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SAFETY DEVICES
The units contain various safety devices to avoid damage to the unit due to very low water temperatures.
1.- Anti-freeze protection.
This protection is activated by the control of the unit when the outlet water temperature probe (St2), located inside
the water exchanger, measures +5ºC and deactivates when the outlet water temperature probe reaches to +6ºC
again.
When the protection is activated occurs as follow:
- If the unit is on STAND-BY as the operating mode: the water pump goes on, the same happens with electrical
heater of water exchanger and electrical heater of water tank (if included).
- If the unit is operating on cooling mode: feeds the electrical heater of water tank, the electrical heater of the water
exchanger, and activates the hot gas injection valve (if the unit incorporates these options).
- If the unit is operating on heating mode: feeds the electrical heater of water tank and the electrical heater of the
water exchanger (if the unit incorporates these options).
2.- Low water temperature alarm.
This alarm activates when the outlet water temperature probe (St2) measures a value of +3ºC. As a consequence,
the unit stops
. The alarm could be reset when outlet water temperature reaches +8 ºC.
3.- Compressor start delay.
There is a start to start anti cycle time of 5 minutes between starts compressor starts and a further delay between
compressor stop to start of 5 minutes (maximum number of starts is 12 per hour).
4.- Compressor crankcase heaters.
It is located around the compressor. This protection is activated when the unit is stopped in order to keep the
compressor oil on suitable conditions and to avoid refrigerant condensing inside the compressor.
5.- Water pump start delay.
In both heating and cooling modes the compressors start 4 minutes after the water pump has started in order to
stabilize the water system.
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 WATER PUMP
START DELAY PROTECTION WILL NOT OPERATE.
DO NOT TURN OFF THE POWER TO THE UNIT. WHEN THE POWER IS OFF THE CRANKCASE
HEATER PROTECTION WILL NOT OPERATE.
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