Primary DRAIN
Central Heating DRAIN
DHWS Drain
DRAIN Locations
Ref
Checklist
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Installation
Checked (Initial)
1
Choose appropriate location, Fix wall bracket level and securely.
2
Hang the HIU into position. (Note, check if Stand Off Brackets required)
3
Fit Primary isolation ball valves seal with gaskets provided.
CHECK ALL CONNECTIONS ON THE HIU ARE TIGHT. Some may have loosened
during transport.
4
Connect DISTRICT pipe work. Check isolation valves are closed.
5
Flush District system thoroughly and remove all debris and contaminants. Ensure
the PICV is fully closed by pressing the off button on the controller. Flush through
the built in bypass. After flushing isolate and drain, then remove the filter and
clean before replacing.
6
Note
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The condition of the water in the District Side is required to be cleaned and
chemically protected
-
this is the responsibility of the installer!
7
Secondary connections to the HIU must have isolation valves fitted (as recom-
mended on the accessories page. Filling Loop supplied with the HIU.
8
Ensure provision is made in the heating secondary circuit for an open circuit at all
times, either by an automatic bypass valve or a manual bypass
9
Fit Secondary pipe work, noting carefully the correct system connection points on
the HIU. As shown in Section 4 Stage 6.
10
Connect discharge pipe to the safety valve discharge connection as per Building
Regulations. (pipework to comply with current Building regulations or refer to
BS6798)
11
Ensure all drain valves are closed before opening isolation valves and filling!
See below.
12
Check the position of all the isolating valves, and ready for flushing.
13
Flush and clean all pipe work before connection and filling the HIU
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DO NOT
FLUSH CONTAMINATED OR UNCLEAN WATER THROUGH THE PLATE HEAT
EXCHANGERS. Use an approved cleansing chemical as recommended by the
DWTA, and after cleaning flush away completely. Check the pH value for any
remaining acidity and flush again if acidity is still present *
*full information
SEE SECTION 8
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Zilmet instructions
14
Drain and re
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fill Secondary side and vent all air out of the system. Check all
connections for integrity / leaks.
15
Condition the water in the secondary side using approved chemical inhibitors (as
recommended by the DWTA code of practice for chemical cleaning and treatment
of domestic hot water and central heating systems).
SECTION 4
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Installation and Assembly instructions CHECK LIST
09/17 E & OE
Summary of Contents for Hiper Xi45 INDIRECT HIU 45DHW/10HTG
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