0020004886A 18.01.05
12563
Unvented hot water
storage cylinders
115-150-175-200-250-300
Glow-worm, Nottingham Road, Belper, Derbyshire. DE56 1JT
www.glow-worm.co.uk
To be left with the user
Instructions for Use
Installation and Servicing
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0020004886A
For customer service call:
01773 828100
Technical helpline: 01773 828300
For General and Sales enquiries:
Tel. 01773 824141
Fax: 01773 820569
To register your Glow-worm appliance call:
0800 073 2142
Guarantee Registration
Thank you for installing a new Glow-worm cylinder in your home.
Glow-worm appliances' are manufactured to the very highest standard so we
are pleased to offer our customers' a Comprehensive Guarantee.
We recommend you complete and return your Guarantee Registration Card as
soon as possible.
If this card is missing you can obtain a copy or record your registration by
telephoning Glow-worm's own service organisation on 01773 828100.
Our Guarantee gives you peace of mind plus valuable protection against
breakdown.
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Contents - Testing and Certification
The instructions consist of three parts, User, Installation and Servicing Instructions.The
instructions are an integral part of the appliance and must, to comply with the current issue of
the Gas Safety (Installation and Use) Regulations, be handed to the user on completion of
the installation.
Testing and Certification
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.
Any alteration not approved by Glow-worm, could
invalidate the certification, warranty and may also infringe
the current issue of the Statutory Requirements.
WARNING: We cannot accept responsibility for any
damage which may occur as a result of non-observance
of these instructions.
Subject to alteration.
Spare Parts REMEMBER: Use only genuine spare
parts supplied by Glow-worm.
CONTENTS
1 Description 4
1.1 DHW Temperature Control 4
1.2 CH Control 4
1.3 Immersion Heater 4
1.4 Applications 4
1.5 Typical applications 4
1a Technical Data 4
2 Instructions for use 6
2.1 Introduction 6
2.2 Liability 6
2.3 How to use your Glow-worm hot water cylinder 6
2.4 Immersion heater 6
2.5 Important notes 6
2.6 Guarantee 7
3 Note To Installer 8
3.1 Secondary System 8
3.2 Secondary Return 8
4 Installation 8
4.1 Installation requirements 8
4.1.1 Siting 8
4.1.2 Mains Water Pressure 8
4.1.3 Pipework – Primary Circuit 9
4.1.4 Discharge Pipework 9
4.1.4.1 High Level Termination 10
4.2 Dimensions 10
4.3 Functional diagrams 11
4.4 Installation procedure 12
4.4.1 Primary pipework 12
4.4.2 Secondary system Pipework 12
4.4.3 Safety valve discharge pipework 12
4.4.4 Drain Valve 13
4.4.5 Electrical connections and controls 13
4.4.5.1 Immersion Heater 13
4.4.5.2 Electrical Connections and Controls 13
4.4.5.3 Control options – system wiring scheme 14
5Commissioning 16
5.1 Filling Secondary DHW Circuit 16
5.2 Filling the Primary Circuit 16
5.3 Operating the Boiler 16
5.4 Benchmark Log Book 16
5.5 User’s Instructions 16
6Maintenance 16
7 Fault finding 17
4
0020004886A
1 Description
NOTE: Only the correct immersion heater containing a safety
overheat thermostat may be used for replacement.
1.4 Applications
The Glow-worm cylinder can be connected to any UK standard
boiler.
1.5 Typical applications
Single bathroom property:
Glow-worm cylinder 115
Single bathroom property with an en-suite shower room:
Glow-worm cylinder 115 / 150
Two bathroom property:
Glow-worm cylinder 150 / 175
Two bathroom property with an en-suite shower room:
Glow-worm cylinder 175 / 200
Larger properties:
Glow-worm cylinder 250 / 300
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.
NOTE 2: Consideration should be given to the use of a larger
size of cylinder than shown above where high water demands
are likely.
The Glow-worm 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.
Glow-worm cylinders are available in six sizes; 115, 150, 175,
200, 250 and 300 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 Glow-worm cylinders operate using a mains water pressure
supply and do not require a feed from a cold water storage tank.
The Glow-worm cylinders have 22 mm DHW outlet and cold
water mains inlet connections for optimum flow rate. To achieve
optimum performance from the Glow-worm cylinder an adequate
cold water mains supply pressure and flow rate must be
available (see section 4.1.2: Mains Water pressure).
1.1 DHW Temperature Control
The Glow-worm cylinder 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
Glow-worm cylinder.
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.
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.
1.3 Immersion Heater
Glow-worm 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.
1a Technical Data
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5 0020004886A
NOTE: Heat up time based on a primary flow rate of 15 l/min at 82°C.
Temperature rise is from 15°C to 65°C for 70% of the cylinder volume.
1a Technical Data
GW 115 GW 150 GW 175 GW 200 GW 250 GW 300 Unit
Size 115 150 175 200 250 300 litres
Nominal DHW flow from
GW 115/150/175/200 15 l/min @ 60°C
GW 250/300 20 l/min @ 60°C
Maximum water supply pressure 10 bar
Maximum primary circuit pressure 2.5 bar
Expansion vessel charge pressure 4 bar
Operating pressure 3.5 bar
Pressure reducing valve 3.5 bar
Expansion relief valve 6.0 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/
4
Primary flow 22 mm compression
(on 2 port valve)
Primary return 22 mm compression
Electrical connections:
3 kW Immersion heater 230/240 V, 50 Hz
Three port valve 230/240 V, 50 Hz
Cylinder thermostat 230/240 V, 50 Hz
Coil Specifications:
Heat loss 1.7 1.9 2.0 2.1 2.3 2.5 kW/24h
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0020004886A
NOTE: Access should always be maintained to allow operation
of the domestic hot water thermostat control.
2.3 How to use your Glow-worm hot water
cylinder
Your boiler and Glow-worm unvented hot water cylinder will
provide both central heating and mains pressure hot water.
Check that the boiler is operational as detailed in the instructions
for use supplied with the boiler.
The domestic hot water thermostat on the Glow-worm cylinder
can be set from 20°C to 65°C. The desired temprature will be set
by the installer while commissioning the Glow-worm cylinder
(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 reheat the cylinder as required.
2.4 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.
2.5 Important Notes
Shutting down the Glow-worm 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
Glow-worm cylinder are kept above freezing point. It must be
remembered however that the boiler will be automatically
switched off by built-in monitoring devices if certain faults occur,
e. g. interruption in the gas or electricity supply.
Alternatively you can drain the central heating system, boiler
and Glow-worm cylinder. Please contact your Installer.
Care and Maintenance
The casing of the Glow-worm 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
Glow-worm 01773 828100 for further details.
2.1 Introduction
Your Glow-worm unvented hot water cylinder and boiler, together
provide you with a modern, efficient, high performance heating
and hot water system.
Because your Glow-worm 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 Glow-worm
cylinder 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 Glow-worm cylinder is tailor made to accompany a Glowworm boiler as well as any other UK standard boiler. All Glowworm 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 heating and hot water system.
2.2 Liability
WARNING: We can accept no liability whatsoever for damage
or injury resulting from failure to observe these instructions.
Specified use
Glow-worm Glow-worm 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.
Use of this type is entirely at the owner's risk.
The term 'specified use' also covers observance of the operating
and installation instructions, along with adherence to the servicing
schedules. The Benchmark logbook, one for both boiler and
cylinder, 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 Benchmark logbook.
You can check your installer by calling CORGI direct on 01256
372300.
NOTE: Your Glow-worm 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 Glow-worm
develops a fault, such as a flow of hot water from the discharge
pipe, switch the boiler and immersion heater off and contact
Glow-worm or your installer.
NOTE: If the Glow-worm cylinder 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.
2 Instructions for Use
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