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FIGURE 48. PUMP HEAD
18.14 SAFETY PRESSURE RELIEF VALVE
18.14.1 Drain CH circuit. See paragraph 18.11.
18.14.2 Withdraw the clip securing the safety valve.
18.14.3 Undo the safety valve union connection.
18.14.4 Remove and refit new valve.
18.14.5 Refit in reverse order.
18.14.6 Refill boiler. See paragraph 14.5.
18.14.7 Check operation of boiler. See Section 15.
18.15 AUTOMATIC AIR VENT
18.15.1 Drain CH circuit. See paragraph 18.11.
18.15.2 The automatic air vent head is retained in the pump body with a ‘U’ clip.
Remove clip and lift upwards.
18.15.3 Replace and refit in reverse order. Ensure the air vent head ‘O’ ring seal is
in place when refitting and the new ‘O’ ring is fitted to the return pipe top
connection.
18.15.4 Ensure the air vent cap is loose.
18.15.5 Refill the boiler. See paragraph 14.5. Check for leaks around the new air vent
joint.
18.15.6 Check the operation of the boiler. See Section 15.
18.16 DIVERTER VALVE INTERNAL CARTRIDGE
18.16.1 Refer to paragraph 17.5.
18.16.2 Drain the boiler. See paragraph 18.11.
18.16.3 Remove the diverter valve head. See paragraph 18.7.
18.16.4 Unscrew the 2 screws to access the internal cartridge.
18.16.5 Lubricate the new cartridge with silicone grease and replace.
18.16.6 Refit in reverse order.
18.16.7 Refill the boiler. See paragraph 14.5.
18.16.8 Check operation of the boiler. See Section 15.
18.17 DHW PLATE HEAT EXCHANGER
18.17.1 Refer to paragraph 17.5. See Figure 47
18.17.2 Drain the boiler. See paragraph 18.11 and 18.12.
18.17.3 Remove the fan. See paragraph 17.6.
18.17.4 Remove 2 allen screws securing the plate heat exchanger to the housings
enough to remove.
18.17.5 Manoeuvre the plate heat exchanger out through space left by the fan.
18.17.6 Fit the new plate heat exchanger, using the new O-rings supplied.
NOTE:
The mounting pins are offset. See Figure 47.
18.17.7 Refit in reverse order.
18.17.8 Refill the boiler. See paragraph 14.5.
18.17.9 Check operation of the boiler. See Section 15.
18.18 PUMP HEAD/PWM HIGH EFFICIENCY PUMP HEAD
18.18.1 Refer to paragraph 17.5
18.18.2 Drain the boiler. See paragraph 18.11.
18.18.3 Disconnect the electrical lead from the pump.
18.18.4 Remove the 4 allen screws retaining the pump head.
18.18.5 Remove the pump head and refit new.
18.18.6 When fitting the new PMW pump head there is a loose 2 way connector.
18.18.7 Refit in reverse order.
18.18.8 Refill the boiler. Refer to paragraph 14.5
18.18.9 Check operation of the boiler. See Section 15.
18.18.10 If you have replace a standard pump with a new HE pump, as follows
a. Press and hold the K1 & K7 buttons approx 10 second until the LCD
flashes with ‘t 5’.
b. Quickly press and release the RESET (K4) button. The LCD will display
P00.
c. Using the HOT WATER + (K7) button scroll the display to P27.
FIGURE 44. PRESSURE RELIEF VALVE
FIGURE 47. PLATE HEAT EXCHANGER
FIGURE 45. AUTOMATIC AIR VENT
FIGURE 46. DIVERTER CARTRIDGE
CLIP
CLIP
“O” RING
“O” RING
