Vaillant uniSTOR VIH GB SERIES, VIH GB 125 S, VIH GB 155 S, VIH GB 180 S, VIH GB 210 S Instructions For Installation And Use Manual
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Instructions for Installation and Use
uniSTOR
Unvented hot water storage cylinder
VIH GB 125 S
VIH GB 155 S
VIH GB 180 S
VIH GB 210 S
VIH GB 260 S
VIH GB 310 S
GB
Contents
Page
1 Description . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 DHW Temperature Control . . . . . . . . . . . . . . . . . 3
1.2 CH Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Immersion Heater . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.4 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.5 Typical applications . . . . . . . . . . . . . . . . . . . . . . . 3
2 Technical data . . . . . . . . . . . . . . . . . . . . 4
3 Instructions for use . . . . . . . . . . . . . . . . 6
3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2 Liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.3 How to use your uniSTOR hot water cylinder . 6
3.4 Immersion heater . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.5 Important notes . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.6 Guarantee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4 Note To Installers . . . . . . . . . . . . . . . . . . 8
4.1 Secondary System . . . . . . . . . . . . . . . . . . . . . . . . 8
4.2 Secondary Return . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Installation . . . . . . . . . . . . . . . . . . . . . . . 9
5.1 Installation requirements . . . . . . . . . . . . . . . . . . 9
5.1.1 Siting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.1.2 Mains Water Pressure . . . . . . . . . . . . . . . . . . . . . 9
5.1.3 Pipework – Primary Circuit . . . . . . . . . . . . . . . . . 9
5.1.4 Discharge Pipework . . . . . . . . . . . . . . . . . . . . . . . 9
5.1.4.1 High Level Termination . . . . . . . . . . . . . . . . . . . . 10
5.2 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.3 Functional diagrams . . . . . . . . . . . . . . . . . . . . . . . 12
5.4 Installation procedure . . . . . . . . . . . . . . . . . . . . . 14
5.4.1 Primary pipework . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.4.2 Secondary system Pipework . . . . . . . . . . . . . . . 14
5.4.3 Safety valve discharge pipework . . . . . . . . . . . . 15
5.4.4 Drain Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.4.5 Electrical Connections and Controls . . . . . . . . . 16
5.4.5.1 Immersion Heater . . . . . . . . . . . . . . . . . . . . . . . 16
5.4.5.2 Electrical Connections to Cylinder Controls . 16
5.4.5.3 Connection details for control systems
utilising 2 x 2 port motorised valves via
external wiring box . . . . . . . . . . . . . . . . . . . . . . . 17
5.4.5.4 Connection details for connection to
any UK standard boiler . . . . . . . . . . . . . . . . . . . 19
Page
6 Commissioning . . . . . . . . . . . . . . . . . . . . 20
6.1 Filling Secondary DHW Circuit . . . . . . . . . . . . . . 20
6.2 Filling the Primary Circuit . . . . . . . . . . . . . . . . . . 20
6.3 Operating the Boiler . . . . . . . . . . . . . . . . . . . . . . 21
6.3.1 Cylinder Commissioning Checklist . . . . . . . . . . 21
6.4 User’s Instructions . . . . . . . . . . . . . . . . . . . . . . . . 21
7 Maintenance . . . . . . . . . . . . . . . . . . . . . . 21
8 Fault finding . . . . . . . . . . . . . . . . . . . . . . 22
Appendix
Benchmark Cylinder Commissioning
Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
We cannot accept responsibility for any damage
which may occur as a result of non-observance of
these instructions.
Subject to alteration.
uniSTOR GB2
Description 1
1 Description
The uniSTOR range of unvented hot water storage
cylinders are indirectly heated cylinders which are
designed for use with UK standard boilers in hot water
supply systems.
uniSTOR cylinders are available in six sizes; 125, 155, 180,
210, 260 and 310 litre. The cylinders are of stainless
steel construction, insulated with EPS and enclosed in a
decorative casing. They are supplied with all necessary
cold and hot water controls and a 2 port valve for
control of domestic hot water.
The uniSTOR cylinders operate using a mains water
pressure supply and do not require a feed from a cold
water storage tank. The uniSTOR cylinders have 22 mm
DHW outlet and cold water mains inlet connections for
optimum flow rate. To achieve optimum performance
from the uniSTOR an adequate cold water mains supply
pressure and flow rate must be available (see section
5.1.2: Mains Water pressure).
1.1 DHW Temperature Control
The uniSTOR is supplied fitted with a user adjustable
domestic hot water (DHW) thermostat which controls a
2 port motorised valve and hence the temprature of the
water in the uniSTOR.
The external electrical controls should be wired to the 2
port valve and cylinder thermostat in the normal way, as
shown in the section Electrical Connections and
Controls.
1.4 Applications
The Vaillant uniSTOR can be connected to any UK
standard boiler.
1.5 Typical applications
– Single bathroom property:
uniSTOR 125
– Single bathroom property with an en-suite shower
room:
uniSTOR 125 / 155
– Two bathroom property:
uniSTOR 155 / 180
– Two bathroom property with an en-suite shower room:
uniSTOR 180 / 210
– Larger properties:
uniSTOR 260 / 310
Commercial use:
Size depending upon hot water requirements
Note:
1 Select the appropriate boiler to match the
heating load (with the normal allowance for
heating up from cold) plus an allowance for
heating the hot water cylinder. Typically it is
practice to allow an additional 2-3 kW for the
hot water production.
2 Consideration should be given to the use of a
larger size of cylinder than shown above
where high water demands are likely.
1.2 CH Control
Central heating is controlled by a separatly fitted 2 port
valve in conjunction with suitable external controls, such
as a programmer, room thermostat or thermostatic
radiator valves.
1.3 Immersion Heater
uniSTOR cylinders are also provided with an auxiliary
back up 3 kW electric immersion heater, including
operating thermostat and energy cut out.
The immersion heater is fitted behind the front panel.
It is designed for use in unvented installations and
contains a safety overheat thermostat in addition to the
operating thermostat.
For the uniSTOR 260 and 310 an additional second
immersion heater will be available as an accessory.
Note:
Only the correct immersion heater containing a
safety overheat thermostat may be used for
replacement.
uniSTOR GB 3
2 Technical data
2 Technical data
VIH GB 125 S VIH GB 155 S VIH GB 180 S VIH GB 210 S VIH GB 260 S VIH GB 310 S Unit
Size 125 155 180 210 260 310 litres
Maximum water supply pressure 10 bar
Operating pressure 3.5 bar
Pressure reducing valve 3.5 bar
Expansion relief valve 6.0 bar
Expansion vessel charge pressure 4.0 bar
T/P valve 95 / 7.0 °C/bar
Net weight 28 30 33 39 44 49 kg
Weight (full) 145 175 205 245 310 340 kg
Height 969 1179 1339 1499 1789 2109 mm
Cylinder connections:
Cold mains inlet 22 mm compression
DHW outlet 22 mm compression
Balanced pressure cold water outlet 22 mm compression
Secondary return G 3/
Primary flow 22 mm compression
Primary return 22 mm compression
Electrical connections:
3 kW Immersion heater
(according ENBS 60335) 230/240 V, 50 Hz
Length of Immersion heater 430 mm
Two port valve 230/240 V, 50 Hz
Cylinder thermostat 230/240 V, 50 Hz
Coil Specifications:
Heat loss 1.4 1.7 1.8 1.9 2.1 2.4 kW/24h
Heat up time 21 23 24 27 35 47 min
Recovery 18 18.5 19 22 30 42 min
4
Note:
Heat up time based on a primary flow rate of
9 l/min at 80 °C.
Temperature rise is from 15 °C to 65 °C.
uniSTOR GB4
Technical data 2
VIH GB 310 S
VIH GB 260 S
70
VIH GB 210 S
60
VIH GB 180 S
50
VIH GB 155 S
40
VIH GB 125 S
30
Approximate cylinder heat up time 15 °C to 65 °C (minutes)
20
12
Fig. 1 Cylinder heat up times
Cylinder Heat Up Times
60
Reheat time for 70 % of cylinder contents (minutes)
50
40
30
20
10
15 20 25 30 3835
Heat input to cylinder (kW)
uniSTOR GB 5
3 Instructions for use
3 Instructions for use
3.1 Introduction
Your Vaillant uniSTOR unvented hot water cylinder
together with a Vaillant boiler, provides you a modern,
efficient, high performance heating and hot water
system.
Because your uniSTOR hot water cylinder is supplied
with water directly from the mains, you get the benefit
of mains pressure hot water at your hot taps, without
the need for storage tanks in the loft and without a hot
water pump. The uniSTOR is made from high quality
stainless steel within an easy clean casing. The cylinder
is fully insulated using environmental friendly EPS
insulation to help keep your hot water running costs at a
minimum, and protect the environment!
Your uniSTOR cylinder is tailor made to accompany a
Vaillant boiler as well as any other UK standard boiler.
All Vaillant boilers are equipped with 'built-in' energy
saving technology, such as burner modulation, anti
cycling control and high efficiency heat exchangers.
Please read these instructions carefully to ensure that
you get the very best out of your Vaillant heating and
hot water system.
Note!
Your uniSTOR unvented hot water cylinder must
be installed by a competent person in
accordance with current Building Regulations.
Do not remove or adjust any component part of
this cylinder. In the unlikely event that your
uniSTOR develops a fault, such as a flow of hot
water from the discharge pipe, switch the boiler
and immersion heater off and contact Vaillant
Ltd or your installer.
Note!
If the uniSTOR is installed in a cupboard used
for airing purposes please ensure that clothing
or other articles are not placed on the cylinder
or its associated controls.
Note!
Access should always be maintained to allow
operation of the domestic hot water thermostat
control.
3.3 How to use your uniSTOR hot water cylinder
Your boiler and uniSTOR unvented hot water cylinder
will provide both central heating and mains pressure hot
water.
3.2 Liability
Warning!
We can accept no liability whatsoever for damage or
injury resulting from failure to observe these
instructions.
Specified use
Vaillant uniSTOR unvented cylinders are made to fulfil
the latest technical specification and official safety
regulations. These cylinders are designed for use with
UK standard boilers for use in hot water supply systems.
The term 'specified use' also covers observance of the
operating and installation instructions, along with
adherence to the servicing schedules. At the rear of this
manual you will find a Benchmark Cylinder Commissioning
Checklist which should be completed by the installer
and/or commissioning engineer and handed to the user.
All CORGI registered installers carry a CORGI ID card and
have a registration number. Both should be recorded in
your Cylinder Commissioning Checklist. You can check
your installer by calling CORGI direct on 01256 372300.
Check that the boiler is operational as detailed in the
instructions for use supplied with the boiler.
The domestic hot water thermostat on the uniSTOR can
be set from 20 °C to 65 °C. The desired temprature will
be set by the installer while commissioning the uniSTOR
(normally a setting of 60 °C is adequate).
Note!
In hard water areas the DHW temperature
selected should not exceed this setting to avoid
possible scale build-up.
If a programmer has been fitted to control the central
heating and hot water, check that this is set to the
desired on and off periods.
The boiler will then operate automatically to heat the
cylinder contents at the desired times to the
temperature selected. When domestic hot water is used,
the boiler will operate to re-heat the cylinder as
required.
uniSTOR GB6
Instructions for use 3
3.4 Immersion heater
The electric immersion heater behind the front panel is
provided as a back up means of water heating and is not
intended for use at the same time that the boiler is
heating the cylinder.
3
ON/OFF
2
1
3.5 Important notes
Shutting down the uniSTOR cylinder
To shut down the heating and hot water system for
short periods, simply turn off the boiler as shown in the
instructions supplied with the boiler.
Frost protection
Please ensure that if you are absent during a period of
frost the central heating system remains in operation
and the rooms and uniSTOR cylinder are kept above
freezing point.
Alternatively you can drain the central heating system,
boiler and uniSTOR cylinder. Please contact your
Installer.
Care and Maintenance
The casing of the uniSTOR cylinder may be cleaned with
a damp cloth and a little soap. Do not use any abrasive
or solvent material which could damage the case or
fittings.
It is important that your hot water cylinder is serviced
annually by a competent person. Please contact your
installer or Group Service (0870 - 6060777) for further
details.
Fig. 1a
1 Immersion heater
2 Switch (Immersion heater ON/OFF)
3 Additional immersion heater for uniSTOR 260 and 310
(as accessory)
3.6 Guarantee
Vaillant offers a guarantee of 25 years for the stainless
steel vessel against faulty materials or manufacture.
The following information is important as without it your
guarantee may be invalid.
1. The warranty will become invalid if the damage is
due to frost or freezing, transient voltages, lightning
strikes or any act of vandalism or misuse
2. The proof of purchase must be produced in the event
of any warranty claim (bill of sale)
3. The uniSTOR must be installed by a competent
person to the prevailing standards, installation book
and building regulations at the time of installation
4. The Benchmark Cylinder Commissioning Checklist
must be completed on installation and kept up to
date
5. The uniSTOR must be serviced annually
6. The installation must be in an appropriate location
and its use is restricted to potable water (chloride
levels less than 200 mg/l)
7. Tampering or modification will invalidate the
warranty
8. The guarantee card must be completed and returned
to Vaillant Ltd. within 30 days of purchase
9. This guarantee does not cover the effects of scale.
For all other Vaillant parts (electrical, thermal controls,
valves and design elements) Vaillant carry a 2 year
guarantee.
uniSTOR GB 7
4 Note To Installers
4 Note To Installers
This product has been assessed and found to comply
with the requirements of the Building Regulations for
unvented hot water storage systems and must not be
altered or modified in any way.
The installation must be carried out by a competent
person and be in accordance with the relevant
requirements of the Local Authority, Building
Regulations, Building Regulations (Scotland), Building
Regulations (Northern Ireland), and the bye-laws of the
local Water Undertaking. The installation is subject to
Building Regulation approval, notify the Local Authority
of intention to install. In the event of parts replacement,
use only genuine spare parts supplied by Vaillant Ltd.
4.1 Secondary System
The uniSTOR is provided with all necessary safety and
control devices for unvented DHW operation.
These are as follows:
A A prefitted temperature and pressure relief valve
(95 °C, 7 bar).
B A Thermal cut set at 90 °C which when wired to the
2 port valve will isolate the heat source in the event
of failure of the cylinder thermostat.
C A cylinder thermostat (20 °C - 65 °C)
D Expansion relief valve (6.0 bar) incorporating a non
return valve.
E Pressure limiting valve (3.5 bar) incorporating a line
strainer.
Accessory:
- Additional immersion heater 3 kW No. 0020006765
- VR 65 Control Center for new
Vaillant boilers No. 307 215
Prior to installation, ensure that the cylinder is stored
upright in dry conditions.
Please also refer to “General Requirements“ in the
installation instructions supplied with the boiler.
4.2 Secondary Return
A secondary return connection is provided in the water
control pack.
Remove the 3/4 BSP blanking plug from the water
control group. Connect onto the control group using an
appropriate fitting. Using a WRAS approved circulation
pump which incorporates a check valve to prevent
backflow (see fig. 6). The secondary connection can be
made.
Check that the cylinder has been supplied with the
following:
– Packed inside cylinder carton
- Water control pack (pressure reducing valve,
expansion relief valve; connections for: balanced cold
water, secondary return, expansion vessel)
- Motorised 2 port valve
- Tundish
- Cylinder drain valve
- 4 Compression fittings
- Installation and user instructions
- Mounting kit for expansion vessel
- Expansion vessel:
- 12 litre for VIH GB 125/155
(max. storage volume by 3,5 bar = 155 l)
- 18 litre for VIH GB 180/210
(max. storage volume by 3,5 bar = 255 l)
- 25 litre for VIH GB 260/300
(max. storage volume by 3,5 bar = 315 l)
uniSTOR GB8
Installation 5
5 Installation
5.1 Installation requirements
5.1.1 Siting
Locate the uniSTOR in the building in the most
convenient position ensuring that:
– The discharge pipe from the tundish can be installed
with a minimum fall of 1:200 and must be terminated
in a safe and visible position (see section 5.1.4
Discharge pipework).
– The base chosen for the unit is level and capable of
supporting the weight of the cylinder when full
(see section 2: Technical Data).
– The installation site is frost-free. If necessary provide
a frost protection thermostat.
– Access is available for user operation of the DHW
temperature control under the front panel.
– Suitable clearances exist to allow installation, checking
and repressurising of the expansion vessel.
– The installation site chosen does not result in
excessive ”dead leg” distances, particularly to the
point of most frequent use.
– A suitable cold mains water supply pipe can be
provided to the uniSTOR direct from the main water
stop valve of the building.
– The uniSTOR is factory equipped with adjustable feet
to allow unevent floor surfaces.
5.1.2 Mains Water Pressure
The DHW performance of an unvented cylinder
installation will depend on the available mains water
supply pressure and flow rate. To achieve optimum
performance from the uniSTOR a suitable cold mains
water supply must be available, i. e. the measured static
pressure from the incoming mains water supply should
be at least 2.0 bar. A corresponding flow rate at least
20-25 l/min should be available.
Note:
Mains water pressure will be reduced during
periods of peak demand. Ensure that
measurements are taken during these periods.
Example:
If the measured cold mains supply pressure is 2 bar
static and the cold mains flow rate available is 30 l/min,
the available flow rate of mixed water at 40 °C will be
25 l/min (from 15 l/min hot water from the uniSTOR at
60 °C together with 10 l/min cold water at 10°C).
In order to minimise frictional losses minimum 22 mm
bore is recommended for new cold mains supply
pipework into the dwelling although satisfactory
performance can be achieved with 15 mm bore pipework.
5.1.3 Pipework – Primary Circuit
The primary circuit pipework between the Vaillant boiler
and the uniSTOR should be installed using copper tube
of minimum size 22 mm.
If the distance between the boiler and the cylinder is
excessive, a larger pipe diameter may be necessary. It is
not necessary to install a circulating pump in this
pipework because all Vaillant wall mounted boilers
contain a built-in circulating pump (except ecoMAX pro
open-vented boilers).
If the uniSTOR cylinder is used with any other UK
Standard boiler a suitable circulation pump must be
fitted into the primary circuit.
5.1.4 Discharge Pipework
The outlet connections of both the temperature and
pressure relief valve and expansion relief valve should be
connected in 15 mm copper tube to the tundish supplied.
The tundish should be installed vertically, as close to the
uniSTOR as possible and within 500 mm of the
temperature and pressure relief outlet. It must be
positioned away from any electrical components and
installed in the same space as the uniSTOR cylinder, so
that it is visible to the user.
The D1 discharge pipe from the T&P Valve/Expansion
valve can be teed together upstream of the tundish (see
fig 6). The discharge pipework must be installed using
minimum 22 mm copper pipework from the 22 mm
connection on the tundish to a safe and visible discharge
point. There must be a vertical section of pipe at least
300 mm long, below the tundish before any bends or
elbows in the pipework. Increase the diameter of the
pipework if the total resistance of the discharge
pipework exceeds the figures shown in the table below.
The installation of the discharge pipework must be in
accordance with G3 (see fig. 2).
Minimum size Maximum total resistance Resistance created
of discharge allowed expressed as a by each elbow
pipework length of straight pipe or bend
from Tundish (i. e. no elbows or bends)
22 mm up to 9 m 0.8 m
The uniSTOR will operate satisfactorily with water
supply pressures below 2 bar although flow rates will be
reduced. If the supply pressure is below 1 bar the
uniSTOR unvented storage cylinder should not be
installed. Contact Vaillant Ltd. for details on alternative
hot water supply systems.
uniSTOR GB 9
28 mm up to 18 mm 1.0 m
35 mm up to 27 mm 1.4 m
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