ESIE13-03
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Part 2. Troubleshooting
3. Symptom based troubleshooting
Page 38
13/05/15
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Version 2.0
Ground source heat pump
Compressor (M1C) frequency
limited - suction pipe super-
heat protection function active.
This protection control acti-
vates when suction superheat
is > 10°C and expansion valve
is fully open (480 pulse). Unit
returns to normal operation
when suction superheat is
< 4°C.
Remark: check the suction
superheat by measuring the
suction temperature (with con-
tact thermometer) before the
compressor and comparing
with the saturated evaporation
temperature.
Activation of the protection
function can be caused by var-
ious reasons, therefore we
recommend to check the fol-
lowing:
• Check
refrigerant
charge.
• Check expansion valve for
correct operation (see
) and check
suction sensor (R3T) (see
• Check the refrigerant
circuit for blockages.
Based on the diagnosis exe-
cute one of the following
actions:
• Correct
the
refrigerant
charge (total charge:
1.8 kg).
• Replace expansion valve
or suction sensor (R3T).
• Remove
detected
blockages from the
refrigerant circuit.
Root cause category: end user
Space heating or domestic hot
water operation is not acti-
vated on the user interface.
Confirm if space heating oper-
ation or domestic hot water
operation is activated on user
interface.
Activate space heating or
domestic hot water operation
on the user interface.
Root cause category: parameter (setting)
Displayed date/time is wrong -
schedules not correctly exe-
cuted.
• Not set date/time after
initial startup.
• No power supply for more
than 48 hours.
Check date/setting and con-
tent of schedules.
Set date/time according to
operation manual instructions.
Displayed date/time is wrong -
schedules not correctly exe-
cuted.
Daylight Saving Time not set
correctly.
Check Daylight Saving Time
settings.
Set Daylight Saving Time
according to operation man-
ual.
Schedules not activated.
Schedules were not con-
firmed (refer to schedule set-
tings).
Check schedules on the user
interface.
Set schedule according to
user reference guide.
Holiday setting active.
Holiday setting is activated in
the user interface.
Check holiday settings.
Set holiday settings correctly.
Backup heater operation disa-
bled.
Setting backup heater opera-
tion mode [4-00] is set to 0
(disable).
Check setting [4-00].
Change setting [4-00] to 1.
Second step (6 kW) of the
backup heater is not allowed.
Setting "enable backup heater
step 2" [4-07] is set to 0 (not
allowed).
Check setting [4-07].
Change setting [4-07] to 1.
Backup heater equilibrium
point was set too low.
Setting "equilibrium tempera-
ture" [5-01] was set too low.
Check setting [5-01].
Change setting [5-01] to 0 or
higher to more quickly allow
backup heater operation.
Root cause category: installation
Brine circuit leakage.
Brine loop not pressure tested.
Pressure test brine loop.
Repair leakage if required.
Brine circuit (partially) blocked.
Obstruction in brine system.
Check brine circuit for block-
ages
Remove possible blockages
and check the brine quality.
Brine circuit (partially) frozen.
Glycol concentration not OK.
• Check brine concentration.
• Check brine freeze up
temperature Tf (setting
A-04).
• Pressure test brine loop to
check for leaks.
Air in the brine system.
Not enough air purged.
•
Check if all air purge valves
are open.
• Check if air purge valves
are installed on all highest
points of the field installed
brine system.
Purge air out of unit and field
supplied brine system.
Possible failures
Root cause
Check
Corrective action
