Replacing Parts; Removal Of Electrodes - Space-Ray ADU25 Installation And Operation Instruction Manual

18.0) REPLACING PARTS

Only use genuine Space-Ray replacement parts. Parts are available from the factory for replacement by a
licensed person. Refer to the Replacement Parts Guide in Section 21.0 for all replacement parts.
IMPORTANT: Disconnect gas and electricity supplies to the appliance before carrying out any repair work. This
work can be carried out at high level using a purposes designed access tower, but it is preferable that this work
should be carried out at ground level.

18.1) REMOVAL OF ELECTRODES

Fig. 38
This range of radiant tube heaters employs a single probe electrode system whereby both the spark generation
and flame supervision operations are carried out via a common electrode. The second electrode provides the
earth path for the ignition spark. The two electrodes are identical, therefore either lead (grey HT or green/yellow -
earth) may be connected to either electrode.
1. Open the Control Box door after releasing the two toggle latches.
2. Disconnect the grey HT ignition/flame sensor lead and the green/yellow earth lead from the electrodes
by gently pulling the connectors, using pliers.
3. Unscrew the M6 x 16 set-screw securing the electrode carrier to the Control Box and remove the
Electrode Assembly.
4. Remove any foreign matter from the Electrode tips and check that the spark gap is 3.5mm. If the
Electrode rods are badly oxidized, replace the electrodes.
5. Upon re-assembly, ensure that the HT lead and earth lead connectors are securely attached to the
Electrodes.
Form #4420110
Oct 2019 -57-