Danfoss EPU 2370, Instructions Manual, Page: 12 / 48

12 VI.72.M4.02

Danfoss 11/97
BC-HM
Override with ESME
External override is possible with remote
control unit ESME connected to
terminals 4 and 5. The override signal
applies only to relay output R1 and can
only be received by the control when the
function selector is in position
.
Provisional override to normal
temperature
Provisional override to normal
temperature for 2 hours is possible when
an external override unit is used (ESME
connected to terminals 4 and 5 or
external time switch connected to
terminals 3 and 4).
Override can be started by setting the
ESME or time switch function selector
on
for 5-30 seconds and then back to
.
Override can be annulled by setting the
function selector on for at least 5
seconds and then back to
.
External setpoint
Normal temperature can be set
externally with the potentiometer in the
remote control unit (ESME). ESME must
be connected to terminals 4 and 5. It
overrides the normal temperature setting
on the control in P8.0. The setting range
becomes
±
20 K about the middle
temperature setting in P5.3 (approx. 2
Ω
/
degree).
Note! Override or external setpoint
connected to terminals 4 and 5 is not
possible when an external time switch is
connected to terminals 3 and 4.
General frost protection
EPU 2370 has a frost protection function
which ensures that the measured
temperature at the sensors does not fall
below 6°C. If the temperature at one of
the sensors, S1, S2 or S4, is lower than
6°C, relay contacts R1 and R2 become
activated. When all sensor temperatures
are higher than 6°C the relay contacts
return to their initial position, after a
delay of 3 minutes.
In applications 3 and 5 the delay
depends on the setting in P.4.3.
Note: Actual frost protection depends on
the application selected.
It is also possible to protect the system
against frost at any point by connecting
a separate S3 sensor. Frost protection
limits must be set in P3.1 (see digital
settings).