IVT Greenline HT Plus C Assembly, Commissioning And Maintenance Manual page 36

What to do is a fault occurs in the heatpump
Power failure, 3-phase
The heat pump maintains all its settings in case of a power failure. When
the power returns the heat pump automatically starts up according to the
previous settings.
Possible cause: One or two phases to the heat pump are down.
Action: 1. Check that the fuses in the house's distribution box
have not blown.
2. Change the fuse if necessary. If you have miniature
circuit-breakers and these have tripped you reset
them by pushing up the toggle switch.
3. The heat pump automatically returns to the
operating mode once the fault has been rectifi ed.
3-phase incorrect, 3-phase
Possible cause 1: One or two phases to the heat pump are down.
Action: 1. Check that the fuses in the house's distribution
box have not blown.
2. Replace the fuse if necessary. If you have miniature
circuit-breakers and these have tripped you reset
them by pushing up the toggle switch.
3. The heat pump automatically returns to the
operating mode once the fault has been rectifi ed.
Possible cause 2: Phase sequence to the heat pump is incorrect.
(The alarm may only be rectifi ed by an electrician.)
Action: 1. Press the Ackn. button.
2. Switch the phase sequence on the incoming supply.
The heat pump starts automatically once the phase
sequence has been switched.
High Heat transfer fl uid delta T8/T9 (GT8/GT9)
The heat pump gives an alarm when the temperature difference between
the sensors T8 (GT8) and T9 (GT9) is too high.
Possible cause 1: Not enough fl ow over the heat pump.
Action: 1. Check that the heat carrier pump has not jammed.
2. Check that all the valves are open. The thermostat
valves in heating systems should be fully open and in
fl oor heating systems at least half of the coils should
be fully open.
Possible cause 2: The particle fi lter on the hot side is clogged.
Action: 1. Clean the particle fi lter.
If the power does not return on all
phases at the same time during
external electrical work, there is a risk
that the Rego control unit gives a false
alarm for a phase sequence error.
Increase the speed of the heat
carrier pump:
Use a screwdriver or a coin to increase
the speed of the heat carrier pump. Turn
one step anti-clockwise.
36
ALARM
Power failure
080922 16:08:15
Info Ackn.
ALARM
3-phase incorrect
080922 16:08:15
Info Ackn.
Note
ALARM GT8/GT9
High HTF delta
080922 16:08:15
Info Ackn.
Note