Protherm 100EC, User, Installation And Servicing Instructions, Page: 12 / 32

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10
100EC
HEATING SYSTEM DESIGN
The Protherm 100EC is compatible with any type of sealed system installation, i.e. radiators, fan convectors
etc.
Pipe sectional areas shall be determined in accordance with normal practices, using the pump curve, refer to
‘Technical Data’ . The distribution system shall be calculated in accordance with the output requirements of the
actual system, not the maximum output of the boiler. However, provision shall be made to ensure sufficient flow so
that the temperature difference between the flow and return pipes is less than or equal to 20 °C. The minimum flow
is
500 l/h.
The piping system shall be routed so as to avoid any air pockets and facilitate permanent venting of the installation.
Bleed fittings shall be provided at every high point of the system and on all radiators.
The total volume of water permitted for the heating system depends, amongst other things, on the static head in the
cold condition. The expansion vessel on the boiler is pressurised at 1 bar (corresponding to a static head of 10 m
wg.) and allows a maximum system volume of 130 litres for an average temperature of 75 °C and a maximum
service pressure of 3 bar. This pressure setting can be modified at commissioning stage if the static head differs.
Provision shall be made for a drain valve at the lowest point of the system.
Thermostatic radiator valves are permitted, however, not all radiators must be fitted with this type of valve and
particularly where the room thermostat is fitted.
A WRC approved filling loop is supplied with the boiler to enable correct filling of the system.
In all cases, it is ESSENTIAL that the system be thoroughly flushed prior to installing the new boiler.
Domestic hot water system design
Copper tubing or plastic Hep
2
O may be used for the domestic hot water system. Unnecessary pressure losses
should be avoided. The domestic hot water supply pressure must be between 1 and 6 bar. If the pressure exceeds
6 bar, a pressure reducing valve must be fitted. In known hard water areas, it is recommended that a suitable scale
reducing device is fitted to the cold water supply to the boiler.
Diagram 6
Boiler connections
A
Heating flow
B Hot water outlet
C Gas connection
D Cold water mains inlet
E Heating return
F Safety valve discharge connection
Heating system connections
- Pipe diameter 22 mm.
Hot water system connections
- Pipe diameter 15 mm.
Gas connection
- Pipe diameter 22 mm.
Safety valve discharge connection
- Pipe diameter 22 mm.
Note: White colored washers must be used for the hot water system connections.