Checking Flue Integrity; Component Access - Worcester 27i System Compact Installation, Commissioning And Servicing Instructions

SERVICE AND SPARES
6.3

CHECKING FLUE INTEGRITY

The integrity of the flue system and performance of the boiler can be
checked via the flue turret sample points.
Flue gas sample point
Air inlet sample point
Table 13 Key to figure 69
2
1
6720643895-67.1Wo
Fig. 69 Flue turret test points
With the boiler case on and the boiler running at maximum output (refer
to section 6.5.1 "Setting the boiler to maximum").
▶ Insert the analyser probe into the air intake sample point.
▶ Ensure that the probe reaches the centre of the air intake, adjust the
cone on the probe so that it seals the sample point and correctly
positions the end of the probe.
▶ Allow the readings to stabilise and check that:
– O is equal to, or greater than 20.6%.
2
– CO is less than 0.2%
2
▶ If the readings are outside these limits then this indicates that there is
a problem with the flue system or combustion circuit, e.g. missing or
dislodged seals.
1
Fig. 70 Flue integrity test
38
1
2
1
2
1
2
6.4

COMPONENT ACCESS

To gain access to the components, remove the outer case:
1. Remove the two screws securing the control panel.
2. Release the two catches.
3. Pull the bottom of the control panel forward and down.
4. Lower the control panel into the service position
5. Undo and remove the two bottom retaining screws.
6. Lift the spring clips on top of the case.
7. Pull the case towards you to remove.
3.
2.
6.
7.
5.
4.
Fig. 71 Component access
Greenstar i System Compact - 6 720 807 726 (2013/05)
1.