General Description; Mode Of Operation - Reflex variomat 1 Assembly, Operating, And Maintenance Instructions

reflex 'variomat'

General description

Mode of operation

General description
'variomat' is a pump-controlled pressure-maintaining station with integrated
functions for degassing and automatic make-up of system water.
Its main application is in closed heating and cooling water circuits.
'variomat' keeps the system pressure within predefined limits to prevent the
formation of a vacuum, evaporation, or cavitation in all system sections. The
unpressurised diaphragm expansion vessel that is closed to the atmosphere
serves for the absorption, storage and delivery of system water. 'variomat'
monitors its function and the corresponding network parameters and documents
the system parameters assigned to it using its controller.
In order to remove air and gas accumulated in the system, 'variomat' has been
equipped with a degassing function. As a result, no air or gas bubbles whatsoever
occur in the system during operation. Noise in heating elements, circulation
problems and so on are avoided in this way. 'variomat' can make-up low system
water in a targeted and controlled way.
Pressure maintenance
If the pressure in the system increases (for example due to heating), the 'variomat'
directs system water through its overflow device(s) into the VG basic vessel(s) or
the VF secondary vessel(s) until the desired system pressure is achieved again.
If the pressure in the system drops (for example due to cooling down, temperature
28 reduction), the pressure-maintaining pump(s) pump water from the expansion
vessel into the system until the desired pressure is achieved again.
p [bar] = Safety valve response pressure at the heat generator
SV
p [bar]
max
p [bar] = Final pressure = overflow device OPEN 0.3 bar
e
p [bar] = Initial pressure pump ON
a
p [bar] = p
0 static
p [bar] = Static pressure (= static height / 10)
st
+ p + 0.2 bar
(recommended)
evaporation
≥ 0.5 bar
0.4 bar
≥ 0.3 bar
0...0.2 bar