Glow-worm ENERGY 18r -A (H-GB) - Preparing the Repair Work; Replacing Defective Components

11 Troubleshooting
22 Installation and maintenance instructions SUSTAIN ..r 0020200958_00
11.4 Preparing the repair work
1. Decommission the product.
2. Disconnect the product from the power mains.
3. Remove the front casing.
4. Close the gas isolator cock.
5. Close the service valves in the heating flow and in the
heating return.
6. Close the service valve in the cold water pipe.
7. Drain the product if you want to replace water-bearing
components of the product.
8. Make sure that water does not drip on live components
(e.g. the electronics box).
9. Use only new seals.
11.5 Replacing defective components
11.5.1 Replacing the burner
1. Remove the gas-air mixture unit. (→ Page 20)
2. Remove the burner seal.
3. Remove the burner.
4. Install the new burner complete with new seal on the
heat exchanger.
5. Install the gas-air mixture unit. (→ Page 21)
11.5.2 Replacing the gas-air mixture unit
1. Remove the gas-air mixture unit. (→ Page 20)
2. Install the new gas-air mixture (→ Page 21).
11.5.3 Replacing the heat exchanger
1. Remove the side section. (→ Page 10)
2. Remove the gas-air mixture unit. (→ Page 20)
E
1
2
D
B
C
A
3. Remove the flow pipe (1).
4. Remove the return pipe (2).
B
A
5. Remove the gas pipe.
B
3
4
A
6. Undo the clip underneath the condensate tray (4).
7. Undo the two screws (3).
A
5
C
B
8. Lift the heat exchanger up slightly and remove it to-
gether with the condensate tray.
9. Remove the ignition transformer (5).
10. Replace all the seals.
11. Install the new heat exchanger in reverse order.