Integration with Building Management Systems (BMS)
M2G is an advanced intelligent retrofit boiler optimisation control that is fully compatible and complementary to all types of BMS/BEMS systems.
Most BMS companies and manufacturers have BMS systems that control the various heating and cooling zones, etc, by well tested and established methods, such as “weather compensation”, controlling 3 port mixing valves (Variable Temperature circuits). The building dynamics can also be taken into account by specifically controlling “optimisation” of comfort levels in the various zones etc, in the above cases the boiler/burner plant may be simply enabled/ disabled according to the required room temperatures or occupancy times.
In some cases, the BMS may sequence the boilers according to load requirements. This is normally done via a common system flow or return temperature sensor determining a set point and P.I action to ”cascade” the boilers as and when required. The disadvantage of this type of sequencing is, unless you isolate the boiler hydraulics that are not currently firing, this will cause system hysteresis and temperature dilution of the required flow temperature set point.
The M2G is interlocked by fail safe relays that are connected in series to the burner/boiler control or stat circuit. The BMS is also connected into this circuit via volt free contacts.
The BMS system will give a “call for heat” or enable signal, the M2G will in turn check for boiler demand and the boiler memorised load profile (heating demand). The M2G adaptive algorithms will ensure that the best firing stage is established for the current load conditions and invoke a “save mode”. The M2G has been designed specifically to overcome and avoid unnecessary “dry cycling” of the boiler operation under changing load conditions.
To further complement the operation of BMS with M2G, it is possible to interface the inputs/outputs of the unit, to volt free relays and in this way it would be possible for the BMS system to directly monitor the M2G operations if required.
Building Management Systems control various and well defined strategies for heating, cooling and lighting etc. In many cases the BMS will have a central control and a number of outstations connected to all the required elements of the building facilities. To understand what control strategies are in place with your BMS your FM provider, maintenance provider or BMS company will help.
Why is M2G required when a BMS is in place?
In the case of boiler house plant control, the BMS outstation may have direct control on the operation of boilers and pumps etc. To ensure that required comfort and occupancy times are maintained with the maximum fuel efficiency, the boiler/burners will be enabled or disabled, based on bespoke strategies that are written specifically to the customer’s building requirements and boiler plant design during the commissioning process.
The boilers are normally connected to the heating system via common flow and return headers; in this case the BMS will have temperature sensors installed to measure the blended common header temperatures from all of the boilers.
The boiler set point temperature will be maintained by the boiler’s own thermostat or temperature control connected directly to the boiler flow pipe work. In most cases, the BMS will turn off or on the boiler/burner based on the blended header temperature set point. The BMS does not typically measure the direct flow and return temperatures of each individual boiler.
The M2G has two digital temperature sensors to measure and calculate the direct temperature profile of each boiler, thereby establishing if the boiler thermostat or BMS is making a false “call for heat” due to standing losses
Building Management Systems controls the boilers' operation from a blended system temperature and does not control the individual boilers
The BMS does not typically:
Measure the direct boiler flow/return temperature of each individual boiler.
Measure the load profile (heating demand) of each boiler.
Measure and check the control circuit (boiler thermostat or BMS) status for “call for heat” and set point “satisfied”.
Directly control the firing stages for high/ low firing burners.
Give “first firing” modes to ensure system stability and boiler setpoint is always maintained.
M2G is specifically designed to directly optimise and control boiler load and is designed to complement BMS and other boiler controls i.e. sequencing, weather compensation, optimum start/stop control.
M2G has been extensively researched and independently tested to ensure it delivers what it promises: significant savings on commercial fuel bills and carbon emissions with typical payback periods under 2 years.
M2G is verified by the EU Environmental Technology Verification scheme.