RAYBURN
COOKERS
INSTALLATION
THIS SECTION
OTHER SECTIONS
CENTRAL HEATING
Heatranger Oil-fired Models 360K & 360D
Direct, Sealed or un-vented systems must not be used with this model
The heating pipe-work should be a two-pipe, fully-pumped small bore system with the radiators having the appropriate control valves and lock-shield valves for balancing. The control valves may be thermostatic, but it is essential that at least one radiator should remain in operation fitted only with lockshield valves, to provide heat dissipation and a pump overrun circuit.. See diagram below for sizing in relation to the cylinder capacity.
The system must be fully flushed through and filled with an appropriate corrosion inhibitor
Since radiator sizes and outputs vary considerably, it is not possible to quote the actual number of radiators that can be served by each model. It is more appropriate to refer to the radiator manufacturer's rated output (kW/hr) and to match this to the Rayburn's boiler output specification, which is a maximum of 17.6 kW/hr
To control the hot water/central heating system it is necessary to use motorised valves. These may be of the 3 port mid-position type or 2 port zone valves, although the former are preferred. If the latter are used, then it is essential to ensure that the route to the dissipation radiator is open at all times as a pump overrun circuit.
A two channel programmer may be used for controlling the hot-water and/or central heating via the motorised valve. One of these circuits must of course be live to obtain cooking facilities, preferably the central-heating, since no room thermostat should be fitted, there is less likelihood of the burner cutting off during cooking operations.
Although a frost thermostat can be incorporated, a room thermostat should not be fitted.
Note the suggested wiring plans shown below, which are somewhat different than conventional system wiring methods. The circulating pump must be wired to the appropriate terminals in the Rayburn, so as to guarantee the pump overrun facility.
In the diagram shown above, the Rayburn burner is controlled by closing the loop between cooker terminals 4 & 5.
Putting a live feed onto the zone valve Orange wire, achieves cooking + hot water
Putting a live feed onto the orange and white wires, gives cooking + hot water + heating
Putting a live feed onto the grey and white wires, gives cooking + heating. In this case the valve supplies a live feed outgoing on its orange wire to fire the Rayburn.
In the diagram shown above, the Rayburn burner is controlled by closing the loop between cooker terminals 4 & 5. This is achieved using the zone valve internal switching on either or both of the grey & orange wires.
Note that there are two different ways of using a cylinder thermostat to give control.
The finished system should be carefully balanced to give a temperature differential of 10 - 14 degrees C. across the flow and return pipes, when operating at full output.
The system must be installed in accordance with local water bylaws, Building Regulations and British standards and we strongly encourage that the plumbing and electrics be carried out by a competent person.