To operate correctly, the HWD terminal must be com-
bined with a room thermostat with summer/winter and fan
speed selector functions located in the room being air con-
ditioned
These functions are performed by the PTH2 accessory.
Once summer or winter mode has been selected,
operation of the unit at the speed selected is controlled
exclusively by the room thermostat.
OPERATING MODES HWD
Description of the PTH2 electromechanical control unit
The PTH2 control unit acts as:
1. fan speed selector to select a fan speed from minimum,
medium and maximum. The set value of maximum
speed only can be modified using the potentiometer on
the unit's electronic board
2. summer/winter/fan selector
3. room thermostat
4. ON/OFF switch
5. automatic/manual selector
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HWD
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English 07/13
CHECKING AND STARTING UP THE UNIT
PRELIMINARY CHECKS
- Check the internal unit is correctly positioned and that
electrical and hydraulic connections are correct;
- check that the voltage and frequency are equal to 230V
±10%;
- check that the screws fastening the conductors to the
electrical components have not worked loose;
- check the condensate drain connection;
- check that the outlet is ducted;
- check there is no air in the hydraulic circuit;
- check the hydraulic circuit for tightness.
STARTING
UP
- Start up the unit in the required mode: cooling only or
heating;
- check that the unit is configured in the correct mode;
- start up the unit using the remote control device. Check
all functions;
- check that the absorption of the fan is below the peak
current indicated in the table;
- check correct fan speed calibration in relation to the re-
quirements of the system.
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