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5.4 ELECTRICAL WIRING
The appliance circuit diagram is shown in figure 3.6 and the external wiring terminal
details are shown in figures 5.4 and 5.5. All external controls and equipment must be
wired to these terminals. The mCHP unit manufacturers wiring instructions should be
read in conjunction with this manual before commencing the wiring process.
5.4.1 GENERAL
(a) This appliance MUST BE EARTHED. The wiring must comply with the current i.E.E
Requirements for Electrical installations (BS 7671) and the requirements of the
local electricity utilities.
(b) it is the responsibility of the competent electrical installer to use the details in
this manual with the latest British Standards. All external wiring to the mCHP unit,
programmer and the room thermostat must be in accordance with the latest i.E.E.
Wiring Regulation, and any local regulations which may apply.
(c) The appliance has an integral either 6kW electric backup/boost heater and therefore
the supply must be rated at minimum 32A (at 230V~, 50Hz) as discussed in section
3 of the manual.
(d) All electrical wiring to the appliance should be secured to prevent the wires/cables
touching any hot surfaces inside and outside the appliance case.
(e) The mCHP appliance generates heat and electricity. Therefore there must be
separate supplies and isolators for the BoilerMate and the mCHP unit. These isolators
must provide complete electrical isolation for the system, via a fused double pole
isolators with a contact separation of at least 3mm in both poles.
(f ) in the event of an electrical fault after installation of the appliance, preliminary
electrical checks must be carried out i.e. Earth Continuity, Short Circuit, Polarity,
and Resistance to Earth.
5.4.2
WIRING THE APPLIANCE (BOILERMATE)
(a) Ensure that the electricity supplies to both the BoilerMate and the mCHP unit are
switched off before commencing electrical work.
The mCHP BoilerMate is supplied with a pre-wired 2m long twin + E cable rated at
32A. Connect this cable to the local BoilerMate isolator (See figure 5.4)
(b) When the thermal store requires heating, the BoilerMate controller will generate
a 230V ac on/off signal at terminals labelled 'SL-O' and 'N' .
These terminals should be wired to the appropriate connection/terminals of the
mCHP unit as per manufacturer's installation manual. The wiring arrangement
for the WisperGen mCHP unit is shown in figure 5.4.
(c) if the heat energy supplied to the thermal store is not sufficient when the mCHP
unit is running in normal mode, then the BoilerMate controller will generate a
230V ac boost signal at terminals labelled 'SL-B' and 'N' .
if necessary these terminals should be wired to the appropriate connection/
terminals of the mCHP unit as per manufacturer's installation manual. The wiring
arrangement for the WisperGen mCHP unit is shown in figure 5.4.
(d) if the mCHP unit has electrical output (230V ac) for controlling the mCHP/System
pump. Then these output terminals must be wired to the BoilerMate terminals
INSTALLATION AND WIRING 5.0
labelled 'PL' , 'PN' and 'PE' . This will transfer
the control of the pump from BoilerMate
to the mCHP unit. The wiring arrangement
for the WisperGen mCHP unit is shown in
figure 5.4.
(e) mCHP_BoilerMate is supplied with a single
channel heating and hot water programmer.
Therefore only room thermostat wiring is
required. The room thermostat wiring
should be connected to terminals 'L2' , 'SL-R' ,
'N' and 'E' as shown in figure 5.4
(f ) The remote 2-channel programmer and
the room thermostat can be wired to the
mCHP BoilerMate with ' No clock' option as
shown in figure 5.5.
(g) DO NOT SWiTCH ON the electricity supply
to the appliance at this stage. Before
switching on the supply ensure that the
system is full of water and commissioned as
per section 6 of this manual and the mCHP
unit manufacturer's manual.
Page 29
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