IVT Greenline HT Plus C Assembly, Commissioning And Maintenance Manual page 37

High return to the heat pump T9 (GT9)
There is a sensor T9 (GT9) in the heat pump, which for reasons of safety,
stops the compressor if the temperature of the return water from the
radiators becomes too high. The limit lies at approximately 58ºC.
Possible cause 1: The heating setting is too high.
Action: 1. Reduce the temperature setting (Temp. incr. / decr).
Possible cause 2: The hot water temperature is set too high.
Action: 1. An alarm is given in hot water mode. Contact the
installer to adjust the hot water temperature.
Possible cause 3: The valves on the radiators or fl oor heating
system are closed.
(Only applies if a bypass is fi tted.)
Action: 1. Open all valves.
2. Press the Ackn. button.
Possible cause 4: The fl ow across the heat pump is greater than the
fl ow in the heating system.
(Only applies if a bypass is fi tted.)
Action: 1. Reduce the speed of the heat carrier pump or
increase the speed of the main pump in the heating
system.
2. Contact your dealer.
Heat transfer fl uid out max T8 (GT8)
There is a sensor T8 (GT8) in the heat pump, which for reasons of safety,
stops the compressor if the temperature of the water going out to the
radiators becomes 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.
What to do is a fault occurs in the heatpump
The heat pump starts automatically when
the temperature has dropped.
Lower the speed of the heat carrier
pump:
Use a screwdriver or a coin to lower the
speed of the heat carrier pump. Turn one
step clockwise. The lowest speed should
be avoided.
The heat pump starts automatically
when the alarm is reset and the water
temperature has dropped to its normal
value.
37
ALARM (GT9)
High return HP
080922 16:08:15
Info Ackn.
Note
ALARM (GT8)
Heat tran. f out max
080922 16:08:15
Info Ackn.
Note