Safety Devices - Lennox Climatic 200 Installation Operating & Maintenance Manual

SAFETY DEVICES

These units contain various safety devices, in order to avoid the water reaches low temperatures so it may cause
a damage to the system.
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).
DO NOT TURN OFF THE UNIT, DURING A PERIOD OF TIME WITHOUT USING THE UNIT,
INSTEAD OF THIS SELECT STAND-BY AS THE UNIT'S OPERATING MODE, SO THE UNIT IS
PROTECTED BY THE ANTI-FREEZE SAFETY DEVICE.
- 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.- Anti-freeze 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 temporize.
In order to avoid the motor compressor reaches high temperatures, the control establishes that should lapse a
minimum time of 5 minutes between two starts of the compressor, and the compressor has to be off at least 5
minutes (the maximum number of starts in one hour are 12).
4.- Crank case heater compressor.
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 that the refrigerant goes inside the compressor cabinet.
5.- Water pump start temporize.
When cool or heat mode have been selected as the unit's operating mode, the water pump starts, and compressor
starts 4 minutes later, in order to the water circuit stabilizes.
DO NOT TURN OFF THE UNIT, SO THIS PROTECTION CAN OPERATE.
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