Danfoss EPU 2370, Instructions Manual, Page: 18 / 48

18 VI.72.M4.02

Danfoss 11/97
BC-HM
P4.0 Actual return temperature at sensor S4
Display of actual return temperature measured by sensor S4.
P4.1 Required return temperature at sensor S4:
±
(20-99)°C
Setting of temperature at which return temperature limitation is to begin. The
limiter can function as max. or min. limiter.
Positive value (+): max. limit
Negative value (-): min. limit
P4.2 Return temperature limiter influence on reference temperature:
±
(0-20)
When return temperature is higher (max. limit) or lower (min. limit) than the set
limit in (P4.1) the reference is increased or reduced.
The value determines the magnitude of the change (amplification) and the sign
determines the direction.
Positive value (+): reference increased
Negative value (-): reference reduced
P4.3 Warm-start delay time: 1 - 899s
Setting of relay R1 delay. R1 is delayed at warm-start after night set-back and at
start after frost protection. (Applications 2, 3, 4 and 5 only.)
P4.4 Neutral zone - Nz: 0 - 9 K
Setting of neutral zone for PI circuit. When the temperature lies within the neutral
zone, the motor receives no pulses.
P5.0 External setpoint - S5: -20 to 119°C
Display of set point set with external potentiometer.
The setpoint applies only to S1 with (PI) control and S2 with (P + PI) control.
P5.3 Middle temperature for external setpoint: 0 - 99°C
Setting of middle temperature - setting range for external potentiometer.
Note: The input to external setpoint has a time constant of 1 minute.
P5.4 Maximum limiter in PI circuit: -20 to 110°C
Setting of highest permissible temperature in PI circuit.