Bosch Worcester Greenstar CDi Compact ErP Series - Gas Pressure and Fan Performance Testing

SERVICE AND SPARES
CDi Compact
ErP
- 6 720 813 276 (2015/07) 43
7.3 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.
Fig. 67 Component access
7.4 Checking the gas inlet pressure
▶ Refer to section 6.5.1 and check that the gas working pressures in
the system conform to the figures shown below:
7.5 Fan pressure test
Before setting the boiler to maximum output for the fan pressure test,
refer to figure 69:
▶ Switch the boiler off.
▶ Remove the combustion air intake pipe (1).
▶ Remove the fan pressure test point cover (2).
▶ Connect the digital manometer pipe (3) to the fan pressure test point
(4).
▶ Replace the combustion air intake pipe.
▶ Switch the boiler on.
▶ Set the boiler to maximum output.
7.5.1 Setting the boiler to maximum
To set the boiler to maximum output, refer to figure 68:
1. With the control panel in the operating position, press and hold the
and buttons together for at least five seconds.
– The chimney sweep symbol (1) will be displayed at the top of the
screen.
– The word Max will flash at the bottom of the screen.
– The boiler will take approximately 30 to 35 seconds to ramp up to
maximum output.
– Allow the boiler to stabilise at maximum output.
▶ Ensure that the fan/gas valve do not modulate.
Fig. 68 Set boiler to maximum
6720646608-29.1Wo
7.
5.
6.
4.
2.
1.
3.
NOTICE: Gas inlet pressure
▶ Do not continue with the other checks if the correct
gas pressure can not be achieved.
Allowed mbar pressure drop
meter/
regulator
across
pipework
boiler inlet across
boiler
gas control
valve
Natural gas
19 - 23 1 18 - 22 1.5 16.5 - 20.5
L.P.G.
32 - 45 2.5 29.5 - 42.5 1.5 28 - 41
mbar range
This test is to determine if the heat cell requires cleaning
or attention.
eco
max
min
2
3
1
04
bar
1
ok
eco
reset
e
max
min
°C
°F
Max
6720646608-45.1Wo
°C
°F
Max
1.
1
≈≈ 5 s5 s