11
Ground source heat pumps since 1983
2.9. Electricity check list
Check that
• all phases going to the switchboard are in the correct phase sequence
• the fuse size is correct (slow)
2.10. Startup
Before startup, check that:
• the heating system has been connected, filled and deaerated appropriately
• the ground loop has been installed, filled and deaerated appropriately
• electrical connections have been made appropriately and the outdoor sensor (room sensor, optional accessory)
has been installed
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 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.
