IVT Rego 5101 Installation Manual page 32

Information/Alarms
5.6.14 Tripped low pressure switch (B)
Function: The compressor is stopped. E21: Additional
heat permitted to start.
Activated when the corresponding category C-alarm has
occurred more than once during the last 120 minutes.
NOTICE: Acknowledgement of pressure
switch alarm without rectifying the fault
results in repeated attempts to start the
compressor. Many start attempts, when
there is no circulation in the refrigerant
circuit, can cause the evaporator to freeze.
At least 24 hours non operation is required
for it to thaw out. It may even be necessary
to replace the evaporator.
B Remedy cause of fault before
acknowledging.
Heat pump: All.
B Check the particle filter and clean if necessary.
B Check the valves.
B Check the collector circuit pressure, vent if
necessary.
B Check the flow over the evaporator.
B Check the pressure switch and its connections.
B Check collector circuit pump G3.
5.6.15 High temperature T8 (B)
High temperature T9 (B)
Function: The compressor is stopped. E21: Additional
heat permitted to start.
Activated when the corresponding category C-alarm has
occurred more than once during the last 120 minutes.
T8 > 65 °C and T9 > 59 °C give alarm. Restart at 57 °C.
Heat pump: All.
B Check the particle filter and clean if necessary.
B Check the valves and pipe installation.
B Check that the sensor shows correct temperature,
compare with resistance table.
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5.6.16 Low temperature T10 (B)
Low temperature T11 (B)
Function: The compressor is stopped. E21: Additional
heat permitted to start.
Activated when the corresponding category C-alarm has
occurred more than once during the last 120 minutes.
Limit values for alarms are set under Settings\Collector
circuit, factory setting -8 °C (
Restart at -5 °C.
Heat pump: All.
B Check the energy source and its temperature.
B Check the collector circuit.
B Check the particle filter and clean if necessary.
B Check the valves and any distributors.
B Check that the sensor shows correct temperature,
compare with resistance table.
5.6.17 Communication error with E2x (B)
Function: E21 has lost contact with the stated heat
pump.
Heat pump: E21.
B Check the setting for the number of heat pumps
( Table 31, page 11).
B Check the addressing in the stated heat pump
( Table 31, page 11), and the connections between
E21 and the stated heat pump.
B Check the communication cable regarding laying (at
least 100 mm distance to power cables) and any
damage.
B Terminate communication cable at each end as
necessary (use a resistor of 120 Ω, 0.5 W).
5.6.18 Communication error with E21 (B)
Function: The heat pump has lost contact with E21.
Heat pump: All except E21.
B Check that the communication in E21 and the relevant
heat pump is working.
B Check the addressing in the stated heat pump
( Table 31, page 11), and the connections between
E21 and the stated heat pump.
B Check the communication cable regarding laying (at
least 100 mm distance to power cables) and any
damage.
B Terminate communication cable at each end as
necessary (use a resistor of 120 Ω, 0.5 W).
Table 39, page 25).
6 720 645 172 (2010/07) en