Table of Contents
Replacement parts
10.4
Checking the plate heat exchanger
If the DHW output is insufficient:
▶ Check the strainer in the cold water pipe for contamination.
▶ Remove the plate heat exchanger and replace if necessary.
1. Remove the screw.
2. Remove the plate heat exchanger.
Fig. 82 Removing the plate heat exchanger
10.5
Checking the expansion vessel
The expansion vessel must be checked every year.
▶ If necessary, adjust the expansion vessel pre-charge pressure to the
static head of the heating system.
10.6
Adjusting the operating pressure of the heating
system
Display on the pressure gauge
1 bar
Minimum charge pressure (when system is cold)
1 - 1.5 bar
Optimal charge pressure
3 bar
Maximum charge pressure at maximum heating
water temperature must not be exceeded (pressure
relief valve opens).
Table 30
If the indicator is below 1 bar when the system is cold:
▶ Top up the water until the indicator is between 1 bar and 1.5 bar
again.
If pressure is not being maintained:
▶ Check tightness of expansion vessel and heating system.
60
2.
1.
0010005834-002
10.7
Removing the gas valve
▶ Close gas isolator.
▶ Unplug the plug.
▶ Undo the union nut on the top of the gas valve.
▶ Pull off the gas hose and pressure reducer.
▶ Undo the union nut on the bottom of the gas valve.
3.
Fig. 83 Pull of the plug and undo the union nuts
▶ Remove 2 screws and take off gas valve.
1.
Fig. 84 Removing the gas valve
▶ Install the gas valve in reverse order, and check the gas/air ratio.
Worcester 2000 – 6 721 814 551 (2019/09)
2.
1.
4.
0010015948-002
2.
0010015949-001
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