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6.1. WHAT IS CASCADE SYSTEM?
Cascade System is creating a heating system by using more
than one boilers together. Cascade heating systems can be used
to heat dwellings, hotels, dormitories, gyms, office and similar
commercial buildings, and provide hot water by creating central
boiler room. It is the most developed system solution as it can
be used with external heat resources such as solar energy.
6.2. IS CASCADE SYSTEM MORE
EXPENSIVE THAN OTHER SYSTEMS?
Materials used in condensing boilers are different than the
materials used in other boilers and there is cost difference due
to their high technological features. Price increases as the boiler
grows. Cascade system eliminates the high cost in big boilers.
Cascade system is composed of more than one appliances
according to the system requirements. All the appliances
operating side by side operate with high modulation range and
according to the need.
Boilers operating in tandem and proportionately may be more
economical than one big boiler in terms of investment cost.
Therefore, using 2 boilers with 50Kw is more economical than a
single boiler with 100Kw. You can use 8 appliances in addition to
cascade system without any control module.
6.3. HOW DOES THE CONDENSING
CASCADE SYSTEM OPERATE?
All appliances in the cascade system operate with proportional
control (modulated). In order to control all boilers at the same
time, Main boiler (master) must be connected to Slave boilers
with socket adapter cables.
When there’s a change in the determined room temperature,
first boiler activates and operates with %100 efficiency. System
watch the boiler’s time of reaching to the wanted temperature.
It compares this time with the previously determined target
time. The system which decides that operating boiler can’t
reach the determined temperature within this period, fulfills the
demand by commissioning a second boiler at the minimum level.
The same process is repeated until the system reaches to the
determined temperature within the target period.
If the operating boiler break down, the other boiler connected in
series activates automatically and there will be no malfunction in
operation order.
The capacity of cascade system is equal to the total capacity of
all boilers. For example; it is possible to create 2.250 kW heating
system by using Warmhaus VIWA 150 kW boilers and controller
unit (Siemens) with 15 boilers. All the boilers connected in series
heats the same heating circuit. It is a must to use balance tank
or plate-exchanger in systems in which cascade system is used.
If you desire, you can create the cascade system which is the
closest to your targeted capacity by combining the boilers
operating in different capacities.
Cascade boilers don’t occupy a place as they are installed on the
wall. Temperature settings of many areas can be adjusted at the
same time thanks to electronic control system. Therefore, your
heating cost will decrease and this advantage make a significant
difference in your bill.
6.4. INSTALLATION SETTINGS OF VIWA
CASCADE SYSTEM:
It is possible to make cascade connection of 8 boilers without
using control unit via motherboards (HDIMS-50) on the
boilers. While making this connection, it is possible to direct by
mounting a RC21.11 control unit to control only the pumps of
determined heating zones. Electricity diagram regarding this is
given in the annex.
While making the connections, pay attention that external
factors such as cable particles or water, moisture don’t contact
with open boards during cabling.
CHAPTER-6
INSTALLATION AND SETTINGS OF CASCADE
SYSTEM
