Controller; Main Functions - Astralpool PROHEAT II Serie Manual De Instrucciones

PROHEAT II SERIES · HEAT PUMP AIR/WATER SYSTEM

6. CONTROLLER

6.1.

MAIN FUNCTIONS

The NA8981 regulator is ideal to control air-water heat pumps with on or two compressors. It is
equipped with temperature probes (water input and output, evaporator defrost, compressor
discharge and ambient temperature). It also has safety sensors (high and low pressure switches,
a flow switch to control water flow through the equipment, compressor consumption meter and
internal fan thermal switch).
Its main functions are shown below:
TEMPERATURE DISPLAY AND CONTRILLING: The display shows the water temperature
•
at all times and the user can choose the setpoint between the operating limits. The
settings of the temperature probes can also be displayed.
AUTO DEFROST CONTROLLING: It has an optimized design of logical defrost controlling
•
and can defrost effectively in order to ensure the machine can run normally at low
temperature.
EXHAUST TEMPERATURE PROTECTION: If the discharge temperature of the compressor
•
is too high, the machine will stop and an alarm will appear on the display (A24 or A25).
HIGH AND LOW PRESSURE PROTECTION: The machine is equipped with high and low
•
pressure switches that stop the machine and displays an alarm if either pressure exceeds
its limits (A11, A12, A13 or A14).
DIFFERENT PERIOD OF OPERATION: The regulator has two operating modes: "Heating"
•
and "Schedule programming". In the "Heating" mode, the machine will operate until the
water temperature reaches the setpoint temperature set by the user. In the "Schedule
programming" mode, as many as three machine operating periods can be scheduled
(See STARTING BASIC OPERATION).
PHASE MISSING PROTECTION AND SEQUENCE PROTECTION: When any of the 3 phases
•
supplying the equipment fails or the 3 phases have been connected incorrectly, the
machine will stop and an alarm will appear on the display (A91).
DISPLAY OF COMPRESSOR CONSUMPTION AND PROTECTION VERSUS EXCESS
•
CONSUMPTION: The regulator shows compressor consumption (A) on the screen. If
consumption is excessive, the machine will stop and an alarm will appear on the display
(A93-A94).
• SEQUENTIAL COMPRESSOR START-UP: The regulator starts up the compressors in
sequence to avoid excess peak power use in the line.
• WINTER ANTI-FREEZE PROTECTION: This protection allows the regulator to recirculate
the water by starting up the water treatment pump so the water does not remain in the
frozen pipes (See PROTECTION SYSTEMS).
• TRIP CIRCUIT: The regulator uses this function to protect the machine in the event of
faults affecting the contactors or an error in the supply line.
• EMERGENCY OPERATION FUNCTION: If communication fails in the LCD display, the
machine can operate with the most recently saved settings.
• EMERGENCY STOP: The equipment is prepared with an emergency push-button with a
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