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HIGH PRESSURE heating
1. high air temperature (see operating limits)
2. fans do not work, direction of rotation inverted
3. insufficient air flow to coil
4. not CONSTANT flow (for example, if the pumps
are turned off, certain areas of the plant are
excluded or included, other uses are isolated, etc)
5. dirty air filter
6. condensation gas in the cooling circuit o
7. Too much refrigerant
8. Check the trigger point for the manostat and
transducer
9. Manostat/transducer: loose electric
contacts/terminals, wiring cables interrupted
10. Check the manostat or transducer pressure
control point (deposits of oil, dirt, pin blocked
mechanically)
LOW PRESSURE heating
1. low water temperature (see operating limits)
2. insufficient water flow to the exchanger (high
thermal difference between input and output)
3. not CONSTANT flow (for example, if the pumps
are turned off, certain areas of the plant are
excluded or included, other uses are isolated, etc)
4. Dirt water filter / valves open /air bubbles in the
plant
5. dirty exchanger
6. Manostat/transducer: loose electric
contacts/terminals, wiring cables interrupted
7. refrigerant circuit empty, visible leaks of
refrigerant/oil, insufficient charge
8. dryer filter clogged
9. thermostatic device not operating correctly
10. Check the trigger point for the manostat and
transducer
11. Check the manostat or transducer pressure
control point (deposits of oil, dirt, pin blocked
mechanically)
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