providing one third or two thirds of the heating
capacity, via an external contact.
It can be used to avoid a high peak load in the electric supply line. The
second and/or the third heating element can, for example, be switched off
when the hot water heater is being reheated or when the oven hot plates are
simultaneously in use. The same applies when the Electric heater circulator
unit is operated in a grid with peak demand usage limitations. In this case,
one third or two thirds of the heat capacity can be switched off at peak load
times.
It should, however, be taken into account that the heating elements – even
when they are switched on via the external contact – are only active when
the control signals a heat requirement or when the control, according to the
chosen program for the switching sequence, activates this heating element.
In case all heating elements should be switched by a remote control, the