Herz STOCKHOLM, Инструкция, Страница: 3 / 26

HERZ HIU STOCKHOLM
Page 3
Installation Instructions
Pre-installation
Please ensure that drain cocks are fitted to the relevant pipe work prior to the HIU being
fitted to facilitate any necessary filling and draining functions.
NOTE: High differential pressures could cause noise, affect the performance and reduce the
lifetime of some components in the HIU, if it is likely that primary differential pressures could rise
above 55kPa Differential Pressure Control Valves should be installed in the primary circuits to
protect the HIU's. The DPCV (25
– 60 kPa setting range) are fitted as part of the HIU.
The cable entry position should be taken into consideration before installing the HIU, please
refer to the template for the exact position.
Installation
Installing the HIU

Ensure the seals are fitted to the ball valve connections on the ball valves.

Drill the holes for the HIU with a suitable drill.

Using fixings suitable for the type of wall.

Lift the unit up to the wall and locate the HIU onto the screws.

Loosely fit the wall fixings.

Ensure the unit is leveled, fully secure the unit to the wall.

Connect the safety valve vent pipe to a suitable drain using a tundish.
Installing ball valves

If the pipework is already installed, loose fit the ball valves to the relevant pipes before
tightening to the HIU.

Tighten the ball valve connections or fit the respective pipe work to the ball valves and tighten
the compression connections.
Please ensure the ball valves are level before the HIU is fully securing to the wall.
Please note that the unit will be delivered with the cables are disconnected inside the
terminal box, this is to prevent dry running of the pump. The pump should only be
connected once the unit and the secondary heating system have been filled with water.
Electrical
CAUTION:
Risk of electric shock
Isolate the mains electrical supply before starting any work and observe all relevant safety
precautions.
Cable entry
Care must be taken to ensure that cable entries to the HIU are installed in a safe and secure
manner. Cables should not interfere with the top mounting for the HIU cover.
Please read the pump instruction manual before wiring and commissioning and ensure any
safety, venting and operating instructions are followed.
Material note
Pursuant to Article 33 of the REACH Regulation (EC No. 1907/2006), we are obliged to point out
that the material lead is listed on the SVHC list and that all brass components manufactured in our
products exceed 0.1% (w / w) lead (CAS: 7439-92-1 / EINECS: 231-100-4). Since lead is a
component part of an alloy, actual exposure is not possible and therefore no additional information
on safe use is necessary