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18 CONTROL OF CONDENSING PRESSURE FOR WATER-TO-WATER UNITS
1) Operation with a two-way valve
If municipal wastewater is used to cool the condenser, we
recommend installing the two-way valve so as to be able to set
the condensing pressure to a value that will ensure correct
operation of the unit and save on cooling water.
Set P26 to
„two-way valve‟. The valve will open linearly from P197
to P198 based on the high pressure.
For more details, refer to the instruction manual supplied with the
kit. To obtain high cooling capacity, set P197 and P198 to their
lowest values. To save on water, set P197 and P198 to their
highest values.
These adjustments depend solely on your installation. It is
essential that you ensure the correct operation of your unit.
2) Operation with a three-way valve
We recommend installing our three-way valve kit if our units are
used with cooling towers. This valve will allow you to adjust the
condensing pressure better and thus optimise your unit
‟s
performance. Set P26 to
„three-way valve‟. The valve will open
linearly from P197 to P198 based on the water return
temperature. For more details, refer to the instruction manual
supplied with the kit.
19 RESTRICTION OF OPERATION OF THE MACHINES
B
ASED ON THE OUTDOOR
TEMPERATURE
19.1 Restriction to the minimum air temperature in heating mode
- This parameter can be set to between -25°C and 5°C in 1°C increments.
- Default setting:-10°C if P119
≠ Cooling where P2 = 3 reversible air-to-water and P7 ≠ I
NVERTER
-20°C if P119
≠ Cooling where P2 = 3
reversible air-to-water and P7 = I
NVERTER
This function is disabled if at least one circuit is being defrosted.
The thermodynamic unit shuts off once the outdoor temperature
P225. The auxiliary heaters or the boiler are substituted for the
thermodynamic control stages. The (thermodynamic) unit restarts once the temperature rises to above P225 + 2K.
Display in heating mode and if auxiliary electric heater P22 = No and P111
≠ Boiler:
If a fault occurs:
- Fault stored in memory in case of a mains power failure
- Fault saved in fault memory
- Relay in On position
- Unit fault LED lit steady.
Display in heating mode and if auxiliary electric heater P22 = Yes:
If a fault occurs:
- Fault not stored in memory if a mains power failure occurs
- Fault not saved in memory if a mains power failure occurs
- Fault relay in Off position
- Unit fault LED off.
Display in heating mode and if P111 = Boiler:
If a fault occurs:
- Fault not stored in memory if a mains power failure occurs
- Fault not saved in memory if a mains power failure occurs
- Fault relay in Off position
- Unit fault LED off.
- To disable this function:
- Simply press the
-
button until the maximum value of the parameter appears. Below this value, the following message appears:
- To turn off the function, simply press
Enter
.
- To re-enable it, simply enter a value of between -25°C and +5°C and press
Enter
.
19.2 Restriction to the maximum air temperature in cooling mode
Visible only if P2 = air-to-water or reversible air-to-water and cooling mode
- This parameter can be set to between 35°C and 50°C in 1°C increments.
- Default setting: DISABLED
The unit shuts off once the outdoor temperature
≥ P225.1.
The unit restarts once the temperature rises back to above P225.1- 2K.
P 2 2 5
M I N . A I R T E M P .
I N H E A T I N G M O D E - x x °
M A C H I N E O F F I N H T G M O D E
O U T T E M P . T O O L O W
E L E C A U X C T R L
O U T T E M P . T O O L O W
B O I L E R C O N T R O L
O U T D O O R T E M P . T O O L O W
P 2 2 5
M I N . A I R T E M P .
I N H T G M O D E D I S A B L E D
P 2 2 5 . 1
M A X . A I R T E M P .
I N C L G M O D E + x x °
Summary of Contents for Magister 2 Series
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