24
Alpha CB24/28 - Component Replacement
8.17 COMBUSTION CHAMBER INSULATION
1.
Gain access to the combustion chamber as described in section 8.1.
2.
The front panel slides out.
3.
To replace the rear and side panels remove the heat exchanger as described in section 8.16. Prise out the top of the rear
insulation panel and lift it up and out of the boiler, then slide out the side insulation panels.
4.
Fit a new panel and re-assemble in reverse order.
5.
Refill and pressurise the system. (Refer to Commissioning, section 5.1).
8.18 PRESSURE GAUGE - Fig. 24
1.
Gain access behind the casing and drain the boiler heating circuit as described in sections 8.1 and 8.2.
2.
Remove the nut securing the pressure gauge sensor and withdraw the sensor.
3.
Depress the two lugs on the pressure gauge and push it out of the control panel.
4.
Fit the new gauge using a new washer on the manifold connection if necessary.
5.
Refill and pressurise the system. (Refer to Commissioning, section 5.1).
Fig. 24
8.19 TEMPERATURE SENSORS - Figs. 20 or 25
Note that both sensors are the same.
1.
Gain access as described in section 8.1 (behind the casing for the DHW sensor or to the combustion chamber for the
primary temperature sensor) and drain (heating circuit for primary sensor or hot water circuit for DHW sensor) as
described in section 8.2.
2.
Primary Sensor - The primary sensor is positioned on the right hand side of the heat exchanger, see Fig. 20. Disconnect
the wiring and unscrew the sensor. Re-assemble in reverse order with a new sensor and sealing washer.
2a. DHW Sensor (N/A to 24X/28X) - Close the mains cold water inlet valve and open the lowest hot water tap to drain the
DHW system. Disconnect the wiring and unscrew the sensor, see Fig 25. Re-assemble in reverse order with a new
sensor, replacing the sealing washer if necessary.
8.20 AUTOMATIC AIR VENT - Fig. 25
1.
Gain access behind the casing and drain the boiler heating circuit as described in sections 8.1 and 8.2.
2.
Unscrew the automatic air vent from the pump outlet. Fit a new one using a new 'O' ring.
3.
Refill and pressurise the system. (Refer to Commissioning, section 5.1).
8.21 PUMP - Refer to Fig. 25
Gain access behind the casing and drain the boiler heating circuit as described in sections 8.1 and 8.2.
Pump head
1.
Remove the four socket head screws securing the pump head to the body. Withdraw the head, remove the wiring cover
and disconnect the wiring.
2.
Connect the wiring to the new head as follows:-
Brown to L, Blue to N, Green/yellow to
.
Ensure the pump is set to maximum (3) and re-assemble in reverse order.
3.
Refill and pressurise the system. (Refer to Commissioning, section 5.1).
Summary of Contents for Alpha CB24
Page 27: ...27 9 1 ILLUSTRATED WIRING DIAGRAM Alpha CB24 28 Wiring Diagrams 9 WIRING DIAGRAMS...
Page 28: ...28 Alpha CB24 28 Wiring Diagrams 9 2 FUNCTIONAL FLOW WIRING DIAGRAM...
Page 30: ...30 Alpha CB24 28 Fault Finding 10 3 DOMESTIC HOT WATER Follow operational sequence...
Page 31: ...31 Alpha CB24 28 Fault Finding 10 4 FAULT FINDING SOLUTIONS A to F...
Page 32: ...32 Alpha CB24 28 Fault Finding 10 5 FAULT FINDING SOLUTION SECTIONS G to L...
Page 35: ...35 Alpha CB24 28...