Carrier 30RQ Operation And Maintenance Instructions page 6

Heat pump units
Description
Evaporator pump 1 control
Evaporator pump 2 control
Evaporator heater control
4-way valve A control
4-way valve B control
Alarm relay output
Alert relay output
Operation or ready-to-start relay
output
Contact 1:
Start/stop
Contact 2:
Setpoint selection
Contact 3:
Demand limit selection 1
Contact 3 bis:
Demand limit selection 2
User safety loop input
Contact 4:
Heating/cooling selection
Contact 5:
Pump operation status
Connection to CCN
Critical alarm relay output
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:
OFF
Contact 1 Open
Contact 4 -
Contact status not significant
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:
OFF ON cooling
Contact 1 Open Closed
Contact 4 Open Open
NOTE: The automatic changeover function (ON auto)
selects the cooling or heating mode based on the outdoor
temperature (see section 5.2).
6
Connector/ Terminal Board
channel
J2A / CH19 PD5-BASE
J2A / CH20 PD5-BASE
J2B / CH21 PD5-BASE
J2C/ CH22 PD5-BASE
J2C/ CH23 PD5-BASE
J3 / CH24 PD5-BASE
J3 / CH25 PD5-BASE
J3 / CH26 PD5-BASE
J4 / CH11 32-33 PD5-BASE
J4 / CH12 65-66 PD5-BASE
J4 / CH13 63-64 PD5-BASE
CH9 NRCP2-BASE
J4 / CH15a 34-35 PD5-BASE
J5B / CH17 PD5-BASE
J5C / CH18 PD5-BASE
J12 PD5-BASE
J2C / CH22 NRCP2-BASE
ON cooling ON heating
Closed Closed
Open Closed
ON heating ON auto
Closed Open
Closed Closed
Remarks
The control can regulate one or two evaporator pumps, and automatically change over
between the two pumps.
The control can regulate one or two evaporator pumps, and automatically change over
between the two pumps.
This (and the pipe heater for units without pumps) protects the evaporator against frost.
The control regulates the 4-way valve during heat/cool changeover or during defrost
cycles.
The control regulates the 4-way valve during heat/cool changeover or during defrost
cycles.
Indicates alarms.
Indicates alerts.
Indicates if the unit is ready to start or operates.
This contact is used for unit start/stop. It is only taken into account if the unit is under
remote operation control (rEM).
This contact is only taken into account if the unit is under remote operation control (rEM).
See the description of these contacts in sections 3.6.5 and 3.6.6.
This contact is only present if the energy management option is used.
This contact is mounted in series with the water flow 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.
This contact is used for heating/cooling mode selection. It is only taken into account if the
unit is under remote operation control (rEM).
If this contact is open, the pump is controlled and an alarm has tripped.
An RS-485 bus is used for connection to the CCN.
- Pin 1: signal +
- Pin 2: ground
- Pin 3: signal -
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).
3.6.4 - Volt-free setpoint selection
This volt-free contact permits changing the setpoint. The
setpoints can be modified in the setpoint menu.
Cooling
CSP 1 CSP2
Contact 2 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.
Capacity
100%
Contact 3 Open
Contact 3 bis Open
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.
Capacity
100%
Contact 3 Open
Heating
Auto HSP1 HSP2
- Open Closed
limit 1 limit 2 limit 3
Closed Open Closed
Open Closed Closed
limit 1
Closed
Auto
-