Stovax PR0741 - Manual (Page 30)

4.8 Replace with a new pilot assembly and check the spark
gap, Diagram 10.
10
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4.9 After reassembly, check for gas soundness and carry out a
flame failure functional check as detailed in the flow chart,
especially the mag drop out time.
5. GAS vALvE
5.1 Disconnect the 2x8mm and 1x4mm gas pipe fittings at the
back of the gas valve and also disconnect the
thermocouple, Diagram 11 arrows B and E.
11
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B
E
5.2 Disconnect the injector nut, Diagram 12 arrow D.
12
D
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5.3 Undo the two bolts securing the gas valve to the fire
and remove the valve.
5.4 Replace in reverse order.
5.5 Check all joints for gas leaks, check operation of the
thermocouple and ignition lead.
6. Mag UnIT
6.1 Remove the fire, refer to section 1.
6.2 Undo the thermocouple nut. Diagram 13 arrow B.
13
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B
6.3 Undo the mag unit retaining nut at the back of the control
valve behind the thermocouple nut.
6.4 After removing the retaining nut, the mag unit can be
tapped out and a replacement fitted.
6.5 Replace the mag unit retaining nut and tighten. Note - this
is a gas-tight seal.
6.6 Replace the thermocouple and check for gas leaks.
6.7 After reassembly, carry out the flame failure functional
check as detailed in the flow chart, especially the mag unit
drop out time.
7. MAIN INjECTOR
7.1 Undo the injector compression nut and valve nut , Diagram
14 arrows D and E, pull the pipe clear of the injector body.
14
D
E
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SERvICING INSTRUCTIONS
REPLACING PARTS
30