7.1.6
Overflow valve and manual seals
Install a safety valve in the supply line between the manual seal and the
unit to protect against an unacceptably high pressure Close the overflow
valve with an open connection to the condensate drain.
7.1.7
Expansion vessel
Fit an overflow valve for each boiler in the cascade system. You do not
have to equip each boiler with an expansion vessel, a central expansion
vessel may be used. This must be installed in the return pipe of the sys
tem side. In this case, it must only be possible to shut off the expansion
vessel using special tools (see regulations). When using an indirectly heat
ed calorifier on one or more boilers, this/these boiler(s) must have an addi
tional expansion vessel. This also applies if part of the system is isolated
by means of a heat exchanger.
7.1.8
Configuration and mounting
Select the desired combination of boilers on the basis of the required heat
output. The boilers can be installed next to each other or back to back.
Mount the boilers level on a sufficiently strong wall or mounting frame. We
advise leaving 1 m of free space at the front of the units. The clearance to
the left and right is minimal because all parts can be reached from the
front. A clearance of at least 3 cm between units is recommended to en
sure that the front panel opens easily. We recommend a clearance of at
least 50 cm above the units. To determine the clearance below the boilers,
the dimensions of fittings, connection pipes and low-loss header must be
taken into account.
Warning
The weight of the boiler exceeds the maximum lift weight for
one person. Observe the applicable regulations. We recom
mend the use of a lifting aid. Please ensure all necessary care
is taken when lifting the boiler on to the wall mounting bracket.
7 Appendix
50
MCA
7680446 - v.01 - 14082017
