Rev. B 07-2013
13
MTEC.3800.GB-B-1 Operation and maintenance WSA series English
WSA
Water chiller
volt free contacts for remote ON-OFF, summer / winter change over (heat pumps only) and general alarm.
3.1.7 Microprocessors
All units are supplied with microprocessor controls loaded with ACTIVE autoadapthive strategy. The microprocessor controls the following
functions: control of the water temperature, antifreeze protection, compressor timing, compressor automatic starting sequence, alarm reset,
volt free contact for remote general alarm, alarms and operation LED’s. If required (available as an option), the microprocessor can be
configured in order for it to connect to a site BMS system thus enabling remote control and management. The Hidros technical department
can discuss and evaluate, in conjunction with the customer, solutions using MODBUS protocols. The autoadaptive control system ACTIVE
is an advanced strategy that continuously monitors the temperature of the inlet and outlet water thereby determining the variation of the
building thermal load. By then adjusting the outlet water temperature set point the compressor start/stop cycle can be accurately controlled
thus optimizing the heat pump efficiency and maximizing the operational life of the units component’s. Use of ACTIVE auto-adaptive Control
enables the minimum water content to be reduced from the traditional 12-15 l/kw to 5 l/kw. A further benefit of the reduced water requirement
is that units can be used in installations without a buffer tank thereby reducing the space requirements, thermal losses and costs.
3.1.8 Control and protection devices
All units are supplied with the following control and protection devices: Return water temperature sensor installed on the return water line
from the building, antifreeze protection sensor installed on the outlet water temperature, high pressure switch with manual reset, low pres-
sure switch with automatic reset, high pressure safety valve, compressor thermal overload protection, fans thermal overload protection and
flow switch.
3.2.1 Reversible version (HP)
The reversible versions are equipped with a reversible 4-way reversible cycle valve and are suitable for hot water production at tempera-
tures up to 45 °- 50 ° C. They are always supplied with liquid receiver and bi-directional thermostatic valve. The microprocessor is set to
automatic defrost (enabled in harsh environments) and summer/winter commutation.
3.2.2 Condenserless versions (EV)
This version includes a microprocessor control to manage both the compressor timings and alarms. It is designed to operate with refrigerant
R410A but is supplied with a holding charge of nitrogen.
3.2 Other versions
