1735 Technical Manual - Novatech Controls

4.4 Installing the Auxiliary Thermocouple
Weld a 1/2 inch BSP mounting socket to the flue within about 300 mm (12”), and upstream of the oxygen
probe. The thermocouple should be of similar length to the oxygen probe to prevent flue temperature
distribution errors.
The thermocouple should be connected to terminals 7 & 8. These terminals will not be available for an
auxiliary thermocouple if a second probe has been installed.
4.5 Shield Connections
All external wiring to the 1735 transmitter should be shielded. Do not connect shields at the field end.
Simply clip off and insulate. There are two M4 earth screw terminals available in the 1735 transmitter. An
extra terminal strip may be required to connect all shields together. This should be supplied by the installer.
4.6 Earth Connection (PE)
The PE (protective earth) input connection must be made to the earth stud on the right hand side of cabinet.
The PE input connection must be the first connection onto the earth stud and it must be secured by a
separate nut and spring washer. All other earth connections (bonding connections) can be made on either of
the two earth studs in the base of the cabinet.
The controller MUST be securely earthed.
Right hand
earth stud
Incoming
PE wire
Other bonding
earth wires
Assembly of the PE and bonding connections on the earth stud
April 2012
22 1735 Water Vapour Transmitter