41
Response 80 / 100 / 120
- Installation
65
FAN UNIT REPLACEMENT
1. Remove the front and sealing panels. Refer to
Frame 48.
2. a.
Undo the single fixing screw on the fan inlet
venturi and slacken the other 2 location
screws.
b.
Undo the 2 screws securing the sensing pipe
to the manifold block.
c.
Slide the fan inlet venturi upward to
disengage and remove the venturi and
sensing pipe assembly.
3. Disengage the fan retention clip and rotate the fan
body to the right to disengage the bayonet
fixing on the fan outlet.
4. Disconnect the electrical leads from the fan.
5. Withdraw the fan.
Note.
Always take care when handling the fan in
order to preserve the balance of the impeller.
6. Fit the new fan, ensuring that:
a.
All seals are correctly refitted.
b.
The sensing pipe is correctly refitted.
c.
The fan is fully engaged.
7. Check the operation of the new fan.
SER
VICING
SERVICING
65A FLOW RESTRICTOR CLEANING / REPLACEMENT (where fitted)
The restrictor is a plastic piece fitted between the
lower and upper cold pipe assemblies.
To access the flow restrictor proceed as follows:
1. Close the cold water inlet valve below the boiler.
2. Open a hot water tap to relieve the pressure in the
expansion vessel and pipework.
3. Drain using the valve nipple.
4. Undo the bulk head fitting shown.
5. Slacken the nut on the other end of the lower cold pipe
assembly.
6. Clean or renew as necessary. Re-assemble in reverse
order.