Variomat Touch — 09.2020 - Rev. A
Optional equipment and accessories
Reflex rapid-action coupling R 1 x 1
Primary vessel connection set
Typical representation of the control unit
Degassing line
• Gas-rich water from the system
• Degassed water to the system
Pressure expansion vessel
If required, install a diaphragm expansion vessel MAG ≥ 35 litres (Reflex N, for
example). It reduces the switching frequency and can be also used in the
individual protection of the heat generators. According to DIN / EN 12828, the
installation of valves between the device and the heat generator is required for
heating systems. Otherwise secure locking mechanisms must be fitted.
"EC" expansion lines
Because of the degassing function, you must install two "EC" expansion lines.
• One line to the system for the gas-rich water.
• One line to the system for the degassed water.
The "DN" nominal connection diameter for the "EC" expansion lines must be
designed for the "P
0
" minimum operating pressure.
Calculation P
0,
see chapter 8.2 "Variomat switching points" on page 15 .
The "DN" nominal connection diameter applies to an expansion line length of up
to 10 m. Beyond this length, select the next larger dimension. Integrate with the
"V" main flow volume of the system. Viewed in the system flow direction, the
gas-rich expansion line must be connected upstream of the expansion line
transporting the degassed water.
Ensure that particulate dirt cannot enter and thus creating an overload of the
"ST" dirt trap. Connect the "EC" expansion lines according to the following
installation variants.
Minimum operating
pressure p
0
(bar)
Note!
The water temperature at the connection point of the "EC" expansion
lines must be in the range of 0 °C to 70 °C. The use of auxiliary
vessels does not increase the range of use. Because the thermal
protection is not ensured due to the flow during the degassing phase.
7.3.4.2 Make-up line
If you don't connect the automatic water make-up, you must close the connection
of the "WC" make-up line with a R ½ " blind plug.
• Prevent a potential device fault by ensuring manual water make-up.
• Install at least one "ST" dirt trap with a mesh size ≤ 0.25 mm close
upstream to the make-up solenoid valve.
– Install a short line between the "ST" dirt trap and the solenoid valve.
Note!
Use a pressure reducer in the "WC" make-up line if the idle pressure
exceeds 6 bar.
Note!
If you use make-up water from the potable water system, you may need
the Reflex Fillset for the "WC" make-up line, see chapter 4.6 "Optional
equipment and accessories" on page 5 .
• Reflex make-up systems such as Reflex Fillset are designed for
make-up lines with a flow rate < 1 m³/h.
7.3.5 Fitting the thermal insulation
Install the optional thermal insulation (2) around the primary tank (1) and close
the insulation with the zip fastener.
Note!
For heating systems, insulate the primary tank and the "EC" expansion
lines against heat loss.
– Thermal insulation is not required for either the primary tank top
or the secondary tank.
Note!
On-site, install thermal insulation when condensate forms.
7.3.6 Fitting the level sensor
Damage to the pressure load cell due to unprofessional installation
Incorrect installation may result in damage to the "LIS" level sensor,
malfunctioning and incorrect measurements from the pressure load cell.
• Comply with the instructions regarding the installation of the pressure
load cell.
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