12563
Unvented hot water
storage cylinders
SS 115-SS 150-SS 175-SS 200
SS 250-SS 300
Instructions for Use
Installation and Servicing
www.glow-worm.co.uk
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.
Benchmark places responsibilities on both manufacturers and installers. The purpose is to ensure that customers are
provided with the correct equipment for their needs, that it is installed, commissioned and serviced in accordance with
the manufacturer’s instructions by competent persons and that it meets the requirements of the appropriate Building
Regulations. The Benchmark Checklist can be used to demonstrate compliance with Building Regulations and should
be provided to the customer for future reference.
Installers are required to carry out installation, commissioning and servicing work in accordance with the Benchmark
Code of Practice which is available from the Heating and Hotwater Industry Council who manage and promote the
Scheme.
Visit www.central heating.co.uk for more information.
2
Contents
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.
CONTENTS DESCRIPTION SECTION PAGE
Testing and Certication 4
Design Description 4
Technical Data 1 5
Instructions for Use 2 6
Note to Installer 3 8
Installation 4 8
Commissioning 5 15
Maintenance 6 15
Fault Finding 7 16
INTRODUCTION
INSTALLATION
MAINTENANCE
3
NOTE: Only the correct immersion heater containing a safety
overheat thermostat may be used for replacement.
Applications
The Glow-worm cylinder can be connected to any UK
standard boiler.
Typical applications
Single bathroom property:
Glow-worm cylinder SS 115
Single bathroom property with an en-suite shower room:
Glow-worm cylinder SS 115 / SS 150
Two bathroom property:
Glow-worm cylinder SS 150 / SS 175
Two bathroom property with an en-suite shower room:
Glow-worm cylinder SS 175 / SS 200
Larger properties:
Glow-worm cylinder SS 250 / SS 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 ow
rate. To achieve optimum performance from the Glow-worm
cylinder an adequate cold water mains supply pressure and
ow rate must be available (see section 4.2: Mains Water
pressure).
DHW Temperature Control
The Glow-worm cylinder is supplied tted with an adjustable
domestic hot water (DHW) thermostat with thermal cutout and manual reset button which controls, via a 2 port
motorised valve, the temperature of the water in the Glowworm cylinder.
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.
CH Control
Central heating is controlled by a separate 2 port valve
in conjunction with suitable external controls, such as a
programmer, room thermostat and thermostatic radiator
valves.
Immersion Heater
Glow-worm cylinders are also provided with an auxiliary back
up 3 kW electric immersion heater, including an adjustable
thermostat, thermal cut-out and manual reset button and are
tted behind the front panel.
Testing and Certication
This product has been assessed and complies with the
requirements of the Building Regulations for unvented hot
water storage systems and must not be altered or modied in
any way.
Any alteration not approved by Glow-worm, could invalidate
the certication, 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
IMPORTANT: Use only genuine spare parts supplied by
Glow-worm.
Testing and Certication
Design Description
Assessed and found to comply with
the requirements of the Building
Regulations for unvented hot water
storage systems.
WRAS Approval No.
0501063
4
NOTE: Heat up time based on a primary ow rate of 15 l/min at 82 °C.
Temperature rise is from 15 °C to 65 °C for 70 % of the cylinder volume.
SS 115 SS 150 SS 175 SS 200 SS 250 SS 300 Unit
Size 115 150 175 200 250 300 litres
Nominal DHW ow from
GW 115/150/175/200
GW 250/300
15 l/min @ 60°C
20 l/min @ 60°C
Max. water supply pressure
10 bar
Expn. 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 pres. cold water outlet 22 mm compression
DHW secondary return
G 3/
4
CH ow 22 mm compression (on 2 port valve)
CH return 22 mm compression
Electrical connections:
3 kW Immersion heater
230/240 V. 50 Hz
Two port valve
230/240 V. 50 Hz
Cylinder thermostat
230/240 V. 50 Hz
Coil Specications:
Heat loss
1.7 1.9 2.0 2.1 2.3 2.5 kW/24h
Heatup time
23 25 26 30 38 49 min
Recovery
20 21 23 27 33 44 min
SS 300
SS 250
SS 200
SS 175
SS 150
SS 115
12738
1 Technical Data
5
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 tted 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.
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 ttings.
It is important that your hot water cylinder is serviced annually
by a competent person approved at the time by the Health
and safety Executive. Please contact your installer or Glowworm 01773 828100 for further details.
2.1 Introduction
Your Glow-worm unvented hot water cylinder together with
a boiler, provides you a modern, efcient, 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 benet 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
Glow-worm boiler as well as any other UK standard boiler. All
Glow-worm boilers are equipped with 'built-in' energy saving
technology, such as burner modulation, anti cycling control
and high efciency 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.
Specied use
Glow-worm unvented cylinders are made to full the latest
technical specication and ofcial 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 'specied use' also covers observance of the
operating and installation instructions, along with adherence
to the servicing schedules.
NOTE: The commissioning should be carried out by a
competent person approved at the time by the Health and
Safety Executive and in accordance with the current issue of
BS6798.
The Benchmark documents, for both boiler and cylinder,
should be completed by the installer and/or commissioning
engineer and handed to the user. The Benchmark checklist
and service record are located on the inside back pages of
these instructions.
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 ow 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.
NOTE: Access should always be maintained to allow
operation of the domestic hot water thermostat control.
2 Instructions for Use
6
Diagram 2.1
12528
2.6 Guarantee
Glow-worm 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 scaling, frost damage, 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 Glow-worm cylinder must be installed by a
competent person approved at the time by the Health and
safety Executive 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 Glow-worm cylinder 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 modication will invalidate the warranty.
8. The guarantee card must de completed and returned
to Glow-worm, within 30 days of purchase.
9. The guarantee does not cover the effects of scale.
For all other Glow-worm parts (electrical, thermal controls,
valves and design elements Glow-worm carry a 2 year
guarantee.
2 Instructions for Use
7
4.1 Siting
IMPORTANT. With regards to the Manual Handling
Operations, 1992 Regulations, the following lift operation
exceeds the recommended weight for a one man lift.
Locate the Glow-worm cylinder in the building in the most
convenient position ensuring that:
1. 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 4.4 Discharge pipework).
2. The base chosen for the unit is level and capable of
supporting the weight of the cylinder when full (see section 1
Technical Data).
3. The installation site is frost-free. If necessary provide a frost
protection thermostat.
4. Access is available for user operation of the DHW
temperature control under the front panel.
5. Suitable clearances exist to allow installation, checking and
repressurising of the expansion vessel.
6. The installation site chosen does not result in excessive
”dead leg” distances, particularly to the point of most frequent
use.
7. A suitable cold mains water supply pipe can be provided to
the Glow-worm cylinder direct from the main water stop valve
of the building.
8. The cylinder is factory equipped with adjustable feet to
allow for uneven oor surface.
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 modied in
any way.
The installation must be carried out by a competent person
approved at the time by the Health and Safety Executive
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 Glowworm.
3.1 DHW System
The Glow-worm cylinder is provided with all necessary safety
and control devices for unvented DHW operation.
These are as follows:
A Temperature (95°C) and pressure relief valve (7 bar) factory
tted.
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.
3 Note to Installer
4 Installation
4.2 Mains Water Pressure
The DHW performance of an Glow-worm unvented cylinder
installation will depend on to the available mains water supply
pressure and ow rate. To achieve optimum performance
from the Glow-worm cylinder 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 ow rate at least 20-25 l/min should be
available.
NOTE: Mains water pressure will be reduce 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 ow rate available is 30 l/min,
the available ow rate of mixed water at 40°C will be 25 l/min
(from 15 l/min hot water from the Glow-worm cylinder @ 60 °C
together with 10 l/min cold water @ 10°C).
The Glow-worm cylinder will operate satisfactorily with water
supply pressures below 2 bar although ow rates will be
reduced. If the supply pressure is below 1 bar the Glow-worm
cylinder should not be installed. Contact Glow-worm for details
on alternative hot water supply systems.
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.
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
• Instructions for Use, Installation and Servicing.
Expansion vessel:
• 12 litre for Glow-worm cylinder SS 115/SS 150
• 18 litre for Glow-worm cylinder SS 175/SS 200
• 25 litre for Glow-worm cylinder SS 250/SS 300
• Four compression ttings
Accessory: Mounting bracket No. 0020000000
Prior to installation, ensure that the Glow-worm cylinder is
stored upright in dry conditions.
Please also refer to “General Requirements“ in the installation
instructions supplied with the boiler.
3.2 DHW 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 using an appropriate tting. Using a WRAS approved
circulation pump which incorporates a check valve to prevent
backow (see g. 6). The secondary connection can be made.
8
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