Burner Assembly; Gas Control Valve; Magnesium Anodes - andrews CSC 39 Installation Manual, Operation And Service Manual

SECTION 6
BURNER
ASSEMBLY
GAS CONTROL
VALVE
MAGNESIUM
ANODES
30
SERVICING
Annually, remove the main burner rack assembly to clean orifices and related parts of any
dirt or other foreign matter. Inspect the burner ports for obstructions or debris and clean
with a wire brush, vacuum, or use a mild detergent to clean as necessary. Inspect the
pilot. Carefully clean the electrode and flame sense rod with emery cloth. The spark
electrode (rod closest to the pilot hood) gap should be 1/8 in.
NOTE: It is vital for proper and safe operation that the main burner rack is replaced in it's
original position.
To remove the burner rack assembly, follow the procedures outlined below.
a) Shut off the gas and electrical supply to the heater.
b) Remove the pilot tube fittings at the gas valve and combustion box.
c) Disconnect wires to gas valve. Open control box and disconnect pilot spark and flame
sense wires. Remove the wire raceway cover below the control box.
d) Disconnect the gas pipe union below the gas valve.
e) Remove the three screws securing the gasketed manifold pipe flange on the left side of
the combustion box.
f) Remove the burner access panel from the front of the combustion box.
g) Carefully remove and push the pilot wire grommet into the combustion box with the
pilot wires.
h) Disconnect the pilot tube fitting on the inside bulkhead fitting of the combustion box.
i) Unthread the gas pipe assembly from the manifold inside the combustion box.
j) Remove the screw securing the burner rack on the top right panel of the combustion
box.
k) Slide out the burner rack assembly.
To re-install the burner rack, reverse the above procedures.
The gas control valve should be checked and cleaned. Remove any debris from the valve
inlet filter using a soft brush or by blowing with low pressure air.
After servicing, Check:-
1. Soundness of any gas joints broken or disturbed and seal any leaks.
2. Burner pressure/gas rate at maximum thermostat setting.
3. Operation of heater is correct. Reset controls to user's requirements.
Magnesium sacrificial anode(s) is (are) fitted to the top of the storage vessel. The anode
will prevent corrosion of the storage vessel. Anode condition should be checked annually
and replaced if excessive wear is present.
1. Withdraw each anode using an
21mm diameter.
2. An anode should be replaced, if, at any point along it's length, the diameter is reduced
to half, or less of original. Particular attention should be paid to the ends.
3. If the anode is encrusted with limescale, it should be either wire brushed to reveal
bright metal or replaced.
Where Correx TM anodes are fitted, no maintenance is necessary.
11
⁄ in AF socket spanner. A new anode measures
16