gledhill Torrent GreenHeat OV TGH140 Design, Installation & Servicing Instructions page 10

INSTALLATION
Allowance for domestic hot water for sizing the boiler
Allowance for domestic
hot water heating (kW)
Torrent model
Full divert mode
140 0
170 0
210 0
280 0
350 0
450 0
Expansion Vessel Requirements
Safety valve setting 3.0
Vessel charge
0.5
pressure (bar)
Initial system charge
0.5 1.0 1.5 2.0 1.0
pressure (bar)
Total System
Expansion Vessel Volume (litres)
Volume (litres)
25 2.1 3.5 6.5 13.7 2.7
50 4.2 7.0 12.9 27.5 5.4
75 6.3 10.5 19.4 41.3 8.2 14.2
100 8.4 14.0 25.9 55.1 10.9 19.0
125 10.4 17.5 32.4 68.3 13.6 23.7
150 12.5 21.0 38.8 82.6 16.3 28.5
Potential
Minimum Number of Feed and
Expansion of
Thermal Store Expansion Tanks
Water in Store
(16 litre model inc. 10 litre expansion)
(litres)
OV model - 6.6
TGH140
SP model - 6.6
OV model - 7.0
TGH170
SP model - 7.0
OV model - 9.6
TGH210 SP model - 9.5
SOL model - 8.0
OV model - 10.6
TGH250 SP model - 10.1
SOL model - 11.1
OV model - 16.5
TGH350 SP model - 16.3
SOL model - 16.4
TGH450 SOL model - 21
Expansion of all connected open vented systems must be added to the store
expansion when choosing the size of the feed and expansion tank.
The weight of each tank when full is 27kg (not including pipework and valves).
INSTALLATION
Boiler Size
The minimum total boiler power required is the
sum of the power required for space heating
which should be calculated in accordance with
Flow share mode
BS EN 12831 and/or the CIBSE guide and the
2
power required for producing hot water which
3
can be read from the table to the left.
3.5
4.5
6.0
8.0
Expansion Vessel For Sealed Heating System
The table opposite can be used for sizing the
heating system expansion vessel. The water
1.0 1.5
content of the Torrent primary heat exchanger
is listed in specification tables on pages 6
1.5 2.0 1.5 2.0
and 7 and a figure of 4.5 l/kW of installed
radiator capacity can be used for a preliminary
assessment of the water content of the heating
system.
4.7 10.3 3.9 8.3
The expansion vessel requirements shown in
9.5 20.6 7.8 16.5
the table are based on a maximum boiler ow
30.9 11.7 24.8
temperature of 93°C. The expansion vessel
41.2 15.6 33.1
must be suitable to accommodate the change
in volume of water in the heating system when
51.5 19.5 41.3
heated from 10°C to 110°C.
61.8 23.4 49.6
Feed And Expansion Tank For Open Vented
Heating System
The potential expansion of all the thermal stores
in the range is shown in the table opposite,
1 alongside the capacity for expansion, in our
standard F & E tank, which can be supplied as
an optional extra.
1
Expansion for all other open vented systems
1 connected to the store must be added to this
gure. So, as a preliminary assessment of the
water content of the attached open vented
systems, a gure of 4.5 l/kW of radiator output
2
can be used. For example, 20 kW radiator output
would have a system volume of 90 litres, and
potential expansion of this would be 3.6 litres,
2
and 10 kW would be 45 litres total volume and
1.8 litres for expansion.
3
Please refer to page 26 for further information
regarding F&E tanks when using solid fuel input.
Page 18
2 Pump System
Min. 250mm
Max.
height
10m
2 Pump System With Dipped Boiler Flow and Return Pipe
Min. 250mm
Must comply
with boiler
manufacturer
instructions
INSTALLATION
Open vented heating systems
The open vented primary system is lled via the
feed and expansion (F&E) tank tted with the
Torrent OV model and therefore it is important that
the F&E tank is positioned at least 250mm above
the highest point in the system. Please check
the F&E tank is big enough for the whole system
expansion. Also ensure that the height of the
F&E tank is su cient to meet the manufacturer's
requirements for the minimum head required for
the boiler and the system pump(s).
The Torrent OV models can be installed using
both 'Y' Plan and 'S' Plan heating system controls.
These models can also be installed without either
3-port or 2-port valves using a separate central
heating pump as shown in diagrams on this
page. In this case no bypass valve is required
unless TRV's are used on all radiators.
If the ow and return pipes between the boiler
and the Torrent OV thermal store are dipped
as illustrated in the schematic shown opposite,
then the boiler selected must be suitable for a
sealed heating system i.e. it must be tted with
an overheat thermostat. Automatic air vents
should be tted at appropriate places to vent
the system and a pressure relief valve should
also be tted close to the boiler.
Any boiler can be used with the Torrent OV and
the Torrent SOL provided the ow pipe from the
boiler to the Torrent is continuously rising. The
ow pipe between the boiler and the Torrent
thermal store is part of the open vent and
therefore it must not be tted with any isolating
valve, non-return valve or any other component
which can obstruct the ow.
The minimum size of flow and return pipe
between the boiler and the Torrent should be
22mm copper or equivalent. In any case it should
be sized to suit the installed boiler capacity,
available pump head and the circuit resistance.
The water level must be set correctly by adjusting
the ball valve in the F&E tank. The over ow/
warning pipe, should be no less than the 20mm
internal diameter and have a continuous fall.
The over ow/warning pipe should be tted to
discharge clear of the building and be sited so
that any over ow can be easily observed. The
warning pipe should be installed in either high
temperature uPVC or copper and should not
have any other connections to it.
If the boiler does not incorporate an overheat
thermostat, then one should be tted to the store.
TORRENT GREENHEAT OV
Page 19