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USER MANUAL – Release 1.2 of 01/01/2010
Page 137 of 191
Version: 02/03/2010
ENTRY - EXIT FROM HEAT RECOVERY MODE OF THE CIRCUITS CONFIGURED WITH A POWER
STEP
Both on entry and exit from recovery mode, the delay times rC02 and rC03 are not considered and the
recovery valve is activated or deactivated immediately.
ENTRY INTO HEAT RECOVERY MODE OF THE CIRCUITS CONFIGURED WITH MORE THAN ONE
POWER STEP
Circuit n° configured with more than one power step (e.g. circuit configured with 3 compressors). If the
temperature control requests the switch-on of one or more steps and a heat recovery request arrives from
digital input, a power step is inserted on the basis of rotation. The insertion of other steps is prevented for
time rC02. When the time set in Par. rC02= step forced deactivation time has passed, the heat recovery
valve is activated. After the recovery valve has been activated on expiry of the time set in the Par. rC03 =
step forced deactivation time. If temperature control requests, the previously-requested power steps can be
re-activated, after activation of the recovery valve.
EXIT FROM HEAT RECOVERY MODE OF THE CIRCUITS CONFIGURED WITH MORE THAN ONE
POWER STEP
Circuit n° configured with more than one power step (e.g. circuit configured with 3 compressors).
When the time set in the par. rC04= minimum working time in heat recovery mode has passed, the insertion
of other steps is prevented for the time cR02 if the recovery request expires. The recovery valve is
deactivated when the time set in the Par. rC02= step forced deactivation time has passed. After the recovery
valve has been deactivated on expiry of the time set in the Par. rC03 = step forced deactivation time. If
temperature control requests, power steps can be inserted after deactivation of the recovery valve.
ENTRY INTO HEAT RECOVERY MODE OF THE CIRCUITS WITH ALL CIRCUIT POWER STEPS
ACTIVATED
If there is 100% working situation in the circuit n° (e.g. circuit configured with 3 compressors and all 3 on)
with heat recovery request from digital input, a power step is deactivated for time rC02 on the basis of
rotation before activating the relay output configured as recovery valve. When the time set in Par. rC02= step
forced deactivation time has passed, the heat recovery valve is activated. After the recovery valve has been
activated on expiry of the time set in the Par. rC03 = step forced deactivation time. If temperature control
requests, the previously-deactivated power step can be re-activated, after activation of the recovery valve.
EXIT FROM HEAT RECOVERY MODE OF THE CIRCUITS WITH ALL CIRCUIT POWER STEPS
ACTIVATED
When the time set in the par. rC04= minimum working time in heat recovery mode, has passed, if the
recovery request expires and there is 100% working in the circuit n° 1 or n° 2 (e.g. circuit configured with 3
compressors and all 3 on), a power step is deactivated for time rC02, on the basis of rotation before
deactivating the recovery valve. When the time set in Par. rC02 step forced deactivation time has passed,
the recovery valve is deactivated. When the time set in rC03 ) step forced deactivation time after rotation of
the recovery valve has passed, if the temperature control requests, the previously-deactivated power step is
re-activated.
WARNING:
In all circuits with compressors off due to heat adjustment, the recovery valve output is deactivated even if
the heat recovery request from digital input is active.
