IDEAL Concord Super Series 4 50 V, Установка и обслуживание

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12 Concord Super Series 4 -
Installation & Servicing
7. The minimum air requirements by mechanical
ventilation are as follows:
Table 3 - MECHANICAL VENTILATION FLOW RATES
Type of boiler Flow rate per kW total rated
heat input (net)
Inlet air
(Combustion
ventilation)
Extract air
(Ventilation)
Forced / induced
draught boilers
2.6 m
3
/h 1.25m
3
/h
±0.18m
3
/h
A purpose designed flueing ventilation system based solely on
a high level permanent opening to an otherwise sealed boiler-
house or compartment may be used, provided that specialist
advice is taken, and that the combustion air and ventilation
requirements of the boiler is provided in line with BS6644.
In addition to this, the boiler house temperature must be
prevented from exceeding 32ºC at mid-level. BS6644
provides details of temperature requirements.
WATER CIRCULATION SYSTEM
DESIGN REQUIREMENTS
Ideal Concord Super
gas boilers are intended for use
in conjunction with FULLY PUMPED, OPEN VENTED or
PRESSURISED systems - subject to the requirements
detailed below. They are NOT suitable for use on gravity
circulation systems.
Water Flow Rate
1.07 l/s (14.1 gal/min) ± 10% through each module.
Thus a six module boiler requires 6.42 l/s (84.6 gal/min)
volume flow rate. Refer to Tables 1 & 2 for other boilers.
Note. Failure to maintain this flow rate will result in operation
of the module overheat cut off device.
The boilers are suitable for operation when connected to
systems requiring lower flow rates than those quoted above
and to systems where the volume flow varies with load,
PROVIDED they are installed in accordance with Frame 10.
Any other method of installation should be discussed with
Ideal Boilers before proceeding.
HYDRAULIC RESISTANCE - refer to Graph 1
When operating at the correct volume flow rate given above,
the hydraulic resistance of all Ideal Concord Super boilers is
12.5 kN/m
2
(50 in.w.g.).
Pump Over-run
A pump over-run time of 30 seconds minimum must be
allowed for on plant shutdown.
Maximum Static Head
60m (197 ft.), i.e. maximum operating pressure 6.0 bar (85 lb/
in
2
).
Minimum Static Head
Minimum static head requirements for open vented systems
must comply with boiler design characteristics, pump
manufacturer’s requirements and the requirements of the
Health and Safety executive Publication PM5.
In order to comply with the above, a minimum static head
of 2m (6.5 ft), i.e. 0.20 bar (3 lb/in
2
) will be adequate under
most operating conditions, measured either from the highest
circulating point of the system or from they boiler when the
boiler house roof mounted.
Note . In some areas, pump manufacturers will require a
head as high as 12m (40ft). This must be allowed for and the
minimum head increased accordingly. Refer to Frame 10 for
further clarification.
Safety Valve
A safety valve must be sized and fitted in accordance with BS.
6644. The valve should be set at 0.7 bar (10 lb/in
2
) above the
available static head of water over the boiler.
The maximum safety valve setting is 0.7 bar (10 lb/in
2
) above
the maximum design operating head of 6.0 bar (85 lb/in
2
), i.e.
6.7 bar (95 lb/in
2
).
TABLE 4 - VENT, COLD FEED
The open vent and cold feed pipe sizes must comply with BS.
6644 and must be of the following minimum size.
Boiler Cold Feed
nominal dia.
Open Vent
nominal dia.
50 V 19mm 25mm
100 V, 150 V 25mm 32 mm
200 V, 250 V, 300 V, 32 mm 38 mm
150 VA
25 mm 32 mm
250 H, 300 H 32 mm 38 mm
350 V - 600 V 38 mm 50 mm
450 H - 600 H 38 mm 50 mm
Drain
The drain valve must comply with BS.2879 and be operated
with a removable key.
Pressure Gauge
The water pressure gauge and temperature gauge must be
fitted in accordance with BS. 6644.
Water Flow Switch
A water flow switch must be fitted to protect the boiler from
pump failure.
GENERAL