Apartment Heating Fl Ow And Return Connections; Apartment Heating Safety Valve Discharge Connection; Electrical Connections - Heatrae Sadia HI-MAX INSTANT ID 5-60 Installation, Operation And Maintenance Manual


Note where the hot water system is extensive and
there is a requirement to maintain the hot water
temperature within the pipes, trace heating should be
used.

This unit is not suitable for secondary pumped
circulation type systems.
6.9 Apartment heating fl ow and return
connections

Connections from the Heatrae Sadia HI-MAX INSTANT
to the apartment heating system are located at the
bottom of the unit unless stand-off assemblies A or
D are used. In which case the heating fl ow and return
connections are located at the top of the unit. See
Figure 23 on page 26 for more details.

The Heatrae Sadia HI-MAX INSTANT Indirect units
are suitable to connect to either radiator type heating
systems or underfl oor heating systems.

When installing indirect units with underfl oor heating
it is important that the underfl oor heating system
is capable of mixing the heating fl ow down to the
desired temperatures.
6.10 Apartment heating safety valve discharge
connection

The safety valve discharge has a 15mm pipe connection
which is provided in the fi rst fi x rail on indirect units so
that all plumbing work can be carried out during the
fi rst fi x stage of the installation.

The discharge pipework should have a continuous fall
to a suitable drain and be in a frost free environment.

It is good practice to fi t a tundish to facilitate
commissioning and servicing. A trap should be used
when discharging to drain.

See BS6798 for advice on safety discharge pipework.
WARNING
Although the amount of water discharged
from the safety valve is not likely to be great,
it is important to note that it is likely to be hot
and carry a risk of scalding.
CAUTION
Always check that all connections are
still leak free and that all drain valves are
closed before attempting to fi ll the system.

6.11 Electrical connections


Cable entry into the Heatrae Sadia HI-MAX
INSTANT unit is from the top of the unit through the
cable gland on the top of the fi rst fi x rail.

Ensure all casing screws are fi tted as these
provide earth continuity throughout the casings.

The power supply MUST be earthed. The supply
cable should be 3 core sheathed and must be routed
through the cable grip provided with the outer
sheath of the cable fi rmly secured by tightening
the screws on the cable grip in accordance with BS
EN 7671:2008.
6.11.1 Heating Controls

The Heatrae Sadia HI-MAX INSTANT requires a
programmable room thermostat to control the
apartment heating. The switching cable should
be routed through the cable grommet on the
top of the fi rst fi x rail and secured using the cable
clamp on the back plate of the HIU before being
routed to the Installer terminal box. Refer to the
programmable room thermostat instructions for
more details.
WARNING
Always isolate the power supply before
opening the unit.
Figure 26: Cable routing to the control panel

Ensure the installation is earth bonded in
accordance with BS EN 7671:2008. An earthing stud
is fi tted on the back plate of the HIU, its location is
detailed in Figure 27 below.
Figure 27: Earth stud location

Refer to the wiring diagrams on page 12
and 13 for electrical connections.
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