Worcester CDi Combi N.G Service Booklet page 20

BOILER SERVICE FUNCTIONS - CDI COMBI & SYSTEM BOILER
In order to save as much energy as
possible and to minimise the possibility of
water circulation noise, a low
characteristic should be chosen.
The pump map can be selected within:
• 0 (Pump step adjustable), see service function
1.d (Map pump step (heating))
• 1 (Constant pressure high)
• 2 (Constant pressure middle)
• 3 (Constant pressure low)
• 4 (Proportional pressure high)
• 5 (Proportional pressure low)
The factory setting is:
1.C Pump map (heating) 4 (Proportional pressure
high)
0,6
H
(bar)
1
0,5
0,4
0,3
0,2
0,1
0
0 200 400 600
Fig. 12 Constant pressure
20
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2
3
800 1000 1400 1600
1200
Q
(l/h)
0,6
H
(bar)
0,5
4
0,4
0,3
0,2
0,1
0
0 200 400 600
Fig. 13 Proportional pressure
1-5 Characteristics
H Pressure
Q Water circulation rate
If this parameter is set to 0 then the pump speed
set under function 1.d (Map pump step (heating))
is active.
1.D MAP PUMP STEP (HEATING)
(combi & system only)
This service function corresponds to the pump speed
switch used on conventional heating pumps.
However, the setting is only active if function 1.C (Pump
map (heating)), is set to 0.
The factory setting is:
1.d Map pump step (heating) 7
0,6
H
(bar)
0,5
0,4
0,3
0,2
3
2
0,1
0
0 200 400 600
Fig. 14
Characteristics
2-7 Characteristics
H Pressure
Q Water circulation rate
8 716 115 748 (2009/09)
5
800 1000 1400 1600
1200
Q
(l/h)
7
6
5
4
800 1000 1400 1600
1200
Q
(l/h)
6 720 612 126-45.1O