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Gas 220 Ace Cascade Assembly Manual V 18042018
General Information
This technical information contains useful and important details for the proper dimensioning of a
cascade system with floor standing boilers. The description includes the correct use of the complete
Remeha cascade system with Gas 220 Ace modulating floor standing boilers
This manual describes the installation and assembly, of the Gas 220 Ace cascade kits.
In order to make various Gas 220 boilers configurations, Remeha offer several cascade kits. The
compact design of the boilers, combined with the gas and water connection technology of the
cascade system, makes it possible to install a high heat output in a small area.
When installing two to eight Gas 220 Ace boilers, the cascade kits include components that are very
comprehensive and easy to install. The hydraulic and gas system can be put together entirely without
welding, using screw connections, and flanges.
Important
Please contact us if you have any questions or further information about cascade configurations.
Cascade Configuration
In many situations it is advantageous to spread the total required heat output over several boilers.
This can be made possible by means of a "cascade configuration". In a cascade configuration,
heating boilers are connected hydraulically. If the heat demand increases or decreases, boilers are
switched on or off respectively by the external controller
(BMS etc supplied by others).
It is then
important to determine the ideal number of boilers for the cascade. The following factors need to be
taken into account when deciding on the number of boilers:
Reliability:
•
Reliability increases with the number of boilers. Research has shown that reliability is already
optimum for systems with four boilers in a cascade
Arrangement:
•
The compact units and therefore compact configuration means that you have more flexibility
for potential boiler locations.
Adjustment:
•
When using several boilers and modulating control, the heat output offered is virtually equal to
the heat output requested.
Hydraulic isolation: low loss header
Practical experience has shown that it is beneficial to create hydraulic isolation between the boiler
circuit and the system circuit using a low-loss header. This means that a widely varying volume flow
on the system side hardly influences the volume flow on the boiler side at all. This also applies in
reverse: a widely varying volume flow on the boiler side hardly influences the volume flow on the
system side at all. Controlling several different groups hydraulically is therefore significantly easier as
they do not, or barely, influence each other. This creates better overall operating conditions for the
system.
