Ready To Burn
Ready To Burn: Version 1.0 October 2015
Page
9
of
24
VENTILATION
The RTB range of wood pellet boiler draws air for combustion from the room in which it is
located. Any such room or space containing an appliance must have sufficient permanent air
supply to the boiler. The ventilation area provided must be in accordance with the
requirements of The Building Regulations Approved Document J – Section 2: Appliances
burning solid fuel.
It is always recommended that RTB be installed with a draught stabiliser, as such requires a
permanent air vent with a total free area of at least 8.5cm
²
/kW to ensure the effective
operation of the chimney system and discharge all of the products of combustion.
It is recommended that the ventilation is positioned on the same side of the building as the
chimney to prevent any pressure difference during windy conditions.
Recommended permanent free area vent sizes.
RTB 10 (10kW)
85cm
²
RTB 16 (17kW)
144.5cm
²
RTB 30 (25kW)
212.5cm
²
RTB 50 (46kW)
382.5cm
²
HYDRAULIC SYSTEM
The RTB range of boiler must be installed with an approved ‘shunt’ or mixing valve to
prevent cool return water entering the boiler. Cool return water will cause condensation to
form within the combustion chamber and corrode the boiler.
Note: Failure to install an approved mixing valve will invalidate any
warranty claim should one arise.
The boiler circulation pump should always be positioned in the flow pipe from the boiler
between the boiler and the tee for the mixing valve. The mixing valve temperature sensor
should be positioned on the return pipe between the boiler and the mixing valve tee, as
shown
below.
The RTB range of boiler can be installed onto either an open vented or pressurised heating
system. If the system is pressurised then the pressure relief valve must be rated at no more
than 2.5bar maximum, over pressure can damage the boiler and will invalidate the warranty.
