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DESIGN
Manual air vent (MAV)
relief valve
S4
S7
Externally
mounted
temperature
CH
compensation
boost
sensor
3kW
S5
HP
Boiler
(primary)
Buddy
circulator
P1
Heat
pump
Sealed primary system expansion/filling
components available as an optional extra
A BoilerMate A-Class HP-DEM is a floor standing packaged mains pressure unvented
hot water appliance designed for use with the Mitsubishi Electric Ecodan air source
heat pump. All models are factory fitted with all the necessary safety and control
equipment for connecting to the domestic water systems, heat pump and the heating
system as can be seen from figures 1.1, 1.2, 1.3 and 1.4.
The appliance has been specifically designed to maximise the efficiency of the heat
pump and use the energy to provide improved space heating and mains pressure
hot water performance.
The built in controls monitor the demands for heat ensuring that the low cost energy
from the heat pump is used whenever possible and top up from the conventional
heat source is only initiated when the flow temperature from the heat pump is not
sufficient to meet the demands. The controls are set to provide hot water priority, ie.
if there is a demand at S3, any heating demands will be suspended until the store
temperature reaches the point where S3 is satisfied.
All models are designed to heat the domestic hot water indirectly up to the maximum
temperature possible with the heat pump and then boost the temperature by means of
a 3kW immersion heater up to the required set temperature. All models have connections
for a zone 1 circuit where the central heating flow temperature can be boosted by means
of an inline electric heater to the preset design temperature. However, the 210 and 240
models also have connections for a zone 2 circuit where no temperature boost is provided.
This enables separate radiator and underfloor heating circuits to be provided, operating at
HWS expansion vessel(s) supplied separately
T&P
Primary
relief
valve
CH zone
HW zone
valve
valve
MAV
System
circulator P2
IV
Discharge
pipe
S6
Automatic
bypass valve
(if required)
IV
IV
BoilerMate 180 HP-DEM
with the appliance for fitting on site
S1/2
HWS
boost
3kW
S3
Zone 1 CH system (radiators or underfloor)
different design temperatures if required.
The BoilerMate A-Class HP-DEM is supplied
with an outside temperature compensation
sensor which needs to be mounted externally
and wired back to the connection terminals
provided in the appliance (using the 10m of
cable provided). This will then automatically
adjust the operation of both zone 1 and zone 2
heating circuits to take account of the external
temperature and reduce the running costs.
8 metres of 8 core signal cable is also provided
for connection between the BoilerMate A-Class
HP-DEM appliance and the heat pump (see
page 30 for details).
The most economical way of designing the
heating systems is to utilise the temperature
available from the heat pump itself. For this
reason, underfloor/low temperature radiator
systems should be chosen where possible. In
these situations, the electric boost heater can be
disabled at the control panel if required.
Page 6
Secondary HWS
return connection
HWS outlet
Combination
valve
Discharge
MCWS
inlet
pipe
Balanced
CWS outlet
Figure 1.1
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