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Figure 5.6 Gas valve/pipework leak test procedure.
To Check Valve A
1) Open C.
2) Open B to produce the main gas supply pressure
between A and B.
3) Close B
4) System may be considered sound if over a period
of 2 minutes any drop in pressure is less than 0.5
mbar (0.2" wg.).
NOTE: Allow a manometer stabilisation period of
approximately 1-minute before each 2 minute check
period. Following soundness tests close valve B and
remove manometer connections and tighten test
points.
6.0 FLUE SYSTEM
Detailed recommendations for flue systems are
given in BS 6644, I.Gas.E. IGE/UP/10, "Installation
of gas appliances in industrial and commercial
premises Pt 1 flued appliances."
The following notes are intended to give general
guidance only.
6.1 General Requirements
The Hamworthy Warmwell series of boilers are
designed to be used with natural draught flues. Flue
systems should be designed in accordance with
current regulations and with reference to the I.Gas.
E. IGE/UP/10 "Installation of gas appliances in
industrial and commercial premises Pt 1 flued
appliances." The following points should be noted: -
1) Flue gas temperatures from traditional boilers will
be typically 150-200°C which gives buoyancy thus
tending to balance resistances through the boiler
and primary/secondary flueways.
boilers (in condensing mode) have flue gases at/or
approaching water return temperatures.
gases will be in a saturated condition, therefore
HAMWORTHY HEATING LTD
continuous condensation in the flueways must be
expected.
2) The flue system must be self-supporting in the
correct position to enable its removal for boiler
cleaning (condensing heat exchanger only).
3) Boilers should be located as near to the chimney
as possible, the nearest being not more than 2m
(6ft) away.
4) The flue system should be designed to achieve a
negative suction at all times on all modules in a
bank. For optimum performance, draught conditions
should be between -0.05 to -0.125mbar. In some
instances,
necessary. The boilers are suitable for connection
to a fan diluted flue system, refer to I.Gas.E. IGE/
UP/10, "Installation of gas appliances in industrial
and commercial premises Pt 1 flued appliances."
5) Warmwell boilers are suitable for installation in a
balanced compartment in accordance with the
requirements of BS6644.
Heating
assistance if in doubt.
6.2 Design Waste Gas Volume and Temperature
The flue gas temperature will be dependant on the
system return temperature - Figure 2.2 (p4) gives
maximum and minimum temperatures based on
non-condensing and condensing modes. It should
be assumed that there would be no buoyancy aid
from the hot gas leaving the boiler. It is therefore
recommended that the flue resistance should not
exceed 0.25mbar.
It is recommended that the volume and temperature
of the waste gases used for design of the flue
system be as shown in Figure 2.2 (p4).
6.3 Flue Condensation
Care should be taken to ensure the flue is installed
in such a way that condensation produced on start
up or during normal run is piped to an appropriate
drain via the condense trap supplied, discharging
into a tun-dish (not supplied).
The discharge piping from a tun-dish shall slope at
least 30mm/m.
6.4 Materials
Materials used for the flue system must be
mechanically robust, resistant to internal and
external corrosion, non-combustible and durable
under the conditions to which they are likely to be
subjected.
Condense will be produced in normal operation of
Condensing
the Warmwell boiler. The materials used in the flue
construction must be suitable for saturated flue gas
These
and assembled such that condense naturally drains
to traps and does not `leak' from joints.
9
WARMWELL
mechanical
assistance
Consult Hamworthy
Technical
Department
may
be
for
help
or
500001091/F
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