MTA NGSi 07 - Operation on Call from Temperature Controller with Periodic Activation; Continuous Operation; Pump Proportional Adjustment

TECHNICAL MANUAL
Chapter 9 - User - Control Interface
NGSi 05÷15
19
ENGLISH
EN
The data in this manual are not binding and they can be modified by the manufacturer without notice. Reproduction of this manual is strictly prohibited
9.8.2 Operation on call from temperature controller with periodic activation
The function is disabled if P17=0 (default). If the pump is set into operation on call from the temperature controller (P03=1, default), it is
activated periodically for a time defined by the parameter P17 (in seconds) after a count whose duration can be set by the parameter P16 (in
minutes), activated when the pump is switched off when the temperature control is met.
With flow switch alarm active in automatic reset the pump is however turned on even if the compressor is off.
The periodic function is also interrupted in the case of intervention of the antifreeze regulator that forces the pump activation.
9.8.3 Continuous operation
In this operation mode, which is active if P03=0, the pump is always on. It is powered off only with the unit OFF.
9.8.4 Pump proportional adjustment
The pump speed is varied according to the temperature difference between the exchanger intake water and discharge water, according to the
diagram below, where:
P07: modulating pump maximum speed (%)
P08: modulating pump minimum speed (%)
P09: modulating pump intake/discharge water Delta T set (°C)
P10: Modulating pump Delta (°C)
Temperature controller
Compressor
Pump
Time
Time
Time
Power on delay between
pump and compressor
Power off delay between
compressor and pump