Heat Pump Settings - Gebwell T2 Installation, Operation And Maintenance Manual

Heating / cooling lock time:
The lock time between heating and cooling operation.
When summer heating operation is engaged, cooling is
disabled during the reference value set here.
Factory setting: 24h
Menu: Expert → Parameter list
Cooling circuit 1 → 3/11 → 913
Cooling circuit 2 → 3/11 → 1213
SUPPLY WATER SET POINT LIMITS
A lower limit can be determined for the supply water
temperature used for cooling. The limit curve can be
defined by setting two fixed points. In addition, a lower
limit of 5°C is set for the resulting supply water set point.
Supply water min set point/ET 25 °C
This setting defines the lowest permissible supply water
temperature at a mixed outdoor temperature of 25°C.
Factory setting: 18°C
Menu: Expert → Parameter list
Cooling circuit 1 → 5/11 → 923
Cooling circuit 2 → 5/11 → 1223
Supply water min set point/ET 35 °C
This setting defines the lowest permissible supply water
temperature at a mixed outdoor temperature of 35°C.
If an acceptable outdoor temperature value is not
available, the controller will use the setting of parameter
"Supply water min set point/ET 35°C".
Factory setting: 18°C
Menu: Expert → Parameter list
Cooling circuit 1 → 5/11 → 924
Cooling circuit 2 → 5/11 → 1224
ROOM SENSOR EFFECT
If a room temperature sensor is used in the system, the
controller can be defined a room compensation effect.
Room effect:
The more the room temperature is wished to effect the
cooling's supply water temperature, the higher the set
point is determined.
Adjustment range: 0 – 100%
Factory setting: 80%
Menu: Expert → Parameter list
Cooling circuit 1 → 6/11 → 928
Cooling circuit 2 → 6/11 → 1228
v2-7 24052017

13.9 Heat pump settings

CHARGING PUMP'S SPEED LIMITS
The heat pump's charging pump (Q9 / LP) is speed
controlled. When the compressor is running, the pump
operates between the minimum and maximum rotation
figures, keeping the charging temperature difference at the
set point. This function enables the heat pump to work at
the best possible efficiency.
The pump also rotates when the compressor is off, in this
case the controller drives the pump at the minimum
rotation speed. When setting the pump's rotation speed,
the heat pump's model-specific minimum flow must be
taken into account. The charging flow must not be lower
than the heat pump's minimum flow. This may cause
functional failures in the device. Refer to section
Technical specifications for model-specific minimum
flows.
Menu: Expert → Parameter list
Heat pump → 3/23 → 2792 minimum rotation figure
Heat pump → 3/23 → 2793 maximum rotation figure
Pump's minimum rotation figure, 2792:
Permitted adjustment range: 40-70%
Factory setting: 50%
Pump's maximum rotation figure, 2793:
Permitted adjustment range: 70-100%
Factory setting: 100%
NOTE! When reducing the maximum rotation figure, use
a flow meter to check the minimum flow at the charging
line control valve.
RETURN WATER SWITCHING
DIFFERENTIAL
With this set point the values of the heat pump start-up
limits are defined in return water controlled system. By
return water controlled system is meant a facility where
there are no heating accumulator measurements. This
setting does not affect systems, which have heating
accumulator measurements.
The compressor switches on and off according to the
return water temperature (B71) and the return water
temperature switching differential.
•
By increasing the set point, the compressor runs for a
longer operating period in heating mode.
•
By lowering the set point, the compressor runs for a
shorter operating period in heating mode.
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