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 is no requirement to allow
a hot water loading factor in designing the
primary system.
Diagram 12
Primary Connections
Primary Flow
Isolating Valve
Primary Return
Isolating Valve
Filling Loop
Isolating Valve
(Primary Side)
18 Installation & Servicing Instructions
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
pressurized the flexible hose of the filling
loop should be disconnected from the
primary circuit.
Filling Loop
Isolating Valve
(Cold Water Side)
Filling Loop
Flexible
Connection
(Shown fitted
for filling)
Hot Water
Outlet
Connection
Cold Water
Inlet Connection