Gulfstream GS A-Class 12/OV, Инструкции по проектированию, установке и обслуживанию

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3.3 SPACE HEATING SYSTEM DESIGN
3.3.1 General
(a) All GulfStream
A-CLASS models are available for both the sealed and the open
vented heating systems and this is discussed below in sections 3.3.2 and 3.3.3.
(b) Appliance selection: We recommend that the method for heat loss calculations,
radiator and boiler sizing contained in BS 5449:1990 is used and then compared
to data in table 1.1 for selecting the appropriate model. The allowance for hot
water is built in and therefore no additional hot water allowance should be
added to the calculated requirement for space heating.
(c) Design: The installation must comply with the requirements of BS 6798 and BS
5449. To suit conventional radiator based central heating systems, the appliance
will normally provide flow temperature of 82±2
o C. Therefore normal procedures
for sizing heating circuit network and radiators should be used.
The pump head available for heating circuit is shown in figure 2.3. The appliance
is fitted with an automatic bypass valve, which is factory set to operate at a
differential pressure of 2.4m head. Its characteristics are shown in figure 2.4. The
appliance connection details are shown in figure 2.5.
If the appliance is at the highest point, automatic air vent is provided on the
appliance. However if any point of the heating system is higher than the
appliance, then an automatic air vent must be fitted at the highest point in the
system.
At least one flushing point should be fitted at the lowest point in the system to
enable the system water to be adequately flushed during commissioning.
For low temperature heating systems e.g. under floor heating, the low flow
temperature can be factory set or can be programmed by a Gledhill ATSM.
(d) Frost protection: The appliance has its own built in frost protection which will
prevent the appliance temperature dropping below about 5 o C. However, if it
is necessary, to protect other parts of the system installed in unheated spaces
(e.g. garage, outhouse and ventilated roof space), a frost thermostat(s) must be
fitted and wired as shown in section 4.
(e) User controls: The GulfStream
A-CLASS is supplied with factory fitted and wired
single channel programmer for programming the hot water and space heating
on-off time periods. If required other user controls can be connected to the
appliance as shown in section 4.
An automatic bypass valve is built into the appliance to allow thermostatic
radiator valves (TRV’s) to be fitted. To meet the requirements of Building
Regulations for a boiler interlock it is recommended that the radiator in the area
where the room thermostat is installed should be fitted with lock shield valves
on both connections.
The bypass valve is set at the factory to 2m head but this should be adjusted on
site by the installer to ensure that the temperature rise across the boiler is not
greater than 12
o
C when the boiler is firing at its maximum rating.
(f) Plastic pipework: All the recommendations
with regard to pipework systems in this
manual are generally based on use of
BS/EN Standard copper pipework and
fittings. However plastic pipework can be
used in place of copper internally as long
as it is recommended by the manufacturer
and installed fully in accordance with their
recommendations. We always recommend
the barrier plastic pipework for these
systems.
It is important that if the system is to be
installed using plastic pipework then ensure
that it is designed and sized for plastic
pipework. This is particularly important
in relation to use of push fit connections
when using the optional flexible hose kits.
(See Installation and Wiring section of this
SYSTEM DESIGN