INSTALLATION INSTRUCTIONS
ADD IN BOILERS
Acorn 4 & 5 multifuel stoves offer the option of a slab boiler, which occupies the position of the rear firebox liner panels.
Fitting:
•Remove the fuel retainers, rear firebox liner panels and throat plate.
•Knock out the blanking discs in the back plate corresponding to the terminals on the boiler.
•Introduce the boiler to the appliance through the main fire door and locate the terminal pipes through the back plate holes and seal around boiler terminals with fire cement.
•Engage locking nuts to the thread of the terminals and tighten to secure the boiler in position, ready for connection to flow and return pipes.
•Replace throat plate (slab boilers only) and fuel retainers.
Do not fit a throat plate with a cantilever boiler. Note: On boilers the terminal which is approximately flush with the edge of the boiler must be fitted uppermost, to prevent "Kettling".
WATER CONNECTIONS
Heating systems
The size of the heating system which can be run, will depend on the output rating of the appliance. It will be necessary to work out heat loss calculations for the system proposed in order to establish the kW/hr rating. An appliance that will meet this figure can then be chosen; (for boiler outputs please refer to the brochure).
The constructional requirements of installing and connecting the appliance also need to be taken into account when selecting. Design and calculations for individual heating systems should be carried out by a qualified heating engineer. In many cases your supplier will be able to offer advice and assistance.
Direct Systems
Stainless steel boilers, either factory fitted or
not be done when in an area with soft water. If radiators are used then an indirect system must be utilised.
To connect the cylinder use 28mm copper pipes. Ensure that the pipes rise continuously to the cylinder.
Ensure that the runs are not too long, i.e. 20ft maximum each for flow and return. Install the cylinder above the level of the fire, and as close to it as possible. (the higher the cylinder the faster the circulation). Ensure that no valves are present in the circulating pipes.
Indirect Systems- The Domestic Hot Water Circuit
In addition to providing hot water the primary circuit is essential in providing a "heat leak" to absorb excessive heat produced in the event of the circulation pump shutting down.
Heat is produced in varying quantities while the fire is alight and care must be taken to ensure that effective circulation can occur around the primary circuit to carry heat away and thus stop boiling. The output of any radiator installed as a "heat leak" should not be less than 10% of the rated output of the appliance. The radiator should not be fitted with a control valve.
The cylinder must be of the indirect type with a minimum capacity of 110 litres, conforming to BS 1566 part 1.
Primary flow and return pipes should be 28mm diameter. The cylinder should be installed at a higher level than the appliance, and as close to it as possible (the higher the cylinder the faster the circulation). The flow and return pipes should not be longer than 20ft each. Pipe runs should rise continually from the boiler to the cylinder.
A radiator of approximately 25 sq.ft. should be connected into the primary circuit, if installed in the bathroom it provides a means of drying towels in the summer.
Safety Vent Circuit
This circuit consists of a cold feed pipe, expansion pipe, and expansion tank. The possibility that water may boil can never be completely ruled out, and it is therefore vital to ensure that cold water can be supplied to the boiler and steam vented from it at all times.
Acorn Multifuel Stoves | 15 |