13
Ground Source Heat Pumps Since 1983
Possible problems during startup
Problem
Cause
Solution
Fuses always blow when the compressor is
being started.
You are using the wrong type of fuse.
Check that the fuse is automatic: C or D/
ceramic fuse: SLOW or with a snail icon.
Temporary connections at the site are
causing an overload on the fuses.
Reduce load.
The ground loop pump does not start.
The regulator may not be getting any
power.
Check the regulator fuse.
The regulator is not authorised to start the
pump.
Check the measured/set values.
The ground loop pump does not circulate
fluid.
The brine pump is rotating in the wrong
direction.
Switch the location of the two phases.
Shut-off valves are in the fill position.
Check that the deaeration and fill valves
are in the ‘closed’ position and that the
intermediate valve is open.
The compressor runs for a little while and
the steam pressure switch goes off.
There may still be air in the ground loop.
Deaerate the ground loop.
There may be a leak in the refrigerant
loop.
Contact the manufacturer.
The fluid level in the ground loop fill
container drops suddenly after startup.
There is a leak in the system (the smell of
ethyl alcohol is strong), there is a leak in
the ground loop or there is still air in the
ground loop.
Check the condition of valves in the
deaeration group on the air lock and the
shaft seal on the ground loop pump and,
if possible, the ground loop extension
joints, or deaerate.
Thermal relays go off when starting.
The compressor or the ground loop pump is
short-circuited or one of the phases is not
activated.
Check electrical connections.
Fuses in the master switchboard of the
building are faulty.
Check and replace fuses as required.
