Electrical Connections - Benchmark Procombi A Series Installation & Servicing Instructions Manual

4.6.5 SAFETY VALVE (fig. 12)
Connect the safety valve connection pipe to the
safety valve outlet. Connect a discharge pipe to
the other end of the safety valve connection pipe
and tighten. The discharge pipe must have a
continuous fall away from the appliance to outside
and allow any water to drain away thereby eliminat-
ing the possibility of freezing. The discharge pipe
must terminate in a position where any water –
possibly boiling – discharges safely without caus-
ing damage or injury, but is still visible.
4.6.5 CONDENSE PIPE
During normal operation the boiler produces con-
dense which is collected in a trap located in the
lower part of the boiler. A flexible pipe (condense
outlet pipe) is connected to the outlet of the trap.
The flexible pipe must be connected to a plastic
waste pipe only. The plastic waste pipe must have
a minimum of a 3º fall towards the drain. Any ex-
ternal run of pipe should be insulated to prevent
the risk of freezing.
CONNECTING THE CONDENSATE OUTLET
Gently pull the condense outlet pipe down from its
location inside the boiler until approximately 100mm
protrudes from the underside of the boiler. Con-
nect a suitable plastic (not copper) pipe (no less
than 20mm diameter) to the outlet pipe and ensure
it discharges in accordance with building regula-
tions or other rules in force.
4.7

ELECTRICAL CONNECTIONS

The electrical supply must be as specified in sec-
tion 3/3A. A qualified electrician should connect
the electrical supply to the appliance. If controls
– external to the appliance – are required, a com-
petent person must undertake the design of any
external electrical circuits, please refer to section
8 for detailed instructions. ANY EXTERNAL CON-
TROL OR WIRING MUST BE SERVED FROM
THE SAME ISOLATOR AS THAT OF THE AP-
PLIANCE. The supply cable from the isolator to
the appliance must be 3-core flexible sized 0.75mm
to BS 6500 or equivalent. Wiring to the appliance
must be rated for operation in contact with sur-
faces up to 90ºC.
4.7.1 CASING REMOVAL (fig. 13)
To gain internal access to the appliance you must
first remove the casing, proceed as outlined below:
• remove the screws (B) located on the underside
of the casing.
• lift the casing upward to disengage it from the top
locating hooks and then remove.
• store the casing and screws (B) safely until
required. Re-fit in the reverse order.
4.7.2 APPLIANCE TERMINAL BLOCK
The appliance terminal block is located on the
rear of the control fascia. Remove the casing as
described in 4.7.1. Gently pull the control panel
forwards and down. Locate the terminal block cover
(fig. 14).
NOTE
The appliance comes with a factory fitted link
('TA') to allow basic operation of the boiler via the
mode selector switch. If it is anticipated that
external controls will be required please refer to the
Fig. 13
Optional devices
(24V) terminal block
Fig. 14
Fig. 15
wiring diagrams in section 8 for more detailed
information.
4.7.3 CONNECTING THE MAINS (230V) INPUT (fig. 15)
Unhook and remove the terminal block cover
(230V). Pass the cable through the cable anchor-
age point. Connect the supply cable wires (LIVE,
NEUTRAL, & EARTH) to their corresponding ter-
minals (L, N, & E) on the appliance – high voltage
– terminal block. When connecting the EARTH
wire, ensure that it's left slightly longer that the
others, this will prevent strain on the EARTH wire
should the cable become taut. Do not remove the
link wire unless additional external controls are to
be fitted (see section 8). The securing screw on the
cable anchorage should now be tightened. This
must be done before the terminal block cover is re-
fitted in its position.
NOTE
It is the installer's responsibility to ensure that the
appliance is properly Earthed. the manufacturer
cannot be held responsible for any damages or
injuries caused as a result of incorrect Earth wiring.
B
Mains (230V)
terminal block
11