Glycol / water mixtures are required in all systems where the exposes exterior piping inside and outside the unit experience outdoor design temperatures below the freezing point of water. Glycol must have a minimum percentage of 20% glycol mixture to avoid the possibility of algae formation inside the piping system. …
Glycol / water fluid mixtures generally contain inhibitors that protect the inside of the piping system from corrosion caused by electrolysis. As well small dirt or rust particles may be kept in suspension longer until captured by the in-line filter which will reduce maintenance issues. The effective cooling range may …
Each system will require a different amount of glycol due to the varying amounts of circulated fluid as the loop changes in size, the amount of stored water and local weather conditions. The amount of glycol required will be based on a percentage of glycol versus water content in the loop. …
Many brands of glycol products exist across the country which will meet or exceed Aermec’s specifications. You should consider inhibited products, and non toxic products with a long life cycle.
The maximum height difference is a function of pressure contained within the loop and the density of the loop water / glycol mixture. The maximum pressure in the loop is defined by the rested operating pressure of the installed equipment at the bottom of the loop below the chiller. You cannot …
The maximum stored water content is determined by the size of the expansion tank that has been installed. The system an operate with between 4 and 10 liters per kilowatt. If the stored water content is greater than 10 liters per kilowatt a larger expansion tank will be required. Higher …
Compressor thermomagnetic switch. Fan thermomagnetic switch. Pump thermomagnetic switch This warning appears if the contact of the thermomagnetic switch protecting the MTC compressor is opened.
Fan thermomagnetic switch. This warning appears if the contact of the thermomagnetic switch protecting the MTV fan is opened. This code is displayed only if the card is used as a replacement for cards with SW up to version 3.6.
High pressure switch. This warning does NOT indicate the status of the high pressure switch itself, but of the compressor contactor. The high pressure switch acts directly on the compressor contactor. If the card con-trols the switch-on of the compressor, and the contactor is not activated after 3 seconds, this …
Flow switch. Water differential pressure switch. This warning appears with the opening of the contact relating to the flow switch or to the differential pressure switch. This alarm is not detected in the first 40 seconds from when the pump is switched on. The machine goes into lockout when the …
Low pressure switch. This warning appears with the opening of the contact of the low pressure switch (intake on the compressor) BP.
Water freeze. This warning appears when the anti-freeze temperature threshold (installer menu, parameter (6) default: 3°C) of the outlet water is reached. The pre-alarm condition is removed when the outlet water temperature exceeds the setpoint calculated by the card on the basis of an internal algorithm; the anti-freeze alarm is …
High force gas temperature. This warning appears when the force gas temperature (SGP probe) exceeds the threshold set in the parameter. The pre-alarm condition is removed with the factory-set temperature (default 125°C).
No compressor delivery pressure transducer. This warning appears when the compressor delivery transducer is not detected and the machine is set in heat pump mode, or the presence of the DCP is set.
High pressure. This warning appears when the transducer detects a delivery pressure greater than the set threshold (default: 40 bar). The pre-alarm condition is removed with the factory-set pressure (default: 38 bar).
No defrosting probe. This warning appears when the defrosting probe is absent and the machine is set in heat pump mode.
No compressor suction pressure transducer. This warning appears when the compressor suction transducer is absent and the machine is set in heat pump mode.
Low pressure. This warning appears when the compressor delivery transducer detects a suction pressure lower than the factory-set threshold in cool mode (default: 4 bar), or in heat mode (default : 2 bar). The prealarm condition is removed when the suction pressure exceeds the envisaged intervention threshold (default equal to …
Low output. Whenever the machine is powered, the control checks the behavior of the compressor once only, via the output control procedure. This control can be deactivated by means of the dip-switch.
Pump thermomagnetic switch. This warning appears if the contact of the thermomagnetic switch protecting the pump is opened. MTP. This code is displayed only if the card is used as a replacement for cards with SW up to version 3.6.
High pressure capacity control. This warning appears whenever there is a capacity control due to the set threshold being reached. The machine goes into lockout when the maximum number of capacity controls allowed (default 5) is exceeded. With the inverter machine, it also indicates a capacity control due to a …
Low pressure capacity control. This warning appears whenever there is a low pressure capacity control. The machine goes into lockout when the maximum number of capacity controls allowed (default 5) is exceeded.
Discharge temperature capacity control. This warning appears whenever there is a discharge temperature capacity control. The machine goes into lockout when the maximum number of capacity controls allowed (default 5) is exceeded.
Bemf error (chiller inverter) – error in the detection of the back emf. This error is given by the inverter control card and is linked to compressor pickup current problems.
