Bosch Worcester Greenstar CDi Classic System ErP Series - 6.3 Replacement of Parts

SERVICING AND SPARES
6 720 815 724 (2015/11)42
▶ Measure the gas inlet pressure at the gas valve test point; it should be
a maximum of 2.5mbar less than the pressure at the meter for natural
gas and a maximum of 4mbar less than the pressure at the regulator
for LPG.
4. Set the central heating control to minimum. This will make the boiler
go to minimum power.
5. Measure the CO
2
; it should now be at the figure for minimum output.
▶ If not, use a 4mm Allen key to adjust the min adjustment on the gas
valve until correct.
▶ Return to maximum and re-check the CO
2
.
▶ If correct press and hold down the performance test button for two
seconds; the button will cease to be illuminated and the blue power
indicator will be permanently illuminated.
▶ Remove manometer and re-seal inlet pressure point on gas valve.
▶ Refit anti tamper cover onto the max adjuster.
▶ Replace the brass screw over the min adjuster on the valve.
▶ Re-assemble and refit boiler case.
Fig. 71 Setting the Air/Gas ratio
6.3 Replacement of parts
Removing outer case
1. Remove bottom panel by pulling it forward and off.
2. Loosen but do not remove the 2 screws (A) securing boiler casing at
the bottom of the appliance.
3. Pull upwards to release the clip (B) on top of the boiler.
4. Pull case forward and remove.
Fig. 72 Removing outer case
Gas type
CO
2
setting
maximum
CO
2
setting
minimum
30CDI Classic System
ErP
Natural gas 9.6% ±0.4 9.0% ±0.4
LPG 11.5% ±0.4 10.5% ±0.4
35CDI Classic System
ErP
Natural gas 9.6% ±0.4 9.0% ±0.4
LPG 11.5% ±0.4 10.5% ±0.4
NOTE:
When checking an existing appliance the tolerance is 0.4%.
If checking after cleaning or component replacement or for adjustment
when the reading is outside the tolerance given above, then the
tolerance is 0.2%
CO - less than 200 ppm (0.002 ratio)
Table 33
Inlet pressure
test point
Min
adjust
4mm
Max
adjust
6720647361-48.1Wo
CAUTION: TURN OFF THE GAS SUPPLY AND ISOLATE
THE MAINS SUPPLIES BEFORE STARTING ANY WORK
AND OBSERVE ALL RELEVANT SAFETY PRECAUTIONS.
NOTICE: After replacement of any components always
check for gas tightness where relevant and carry out
functional checks as described in the commissioning
section. Replace any O-rings or gaskets.
A
B
4.
6720647361-27.5Wo
2.
3.
1.