Thermaflow TH12 - Electrical Supply; Heating System Controls; Boiler Position

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2.1.5 Electrical supply
Means of disconnection of the electrical supply to the boiler must be incorporated in the fixed
wiring in accordance with the wiring rules.
Two isolators are required, one for the 24hr supply, and the other for the interrupted supply (off
peak if available)
Means of disconnection of the 24hr supply should be by a double pole switched fused spur box (fuse
rating 3 amp), having a minimum contact separation of 3mm in each pole. The fused spur box should
be readily accessible and adjacent to the appliance. It should be identified as to its use.
Means of disconnection should not be fitted in a room containing a fixed bath or shower. The 24hr mains
supply cable and other cables for external controls must be heat resistant and flexible PVC type of at
least 0.75mm2 (24/ 0.20mm)
Means of disconnection of the interrupted supply (off peak) should be by a double pole switched
(60amp isolator with a 40 amp MCB Type C for the TH9/ model) and a switched (60 amp isolator with a
50 amp MCB Type C for the TH12/ model), having a minimum contact separation of 3mm in each pole.
The switched isolator should be readily accessible and adjacent to the appliance. It should be identified
as to its use.
Means of disconnection should be readily accessible and adjacent to the appliance. It should be
identified as to its use.
The interrupted mains supply cable must have a cross sectional area of at least (10mm² for the
TH9/ model) and (16mm² for the TH12/ model). The mains supply cable from the isolator to the
boiler should be preferably encased by flexible conduit.
2.1.6 Heating system controls
The heating system should have installed: A timer and room thermostat or a programmable room
thermostat controlling the central heating system.
Thermostatic radiator valves should be installed in addition to the room thermostat for better economy
and energy saving.
2.2.1 Boiler Position
The boiler must be installed in accordance with the rules in force in the countries of destination. This
boiler is not suitable for fitting outside.
Any electrical switch must be positioned so that it cannot be touched by a person using the bath or
shower.
The boiler must be positioned on a level base or floor which is sufficiently robust to take its weight,
(Refer to table 1, “Data”)
If the location of the boiler or any part of the system is subject to severe cold weather conditions, it is
recommended that a frost thermostat is fitted. Any part of the system that may be vulnerable to freezing
must be protected.