Dhw Temperature Sensor; Pump Head; Flow Sensor, Flow Restrictor Housing And Filter; Flow Regulator - Worcester GREENSTAR 24i Junior Installation, Commissioning And Servicing Instructions

SERVICE AND SPARES

6.8.20 DHW TEMPERATURE SENSOR

▶ Ensure the domestic hot water circuit is fully drained.
▶ Disconnect the electrical connection from the sensor.
1. Withdraw the spring clip.
2. Withdraw the sensor from the housing.
2.
Fig. 123 DHW temperature sensor
▶ To refit, follow the above in reverse.

6.8.21 PUMP HEAD

▶ Ensure the boiler is fully drained).
▶ Disconnect the electrical connection from the bottom of the pump.
NOTICE: Water damage
▶ Protect the Control unit from water ingress when
removing the Pump head.
1. Remove the four Allen bolts securing the pump at each corner.
2. Gently pull the pump towards you and remove.
Fig. 124 Pump head removal
▶ To refit, follow the above in reverse.
48
1.
1.
1.
2.
1.
1.
6720643895-88.1Wo

6.8.22 FLOW SENSOR, FLOW RESTRICTOR HOUSING AND FILTER

▶ Ensure the domestic hot water circuit is fully drained.
▶ Disconnect the electrical connection to the turbine.
1. Remove the spring clip from the housing and move the brass pipe to
one side.
▶ Remove the wire mesh filter from the free end of the pipe and clean
thoroughly.
▶ Insert the wire mesh filter with the round end first.
2.
Fig. 125 Flow sensor
2. Withdraw the flow sensor and filter from the housing.
▶ Using the cartridge tag, withdraw the flow restrictor housing. If the
regulator housing has become stuck, a pair of long nosed pliers may
be used to grip the housing.
▶ Apply silicone lubricant to the seals to ease assembly.
▶ To refit, follow the above in reverse. Ensure any seals that have been
disturbed are renewed.

6.8.23 FLOW REGULATOR

▶ Remove the flow restrictor housing (See Removing the flow sensor,
flow restrictor housing and filter).
1
Fig. 126 Flow regulator
▶ Using a small Allen key or similar, push the flow restrictor cartridge out
of the housing.
▶ To refit, follow the above in reverse.
▶ Ensure any seals that have been disturbed are renewed.
1 Turbine
2 Flow Restrictor - 24 i = white, 28 i = blue
3 Filters
4 Flow restrictor housing
Table 19 Flow regulator parts
1.
6720643895-90.1Wo
2 3
4
6720643895-91.1Wo
6 720 802 047 (2013/05)