A PROCON 45 or PROCON 75 is a good solution for smaller commercial systems where the required capacity is 75kW or less.
Essential design information is given below.
The boilers must be installed strictly in accordance with the PROCON Instructions. Once installed, the entire system must be cleansed and flushed to remove debris, flux residues etc. The system must be filled with clean, chemically neutral water. Water hardness must not exceed 3.6 mol/m³.
A suitable corrosion inhibitor ‘INIBAL’ should be used in all systems.
The required concentration is 1 - 2% of system capacity.
Failure to observe these requirements will render the guarantee on the
Dimensions and Location
The boiler should only be installed in a dry indoor location where there is sufficent space to accomodate the boiler and provide the clearances needed for maintainance. The Procon 75 model should be installed in a suitable boiler house location.
External dimensions of the Procon 45 and 75 boilers
For ease of installation and maintainance the following clearances should be observed:
- Above the boilers 300mm minimum
- Below the boilers 150mm minimum
- Beside the boilers 50mm minimum
- In front of the boilers 450mm minimum
Flueing and Ventilation
Procon boilers are designed to work with flue resistances of up to 400pa.
The flue should be completely gas and water tight and adequately supported over it's entire length. Refer to the installation instructions for detailed design and installation information.
The top of the Procon boiler is fitted with a concentric flue outlet (80/125mm). Two different types of flue installation are possible.
Exhaust Only - Type A installation
This is appropriate when a boiler is installed in a ventilated location such as a plant room. Combustion air is drawn from the space in which the boiler is installed. The space must be adequately ventilated to provide combustion air to the boiler.
The combustion products are exhausted via an 80mm diameter PPS flue pipe system. A range of flue components including extension pipes and bends are available. Full information on flue system design is given in the boiler instructions but flue system lenghts of up to 12 meters are permissible. Longer flue systems are also possible but please contact RVR for advice.
Room Sealed - Type B installation
A room sealed installation may be achieved using concentric 80/125mm flue components. Combustion air is drawn into the boiler through the outer 125mm pipe and the products of combustion are expelled through the inner 80mm pipe. This type of installation has the advantage that ventilation of the boiler installation location is not required.
Full information on flue system design is given in the boiler instructions but flue system lenghts of up to 12 meters are permissible. Longer flue systems are also possible but please contact RVR for advice.
Typical room sealed installation of Procon boiler with horizontal balanced flue kit.
Room sealed installation of PROCON boiler with extended flue kit.
The use of a low velocity header is strongly recommended for all systems. Further information on design and sizing these is given on the low velocity distribution header page. The general arrangement of the hydraulic system is shown in the diagram below.
Typical hydraulic circuit for single wall mounted PROCON boiler
The general arrangement of the wiring is shown below. The following wiring connections are required.
- 230V power connection
- Volt free central heating enable input
- Volt free safety interlock input (optional)
- Outdoor Air Temperature Sensor input(optional)
- DHW Sensor input(optional)
- Central Heating Output (230V, 2A)(optional)
- DHW Heating Output (230V, 2A)(optional)
Typical wiring of single PROCON boiler
The connection of the outdoor air sensor enables weather compensation to be used. When a DHW heating demand is present (on DHW sensor input) the boiler enters DHW priority mode. The CH output is disabled and the DHW output is simultaneously enabled.