16
OTHER PROTECTION
Compressor crank case heater
Located around compressors, this protection is activated when the compressor stops, to maintain the compressor
oil temperature preventing the refrigerant diluting into the compressor oil.
3.- Anti-freeze protection
This protection is activated by the control of the unit.
It comes ON when the water outlet temperature probe (ST2), located inside the water interchanger, measures a
certain temperature and RESETS when the water outlet temperature reaches set temperature as the following table
shows:
- If the unit is operating in cooling mode: The power feeds the electrical heater of water tank, the electrical heater
of the water heat exchanger, and activates the hot gas injection valve (if the unit is fitted with these options).
- If the unit is operating in heating mode: The power feeds the electrical heater of water tank and the electrical
heater of the water heat exchanger (if the unit is fitted with these options).
4.- Low water temperature alarm
This alarm activates when the water outlet temperature probe (ST2) measures a certain temperature, the unit
goes off, at table conditions below:
WATER SYSTEM SAFETY DEVICES (included in units with Hydraulic or Hydronic module)
These units contain various safety devices, to protect against system damage.
1.- Flow switch (option for standard unit)
Stop the unit if water flow is under limits. Operating with water flow under limits is completely forbidden.
2.- Water filter (supply loose for standard unit)
The water filter protects the unit against particles getting inside the circuit. The units must be fitted with a water filter.
If the unit is on STAND-BY as the operating mode and the protection is activated: the water pump comes on, along
with electrical heater of evaporator and electrical heater of water tank (if included).
IT IS NECESSARY TO FIT A WATER FILTER IN THE WATER INLET OF THE UNIT
Protection ON
Protection RESET
STANDARD
UNIT (ºC)
UNIT WITH LOW WATER TEMPERATURE KIT (ºC)
0ºC
-5ºC
-10ºC
+5ºC
+6ºC
-2ºC
0ºC
-7ºC
-5ºC
-12ºC
-10ºC
Alarm ON
0ºC
-5ºC
-10ºC
+3ºC
-3ºC
-8ºC
-13ºC
1.- GENERAL CHARACTERISTICS
1.7.- SAFETY DEVICES
DO NOT TURN OFF THE POWER TO THE UNIT. WHEN THE POWER IS OFF THE ANTI FREEZE
PROTECTION WILL NOT OPERATE.
DO NOT TURN OFF THE POWER TO THE UNIT. WHEN THE POWER IS OFF THE CRANK CASE
HEATER PROTECTION WILL NOT OPERATE.
STANDARD
UNIT (ºC)
UNIT WITH LOW WATER TEMPERATURE KIT (ºC)
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