Fig. 44
page 45
15.0 Changing Components
15.1 Changing Components
IMPORTANT: When changing components ensure that both the gas and electrical supplies to the boiler are isolated before any work is started.
"The boiler cannot be switched off at the boiler, therefore it is important to isolate the electrical supply at the mains fuse."
Hazardous materials are not used in the construction of these products, however reasonable care during service is recommended.
When replacing the combustion box door after changing components, it is essential that the retaining screws are tightened fully.
After Changing Components a combustion check should be performed (see
This is especially important on gas carrying parts, and those that may affect combustion (e.g. fan).
1. Before changing any components please read
Important Information.
2. Remove the outer case and lower door panel (see "Fitting the Outercase"
).
WARNING: The PCB Control and Fan Assembly are 325 Vdc. Isolate at supply before access.
3. Isolate the water circuit and drain the system as necessary. A drain point is located on the heat exchanger manifold at the right hand side of the boiler
(
) to enable the heat exchanger to be drained.
4. Place a tube on the drain point to drain water away from electrics. Turn anticlockwise to open (
).
NOTE: When reassembling always fit new 'O' rings, ensuring their correct location on the spigot.
Green "O"
rings are used for gas joints and Black "O"
rings for water joints.
Use Greasil 4000 (Approved Silicone Grease).
5. After changing a component re-commission the boiler where appropriate and check the inhibitor concentration (see
).
Summary of Contents for Main Heat 12
Page 8: ...Fig 3 Fig 4 Fig 5 Fig 6...
Page 38: ...Example 1 Example 2 Example 3...
Page 40: ...Fig E Fig F...
Page 51: ...Fig 31 Fig 32 Fig 33...
Page 55: ...Fig 35 Fig 36 page 39 12 2 Checking the Combustion 1 Follow the flow chart opposite...
Page 56: ......
Page 63: ...Fig 45 Fig 46...
Page 66: ......
Page 69: ...Fig 55 Fig 56 Fig 57 Fig 58...
Page 72: ...page 52...
Page 74: ...page 54...
Page 75: ...DRY FIRE...
Page 76: ...page 55 IGNITION LOCKOUT...
Page 77: ...page 56 OVERHEAT LOCKOUT...
Page 78: ...page 57 FAN LOCKOUT NOTE The fan is supplied with 325 Vdc...
Page 80: ...warranty This does not affect the customer s statutory rights page 62...
Page 82: ...page 63...
