Primary (Central Heating) Pipework - Heatrae Sadia ELECTROMAX Installation & Servicing Instructions Manual

5.8 Primary (Central Heating) Pipework

Connections to the Electromax primary flow
and return must be in 22mm o/dia. pipe.
Isolating valves are fitted to the Electromax
unit on the primary flow and return connections
to enable the Electromax boiler to be isolated
from the primary circuit for maintenance and
servicing. Connections to the isolating valves
are 22mm compression.
Conventional radiator based central heating
design considerations should be made
in selecting the radiators and circulating
pipework sizes. The maximum output from the
Electromax boiler can be 9kW or 6kW, ensure
the radiator load does not exceed this. NOTE:
The Electromax boiler is dedicated to the
space heating only, the domestic hot water is
heated by separate immersion heaters, so there
Primary Flow
Isolating Valve
Primary Return
Isolating Valve
Filling Loop
Isolating Valve
(Primary Side)
Diagram 12 Primary Connections
is no requirement to allow a hot water loading
factor in designing the primary system.
Use water soluble flux for making soldered
joints and ensure any flux residue is removed
following installation.
A filling loop is provided within the Electromax
casing to fill the primary circuit directly from
the cold water supply. When the system is full
and correctly pressurised the flexible hose of
the filling loop should be disconnected from
the primary circuit.
Filling Loop
Isolating Valve
(Cold Water Side)
Installation & Servicing Instructions
Filling Loop
Flexible
Connection
(Shown fitted
for filling)
Hot Water
Outlet
Connection
Cold Water
Inlet Connection
19