MTA HAST 100 N - User Manual

Questions and Answers

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Henry BarnettAug 9, 2025
Why is my MTA Heat Pump showing a high pressure error?
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  Jenna FaulknerAug 9, 2025
  If your MTA Heat Pump is showing a high pressure error, several factors could be the cause. First, check the fans to ensure they are functioning correctly and rotating in the right direction; repair or replace them if needed, or invert two of the phase wires of the fan power supply. Secondly, prevent warm air from recirculating by repositioning the unit or removing any nearby obstructions. Also, inspect the coil for fouling and clean the condenser fins if necessary. Finally, ensure that the thermal load is within the prescribed limits.
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Jason MaldonadoAug 16, 2025
How to troubleshoot an MTA Heat Pump that fails to start?
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  Susan MorganAug 16, 2025
  If your MTA Heat Pump unit fails to start, there are several possible reasons. First, check for any active shut-down alarms that might be preventing the unit from starting. If the unit is programmed to run by time band, activate start mode outside of those time bands in the User stage. Also, verify that supervision is not enabled by entering the supervision stage and disabling the supervision function. Finally, ensure that remote control is disabled to allow the unit to start.
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suelivingstonAug 31, 2025
Why is there insufficient water pressure at the outlet of the pump in my MTA HAST 100 N?
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  tiffany01Sep 1, 2025
  If there's insufficient pressure head at the outlet of the pump in your MTA Heat Pump, it could be due to a few reasons. If the water flow rate is too high, restore it to within prescribed limits, perhaps by partially closing a pump delivery cock. If there is ice in the evaporator, stop the unit, leave the pump running, edit the set-point value and add ethylene glycol to the water. Also, if the evaporator is blocked, supply a high flow rate of water in countercurrent conditions and install a filter upline from the unit.
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Stacey SmithNov 22, 2025
What to do if the water outlet temperature is higher than set-point in my MTA HAST 100 N?
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  David HaleNov 22, 2025
  If the water outlet temperature of your MTA Heat Pump is higher than the set-point, several issues could be responsible. You can increase the hydraulic circuit pressure drop, for example, by partially closing a pump discharge valve, if the water flow rate is too high. If the thermal load is too high, restore it to within prescribed limits. If the ambient temperature is too high, increase air recirculation. Clean the condenser fins if they are fouled and remove any obstructions from the front surface of the condenser. Invert the position of two of the three phase wires of the power supply if the fan rotation is incorrect. If the circuit has insufficient refrigerant charge, call a qualified refrigeration engineer to check for and eliminate any leaks and have the circuit charged. Finally, if ...