Minimum System Water Pressure; Location; Gas Supply; Service Pipes - Hamworthy Warmwell 60 Installation, Commissioning And Servicing Instructions

3.5 Minimum System Water Pressure

To comply with guidance note PM5 (Health and
Safety Executive),
requirements at the boiler are given below as
examples: -
1) Single installed boiler running at 82°C flow
temperature. Minimum head required is not less
than 2 metres or 0.2 bar.
2) Single installed boiler running at 95°C flow
temperature. Minimum head required = 5.1 metres
or 0.5 bar. See Section 8.10.1 (p12).
3) Modular boiler installation running at 82°C flow
temperature and 11°C rise across system. Minimum
head required = 4.3 metres or 0.42 bar.
4) Modular boiler installation running at 82°C flow
temperature and 20°C rise across system. Minimum
head required = 9.4 metres or 0.92 bar. See
Section 8.11 (p12) for Pressurised Water Systems.

4.0 LOCATION

4.1 See Figure 2.1 (p3) for dimensions/weights and
clearances. The location chosen for the boiler
MUST permit the provision of a satisfactory flue
system and an adequate air supply. The location
must also provide adequate space for servicing and
air circulation around each unit. This includes any
electrical trunking laid along the floor.
Allow adequate space, this must not be less than
460mm at the rear, for flow and return connections.
Also allow at least 460mm on one side, the other
side must be no less than 150mm. Allow 610mm
(minimum) in front of the boiler for servicing.
The boiler must be installed on a level non-
combustible surface that is capable of adequately
supporting its weight (when filled with water) and
any ancillary equipment.
Any combustible material adjacent to the boiler and
the flue system must be so placed or shielded to
ensure that its temperature does not exceed 65°C.
For further details regarding boiler location refer to
BS 6644.

5.0 GAS SUPPLY

5.1 Service Pipes

The local gas region must be consulted at the
installation planning stage in order to establish the
availability of an adequate supply of gas. An existing
service pipe must not be used without prior
consultation with the local gas region.
HAMWORTHY HEATING LTD
the minimum pressure

5.2 Meters

A new gas meter will be connected to the service
pipe by the local gas region, or a local gas region
contractor. An existing meter should be checked,
preferably by the gas region, to ensure that it is
adequate to deal with the rate of gas supply
required.

5.3 Gas Supply Pipes

Supply pipes must be fitted in accordance with BS
6891 or IGE/UP/2 as appropriate. Pipework from the
meter to the boiler must be of adequate size. Do not
use pipes of a smaller size than the boiler gas
connection. The complete installation must be
purged and tested for soundness as described in
BS 6891
appropriate.
See Figure 5.3 (p8) for recommended gas flows in
pipes.

5.4 Boosted Supplies

Where it is necessary to employ a gas pressure
booster, the controls must include a low-pressure
cut-off switch at the booster inlet. The local gas
region must be consulted before a gas pressure
booster is fitted.

5.5 Boiler House Control Valve

A manual valve for boiler house isolation shall be
fitted in the gas supply line. It shall be clearly
identified and readily accessible for operation,
preferably by an exit.

5.6 Boiler Gas System Leak Check

Although the boiler receives a gas leak check and
gas train component integrity check prior to leaving
the factory, transport and installation may cause
disturbance to unions, fittings and gas valve
assemblies' etc. During commissioning a further test
for soundness should be carried out on the boiler
gas pipework and components. A procedure guide
is given below. Care must be taken not to allow leak
detection fluid on or near any electrical parts or
connections (If used). See Figure 5.6 (p9) - Gas
valve/pipework leak check test procedure.
Note: - Main gas supply pressure - G20 - 20mbar
To Check Valve B
1) Turn off the electrical power and gas to the
appliance.
2) Connect the manometer to gas valve test point.
3) With A, B closed open C and monitor manometer
over a 2 minute period, a rise indicates a leak on
valve B.
7
WARMWELL
or IGE/UP/1 and IGE/UP/1A as
- G31 - 37mbar
500001091/F