PROHEAT II SERIES · HEAT PUMP AIR/WATER SYSTEM
6.5.2. PHASE CONTROL
When the 3 phases of the machine are connected incorrectly or a fault is detected in any of the
phases, the machine will stop and the error code "A91" will be displayed.
6.5.3. OVER CURRENT PROTECTION (If 23=0, disable)
Consumption is checked three seconds after the compressor starts up; if the current > F23 for 5
seconds, the machine will stop and error "A93" will be displayed.
6.5.4. WATER FLOW PROTECTION (F46=0, disable)
After 30 seconds with the water pump ON, the flow switch status is checked; If after another 5
seconds the status of the flow switch is OFF, the machine is stopped and display the error code
"A15".
6.5.5.
HIGH PRESSURE PROTECTION
It is a normally closed switch in the controller. The controller checks during 5 seconds the status
of the high pressure switch and it will take another 5 seconds to act. If it is open, the machine
will stop. If at any time, the status of the high pressure switch is closed, the machine will run
automatically. But if within an hour we have 3 alarms of this protection, the system will be
blocked in alarm status and display error code "A12" or "A14". In order to unblock the system,
manual reboot is needed.
6.5.6. LOW PRESSURE PROTECTION
It is a normally closed switch in the controller. During the defrosting and in the first three
minutes after switching on the machine, the status of the low pressure switch is not checked. In
o not check the low pressure signal;
The controller checks during 5 seconds the status of the low pressure switch and it will take
another 5 seconds to act. If it is open, the machine will stop. If at any time, the status of the low
pressure switch is closed, the machine will run automatically. But if within an hour we have 3
alarms of this protection, the system will be blocked in alarm status and display error code "A11"
or "A13". In order to unblock the system, manual reboot is needed.
6.5.7. EXHAUST TEMPERATURE PROTECTION
When exhaust temperature is higher than F45, the machine stops running, and shows the error
code "A24" or "A25". As soon as exhaust temperature drops to (F45-10ºC), the machine will run
again (each compressor works independently).
But if within an hour we have 3 alarms of this protection, the system will be blocked in alarm
status. In order to unblock the system, manual reboot is needed.
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