7
Installation
Preparation
• A
safety valve
(max. 6 bar) must be installed in the cold water supply corresponding to stand
-
ards DIN 1988 and 4753, part 1 and TRD 721.
• If the cold water pressure > 6 bar, fit a
diaphragm pressure reducer
max. 6 bar.
• The installation of
flushing equipment
before and after the plate heat exchanger in the primary
and secondary circuits is recommended for descaling or cleaning as necessary.
Special accessories: VMS pre-mixing set
If the tank is operated at a temperature higher than 70 °C a
pre-mixer
that restricts the temperature
to less than 70 °C must be used in the primary circuit.
In order to prevent damage from calcification, the maximum pre-mixing temperature must be 70 °C
with a water hardness of up to 10 °dH, 65 °C with up to 15 °dH and 60 °C at most with a hardness
above 15 °dH.
The
VMS
pre-mixing set is suitable for both FRISTAR models (left pump, right pump).
Figure:
Connection for FRISTAR with
right pump
Technical data
Maximum temperature of pri
-
mary circuit
95°C, short term: 100°C
Setting range
45°C - 65°C
Flow coefficient of mixing valve
4,5m
3
/h
Connections for FRISTAR
¾“
