The modules are interconnected by way of a switch that allows the system to be connected to a LAN network if required.
6.7.17.1Back-up module
In a modular system one unit can be defined as the back-up module. In this manner, one of the units configured is considered
as a redundant (spare) unit, and it is started in the case of one of the other units or due to programmed rotation of the units in
the network.
Rotation of the units occurs after a programmable time in hours and it involves first the complete shut-down of the unit that
must be replaced and then start-up of the unit that was previously in stand-by status.
6.7.17.2Overboost
The overboost function involves activation of the unit in stand-by in addition to all the other units in situations when the
regulation temperature is too far from the setpoint.
6.7.18 Supervision
Supervision services (ModBus, Ethernet, SMS, Email) can be configured in the menu.
The menu is accessible only via the service level password.
The function makes it possible to reduce the unit's cooling capacity when required; it can concern the entire unit or a single
circuit and it occurs by stopping or reducing the capacity of one or more compressors. Unloading types are as follows:
• Unloading by high temperature: can be enabled - on the unit:
Having defined an unloading setpoint and differential, if the temperature reading of the probe remains above
the setpoint for an activation time interval, one compressor in each circuit is stopped or its capacity is
controlled, depending on the type of compressor. If the temperature of the probe is lower than or equal to the
unloading setpoint minus the differential, or if its maximum duration has elapsed, the unloading function is
deactivated and the compressors are restarted.
• Unloading by low temperature: can be enabled (heat pump only) - on the unit:
Having defined an unloading setpoint and differential, if the temperature reading of the probe remains below
the setpoint for an activation time interval, one compressor in each circuit is stopped or its capacity is
controlled, depending on the type of compressor. If the temperature of the probe becomes higher than or equal
to the unloading setpoint plus the differential, or if its maximum duration has elapsed, the unloading function
is deactivated and the compressors are restarted.
• Unloading by high pressure: always present - on the circuits:
Having defined an unloading setpoint, differential and time, if the condensing pressure measured on one
circuit is higher than or equal to the setpoint, the unloading function is activated on the circuit and therefore
one compressor is stopped or its capacity is controlled, depending on the type of compressor exclusively on
the circuit in question.
The unloading function is deactivated only if the condensing pressure falls below and remains below the
unloading setpoint for a preset time or if it falls below setpoint - diff.
• Unloading by high pressure in heat pump: can be enabled - on the circuits
Having defined an unloading setpoint, differential and time, if the condensing pressure measured on one
circuit is higher than or equal to the setpoint, the unloading function is activated on the circuit and therefore
one compressor is stopped or its capacity is controlled, depending on the type of compressor exclusively on
the circuit in question.
The unloading function is deactivated only if the condensing pressure falls below and remains below the
unloading setpoint for a preset time or if it falls below setpoint - diff.
• Unloading by low pressure: always present - on the circuits:
Having defined an unloading setpoint, differential and time, if the evaporation pressure measured on one
circuit is lower than or equal to the setpoint, the unloading function is activated on the circuit and therefore
one compressor is stopped or its capacity is controlled, depending on the type of compressor exclusively on
the circuit in question.
The unloading function is deactivated only if the condensing pressure rises and remains above the unloading
setpoint for a preset time or if it rises above setpoint + diff.
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