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PCB switches / configuration & alarms:
• This board is fitted out with 2 “SW1” and “SW2” microswitches as well as “JTP” and “JPC” jumpers for the configuration:
- SW1 - 1 Micro-switch:
In “ON” position (factory setting), the circulating pump starts automatically if the outdoor temperature is below 0°C to
prevent the hydraulic circuit from freezing.
Caution: In the “oFF” position, this function is deactivated.
- SW1 - 2 Micro-switch:
The “ON” position (factory setting) activates the “FL” alarm (heat pump water flow rate) at the system.
Caution: For heat pump with electric support heater applications, this micro-switch must be in the “ON”
position.
For heat pump in boiler back-up applications, the micro-switch must be placed in the “OFF” position.
- SW2 - 1 micro-switch:
The “ON” position activates the “Circulating pump speed variation” function.
The function is not available on this version.
The SW2-1 micro-switch is left in “OFF” position (factory setting).
- SW2 - 2 micro-switch:
To select the circulating pump speed variation control algorithm.
SW2-2 in “OFF” position (factory setting) = “PWM” control.
SW2-2 in “ON” position = “0/10V” control.
The function is not available on this version.
- JTP jumper:
E2P input selection.
Must be positioned on “2-3” (factory setting).
- JPC jumper:
Selection of type of circulating pump speed variation signal.
JPC on “1-2” = “PWM” (factory setting).
JPC on “2-3” = “0/10V”.
-Other plugs:
CHK: not to be used
DISP: short circuiting this plug allows operation of CWC2 board by a service remote control even if the power board A3 is not
connected. In this case, alarm E04 (see part 5), which indicates trouble in the communication between A2 and A3 board, does
not occur. This is signaled by power LED flashing.
• Alarms:
- "AL" LED:
- Flashing = Automatic reset heat pump alarm.
- Stays on = Manual reset heat pump alarm.
- "W" LED:
- Off = No water flow.
- Stays on = Water flow.
- Slow flashing = Water flow rate alarm.
(once a second)
- Quick flashing = Water outlet temperature too low alarm.
(twice a second)
- Flickers = TW2 water outlet temperature sensor fault.
-“Power” LED: illuminates when the power is on. Flashes if there is trouble with the EEPROM of the board (and also if short
circuiting “DISP” plug – see before).
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