Worcester GREENSTAR HE combi Series User Manual

6 720 610 576 GB (03.02)
Individual settings
27
6 Individual settings
6.1 Mechanical settings
6.1.1 Checking the size of the expansion vessel
Maximum pressure at maximum CH flow temperature is
2.5 bar. If the pressure is greater than this then fit an
extra expansion vessel. Refer to table 12.
System Capacity – BS7074:1
6.1.2 Setting the central heating flow tempera-
ture
The central heating flow temperature can be set to
between 35˚C and 88˚C.
Limited maximum setting for low-temperature
operation
The temperature control is factory limited to setting E,
giving a maximum flow temperature of 75˚C.
Adjustment of the heating output to the calculated heat
demand is not required by the heating systems regula-
tions.
Removing the maximum setting limit
For heating systems which require higher flow temper-
atures, the maximum setting limit can be removed.
B Lift off the yellow button on the temperature control
with a screwdriver.
Fig. 35
B Rotate yellow button through 180° and replace (dot
facing inwards).
The CH flow temperature is no longer limited.
6.1.3 Changing the heating pump characteristic
The speed of the central heating pump can be altered
on the pump terminal box.
Fig. 36
1 Pump characteristic for switch position 1
2 Pump characteristic for switch position 2
3 Pump characteristic for switch position 3
H Residual delivery pressure
Q Water circulation rate
Expansion Vessel Pressure and System Capacity
Expansion Vessel litres 10
Expansion Vessel
Charge Pressure
bar 0.75
System
pressure
and
capacity
1 bar litres 82
1.5 bar litres 46
Table 12
i
With underfloor heating systems, observe
the maximum permissible flow tempera-
tures.
6 720 610 332-27.1O
Control setting CH flow temperature
1 approx. 35˚C
2 approx. 43˚C
3 approx. 51˚C
4 approx. 59˚C
5 approx. 67˚C
E approx. 75˚C
max approx. 88˚C
Table 13
i
At switch position 1, maximum output is
not delivered if hot water mode is active.
Position 1 must not be used on combi ap-
pliances.
200 400 600 800
1200
14001000 1600
0,7
0
0,6
0,5
0,4
0,3
0,2
0,1
0
(bar)
H
Q
(l/h)
3
2
1
6 720 610 576-23.2O

Worcester GREENSTAR HE combi Series Specifications

General

Brand	Worcester
Model	GREENSTAR HE combi Series
Category	Boiler
Language	English