CTC Union GSi 16, Installation And Maintenance Manual

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114 CTC GSi 16
Current monitor
The heat pump has an integrated current monitor. If the system is fitted with
a current sensor, the property’s main fuses are continuously monitored to
ensure they are not overloaded. If this should happen, electric stages are
disconnected from the heat pump. The heat pump may be restricted where
high heating requirement levels are combined with, for example, single-
phase engine heaters, cookers, washing machines or tumble dryers. This
may result in inadequate heating or DHW temperatures. If the heat pump is
limited, “High current, elpower redu (X A)” appears in text form in the display.
Consult an electrician to determine whether the fuse size is correct or the
three phases in the house are evenly loaded.
Ground loop
Faults can occur in the cooling unit if the ground loop has not been installed
correctly, if it has not been bled sufficiently, if it contains too little antifreeze or
is not designed to an adequate size. Poor or insufficient circulation can result
in the heat pump triggering an alarm in the case of low evaporation. If the
temperature difference between the ingoing and outgoing temperature is too
large, the product triggers an alarm and “Low brine flow” is displayed. The
probable cause is that there is still air in the brine circuit. Bleed thoroughly,
which may in some cases take up to a day. Also check the ground loop.
See also the section entitled “Connecting the brine system”. Reset the Low
evaporation alarm on the display. Where a malfunction repeatedly occurs,
call in a technician to investigate and rectify the fault.
If the text “Low brine temp” is displayed, the ground loop may not be large
enough or there may be a fault with the sensor. Check the brine circuit
temperature in the Operation data menu. If the incoming temperature falls
below -5 °C during operation, call in a technician to inspect the brine circuit.
Air problems
If you hear a rasping sound from the heat pump, check that it is properly
bled. Top up with water where required, so that the correct pressure is
achieved. If this noise recurs, call a technician to check the cause.
Unusual noise when shutting off DHW
In some cases, unusual noises may be produced by the cold water, pipe
work and heat pump due to the jolts which occur when the flow is quickly
interrupted. There is no fault with the product, but the noise may occur
when older types of instant closing mixers are used. More recent types are
often fitted with a soft-closing mechanism. If an unusual sound comes from
hard-closing dishwasher and washing machines, this can be remedied using
a shock arrestor. A shock arrestor can also be an alternative to soft-closing
water taps.
i
Don’t forget that the
radiators may also
need bleeding.