Wall Fi Xing; Wall Fi Xing Procedure; Hiu Fi Xing Procedure - Heatrae Sadia HI-MAX INSTANT ID 5-60 Installation, Operation And Maintenance Manual

6.3 Wall fi xing
The Heatrae Sadia HI-MAX INSTANT unit can be
supplied with a fi rst fi x rail for ease of installation. The rail
allows the installer to pipe up and test the pipework to
and from the heat interface unit without the need to have
the heat interface unit on site.
As mentioned in sections 3.6 and 6.2, optional stand-
off kits are available with the Heatrae Sadia HI-MAX
INSTANT to allow the installer to reconfi gure the
connection positions.
The wall fi xing arrangement is the same for all four stand-
off kits.
A safety valve discharge pipe connection is provided in
the 1st fi x rail to allow the installer to carryout all piping
work at the same time.
Figure 24: Mounting details
1
2
3
3
1
2
2
1) M6 studs for HIU fi xing.
2) 7.5mm Dia hole for fi xing the 1st fi x rail to the wall or
the 1st fi x rail to the stand-off channels.
3) Access holes to the stand-off kits wall fi xing holes.

It is important that all fi xing holes (Hole No.2 in
Figure 24) are used as they give support to the valve
rail. Failure to do so could lead to misalignment issues.

Ensure that all access requirements in section
3.5.1 have been met.

The unit is only suitable to be installed in one
orientation, ie. with the community heating system
isolation valves positioned at the top as shown in
Figure 22.
6.4 Wall fi xing procedure
1) Ensure that the access requirements detailed in Fig 11
have been met.
2) Ensure the structure that the HIU will be fi xed to will
sustain the weight of the unit when full of water and with
all its casings on.
3) Position the 1st fi x rail / stand-off kit on the wall
ensuring it is level using a spirit level and mark out the six
fi xing holes.
4) Drill and plug the wall as necessary.
5) Fix the 1st fi x rail / stand-off kit to the wall using
suitable fi xings and check that it is still level using a spirit
level.
The unit is now ready to be plumbed in.
CAUTION
It is important that when piping to and
from the 1st fi x rail / stand-off kit that the
connecting pipes are aligned with the
connections on the 1st fi x rail / stand-off
kit. Failure to do so could lead to damage
1
of the isolation valves.
Once all plumbing work as been carried out the HIU
can be fi tted.
2
6.5 HIU fi xing procedure
1) Slide the four M6 studs on the 1st fi x rail through the
3
slotted holes in the Heatrae Sadia HI-MAX INSTANT
HIU's back plate and secure loosely with the M6 nuts
provided.
CAUTION
3
When fi xing the HIU to the fi rst fi x rail it is
important that you do not over tighten the
nuts on the studs provided.
1
Maximum torque 3Nm.
Use a torque adjustment spanner.
2
2) Insert the fi bre washers supplied between the pipe
connections on the HIU and the isolation valves / safety
2
valve discharge pipe connection on the 1st fi x rail. Lightly
tighten up all of the connection nuts.
3) Make any fi nal adjustments to the HIU position on the
1st fi rst rail / stand-off kit as necessary and tighten up all
four fi xing studs.
4) Gradually tighten up each fl at face joint and fi nish off
by giving each joint a fi nal nip-up.
CAUTION
When connecting the HIU to the 1st fi x
rail / stand-off kit, do not over tighten the
joints.
CAUTION
When piping to and from the 1st fi x rail
/ stand-off kit, take care not to fl ex the
bracketry as this could lead to connection
misalignment issues.
27