Gravity Circuit; Heating; Pipe Fittings; Water Circuit Temperature - Stanley Errigal Solid Fuel 47K CookerBoiler & Non Boiler Operating Instructions Manual

heating systems. BS EN 12828: 2003; Heating
Systems in Buildings. Design of water based heating
systems. BS EN 12831: 2003; Heating Systems in
Buildings. Method for calculation of the design heat
load.

GRAVITY CIRCUIT

The gravity circuit consists of a domestic hot water
tank of 135 litres. An indirect cylinder to BS 1566
must be used. A heat leak radiator with a heat out-
put minimum 1kW should also be connected on the
gravity circuit. It should be connected to the boiler
by 28mm diameter flow and return piping. The pipes
should not exceed 7.8m each in length and anything
in excess of 4.6m must be fully lagged. The shorter
the run of pipe work the more effective the water
heating efficiency and to this end, the cylinder
should be fully lagged. In the interest of safety do
not have any valves on this circuit. It is recom-
mended to fit a drain point at the lowest level of the
system and at any point that may not drain if the sys-
tem is emptied.

HEATING

Care should be taken to ensure that the heating
installation is correctly installed and that it complies
with all relevant codes of practice. If this appliance
is being connected to an existing system, it is
strongly recommended to check the following.
(a) That the pipework is adequately insulated
(where applicable).
(b) Check all controls e.g. pump, pipe thermostat
etc, are operating satisfactorily and are compat-
ible with the requirements of the cooker.
(c) Cleanse the system and add suitable inhibitor.
Only competent personnel should be employed to
carry out your heating installation.

PIPE FITTINGS

Materials used for installation work should be fire
resistant, sound and should conform to the current
editions of the following or their equivalent:
1. Ferrous Materials
B.S. 1387: Steel tubes
B.S. 1740: Steel pipe fittings
B.S. 5295 & jointing materials
2. Non-ferrous materials
I.S. 238: Copper tubes
B.S. 4127: Stainless steel tubes
EN 29453:Solder
I.S. 239: Compression tube fittings
B.S. 1552: Manual shut-off valves

WATER CIRCUIT TEMPERATURE

The return water temperature must be maintained at
not less than 50º C so as to avoid condensation on
the boiler and return piping. Fitting a pipe thermo-
stat to the return from the gravity circuit and wiring it
into the pump control will ensure than no cold water
will be returned from the central heating circuit
before the water from the gravity circuit has warmed
up the common return pipe and boiler. If this is not
sufficient to keep the boiler temperatures above the
required minimum, a three-way mixing valve may be
fitted to the flow pipe to divert some hot water
straight back into the return. Such a valve can be
operated either manually or electrically in conjunc-
tion with a return pipe thermostat.
In some circumstances it may be possible to over-
heat the appliance and the water inside will boil. This
will be evident by the sound of a knocking noise
coming from the appliance and pipes around the
house. If this occurs close off all air controls and
manually start the central heating pump if fitted.
One radiator on the heating circuit should be uncon-
trolled to act as a heat leak in the event that the
appliance overheats and has nowhere to discharge
a build up of hot water should the heating circuit be
satisfied. Be aware that steam and boiling water will
be expended from any open vent from the heating
system probably in the roof space at the expansion
tank.
In the unlikely event that the appliance is not oper-
ating in freezing conditions the water must be
drained from the boiler to prevent frost damage.
Fig.12
COMMISSIONING & HANDOVER
Ensure all parts are fitted in accordance with the
instructions.
On completion of the installation allow a suitable
period of time for any fire cement and mortar to dry
out, before lighting the stove. Once the stove in
under fire check all seals for soundness and that the
boiler and water system are operating correctly.
11