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3.5 ELECTRICITY SUPPLY AND WIRING DIAGRAMS
A-CLASS
All mCHP_BoilerMate
models are fitted with electric backup heaters rated at 6kW
as standard. Therefore the single mains electricity supply to the appliance must be
rated at 32A at 230V ac and connected to the appliance through a 2-pole local isolator.
All fuses must be ASTA approved to BS 1362. This supply is internally split and fused
for the control and power circuits.This appliance MUST BE EARTHED.
The BoilerMate only supplies the control signal power to the mCHP unit.Therefore the
mCHP unit must be connected to the mains supply via its dedicated 2-pole isolator as
per manufacturer's instructions.
The internal wiring diagrams are shown in figures 3.7 - 3.10 and typical external wiring
arrangement is shown schematically in figure 5.2.
3.6 APPLIANCE CONTROLLER
The appliance controller (figure 3.9) has a 2 digit display and 2 push buttons which are
used to check the status of the appliance, check and set its identity and interrogate it
for the current faults and the fault history.
The 2 digit display on the main PCB is controlled by 2 buttons B1 and B2 The flow
chart of display modes is shown in figure 3.10. Generally, each press of button B1
cycles the display from top to bottom and each press of button B2 cycles the display
functions from left to right.
The buttons B1 is also used to reset the appliance i.e. clear the lockout errors and
reset the appliance. (Note: Appliance resetting can also be carried out using the push
button on the front panel)
3.6.1 APPLIANCE TYPE SELECTION
A-CLASS
The mCP BoilerMate
is fitted with an identity (ID) resistor which is read by the
controller for comparison with the appliance type (code) set on the controller.The two
must match for the controller/appliance to function.Therefore if either the appliance
code setting or the ID resistor is wrong, the appliance will shut down safely and flag
the error code until the fault is rectified.The controller codes and the ID resistor values
A-CLASS
for the mCHP-BoilerMate
setting the appliance code on the controller is described below.
• The appliance selection menu (A0 ...A9) on the controller is hidden.It is only possible
to get to the appliance selection using the reset button (Left hand, B1) on the main
board.
• When going from the show ' locking error' to show 'blocking error' menu (see figure
3.10),do not release the button but hold it for 10 seconds.The display will change from
'c' to 'A' . At this stage the push button (B1) can be released.
• The appliance type can now be selected by using right hand push button, B2, e.g.
A03.
Press the reset button, B1, to accept the setting.
If the selected appliance code does not match with the ID resistor fitted to the appliance,
then, an error '33' will be displayed.
3.6.2 DISPLAY IN NORMAL (STANDBY) MODE
In the standard/normal mode the 2 digit display shown in figure 6.2 indicates the
status of the appliance inputs and outputs by switching on the appropriate segments
of the display.
Supplied By www.heating spares.co Tel. 0161 620 6677
TECHNICAL SPECIFICATION 3.0
are listed in table 3.6.The procedure for checking and
3.6.3 SENSOR
TEMPERATURE
The sensors used in this appliance are
listed in table 3.7. In this mode the current
temperature read by the selected sensor
is displayed.The temperature reading is
displayed by alternatively flashing the sensor
number and its temperature reading or the
error code shown in section 3.6.5.
3.6.4 CONTROL
TEMPERATURE SET
POINT READING
In this mode the set points used in controlling
the store heating and hot water generation
are displayed.The set point is displayed by
alternatively flashing the S1 ... S6 and the
corrseponding set point.The available set-
point reading are shown in table 3.8
3.6.5 FAULT CODE
INDICATION
The fault codes are divided into the following
categories and are tabulated in table 3.9
• Locking Errors - These errors clear
automatically when the fault is cleared and
these error codes are preceded by letter 'C' on
the 2-digit controller display.These errors will
clear automatically when the fault is rectified.
• Blocking Errors - These errors can only be
cleared by resetting the controller and these
error codes are preceded by letter 'c' on the
digit controller display.
• Non critical sensor errors are stored in
warning tables and under these conditions
the controller uses alternative control
strategies to keep appliances functioning and
provide limited service.
E1
Open Circuit
E2
Short Circuit
E3
Temperature greater than 99ºc
Page 19
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