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Extension board (PA1, PA2)
DIP-switches
The board incorporates 8 DIP-switches numbered from 1 to 8,
with two positions each (ON/OFF), located as indicated in Fig.
43 (SW1).
No. 1: Do not modify the factory-set position.
No. 2 and 3: Inform the control of characteristics during
defrosts (heat pump units only).
Possible positions in other heat pump models:
-
No. 2 ON, No. 3 ON: Indoor fan stopped during defrost
operation (if no other stage is activated).
-
No. 2 ON, No. 3 OFF: Indoor fan functioning during
defrost operation.
-
No. 2 OFF, No. 3 ON: Supplementary electric heating
stage is activated during defrost.
-
No. 2 OFF, No. 3 OFF: Defrost in TEST mode.
Significantly reduces the settings associated with the
defrost.
Remote reset
The RESET operation indicated in the previous sections can be
initiated in two ways:
1.
On the remote thermostat, move the thermostat controls to
the OFF and AUTO positions.
2.
Disconnect the voltage to the unit.
If the unit incorporates the extension board necessary for
the electric heating and a protection trips, the protection
LED incorporated in the thermostat will flash until the unit
is reset.
Stage sequence switch
The electronic control incorporates a stage sequence switch,
which prevents simultaneous energizing of all compressors and
fans when the unit starts up and does not allow all the
components to stop together when the unit is shutdown.
The time between start-up or shutdown for each component is
an internal parameter in the electronic control and can only be
changed using the servicing tools, basic or advanced
(accessory).
30
Fig. 44
Remote reset (38XTZ 011, 014)
IMPORTANT: The unit is supplied with a remote electric
reset which does not allow start-up of the compressor until
the protection devices have been activated. During unit start-
up in cooling as well as after shut-down caused by a trip
protection device, the equipment is reset by placing the
ambient thermostat controls in the position 'OFF' .
CAUTION: Once the operations needing the TEST mode
have been finalized the original configuration should be reset.
Never leave the test configuration on for normal operation.
No. 4: Informs the control of the setting to be observed during
defrost (heat pump units only).
Possible positions:
ON: 30 minutes
OFF: 60 minutes
These values can be changed using the servicing tools (basic or
advanced).
If a change in position is effected with the unit in operation, the
RESET order must be given so that the control can take into
account the new setting when initiating the subsequent defrost.
If RESET is not ordered, the control will continue the current
defrost at the old setting. The new setting will be used for the
next defrost.
ATTENTION: DIP-switches No. 2, 3 and 4 can only be
varied in heat pump models. For cooling only units, the
position of the DIP-switches does not affect the operation.
No. 5: Informs the control of the behaviour to be adopted when
a protection trips.
Possible positions:
ON: Blocked. After a protection has tripped, even though the
protection itself resets, the unit is blocked until the RESET is
effected from the thermostat.
OFF: Automatic reset. It is not necessary to RESET after a
protection has tripped.
NOTE: The RESET operation must be initiated from the
thermostat.
No. 6: Do not modify the factory-set position.
No. 7: Do not modify the factory-set position.
No. 8: Do not modify the factory-set position.
ATTENTION: The DIP-switches must be handled with
the utmost care so that the electronic board is not damaged.
Tools of the appropriate size for these switches must be used.
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