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H E A T   I N T E R F A C E   U N I T  

D E L I V E R Y   I N F O R M A T I O N  

6. DELIVERY INFORMATION

6.1 Transport

HIU dimensions and weights should be 
considered to allow installation and access in a 
safe manner.

6.2 Packing

HIUs are delivered in cardboard boxes (typical 
cardboard box dimensions are 1030 x 630 x 
350mm and weigh 35kg), packed individually 
and stacked with a maximum of 10 on one pallet 
(Fig. 3). 

Delivery packaging materials are generally made 
up of cardboard, wood and plastics.  

If no agreement has been made regarding the 
return of packaging material, the packaging 
material remains with the customer.

WARNING

The pallet must be transported using approved 

lifting equipment.

The HIU is supplied with all of the components 
shown on the project schematic.

6.3 Storage

The units should be stored horizontally with the 
arrows on the packaging pointing upwards, in a 
dry, frost-free location.

The unit must not be exposed to the elements:     
water drops; humidity; direct sunlight; heat  
sources or high intensity electromagnetic fields.

We recommend covering the HIU to protect it 
from dust, dirt and paint.

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The HIU is designed to be transported 
horizontally with the arrows on the packaging 
pointing upwards. Care must be taken that the 
HIU components and parts in the unit are not 
damaged and that cables and wires are not 
pulled, trapped or damaged during transport.

During delivery of goods, undertake checks 
to determine transit damage and complete 
delivery. If there is damage and missing goods, 
identify to the delivery company and either 
accept conditionally or do not accept delivery. 
Identify the damage on the delivery documents 
and take pictures. Report issue immediately to 
the supplier.

Unforeseen damages found on unpacking the 
goods after delivery should be highlighted as 
soon as possible. Terms and conditions agreed 
to at time of purchase must be followed with 
regards to delivery, complaint periods and 
reporting methods.

CAUTION

Packaging materials must be disposed 
of correctly and recycled. Considering the 
environment and relevant waste disposal 
regulations

Fig. 3

H E A T   I N T E R F A C E   U N I T  

I N S T A L L A T I O N  

7. INSTALLATION

7.1 Location

The HIU must only be installed in a suitable 
location that provides protection against moisture 
and freezing temperatures. The location must 
have sufficient ventilation to prevent heat build up 
within the HIU. 

The location of the HIU should:

 Aim to minimise the length of primary pipework  

    within the occupied space

 Aim to minimise the length of pipework from          

    the pressure relief valve fitted to the secondary     
    heating circuit of the HIU to a suitable drain        
    point (refer to Approved Document G, typical    
    discharge safety valve arrangement)

 Determine pipework configuration from above  

    or below

 Provide sufficient ventilation to the occupied     

    space to prevent excessive heat build-up

 Allow sufficient space around the HIU to  

    permit dismantling of the insulated cabinet for    
    maintenance purposes (Table 5)

7.2 HIU Fixing

 Always use the appropriate tools to install the    

    HIU

INSTALLATION / MAINTENANCE 

CLEARANCES (mm)

Above*

40

Below*

40

In front*

600

Right side*

30

Left side*

30

* Space for pipe work, including insulation must be considered.

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Table 5.

WARNING

Incorrect installation and failure to adhere to these 
instructions can result in damage to the HIU / 
building and serious injury. The installation of the 
HIU must be undertaken by qualified/competent 
persons in-line with legislation. 

 HIU fixings are not supplied with the HIU

 The fixings should be selected based on the    

  substrate being fixed in to and selection of the  
  correct fixing method is the responsibility of the  
  contractor installing the HIU

 If working with walls built using perforated 

bricks    

or blocks or mobile dividing panels 

on any masonry  

 

walls, a preliminary 

static test must be carried out    

to 

determine whether the wall can support the  

 

WARNING

Mechanical impact can cause serious injury 

(crushing).

WARNING

The HIU has sharp edges which may cause injury 
if protective gloves are not worn. Always use 
protective gloves when working on the HIU.

There are three options available for the HIU, which 
consider ease of installation, protection of the HIU 
and pipework routing up and down (all primary and 
secondary connections are on the top of the HIU, 
with safety relief connection at the bottom):

1. 

HIU only option, fixing the HIU directly to the wall.  

    There are three fixing points on the HIU and all  
    should be used to secure the HIU. See

 

Fig 4    

    on the following page, identifying the fixing    
    positions and dimensions of the HIU:

Summary of Contents for vThermt

Page 1: ...Installation Commissioning and Maintenance Manual Version No 002 Always keep the instructions close to the HIU and read the operating instructions carefully before starting any work...

Page 2: ...ydraulic separation between the primary circuit and the secondary DHW and HTG installations The HIU is thermostatically controlled to give good and reliable control of temperature which improves effic...

Page 3: ...g safely and take extreme care DANGER Electrical hazard Failure to follow safety procedures can result in severe injury or death This work may only be performed by a trained electrician CAUTION Risk o...

Page 4: ...ures based on the manufacturer literature DANGER Electricity can cause serious and fatal injuries Always isolate the electrical supply and test before commencing work Before undertaking any work on th...

Page 5: ...nstalled in the outlet of the HTG plate A manometer and thermometer are installed on the heating flow pipework within the HIU This is visible through the front cover of the HIU This gauge displays the...

Page 6: ...AISI 316L Cu Brazing Insulation Expanded Polypropylene Some other materials are used by component manufacturers such as valves and pumps These are in sealing shafts and other small components of the a...

Page 7: ...HIU must only be installed in a suitable location that provides protection against moisture and freezing temperatures The location must have sufficient ventilation to prevent heat build up within the...

Page 8: ...s Step 4 Fit the frame to the wall Step 5 Slide the insulation back onto the valve rail backplate Step 6 Replace all valves Step 7 Fit tighten the nuts and bolts 2 x A and 1 x B so they are secure in...

Page 9: ...alve 8 Heating Heat Exchanger 9 Heating Actuator 10 Heating Control Valve 11 Heat Meter Flow Sensor 12 Pump 13 Junction Box 14 Check Valve 15 Mini Expansion Vessel 16 Expansion Vessel REF COMPONENT 17...

Page 10: ...ion box Before adding power to the unit verify that no electrical connections have been disconnected on the components All accessories and main power supply will be connected in the junction box housi...

Page 11: ...sink tap until a cold clean steady flow of water is achieved Open each DHW outlet within the property until all air and any remaining debris has been flushed through Check HIU for leaking joints on t...

Page 12: ...connections tighten connections as required Do not overtighten the fibre washers as this will result in damage Should a fibre washer become damaged replace the washer immediately ensuring to isolate...

Page 13: ...below which identifies the location of the heating PICV Before undertaking any of the steps below close primary system isolation valves at the top of the HIU and confirm electrical connection is isola...

Page 14: ...or three minutes Complete the Heating section of the Commissioning sheet whilst the HTG is on Switch the HTG off at the room thermostat and isolate the HIU at the fused spur Close the secondary HTG is...

Page 15: ...t be removed after filling Every 2 years Bypass If present check that the flushing bypass valve is closed Every 2 years Pump Check pump setting is Proportional Pressure Auto Adapt Every 2 years HTG Co...

Page 16: ...cted correctly if connected correctly and flow temperature is low consult network operator 10 Plate heat exchanger is blocked Remove PHE clean and re install or replace if necessary FAULT POSSIBLE CAU...

Page 17: ...ted expressly disclaims any liability in relation to the accuracy or completeness of this information Any reliance or use of the information contained within this brochure is at your risk Vital Energi...

Page 18: ...viable sustainable energy solutions for the future For more information about the vTherm t Heat Interface Unit HIU call 01254 296 000 or email hiusales vitalenergi co uk www vitalenergi co uk vTherm...

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