Unit addressing
Unit addressing within the network can be selected by means of the value given to parameter HA and the
For example, if the HA value is 12 and
OFFSET | DIP 1 | DIP 2 | DIP 3 | DIP 4 |
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0 | off | off | off | off |
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16 | off | off | off | ON |
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32 | off | off | ON | off |
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48 | off | off | ON | ON |
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64 | off | ON | off | off |
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80 | off | ON | off | ON |
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96 | off | ON | ON | off |
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112 | off | ON | ON | ON |
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128 | ON | off | off | off |
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144 | ON | off | off | off |
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160 | ON | off | ON | off |
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Unit control
comp | PRG |
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| mute | chillerµ |
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| clear |
| SEL |
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x 100 |
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Display
The display always shows, by default, the return water tem- perature detected by probe B1. This comprises three figures with automatic viewing of a decimal point between
Unit status
Unit status information is indicated by 5 LEDs located on the terminal display, and 2 LEDs (yellow and green) on the base plate.
Led | Flashing | On |
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Comp. (left) | Comp. 1 in demand (Temp.) | Comp. 1 activated |
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Comp. (right) | Comp. 2 in demand (Temp.) | Comp. 2 activated |
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Cool |
| Operating in COOL |
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Heat |
| Operating in HEAT |
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x 100 |
| Value x 100 |
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Keyboard
The terminal keyboard is comprised of four keys: PRG/mute, SEL,
/HEAT and 
/COOL. These keys allow selecting unit
operating mode, monitor its status and set operating param- eters. There are more keys available on the remote terminal version for working ease. Key functions and their variants, when pressed two at a time, are detailed below.
Activation/deactivation of “COOL” function
The COOL function can be activated and deactivated by pressing the COOL key for over 5 seconds. It is impossible to go directly from the HEAT to the COOL mode without previ- ously deactivating the HEAT function.
Activation/deactivation of “HEAT” function
The HEAT function can be activated and deactivated by press- ing the HEAT key for over 5 seconds. It is impossible to go directly from the COOL to the HEAT mode without previously deactivating the COOL function.
Access to “DIRECT” parameters
The DIRECT parameters are accessible to the user and are related to set points and their differentials, to entering and discharge water temperature of the exchanger, to the refrig- erant temperature in the coil and to the compressor and pump operating hours counters. Pressing the SEL key for over 5 seconds displays the code of the first parameter, which is the cool cycle set point. Pressing the
and 
keys moves you through all DIRECT codes available. Pressing SEL once again displays the parameter value of the 
and 
keys. Pressing the PRG key memorizes the new values and exits the procedure. If for over 10 seconds no modification is made, the display begins to flash. If no other key is pressed in 60 seconds, the unit will go back to normal status without changing any parameter.
"DIRECT" | Description | Factory value |
parameter | ||
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r1 | COOL set point | 12°C |
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r2 | COOL cycle differential | 3°K |
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r3 | HEAT set point | 40°K |
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r4 | HEAT cycle differential | 3°K |
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r6 | Water discharge temp. exchanger 1 | Readout °C |
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r7 | Water discharge temp. exchanger 2 | Readout °C |
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r8 | Refrigerant temp. coil 1 | Readout °C |
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r9 | Refrigerant temp. coil 2 | Readout °C |
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c9 | Operating hours compressor 1 | Readout hours x 100 |
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cA | Operating hours compressor 2 | Readout hours x 100 |
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cC | Operating hours water pump | Readout hours x 100 |
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Access to “USER” parameters
The USER parameters are those used by the unit to operate accordingly. These are protected by a password to avoid ac- cess to unauthorized personnel. Pressing the PRG key for over 5 seconds displays 00 flashing. Enter the password (au- thorized personnel) and press SEL. Pressing the 
and 
keys moves you through all USER parameters available. Pressing SEL once again displays the parameter value of the
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