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Regulations and guidelines

The following regulations and guidelines must 

be observed:
–  Hoval technical information and installation 

instructions

–  Relevant British Standards and Guidelines 

–  Hydraulic and technical control regulations

–  Local Building regulations

Water quality

Heating water:

  European standard BSEN 14868: 2005 

and VDI guideline 2035 must be observed. 

Particular note must be taken of the 

following regulations:

-  Hoval boilers and water heaters are suitable 

for heating systems without significant 

oxygenation (system type 1 in accordance 

below with BSEN 14868: 2005)

-  Systems with 

 - 

Continuous 

oxygenation (e.g. floor 

heating without diffusion-proof plastic 

pipes) or 

 -

  Intermittent 

oxygenation (e.g. frequent 

topping up required) must be fitted with a 

system separator

-  Treated heating water must be checked at 

least once per year or more frequently as 

specified by the inhibitor manufacturer. 

-  If, in the case of existing systems (e.g. 

boiler replacement), the water quality of the 

existing heating water complies with VDI 

2035, it is not recommended that the system 

be refilled. VDI 2035 also applies to top-up 

water.

-  Before filling new systems, or, if applicable, 

existing systems, the heating system must 

be professionally cleaned and flushed. The 

heating system must be flushed before the 

boiler is filled. 

-  Components of the boiler / heat exchanger 

that come into contact with water are made 

of ferrous materials and stainless steel.

-  The combined chloride, nitrate and sulphate 

content of the heating water must not 

exceed a total of 50mg/l.

-  Once the heating has been in operation for 

6 – 12 weeks, the pH value of the heating 

water should be between 8.3 and 9.5.

Water for filling and topping up the system:

-  Untreated drinking water is generally most 

suitable for filling and topping up a system 

with a Hoval boiler. However, the water 

quality of the untreated drinking water must 

always comply with VDI 2035 or must be 

demineralised and/or treated with inhibitors. 

The specifications of BSEN 14868: 2005 

must be observed.

-  In order to maintain the boiler’s high 

efficiency level and to avoid overheating of 

the heating surfaces, the values in the table 

below must not be exceeded. These values 

are calculated in relation to the boiler output 

(the smallest individual boiler in the case 

of multiple boiler systems) and the water 

content of the system.

-  The total quantity of water used to fill and 

top up the system during the boiler’s life 

must not exceed a value equivalent to three 

times the water content of the system.

Heating System

-  The boilers must not be installed in areas 

where halogen compounds occur and could 

enter the combustible air (e.g. washing, 

drying, workshop areas, hairdressing salons 

etc).

-  Halogen compounds can be caused by 

clean ing, degreasing and solvent agents, 

ad hesives and bleaching liquids. 

-  A suitable supply of combustion air must be 

guaranteed. It must not be possible to close 

the air supply apertures. Minimum free area 

for the air supply aperture is 13cm

2

 per 1kW 

boiler output at a flow of 4.2m

3

/hr per 1 kW 

boiler output. 

-  High and low level ventilation should be 

provided (

1

/

3

 high level and 

2

/

3

 low level 

split).

Space requirements

see separate dimensional information on 

pages 9 & 10.

Use of Buffer Vessel

The BioLyt Wood Pellet boiler is designed 

Engineering

to be fully automatic and is supplied with an 

automatic firing or ignition sequence that will 

bring the boiler on from cold without manual 

intervention and has a timed automatic burnout 

once the boiler has satisfied its set point 

temperature returning the boiler to an ‘out’ 

condition. From cold the boiler would typically 

reach its modulating mode after approx 20 

minutes and similarly it takes approx 20 

minutes for the burnout to bring the boiler from 

the modulating mode to out. Once the burnout 

process is initiated it has to take the boiler 

out. It is therefore strongly recommended 

that a load balancing buffer or accumulator 

vessel is included in the primary boiler circuit 

to ensure that any sudden or variable system 

requirements can be met promptly. Please 

contact Hoval Technical Department for advice 

on sizing.

Heating Installation

Low return temperature protection 

A boiler low return temperature protection kit is 

supplied with all BioLyt boilers to ensure that 

the minimum return temperature requirement 

of 45ºC is met. Details of this kit are shown on 

page 12 of this leaflet and also shown on the 

typical hydraulic schematics.

Hydraulic system Design

The boiler hydraulic system design must 

comply with an official Hoval schematic. 

Various examples are included in this leaflet 

and a range of schematics can be downloaded 

from www.hoval.co.uk, or can be supplied on 

request. Please contact Hoval Technical for 

further advice.

Noise Attenuation

The following steps can be taken to reduce 

noise:

-  Make the walls, ceiling and floor of the boiler 

plant room as solid as possible, fit sound 

absorbers in the air supply ducting, provide 

conduit supports and brackets with sound 

dampening fittings.

-  If there are living quarters either above 

or below the boiler plant room, fit rubber 

vibration dampers underneath the base 

channels of the boiler and connect pipework 

with flexible connections.

-  Connect circulating pumps to the system 

with flexible connections.

Expansion vessel / expansion

-  It is recommended that the system 

expansion vessel is connected to the 

heating system with a cold fill loop. This 

means that the entire system will not need to 

be emptied in order to carry out work on the 

vessel.

-  In the case of open vented, the system 

height must be such that the required 

minimum operating pressure is maintained.

Safety valve & automatic air vent

-  A safety valve and automatic air vent must 

be fitted to all boilers.

-  A Hoval safety valve and automatic air vent 

set (c/w pressure gauge) is included with the 

boiler as an accessory. Please see page 11.

Maximum filling quantity based on VDI 2035

Total hardness of filling water up to…

[mol/m3] 1

<0.1

0.5

1

1.5

2

2.5

3

>3.0

f°H

<1

5

10

15

20

25

30

>30

d°H

<0.56

2.8

5.6

8.4

11.2

14.0

16.8

>16.8

e°H

<0.71

3.6

7.1

10.7

14.2

17.8

21.3

>21.3

~mg/l

<10

50.0

100.0

150.0

200.0

250.0

300.0

>300

Conductivity

<20

100.0

200.0

300.0

400.0

500.0

600.0

>600

Boiler size of 

individual boiler

maximum filling quantity without demineralisation

up to 50 kW

  

NO REQUIREMENT

20 l/kW

50 to 200 kW

50 l/kW 20 l/kW 20 l/kW

always demineralise

1 Total of alkaline earths

2 If the conductivity in µS/cm exceeds the value specified in the table a water analysis must be carried 

out
6

Hoval BioLyt (50-160)

Summary of Contents for BioLyt 110

Page 1: ...Hoval BioLyt wood pellet boilers Output from 50 to 160 kW Working pressure to 3 bar Technical Data Output range 50 160 kW BioLyt Wood pellet boiler...

Page 2: ...0 3 0 3 0 3 Boiler waterside resistance at 10 K T mbar 25 55 24 39 52 Boiler waterside resistance at 20 K T mbar 7 16 6 10 13 Water flow at 10 K T m h 4 2 6 4 9 1 11 5 13 5 Water flow at 20 K T m h 2...

Page 3: ...m flow connection R 1 2a Boiler return conection R 1 2b System return connection R 1 3a Pellet feed system transfer box RAS 51 3b Optional RAS 41 pellet transportation 50 mm system centrifugal separat...

Page 4: ...ty heat exchanger connections 2 x R 5 Drain R 1 6 Flue gas outlet External 180 mm 7 Induced draught fan 8 Control panel can be fitted right or left side 9 Sight glass 10 Pocket for boiler sensor Rp be...

Page 5: ...000 840 1000 1750 2000 Dimensions BioLyt 50 160 Boiler without casing and insulation all measurements in mm Pallet included for delivery purposes Assembly and delivery The BioLyt boiler is supplied as...

Page 6: ...separate dimensional information on pages 9 10 Use of Buffer Vessel The BioLyt Wood Pellet boiler is designed Engineering to be fully automatic and is supplied with an automatic firing or ignition se...

Page 7: ...1 0 Moisture Content M 10 Size Diameter D Length D 06 Diameter 6mm 20 30mm Sulphur Content S 0 05 Fines 3 15mm into vehicle F 1 0 Bulk Density 650 kg m3 Hoval do not endorse any particular wood pelle...

Page 8: ...store design is adopted it must be such that it Keeps the fuel dry as water ingress will cause the pellets to fall apart and block handling equipment Is located as close as possible to the boiler Has...

Page 9: ...Typical plantroom layouts General arrangement of a BioLyt and fabric silo pellet storage Fabric silo Fabric silo Flexible auger BioLyt wood pellet boiler Maintenance area 9 Hoval BioLyt 50 160...

Page 10: ...ical plantroom layouts General arrangement of a BioLyt and GRP silo pellet storage GRP Silo Flexible auger BioLyt wood pellet boiler Silo fill pipe Silo vent pipe Maintenance area 10 Hoval BioLyt 50 1...

Page 11: ...ow return temperature protection 3 Consists of Biral shunt pump with cable for connection to boiler control panel motorised 3 way valve ball valve on the return ther mometer above the 3 way valve and...

Page 12: ...nd connectors for vacuum pipes For Hoval BioLyt 50 70 Consisting of auger auger channel auger bearing head piece with drive geared motor and connectors 50 mm for vacuum pipes with integrated fire prot...

Page 13: ...ng circuits and solid fuel buffer vessel installation Function key 4 1 flow sensor 3 immersion sensors 6 loose plugs 6012 157 Key Module 5 For 2 mixing circuits and solar plants Function key 5 1 flow...

Page 14: ...TopTronic 2022 995 Immersion sensor KVT 20 5 6S With 5m cable and plug excludes pocket 6012 687 Surface temperature sensor VF204S Usable as flow or return sensor with 4m cable and plug 6012 688 Flow...

Page 15: ...upply DHW Domestic hot water supply ATS Anti thermal siphon dip to prevent gravity circulation SOP Solar circulation pump KSPF Solar tank sensor calorifier buffer KVLF Solar panel flow sensor PT1000 N...

Page 16: ...Sie dieses Shape S i e h a b e n d i e M gl ichkeit ein neues Shape zu n e h m e n hovhovalhovalhov alhovalhovalhoval hovalhovalhovalh ovalhovalhovalho valhovalhovalhova lhovalhovalhovalh ovalhovalhov...

Page 17: ...val equipment contact our service and spares department Responsibilty for energy and environment One stop shopping With us you can easily incorporate gas oil heat pump solar CHP or biomass energy solu...

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