Daikin Altherma EBLQ011CAV3, Руководство по обслуживанию

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1 Troubleshooting
Service manual
26
EBLQ+EDLQ011~W1 + EBLQ+EDLQ011~0W1
+ EK(2)CB EKMB9W1
Daikin Altherma – Monobloc
ESIE18-04 – 2019.02
Possible failure Root cause Check Repair
Compressor guard timer active. Compressor guard timer active.
Once compressor has stopped it
takes 180 seconds before it can
restart. Normal unit operation – no specific
countermeasure required. —
Root cause category: component – electrical
Possible failure Root cause Check Repair
Power cables (U, V, W) incorrectly
connected to compressor. Wrong assembly during repair. Confirm that the U, V, W wiring is
correctly connected. See
"5.2 Wiring diagram" on page 101
for an indication how to connect
correctly.
Correct the U, V, W wiring.
Compressor does not increase frequency
Root cause category: software control
Possible failure Root cause Check Repair
Compressor frequency limited -
high discharge temperature
protection function active. In case the discharge temperature
is higher than 105°C the
compressor frequency will be
reduced. When the discharge
temperature is lower than 105°C
the frequency can increase again. Activation of the protection function
can be caused by various reasons,
therefore we recommend to check
the following:
▪ Check refrigerant charge,
▪ Check expansion valve for
correct operation,
▪ Check suction thermistor,
▪ Check discharge pipe
thermistor.
Based on the diagnosis execute
one of the following actions:
▪ Correct the refrigerant charge,
▪ Replace expansion valve,
▪ Replace suction thermistor,
▪ Replace discharge pipe
thermistor.
Compressor frequency limited -
high pressure protection function
active. In case high pressure is higher
than 38 bar the compressor
frequency will be reduced. When
the pressure drops below 36 bar
the compressor frequency can
increase again. Activation of the protection function
can be caused by various reasons,
therefore we recommend to check
the following:
▪ Check refrigerant pressure
sensor,
▪ Check high pressure side plate
type heat exchanger for good
water flow and heat exchange,
▪ Check the refrigerant charge.
Based on the diagnosis execute
one of the following actions:
▪ Replace refrigerant pressure
sensor,
▪ Optimize the water flow through
the high pressure side plate type
heat exchanger,
▪ Correct the refrigerant charge.
Compressor frequency limited. Inverter control active – target
water leaving temperature (target
sat. high pressure) reached. Check if saturated high pressure
temperature is within range to heat
up the water to the required
temperature. —
Compressor frequency limited -
suction pipe superheat protection
function active. This protection control activates
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 contact
thermometer) before the
compressor and comparing with
the saturated evaporation
temperature.
Activation of the protection function
can be caused by various reasons,
therefore we recommend to check
the following:
▪ Check refrigerant charge,
▪ Check expansion valve for
correct operation,
▪ Check suction thermistor,
▪ Check the refrigerant circuit for
blockages.
Based on the diagnosis execute
one of the following actions:
▪ Correct the refrigerant charge,
▪ Replace expansion valve,
▪ Replace suction thermistor,
▪ Remove detected blockages
from the refrigerant circuit.
Root cause category: installation
Possible failure Root cause Check Repair
PHE condenser (water side)
(partial) blockage. Dirty water (particles). ▪ Check water flow rate registered
by flow sensor,
▪ Check water side plate type
heat exchanger for blockage.
▪ If required replace the water
plate type heat exchanger,
▪ Check the water quality.