Heating engineer
Installation, use and maintenance manual – K18 Simplygas
21
3
3
HEATING ENGINEER
3.1
WARNINGS
General warnings
Read the warnings in Chapter III.1
p. 4, providing im-
portant information on regulations and on safety.
Compliance with installation standards
Installation must comply with applicable regulations in
force, based on the installation Country and site, in mat-
ters of safety, design, implementation and maintenance
of:
heating systems
cooling systems
gas systems
flue gas exhaust
flue gas condensate discharge
Installation must also comply with the manufacturer's
provisions.
3.2
HYDRAULIC SYSTEM
3.2.1
Primary and secondary heating circuit
The K18 Simplygas appliance can operate in plants with primary
circuit only, or in plants with primary and secondary circuits with
hydraulic separation: in the first case the water pump managed
by the K18 Simplygas unit ensures water circulation also for the
users; in the second case water circulation in heating circuits is
ensured by dedicated water pumps.
With regard to the generation part, the layout must be set up
as shown in Figure 3.1
p. 22 for the K18 Simplygas C1 appli-
ance for space heating only, or as in Figure 3.2
p. 23 for the
K18 Simplygas C1 appliance for heating and DHW production
(with basic DHW functionality). See Figure 3.3
p. 24 for the
K18 Simplygas C1 appliance for heating, DHW production with
advanced DHW functionality and management of one or more
heating circuits.
With regard to the heating distribution circuits, the solutions de-
scribed in Figures 3.4
p. 24, 3.5 p. 25, 3.6 p. 25 are possible.
3.2.2
Constant ot variable water flow
The K18 Simplygas unit may operate with constant or variable
water flow, according to electronic board settings (Paragraph
5.3.4
System and components must be designed and installed
consistently.
3.2.3
Minimum water content
High thermal inertia is conducive to efficient appliance opera-
tion. Very short ON/OFF cycles are to be avoided.
A buffer tank (input on the top and output on the bottom) is not
strictly required but suggested in systems with low water con-
tent in the primary circuit to ensure a minimum load during the
periods of medium to low thermal demand. It is recommended
in systems where the system water flow can be significantly re-
duced, and therefore, in the presence of:
▶
2-way zone valves
▶
thermostatic valves on radiators
▶
heating circuits with several zones
A capacity of 80/100 liters is usually adequate.
