12
The differential pressure regulator keeps the difference in pressure found in two points of
a hydronic circuit at a constant level, corresponding to the set value. The device is inserted
in the circuit return pipe and is connected, by way of a capillary pipe, to the fl ow pipe. It is
used in variable fl ow rate systems, with motorised valves, to limit the increases in differen-
tial pressure that are created when these valves are closed, either totally or partially. The
action of the device is proportionate to the variation in differential pressure that is created,
to restore the
∆
p conditions set.
OPERATION DATA
Maximum pressure
bar
16
Maximum differential pressure
bar
2
Minimum temperature (water)
°C
2
Minimum temperature (water with antifreeze)
°C -20
Maximum temperature
°C 100
Regulation fi eld
kPa 5 - 30
The differential pressure regulator is calibrated and sealed at factory: the value for Sim-
esub HE/DHW 12/40 and Simesub HE/DHW 12/60 is 4; can be adjusted to the desired value
by only qualifi ed SIME technicians with graph in fi g. 3.
Presetting 1,0-7,5
Flow rate [l/h]
Dp [mbar]
Fig. 3
The Energy meter is the device that stores the amount of heat used by the temperature
difference between HMS and HMR and the amount of water used route under its control.
The installation of the heat counters must comply with the normative reference EN
•
1434, parts 1 + 6 , and I.E.E wiring regulations.
This heat counter is manufactured according to the current safety regulations. The
•
maintenance operations must be made by authorized personnel only.
Breakage of any of the seals on the heat counter will invalidate the warranty.
•
A minimum separation of 20 mm must be maintained from any electromagnetic de-
•
vice, and a minimum of 50mm from any other electrical wiring.
The cables to the temperature sensors must not be tightly coiled, lengthened or
•
shortened.
Clean using a dry cloth.
•
When multiple heat counters are installed it is important to observe the wiring polar-
•
ity.
The differential pressure regulator
Energy meter (for code 8111003)
