Determining The P - Reflex Reflexomat Compact RC Series Operating Manual

7.2

Determining the P

The "P " minimum operating pressure is determined by the location of the pressure maintaining device. The controller calculates the
0
switching points for the "PV" solenoid valve and the "CO" compressor from the "P
Actuating pressure for the "P
Solenoid valve "OPEN" = final pressure "P
Solenoid valve "CLOSED" / Compressor "OFF"
Compressor "ON" = initial pressure "P
The "P " minimum operating pressure is calculated as follows:
0
P = P + P + 0.2 bar*
0 st D
P = h /10
st st
P = 0.0 bar
D
P = 0.5 bar
D
*Addition of 0.2 bar recommended, no addition in extreme cases
Calculation example for "P " minimum operating pressure:
0
Heating system: Static height 18 m, run-on temperature 70 °C, safety temperature 100 °C.
Calculation example:
P = P + P + 0.2 bar*
0 st D
P = h /10
st st
P =18 m/10
st
P = 1.8 bar
st
P = 0.0 bar at a safety temperature of 100 °C
D
P = 1.8 bar + 0 bar + 0.2 bar
0
P = 2.0 bar
0
Notice!
Avoid dropping below the "P
minimum operating pressure for the controller
0
" safety valve
sv
Minimum operating pressure "P
Static pressure "P
Enter the calculated value in the start routine of the controller, see
chapter 7.3 "Modifying the controller's start routine" on page 34 .
h
for safety temperatures ≤ 100 °C
for safety temperatures = 110 °C
"minimum operating pressure. Vacuum, vaporisation and cavitation are thus excluded.
0
Reflexomat with Basic controller — 20.06.2017 - Rev. C
" minimum operating pressure.
0
"
e
"
a
"
0
"
st
in metres
st
Commissioning
English — 33