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T
ORRENT DIRECT AND
T
ORRENT RE SOL
AR
HEATING SYSTEM DESIGN
(b)
The feed and expansion cistern supplied with the thermal store can be fitted remotely up
to 10m above the base of the Torrent i.e. the maximum static pressure in the store must
not exceed 0.6 bar (6.0 mWG).
(c)
The primary pipe work connecting the boiler, thermal store and the central heating system
should be sized to achieve either 11
o
C rise (BS 5449) across the boiler or the maximum
temperature rise specified by the boiler manufacturer; whichever is smaller. But in any
case should not be less than 22mm copper tube or equivalent.
(d)
The pressure loss through the primary heat exchangers of the Torrent Indirect models
(see technical data tables in section 2) should be taken into account for sizing the pump
and the pipe work.
4.4.3 Boiler
Size
The minimum total boiler power required is the sum of the powered required for space heating
which should be calculated in accordance with BS 5449 and the power required for producing hot
water which can be read from table 4.1.
Table 4.1 Allowance for domestic hot water for sizing the boiler
Allowance for domestic hot water heating
Torrent Model
(Both ‘OV’ and ‘SP’ models)
Full divert mode
Flow share mode
T130IND, T130D
0
2
T170IND, T170D, T170RE
0
3
T210IND, T210D, T210RE
0
3.5
T280RE 0
4.5
T350RE 0
6.0
T450RE 0
8.0
4.4.4 Open
vented
heating
systems
(a)
The open vented primary system is filled via the feed and expansion (F&E) cistern
supplied with the Torrent Indirect ‘OV’ model and therefore it is important that the F&E
cistern is positioned at least 250mm above the highest point in the system (see figures
4.2, 4.3 and 4.4).
Also ensure that the height of the F&E cistern is sufficient to meet the manufacturer’s
requirements for the minimum head required for the boiler and the system pump(s).
(b)
The Torrent Indirect ‘OV’ models can be installed using both ‘Y’ Plan and ‘S’ Plan heating
system controls as shown schematically in figures 4.2 and 4.4. These models can also be
installed without either 3-port or 2-port valves using a separate central heating pump as
shown in figure 4.3. In this case no bypass valve is required.
(c)
If the flow and return pipes between the boiler and the Torrent-Indirect-OV thermal store
are dipped as illustrated in figure 4.4, then the boiler selected must be suitable for a
sealed heating system i.e. it must be fitted with an overheat thermostat. Automatic air
vents should be fitted at appropriate places to vent the system and a pressure relief valve
should also be fitted close to the boiler.
(d)
Any boiler can be used with OV variant of the Torrent-Indirect and the Torrent-RE
provided the flow pipe from the boiler to the Torrent is continuously rising as shown in
figures 4.2 and 4.3.
Содержание TORRENT COMBI-PREHEAT
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