Thermsaver unvented water heater Installation Manual
unvented water heater
installation manual
3bar kit version
2
TECHNICAL DATA & INSTALLATION
INSTRUCTIONS FOR DIRECT &
INDIRECT UNVENTED WATER HEATERS
WITH EXTERNAL EXPANSION TANK
Your vessel is made by one of the worlds leading unvented water heater
manufacturers.
Your water heater is made from Duplex Stainless Steel,which is one
of the toughest and best grades of steel currently available.
Each unit has been individually tested and inspected to industry
standard.
Your water heater uses advances in technology and innovative
techniques to provide you with a high performance water heater at
the best price possible.
No other type of water heater can provide all of the benefits that
can be achieved from unvented units such as this model of
Unvented Water Heater.
IMPORTANT NOTICE FOR INSTALLATION
READ THESE INSTALLATION AND MAINTENANCE
INSTRUCTIONS BEFORE COMMENCING
UNVENTED CYLINDERS ARE DESIGNED TO BS STANDARD AND
INSTALLED TO RELEVANT BUILDING REGULATIONS
THE RELEVANT REGULATIONS ARE
ENGLAND & WALES – BUILDING REGULATION G3
SCOTLAND – TECHNICAL STANDARD P3
NORTHERN IRELAND – BUILDING REGULATION P5
AFTER INSTALLATION THE BENCHMARK LOG BOOK MUST BE
COMPLETED AND LEFT ALONG WITH THESE INSTRUCTIONS WITH
THE HOUSEHOLDER FOR FUTURE REFERENCE.
INSTALLATION INSTRUCTION MANUAL
TO BE LEFT WITH THE UNIT
CONTENTS
SPECIFIERS GUIDE
The law and unvented p3
The benefits of unvented systems p3
The benefits of unvented systems p3
Standard energy losses p4
What is supplied with your vessel?p4
INSTALLATION INSTRUCTIONS
Siting the unit
p4
Check water pressure & flow rates p4
Connecting the water supply p5
Cold water valve p5
Drain tap p5
Pipework to taps p5
Secondary circulation p5
Wiring p7
Fitting immersion heaters p7
Fitting the thermal cut out & primary connections p7
Tundish p8
Commissioning the unit p8
External expansion tank p8
Scale p8
Draining p8
Discharge pipework p8
G3 Requirement p9
Problem solving p10
Spares p10
Part component references p10
Guarantee p11
DIAGRAMS
Dimensional data for DH / IDH
range of water heaters p3
Typical installation of a DH tank p5
Typical installation of a IDH tank p5
Secondary circulation connection p6
2 x 2 port (S-plan) valve system p6
2 port valve + 3 port mid position valve (y-plan) p7
Immersion heater p7
Schematic discharge pipe arrangement p8
3
WATER HEATER SPECIFIERS GUIDE
THE BENEFITS OF UNVENTED
WATER HEATERS
● Expansion vessel supplied
● Annual inspection as per warranty
● Duplex Stainless Steel
● Operates at 3bar,which is higher than some other
unvented units
● High quality finish
● Has one of the lowest heat losses for maximum economy
● No sacrificial anode - low maintenance
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Note:
All External Exposed
Pipework is 22mm Diameter
316L Stainless Steel
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Note:
All External Exposed
Pipework is 22mm Diameter
316L Stainless Steel
THE LAW AND UNVENTED
It is legal to fit an Unvented Unit into any property. UK water
byelaws were amended to allow this change.There is no
longer a requirement to have an old-fashioned
“Tank-in-the-Roof” system.
THE BENEFITS OF UNVENTED SYSTEMS
● A real Power Shower without a noisy pump
● No tanks in the roof – no ballcocks to jam or leak – no noise
from tank filling
● All your water – hot and cold – is direct from the mains
● Site the unvented water heater wherever convenient
● Your vessel fills your bath in minutes and will run two at the
same time (subject to good plumbing and flow rates)
● The unit works off electricity (economy 7) or any oil
or gas fired boiler (not suitable for solid fuel boilers)
Dimensional data for Indirect Heat/Direct Heat range of water heaters
Direct Heat Exterior Reference Dimensions
Reference Tank Overall P&T Top Bottom Water
Volumes Height Height Valve Heater Heater In
litres mm mm mm mm mm mm
80 636 694 347 N/A 250 230
130 928 986 618 521 188 230
150 1056 1114 737 640 188 230
175 1213 1271 883 786 188 230
215 1455 1513 1108 1011 188 230
255 1723 1781 1356 1259 188 230
305 1999 2057 1613 1516 188 230
Indirect Heat Exterior Reference Dimensions
Reference Tank Overall P&T Bottom Top Bottom Temp Water Top
Volumes Height Height Valve Heater Coil Coil Monitor In Heater
litres mm mm mm mm mm mm mm mm mm
80 636 681 347 188 N/A 283 233 230 N/A
130 928 973 618 188 558 483 357 230 521
150 1056 1101 737 188 558 483 357 230 640
175 1213 1258 883 188 758 683 458 230 786
215 1455 1500 1108 188 758 683 507 230 1011
255 1723 1768 1356 188 758 683 608 230 1259
305 1999 2044 1613 188 758 683 608 230 1516
4
STANDARD ENERGY LOSSES
The heat loss of each Unvented Unit while
maintaining the temperature of the stored water at 65 degrees
Celsius. (See performance table below).
1) Tests carried out by BBA.Slight variations may occur with
changes to water mains supply pressure
Performance
Nominal Heat up Heat up Reheat Reheat Heat loss in
Capacity Model IDH Model DH Model IDH Model DH 24 hrs
Litres Mins Mins Mins Mins kw/hr
80 33 64 23 53 1.12
130 28 115 21 90 1.50
150 33 138 24 104 1.82
175 27 167 24 124 2.10
215 35 212 30 153 2.64
255 42 263 35 184 2.73
305 50 313 42 220 2.88
SITING THE UNIT
The unit can be placed anywhere convenient. Because it is
connected directly to the mains water supply it is equally efficient
on any floor – ground, first or second. Avoid areas that may be
subject to frost. Try to keep pipe runs as short as possible for
maximum economy,especially hot water discharge pipes running
down from the unit.
The unit can be fitted into a conventional airing cupboard and
does not require any additional insulation.
ALL UNVENTED VESSELS MUST BE STORED VERTICALLY
CHECK WATER PRESSURE & FLOW RATES
We suggest 1.5 bar pressure & 15 litres / minute flow rate to be the
minimum requirements for satisfactory operation. Less than this
the unit will still operate but you will not be able to run two, or
more, outlets at the same time. 85% of all U.K homes have more
than 2-bar pressure.
The mains supply must not exceed 16 bar.If it does a special
pressure-reducing valve will be required.
● 1 Element on IDH indirect models up to 305 litres and 80 litre
DH direct model
● 2 Elements on DH direct models from 130 up to 305 litres.
Additional elements from 215 to 305 litres are available on
request.
● Cold-water control valve comprising line strainer, check valve,
pressure reducing valve set to 3 bar
● Expansion relief valve with non return valve set at 6 bar
● Tundish 15mm x 22mm F x F
● Temperature / Pressure relief valve set at 90 degrees Celsius
and 7 bar pressure relief (factory fitted)
● Motorised valve (indirect units only)
● Cylinder thermostat-factory fitted to cylinder, maximum setting
85 degrees Celsius (indirect units only)
● Thermal cut out set to operate at 87 degrees Celsius plus or
minus 3 degrees (indirect units only)
● Expansion vessel capacity ranges as shown in the table below: -
Tank Size
80 to 130 Litres
150 to 215 Litres
255 to 305 Litres
Expansion Tank Required
12 Litres
18 Litres
25 Litres
2) These figures relate to a 45 degree differential between the
stored water and ambient temperature
WITH YOUR UNVENTED CYLINDER
THE FOLLOWING IS SUPPLIED AS STANDARD
Before commencing installation check that all the components of
your Unit are contained in the kit.
● 3KW Incoloy 825 heating element-incorporating thermostat to
70 degrees Celsius and resetable safety cut out set at 80
degrees Celsius
UNVENTED INSTALLATION INSTRUCTIONS
WARNING : Under no circumstances must the factory fitted temperature pressure relief valve be removed.This will totally invalidate any
guarantee or claim.The cold-water inlet valve assembly must be fitted or the unit will not perform satisfactorily.
DO NOT ATTEMPT TO VENT THE PRIMARY CIRCUIT THROUGH THE UNIT.
All boilers should be installed to manufacturers instructions and the primary circuit through the unit must be pumped.
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