MAINTENANCE AND OPERATING MANUAL
Troubleshooting
HAS T 070÷140
97
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.
UNIT IN HEAT PUMP (“WINTER”) MODE
In the following points troubleshooting procedures are different with respect to summer operating mode. To gain a fuller
understanding of the situation note that:
• the cycle is inverted and the unit now serves to heat the user circuit water
• the condenser and evaporator described in chiller mode swap their roles
PROBLEM SYMPTOM REMEDY
N
Water outlet
temperature
lower than
prescribed
value
• Low evaporation pressure.
• Cold water flow rate.
• Excessively noisy operation of
compressors.
• Difference between BEWIT and BTOWT
lower than 5 °C with both circuits active.
Water flow rate too high
Increase hydraulic circuit pressure drop (for example: by partially
closing a pump discharge valve).
Thermal load too high
Restore thermal load to within prescribed limits.
Fans run in reverse.
Compressors run in reverse.
Circuit has insufficient refrigerant charge.
O
High
pressure
• High temperature difference between
water inlet and outlet.
• Compressors stop.
• icon illuminates.
• General alarm relay trip.
Insufficient water flow. Increase the water flow.
Thermal load too high.
Restore thermal load to within prescribed limits.
SET-POINT calibration too high (beyond the maximum limit).
Change the set-point
P
Low
pressure
• Compressors stop.
• icon illuminates.
• General alarm relay trip.
• Formation of ice on the condenser.
• Fans stopped or reverse rotation
direction.
Circuit has insufficient refrigerant charge
Call in a qualified refrigeration engineer to check for leaks and
eliminate them.
Have the circuit charged by a qualified refrigeration engineer.
Unit position
Unfavourable position for air exchange - recirculation problems.
Change position and modify air recirculation flows
Front surface of the evaporator blocked
Remove the obstruction from the front surface of the evaporator.
Fan incorrect rotation direction
Invert the position of two of the three phase wires of the power
supply.
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