11
FALCON
INDUSTRIE
Fig. 9
Central Heating
Detailed recommendations are given in BS6798, BS5449, BS6700 and CP342 Part 2. Pipework not forming part of the
useful heating suface should be insulated to prevent any heat losses or possible freezing (i.e. in roof spaces or ventilated
underfloor spaces). Drain taps should be positioned at the lowest point of the system in accessible locations to permit the
whole system to be drained down. The drain taps should be in accordance with BS2879. Copper tubing to BS2871, Part
1 is recommended for water carrying pipework. Pipework in horizontal runs should have a gradient where possible to
facilitate the removal of air. Ensure that the boiler heat exchanger is not a natural point for air collection. A typical heating
system with domestic hot water circuit is illustrated in fig. 9.
Important
- If thermostatic radiator vales are fitted
a bypass must be fitted to ensure a minimum flow rate through the boiler
of 6 l/min
. The bypass should be fitted as far as possible from the boiler.
Make Up Water
Provision must be made for replacing water lost from the sealed system. Reference should be made to BS6798, for methods
of filling and making up sealed systems. There must be no direct connection between the boiler's central heating system and
the mains water supply. The use of mains water to charge and pressurise the system directly, is conditional upon the Local Water
Byelaws. Again any such connection must be disconnected after use. A typical temporary filling loop is shown in fig. 10.
Domestic Hot Water
Always fit a scale reducer in "hard water areas" (18 clarke degrees or over)". A 15mm copper connection point on the boiler
for attaching to the main supply is provided. The maximum domestic water pressure for the inlet supply is 10 bar (145 P.S.I.).
If the cold mains supply exceeds 5 bar (72 P.S.I.), a water governor or pressure reducing valve must be fitted
by the installer
into the mains supply in an inconspicuous but accessible position preferable between 3 and 5 metres (10-16ft) before the
appliance. Such a valve must be approved by the Water Research Council.
Attention -
is drawn to the Model Water Byelaws.
Fittings manufactured from duplex (alpha-beta) brass are not acceptable for underground use and certain water
undertakings will not accept their use above ground.
Ensure all pipework is adequately supported
Gas
Cold water
Additional expansion
vessel C.H.
(if required)
Filling
point
C.H.
Bypass
NOTE:
A bypass must be fitted as far as possible from the
boiler if thermostatic radiator valves are fitted thoughout.
Key
1.
Filling point C.H.
2.
Temporary connection
3.
Cold water supply
Fig. 10
