89
4.16 HEAT PUMP STAND ALONE OPERATION
Performed by A2 board -
see presentation § 3.2.4
For the maintenance and commissioning operations, the heat pump can be operated in a “stand-alone”
configuration, without system control, using the specific maintenance remocon (see PART 6) and/or external
voltage free contacts.
The system can be disconnected in two ways:
- Either, with power off, disconnect the system communication line "BUS" from A2 board (connector “SC”).
- Or, by the system control unit, deactivate heat pump control by setting parameter 76 to "0" – see System
control manual.
To operate the heat pump, force the circulating pump (see § 4.12) before initiate an order via the specific
maintenance remote control or the external contacts.
Heat pump control with voltage free external contacts:
Inputs for external contacts are available on A2 (CWC2) board in order to force heat pump operation
(ON / OFF - Heat / cool). These inputs have priority
to the control signals initiated by means of the possible
maintenance remote control.
The state of these inputs is indicated by the lights placed on the board. Set points (heat and cool) must be adjusted
by
the maintenance remote control but for operation and control by contacts, maintenance remote control is not
mandatory.
ON/OFF:
-Closing a contact between “C” and “1” on the terminals block “ON/OFF” makes the unit starts.
Corresponding LED is lighted in green.
-Closing a contact between “C” and “0” on the terminals block “ON/OFF” makes the unit stops.
Corresponding LED is lighted in red.
In case of closing both contacts at the same time, priority is given to “OFF”.
Note: on A2 board in versions 01 & 02, “OFF” input is also active with system control connected.
HEAT / COOL:
-Closing a contact between “C” and “1” on the terminals block “HEAT/COOL” selects “HEAT” mode.
Corresponding LED is lighted in red.
-Closing a contact between “C” and “0” on the terminals block “HEAT/COOL” selects “COOL” mode. Corresponding
LED is lighted in green.
In case of closing both contacts at the same time, priority is given to “HEAT”.
Note: on A2 board in versions 01 & 02, “HEAT” input is also active with system control connected.
A voltage free change-over contact (use in 24 V max.) is available on A2 (CWC2) board for remote heat pump alarm
signaling.
4.17 HEAT PUMP ALARM SIGNAL FOR SYSTEM CONTROL
Performed by A2 board - see presentation § 3.2.4
Heat pump faults coming from the frigorific circuit are classified in 2 categories:
- Manual reset faults:
Memorized by board A2 as soon as they appear and transmitted to the system control. The A2 board alarm light
“AL” comes on steady.
- automatic reset faults:
The A2 board alarm light “AL” flashes as soon as a fault appear. If it lasts longer than 30 minutes, fault is memorized in
board A2 and transmitted to the system control. The alarm light “AL” then remains steady.
The detailed list of faults is indicated in part 5.
To determine the exact nature of the fault, refer to LED1 & LED2 on the power board A3 or connect the specific
maintenance remocon to the heat pump (see Part 6).
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