Worcester 6 KW Instruction Manual page 54

SETTINGS
>>> Mixing valve signal
>>> Mixing valve open
>>> Mixing valve close
>> Alarm buzzer
>> General alarm
> Circulation pumps
>> Heating circuit pump G1
>>> Operation alternative
Factory setting
Alternative
Table 124 G1
▶ Select if circulation pump G1 should run continuously or in optimised
operation. The setting applies to G1 of all circuits.
Continuous means that G1 is always in operation during the heating
season.
Automatic means that the circulation pump runs in approx. 10 min,
stands idle for 10 min, and so on, if it is in winter operation and there
has not been any heating demand for 40 min. Automatic operation is
cancelled when heating demand arises or winter operation is
disabled.
G1 stands idle (apart from anti-seizure operation) if it is summer
operation.
>> Heat carrier pump G2
>>> Operation alternative
Factory setting
Alternative
Table 125 G2
▶ Select if heat carrier pump G2 should run continuously or start
automatically when the compressor starts.
The setting applies to all heat pumps' G2. In automatic operation, G2
starts for heat pump 2 when compressor 2 starts.
>>> Pump speed E2x
>>>> Fixed pump speed
Factory setting
Lowest value
Highest value
Table 126 Fixed pump speed
▶ Set desired percentage to maintain a constant pump speed. Auto
means the pump speed will be controlled by the control unit.
>>>> Temperature difference heat transfer fluid when heating
Factory setting
Lowest value
Highest value
Table 127 Temperature difference heat transfer fluid when heating
▶ Specify the temperature difference which the heat pump will aim to
achieve. This is done by regulating the pump speed.
>>>> Temperature difference heat transfer fluid when hot water
Factory setting
Lowest value
Highest value
Table 128 Temperature difference heat transfer fluid when hot water
▶ Specify the temperature difference which the heat pump will aim to
achieve. This is done by regulating the pump speed.
54
Continuous
Continuous/Automatic
Automatic
Continuous/Automatic
Auto
0% (Auto)
100%
7K
3K
15K
7K
3K
15K
>>>> Pump speed at no demand
Factory setting
Lowest value
Highest value
Table 129 Pump speed at no demand
▶ Set pump speed when there is no demand. A low speed is used to
keep the system operating when there is no demand for heat.
>>> Regulator settings
>>>> P constant
Factory setting
Lowest value
Highest value
Table 130 P constant
>>>> I constant
Factory setting
Lowest value
Highest value
Table 131 I constant
>> Collector circuit pump G3
>>> Operation alternative
Factory setting
Alternative
Table 132 G3
▶ Select if collector circuit pump G3 should run simultaneously with the
compressor or continuously.
> Screed drying
Screed drying requires the installation of underfloor
heating coils under the floor tiles. Consult with screed
manufactories for information on maximum
temperatures and time required.
The screed drying function is used to expel humidity from the floor tiles
in newly-built houses. The drying program has the highest priority, i.e.,
all other functions than security functions and additional heat only are
disabled. All circuits contribute to the drying.
Screed drying takes place in three phases:
• Heating phase
• Phase with maximum temperature
• Cooling phase
Heating and cooling are performed stepwise; each step continues for at
least a day. The phase with maximum temperature is considered to be
one step. There are 9 steps with the factory values: Heating phase in 4
steps (25 °C, 30 °C, 35 °C, 40 °C), maximum temperature (45 °C for
four days), cooling phase in 4 steps (40 °C, 35 °C, 30 °C, 25 °C).
It is possible to cancel a running program. On completion of the program,
the heat pump returns to normal operation.
>> Activate
Factory setting
Alternative
Table 133 Activate screed drying
▶ Select Yes if drying should be performed.
There is an opportunity to change the current program step.
>> Remaining time for current step (shown if drying is enabled)
10%
1%
100%
3.0
0.1
30.0
300.0
5.0
600.0
Automatic
Continuous/Automatic
No
Yes/No
6 720 806 768 (2013/02)