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Evaporator pump 1 control J2A / CH19 PD5-BASE The control can regulate one or two evaporator pumps, and automatically change over
between the two pumps.
Evaporator pump 2 control J2A / CH20 PD5-BASE The control can regulate one or two evaporator pumps, and automatically change over
between the two pumps.
Evaporator heater control J2B / CH21 PD5-BASE This (and the pipe heater for units without pumps) protects the evaporator against frost.
4-way valve A control J2C/ CH22 PD5-BASE The control regulates the 4-way valve during heat/cool changeover or during defrost
cycles.
4-way valve B control J2C/ CH23 PD5-BASE The control regulates the 4-way valve during heat/cool changeover or during defrost
cycles.
Alarm relay output J3 / CH24 PD5-BASE Indicates alarms.
Alert relay output J3 / CH25 PD5-BASE Indicates alerts.
Operation or ready-to-start relay
output
J3 / CH26 PD5-BASE Indicates if the unit is ready to start or operates.
Contact 1:
Start/stop
J4 / CH11 32-33 PD5-BASE This contact is used for unit start/stop. It is only taken into account if the unit is under
remote operation control (rEM).
Contact 2:
Setpoint selection
J4 / CH12 65-66 PD5-BASE This contact is only taken into account if the unit is under remote operation control (rEM).
Contact 3:
Demand limit selection 1
J4 / CH13 63-64 PD5-BASE See the description of these contacts in sections 3.6.5 and 3.6.6.
Contact 3 bis:
Demand limit selection 2
CH9 NRCP2-BASE This contact is only present if the energy management option is used.
User safety loop input J4 / CH15a 34-35 PD5-BASE This contact is mounted in series with the water ow control contact. It can be used for
any customer safety loop that requires that the unit is stopped, if it is open. If it is unused
this contact must be bridged.
Contact 4:
Heating/cooling selection
J5B / CH17 PD5-BASE This contact is used for heating/cooling mode selection. It is only taken into account if the
unit is under remote operation control (rEM).
Contact 5:
Pump operation status
J5C / CH18 PD5-BASE If this contact is open, the pump is controlled and an alarm has tripped.
Connection to CCN J12 PD5-BASE An RS-485 bus is used for connection to the CCN.
- Pin 1: signal +
- Pin 2: ground
- Pin 3: signal -
Critical alarm relay output J2C / CH22 NRCP2-BASE Output allows disconnecting the general unit power supply, if a contactor is stuck and
there is an increased risk of the unit being damaged (available if the energy management
option is used).
3.6.2 - Volt-free contact on/off/cooling/heating without
multiplexing
If the automatic heating/cooling changeover function is
not selected (see section 5.2) and if the user configuration
allows this (heat pump and Pro-Dialog interface selection)
the operation of contacts 1 and 4 is as follows:
Open Closed Closed
- Open Closed
Contact status not signicant
3.6.3 - Volt-free contact on/off/cooling/heating with
multiplexing
If the automatic heating/cooling changeover function is
selected (see section 5.2) and if the user configuration
allows this (heat pump and Pro-Dialog interface selection)
the operation of contacts 1 and 4 is multiplexed:
Open Closed Closed Open
Open Open Closed Closed
NOTE: The automatic changeover function (ON auto)
selects the cooling or heating mode based on the outdoor
temperature (see section 5.2).
3.6.4 - Volt-free setpoint selection
This volt-free contact permits changing the setpoint. The
setpoints can be modified in the setpoint menu.
Open Closed - Open Closed -
3.6.5 - Volt-free demand limit contact with energy
management option
For units with the energy management option the demand
limit contact 3 is located on the PD5-BASE board and
contact 3 bis is on the NRP2-BASE board. Demand limit is
now multiplexed.
Open Closed Open Closed
Open Open Closed Closed
3.6.6 - Volt-free demand limit contact without energy
management option
For units without energy management option, contact 3 is
located on the PD5-BASE board.
Open Closed
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