Filling The Installation - Heatrae Sadia HI-MAX INSTANT ID 5-60 Installation, Operation And Maintenance Manual

6.12 Filling the installation

6.12.1 Filling the DHW system

Check all joints are tight.
 Ensure all drain cocks are CLOSED.

Open a hot tap furthest from the Heatrae Sadia
HI-MAX INSTANT unit.

Open the mains stop cock to fi ll the unit.

Open the cold feed and DHW fl ow isolation valves.
When water fl ows from the tap, allow to run for
a few minutes to thoroughly fl ush through any
residue, dirt or swarf.

close the cold feed and DHW fl ow isolation valves.

Check the cold water fi lter located in the return
hydroblock for any debris and clean as necessary
(see Figure 28).

Open the cold feed and DHW fl ow isolation valves
and purge any air from the system before closing
the hot tap.
CAUTION
Before attempting to remove the cold water
fi lter, ensure that the DHW in the unit is
drained off. This will prevent the formation of
a vacuum when pulling the fi lter cartridge out
of the hydroblock. When doing this, take care
not to break the plastic handle of the cartridge.
Figure 28: Cold water fi lter cartridge location

Once the fi lter has been checked and cleaned as
necessary, open up the cold feed.

Open successive hot taps to purge the system of
air.

Once fl ushed through close all hot taps.
6.12.2 Filling the community heating system

Check all joints for tightness.

Ensure the Heatrae Sadia HI-MAX INSTANT district
heating system drain valve is closed (see Figure 29).
Figure 29: Community heating drain valve

Refer to DIN 4747-1 0 Heating plants for
district heating for guidance.
30

Ensure that the Heatrae Sadia HI-MAX INSTANT
isolation valves on the community heating system
are closed whilst the community heating system is
being fl ushed through. This will prevent any debris
from getting into the HIU. There are two isolation
valves at the top of the unit (See Figure 30).
Figure 30: Community heating isolation valves

Using the community heating fl ushing bypass
arrangement, fl ush out any debris from each
apartment branch.

Once all the debris has been fl ushed out of the
community heating system, close the fl ushing
bypass and open up the community heating fl ow
and return isolation valves on the Heatrae Sadia
HI-MAX INSTANT as detailed in Figure 30.

After a few days of operation check the strainer
is still clear. This is done by isolating and draining
the unit down. Then opening the strainer service
cap and removing the strainer's mesh fi lter and
cleaning as necessary. This should be repeated
over the installation period and before handover.
Figure 31: Community heating system strainer
6.12.3 Filling the apartment heating system

Check all joints are tight.
 Ensure that the drain valves are closed.

Ensure that the cold water supply valve is open.

Check the gas charge in the expansion vessel is
preset to 1 bar g. This should be done without any
water in the vessel.

Using the fi lling loop provided, connect the hose
to the fi lling port on the fl ush and fi ll valve. This is
the upper port on the valve as detailed in Figure
32.
Service cap