Specifications

Page 14
3.0 TECHNICAL SPECIFICATION
Table 3.2 Technical specification of mCHP BoilerMate
A-CLASS
Thermal and Electrical Data
BMA225 BMA235
Time to heat whole
store (10-75ºC)
8kW thermal mCHP min 116 131
10kW thermal mCHP min 93 105
15kW thermal mCHP min 62 70
Time to heat top of
store (10-75ºC)
6kW electric backup
‘Switch’(1)
min 77 87
Time to recover whole
store (35-75ºc)
8kW thermal mCHP min 71 81
10kW thermal mCHP min 57 65
15kW thermal mCHP min 38 43
Time to recover top of
store (35 to 75°C)
6kW electric backup
‘Switch’(1)
min 47 54
Maximum thermal rating of the mCHP unit kW 12 15
Maximum pressure heating circuit bar 3 bar 3 bar
Volume of primary coil litres 5 litres 5 litres
Expansion vessel size litres 6 - 8 litres 6 -8 litres
Allowance for hot water load (3) W 750 1,000
DHW flow rate at 35K temperature rise (4) 1/min Up to 35 Up to 35
Hot water draw-off volume at 35K temperature
rise & at 18 1/min (4) from fully charged store
litres 250 282
Thermal insulation
characteristics
Type PU-Foam, ‘Zero 0DPM’ and metal cased
Average thickness mm 52 52
Heat loss rate(5) kWh/24h 2.452 2.635
Electrical Data BMA225 BMA235
Electrical rating at 230V ac, 50Hz, 1 ph supply(6) W 6,500 (approximate 28A) Supply must rated at 32A minimum
Maximum power
consumption at 230V
ac, 50Hz
Standby mode W 30
mCHP - Operating (7) W 300
‘Switch’ - Operating W 6,300
Control/Boiler system W 1 x 6A MCB
Control/Boiler system W 1 x 6A MCB
Internal circuit
‘Switch’ backup 2 x 16A MCB
Protection devices
Notes:
(1) All mCHP BoilerMate
A-CLASS
models are fitted with a 6kW electric backup system i.e. ‘Switch’ which is used to boost the
heat in the store if the output from the mCHP unit is not sufficient in extreme demand conditions, The ‘switch’ is also used
to provide backup heating and hot water in the rare event the mCHP unit fails.
(2) The hot water allowance used for adding to the design heat loss of the dwelling (BS6700) for sizing the thermal rating
of the mCHP unit.
(3) Based on the average store charge temperature of 77ºC and mains cold water inlet temperature of 10ºC
(4) Heat losses measured at 55K steady temperature difference as specified in the WMA Specification for Thermal Stores
(5) 6kW ‘Switch’ is integrated in the mCHP BoilerMate
A-CLASS
control system. Therefore electricity supply to the appliance
via the two pole isolator must be rated at 6.5kW at 230V ac, 50Hz. It assumed that the mCHP unit is supplied via separate
isolator and boilerMate only provides the control signal.
(6) mCHP unit takes its power from an independent circuit via its own isolator.