Installation and Operating Instruction

Mounting / Installation
4.2.1 General Instructions for Connection the Heating Unit
● Before connecting the boiler to the heating system, the heating system
must be rinsed at a minimum of 3 times the flow capacity. The drinking
water pipes must be rinsed at a minimum of 20 times its flow capacity.
● In older systems, a filter must be placed in the heating circuit in the return
supply line before the opening to the boiler.
● Use only untreated tap water to fill and refill the heating system.
● The pH value must be between 6 and 9.
● Do not add any chemicals to the heating system’s water (e.g. anti-freeze,
water softener, solutions to raise or lower the pH value, chemical
additives and/or inhibitors). These can damage the boiler.
● When using plastic pipes (e.g. in floor heaters), the pipes must be air
and diffusion tight in accordance with DIN 4726/ 4729.
● If the system’s plastic pipes are not in accordance with the norms, we
recommend separating the boiler circulation system from the heating
system with a (plate) heat exchanger or a filter mounted hydraulically
in front of the boiler connection.
● The temperature of the heating ducts and radiators can go up to 95 °C.
4.2.2 Connecting the Heating Unit (Supply and Return Lines)
There are flue cut-off devices that must be
mounted directly under the boiler. These
should have the respective diameters of the
connections to which they belong. Permanently
soldered or welded connections are not
allowed.
A separate line for filling and draining must be
installed and easily accessible. If the line for
filling and draining is not at the lowest point of
the unit, an additional device must be installed
so the system can be completely drained.
Older systems and floor heating systems require
a filter in the return line directly on the
boiler.
S R A K
V L S V
R L
G
Fig. 13 Connections: BOY III Solo
S R A K
V L W W S V
K W R L
G
Fig. 14 Connections: BOY III Combi
SR Siphon-Cleaning VL Supply WW Warm Water SV Drainage Safety Valve
AK Condensation Drainage RL Return Flow KW Cold Water G Gas Connection
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