Xylem EPR IM Electric heater-circulator unit EPR (obsolete) - Manual (Page 23)

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Instruction manual Laing Electric heater circulator unit
www.lainginc.com
Hydraulic diagram for control process 2
Hydraulic diagram for control process 1
Hydraulic connection of the EPR for domestic hot water heating
As can be seen from the following diagrammatic drawings, the Electric heater-
circulator will be connected in parallel to the boiler and to the heat exchanger
of the hot water heater. To avoid flow through the boiler while heating with
the Electric heater-circulator and vice versa, the boiler as well as the Electric
heater-circulator is connected via a check valve.
Since the heating
system is already
equipped with an
expansion tank, the
Electric heater-circu-
lator does not need a
separate expansion
tank. The pressure
relief valve integrated
into the Electric hea-
ter-circulator serves
as security.
T o s w i t c h
between boiler-hea-
ting and electrical
heating nothing has
to be changed on the
hydraulic installation.
One has only to take
care that instead of
the hot water heater
circulator the Electric
heater-circulator has
to be switched on
as described in the
following chapter.