Glow-worm SS 115, Instructions For Use Manual, Page: 8 / 24

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 floor 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 modified 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 Glow-
worm.
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
fitted.
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 flow 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 flow 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 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 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 flow 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 fittings
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 fitting. Using a WRAS approved
circulation pump which incorporates a check valve to prevent
backflow (see fig. 6). The secondary connection can be made.
8