Operation; Domestic Hot Water; Space Heating 'N' Models - Benchmark mCHP BoilerMate Design, Installation And Servicing Instructions

2.0 SYSTEM DESCRIPTION
F & E cistern
S1/S2
Thermal Store
P1
S4
S6
PHE
S3
3kW - 6.0kW
Electric heater
S5
HW
CW
mCHP
OUT
IN
return
mCHP
UNIT
Figure 2.3 Schematic diagram of mCHP BoilerMate2000 (N)
F & E cistern
S1/S2
Thermal Store
P1
S4
S6
PHE
S3
3kW - 6.0kW
Electric heater
S5
mCHP flow
HW
CW
OUT
IN
mCHP
UNIT
Figure 2.4 Schematic diagram of mCHP BoilerMate2000 (R)
Supplied By www.heating spares.co Tel. 0161 620 6677
P2
P3
CH
CH
flow
rtn
mCHP
flow
Space heating circuit
P3
Diverter
Valve, V1
Bypass
valve
mCHP Heating
return
flow
Space heating circuit
The mCHP BoilerMate A-CLASS
controls are shown in figure 2.5. All models
are fitted with a single channel programmer
and summer winter switch for programming
heating and hot water 'on' times. All models
can be supplied without this programmer for
use with a remote 2 channel programmer or
programmable room thermostat etc. These
should be supplied and specified by the
installer.

DOMESTIC HOT WATER

ALL MODELS
The domestic hot water function is identical for
models'N'and'R' . The mains pressure domestic
hot water is heated instantaneously by means
of plate heat exchanger.
In the standby mode, the controller maintains
the plate heat exchanger between pre-set
temperature limits by cycling the plate heat
exchanger pump, P1. This cycling is controlled
by sensors S3 and S4.
When a hot water tap is opened, the controller
senses the flow of water by means of sensors
S3 and S4 (figures 2.1, - 2.4) and activates the
plate heat exchanger pump, P1. As long as the
water is flowing the controller regulates the
pump speed to maintain the domestic hot
water delivery temperature between 53
and 55 o C.
When the loss of hot water flow is sensed, the
controller switches the pump, P1 off.
SPACE HEATING –
'N' MODELS
(Figures 2.1 & 2.3)
The space heating demand is controlled by the
heating programmer and the room thermostat
and its operation independent of the operation
of the mCHP.
When both the space heating programmer and
the room thermostat are calling for heat, the
controller senses these demands and switches
on the central heating pump, P2.Therefore the
preheated water from the thermal store flows
to the space heating i.e. radiator circuit.
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appliance user
2.2.1
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2.2.2