FläktGroup ReCooler HP Generation 5 Installation and Maintenance Manual
- Category
- Split-system air conditioners
- Type
- Installation and Maintenance Manual
Content Page
1. Safety 2
2. Product description 3
– General information 3
– Overview 3
3. Lifting and transport 5
4. Installation and jointing 5
5. Assembly instructions for split casing 10
6. Commissioning 11
7. Maintenance 16
8. Description of the functions 17
9. Alarm handling and troubleshooting 18
10. eQ with other AHU controller than FläktGroup 22
ReCOOLER® HP
INSTALLATION AND COMMISSIONING
FläktGroup DC_10689GB 20220705_R1 Specifications are subject to change without further notice
ReCooler HP - Installation and commissioning
2
FläktGroup DC_10689GB 20220705_R1 Specifications are subject to change without further notice
1. SAFETY
Important!
– The unit must NOT be used for purposes
other than as a reversible heat pump unit.
– The unit’s Installation and Commissioning
Instructions must be studied carefully
before starting/operating/servicing/
maintaining/scrapping the unit.
Keep these instructions in a safe place
for future reference!
– All service and maintenance must be
carried out by certified personnel.
Service/maintenance of the refrigerant
system must only be carried out by an
accredited company and certified
personnel wearing required protective
equipment (gloves and protective eye-
glasses).
– Follow local legislation regarding use of
and inspection of pressure equipment.
– Lock and tag the heat pump prior to
performing service on the unit.
– Do NOT stand on the heat-pump unit!
– Use only genuine spare parts for
maintenance!
– Installation of units with split casing is
to be performed only by certified refri-
gerant technicians.
Failure to comply with above terms and conditions can
result in serious injury and will void the warranty.
ReCooler HP - Installation and commissioning 3
FläktGroup DC_10689GB 20220705_R1 Specifications are subject to change without further notice
GENERAL INFORMATION
ReCooler HP is a module with rotary heat exchanger and rever-
sible heat pump included in the FläktGroup AHU range eQ.
ReCooler HP can be used in the modular range ”eQ Master”
and compact range ”eQ Prime”. This manual mainly focuses on
2. PRODUCT DESCRIPTION
eQ Master, but most of the information is applicable to eQ Prime
and will give detailed info compared to the general eQ Prime
manuals.
Hydrophilic
coated coils.
Splitable unit available
for easy installation.
Twin electronic expansion
valves for accurate and
efficient control.
Smart software developed
by FläktGroup for optimal
operation and energy savings.
Modbus communication.
High performance and
durable eQ Casing.
RegAsorp total energy
rotary heat exchanger offers
maximum heat and cooling
recovery.
Reversible heat pump function
offers cooling and heating in
sequence with the energy
recovery.
All refrigerant
equipment is
housed within
the casing but
not in airstream.
R410A refrige-
rant offers high
efficiency and
compact design.
High efficiency
PM motor driven,
variable speed
scroll compressor.
PRODUCT OVERVIEW
ReCooler HP - Installation and commissioning
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FläktGroup DC_10689GB 20220705_R1 Specifications are subject to change without further notice
TECHNICAL DATA
The charge is the same for eQ Master and eQ Prime but in eQ Prime there is only one common supply and the ReCooler gets the power from the AHU. Refrigerant charge
could be changed without notice. See EQKR data lable on delivered unit.
REFRIGERATION SYSTEM
The Reversible Heat-pump unit in the ReCooler HP is designed
at the following external air temperatures:
• For cooling from +15 °C to +40 °C
• For heating from +15 °C to -22 °C.
The ReCooler HP is also designed for extract air temperatures of
+15 to +28 °C.
ROTARY HEAT EXCHANGER
The rotor unit in the ReCooler HP is designed to recover heat energy
from the extract air. It operates in sequence with
the reversible heat pump unit to heat and cool the air using
as little electrical power as possible.
INTEGRATED ELECTRICAL HEATER
The integrated electrical heater is used to increase supply tempera-
ture at low external air temperatures and during defrost.
The electrical heater includes two thermal protectors:
• An auto reset
• A manual reset
eQ
size
3x400 VAC
Operating current (A)
(without electrical
heater)
3x400 VAC
Operating current (A)
(with electrical
heater)
Refrigerant charge EQKR version 5
Oil/Circuit
(l)
Circuit 1 Circuit 2 Total
kg R410A ton CO2ekg R410A ton CO2ekg R410A
8 15.8 21.9 2.8 5.8 2.8 1.0
11 15.8 24.1 3.7 7.7 3.7 1.0
18 18.5 31.3 7.0 14.6 7.0 2.0
23 18.5 35.6 10.5 21.9 10.5 2.5
32 34.0 50.6 11.5 24.0 11.5 3.1
41 34.0 57.1 14.8 30.9 14.8 3.6
50 36.9 71.2 10.2 21.3 10.9 22.8 21.1 3.0
72 67.9 106.9 11.0 23.0 12.0 25.1 23.0 3.1
ReCooler HP - Installation and commissioning 5
FläktGroup DC_10689GB 20220705_R1 Specifications are subject to change without further notice
3. LIFTING AND TRANSPORT
eQ size Weight (kg)
Non split version
Weight (kg)
Split version
008 500 522
011 570 700
018 680 763
023 900 909
032 990 1100
041 1230
050 1440
072 1590
Total weight (including casing and base frame).
L
L
L
L
Because of its design, the centre of gravity is offset towards
the inspection side. This must be taken into account when
lifting the unit. The unit should first be lifted slightly, and then
inspected to ascertain that it does not tilt or appear unstable
before being lifted higher.
The unit can be lifted usings its eye bolts if its weight does
not exceed 1.050 kg. If the unit weighs more than 1.050 kg,
it must be lifted by a forklift truck from below using the
specified holes. Lifting by any other means can cause the
unit to tip over due to the offset centre of gravity.
Important!
The unit’s centre of gravity is not in
the middle of the unit.
Take care when lifting.
WEIGHT
4. INSTALLATION AND JOINTING
REQUIREMENTS RELATED TO THE FLOOR
The floor must be level. This is to avoid torsional forces and
stresses which could damage the internal pipework in the re-
frigerant circuit. The base frame or thermal wheel must not be
removed.
REQUIREMENTS RELATED TO PLACEMENT
The unit must be installed in such a way that allows service in
accordance with this service manual.
INSTALLATION WITH ADDITIONAL EQEE/EQDE - COIL
(AIR HEATER FOR HOT WATER)
The coil should be designed for temperature lift from 0 °C up to
requested air supply temperature. (water/liquid flow must be
sufficient in defrost mode).
The coil should be provided with its own circulation pump. Hot
water from heat source must always be available at the heating
coil. More information about air heater for hot water is available in
document 8638GB.
DRAIN CONNECTIONS
The ReCooler HP has 2 drain connections (one for each coil). Both
must be connected to the drain with water traps. FläktGroup can
supply water trap with the AHU delivery, ordering code EQAZ-08.
If installed outdoors in cold climate the drains should be fitted with
heating cables for frost protection.
Heat source Heating coil
200 mm
ReCooler HP - Installation and commissioning
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FläktGroup DC_10689GB 20220705_R1 Specifications are subject to change without further notice
LOCATION OF DRAIN CONNECTIONS
= Supply air
eQ size 008-032
eQ size A (mm) B (mm)
008 325 781
011 325 881
018 325 981
023 350 1131
032 350 1231
Inspection side: right
Inspection side: left
Inspection side: left
Inspection side: right
180 mm
230 mm
A
B
180 mm
230 mm
B
A
ReCooler HP - Installation and commissioning 7
FläktGroup DC_10689GB 20220705_R1 Specifications are subject to change without further notice
eQ size 041-072
eQ size A (mm)
041 1280
050 1430
072 1580
Inspection side: right
Inspection side: left
A
350 mm
350 mm
230 mm
ReCooler HP - Installation and commissioning
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FläktGroup DC_10689GB 20220705_R1 Specifications are subject to change without further notice
eQ size 041-072, continued
Inspection side: left
eQ size A (mm)
041 1280
050 1430
072 1580
Inspection side: right
A
350 mm
350 mm
230 mm
ReCooler HP - Installation and commissioning 9
FläktGroup DC_10689GB 20220705_R1 Specifications are subject to change without further notice
JOINTING – EXTERNALLY
JOINTING – INTERNALLY
AC
B
D
A
B, D
C
JOINTING
ReCooler HP - Installation and commissioning
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FläktGroup DC_10689GB 20220705_R1 Specifications are subject to change without further notice
The unit is tested at the factory and supplied with refrigerant
and closed valves (2). Most of the refrigerant is collected in the
large section and a small amount into the small section.
Other work required to disconnect large and small section
can be done by a ventilation installer.
Description for splitting of refrigerant circuit:
1. Remove the front panel on the small section of the Re-
cooler HP.
2. Remove the refrigerant from the small section with
recovery unit into a service cylinder using schrader
valve (1) (located under the ceiling in large section).
Use digital scale to weigh removed refrigerant amount
from the system.
3. Open the flare connectors (3) (located near the joint
between sections) and cover them.
4. The unit can now be split in two sections.
5. When the sections are assembled again, connect the
flare connectors.
6. Perform a leakage test of the flare connectors.
7. Evacuate the small section by using the schrader valve.
The pressure after evacuation shall be under 2 mbar.
8. Open the closed valves (2) (located under the ceiling in
large section).
9. Charge the circuit with refrigerant removed from the
small section.
10. The unit is ready to run.
NOTE: If the unit is not to be split, just open the closed valves (2)!
Important!
Please note that the work on the refrigerant
circuit must be done by a certified refrigeration
engineer according to description.
In accordance with F-GAS regulation 517/2014
(or later editions to that regulation).
CHECK THE POSITION ON THE SHUT-OFF VALVE
Fully closed Fully open
5. ASSEMBLY INSTRUCTIONS FOR SPLIT CASING SIZE 008–032
ReCooler HP - Installation and commissioning 11
FläktGroup DC_10689GB 20220705_R1 Specifications are subject to change without further notice
6. COMMISSIONING
MAIN CONTROL COMPONENTS
A separate controller is installed in the service section of the
ReCooler HP and includes the following components:
– Main electrical panel disconnect switch
– Miniature circuit breaker
– Control unit with display
The controller is separate from the FläktGroup AHU control-
ler and is a microprocessor-based, programmable electronic
version.
MINIATURE CIRCUIT BREAKER
Electrical switch designed to protect an electrical circuit from
damage caused by overload or short circuit.
MAIN ELECTRICAL PANEL DISCONNECT SWITCH
The disconnect switch is used to turn on/off power to the Re-
Cooler heat pump unit. If the ReCooler HP is included in an
eQ Prime with FläktGroup controller the disconnect switch
is combined for ReCooler HP and AHU. For eQ Master with
FläktGroup controller it is different switches for AHU part and
ReCooler HP.
Always lock and tag the unit prior to performing any mainte-
nance or servicing work.
TO SET THE SETPOINT FOR COOLING AND HEATING
The capacity of the ReCooler HP module is dependent on the
need for cooling or heating of the supply air. The temperature
set point that drives the capacity is defined by air handling
unit control, either via Modbus ISYteq 4.0 or via analog signals
(0-10 V and potential free contacts) for other AHU controllers
than FläktGroup.
Important!
Check list
– Always read the safety work on the unit,
on page 2 before beginning work on
the unit.
– The air handling unit must not be com-
missioned until the installation has been
inspected according to the check list
below!
Before commissioning check the following:
– Condition on delivery - no transport
damage, installation site, (adequate
lighting, mounting surface etc.).
– No leakage of compressor oil.
– Proper connection of the supply power.
– Control signal.
– Energy recovery not disabled.
– Condensate drainage and water traps.
installation report submitted:
– There are no loose cables.
– Installation of units with split casing to
be carried out by a certified refrigerant
technician.
After commissioning check the following:
– Outdoor/supply air temperature.
– Condensing/evaporating temperature.
– Discharge gas temperature/subcooling/
superheating.
– Operating currents.
– Brief the operators of the unit.
– Complete the commissioning report
Warning!
The circuit breaker does NOT isolate
the power supply to the entire cooling unit!
Therefore always open and lock the main
switch before you begin any work on
the cooling unit.
eQ size Min. Design airflow
m3/s m3/h
008 0.4 1440
011 0.5 1800
018 0.9 3240
023 1.0 3600
032 1.5 5400
041 2.0 7200
050 2.5 9000
072 3.5 12600
MINIMUM DESIGN AIR FLOW RATE IN ACON
ReCooler HP - Installation and commissioning
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FläktGroup DC_10689GB 20220705_R1 Specifications are subject to change without further notice
eQ size Min. Design airflow
m3/s m3/h
008 0.24 864
011 0.36 1296
018 0.54 1944
023 0.69 2484
032 0.96 3456
041 1.00 3600
050 1.20 4320
072 1.50 5400
Min. air flows through the ReCooler HP are valid with:
1. Balanced air flows (supply/exhaust), large variation are not
allowed. Exhaust air flow must be higher, equal or max 20 %
lower than supply air flow.
2. AHU fans operation limits (min. airflow and pressure).
3. With low air flow rate at turn down, the outdoor temperature
range can be limited due to compressor envelope.
The ReCooler HP controller includes a protection that prevents
start of the compressor if the air flow of the eQ AHU is below the
minimum stated above.
MINIMUM AIR FLOW RATE AT TURN-DOWN
OPERATING MODE
Two operating modes are available: Economy and Comfort
mode.
Economy mode
In economy mode we prioritise energy recovery so the rotor is
operating at full speed while the compressor is operating in on-
off mode when there is a small heating demand. This means
there will be temperature variations in the supply air.
Comfort mode
In comfort mode we prioritise a constant supply air temperature
so when the heating demand is small we reduce the speed of
the rotor so that the compressor can run continuously.
DEFROSTING
The ReCooler HP is equipped with a defrost system that uses
the pressure drop over the coils to decide if there is frost in the
extract coil. On detection of frost in the exhaust coil the circuit
is reversed to heat the extract coil. The rotor speed is reduced
and the electric heater in the supply side is started if present in
the unit.
Defrosting will run for a minimum time or as long as it takes to
reach a set condensing temperature. When those conditions
are met the unit reverts to normal operation by first reducing
the speed of the compressor and then reversing the circuit
followed by a return to the required compressor speed accor-
ding to the temperature control signal.
If there is a reheater in the AHU, it can be activated during
the defrost operation. Defrost operation can be detected on
terminals C1/NO1 if that has been selected in the Carel HMI by
means of the set up wizard. Those terminals can alternatively
be used as an alarm signal for the rotor.
RETURN AIR SECTION
The eQ air handling unit can be equipped with both a ReCooler
HP and a return air section for night heating. The AHU must
in this case be equpped with a separate reheater, since the
ReCooler HP shall be out of operation when the return air
damper is opened.
It is not possible to use ReCooler HP with mixing section where
extract and outdoor air is mixed.
ALARM
All the alarms are indicated on the display of the Carel control
unit. A global alarm is available on the terminal block from a
potential-free relay (normally open) (terminals 900, 901).
Most alarms are automatically reset 5 times within a 24 hour
period. If additional alarms are generated then a manual reset
will be necessary. To restart the unit in this case press the
alarm button on the Carel HMI for 5 seconds.
The controller in the unit checks that the correct mass of refrige-
rant is present in the circuit. A warning is issued from the control-
ler if the refrigerant quantity falls below the minimum limit.
Qualified refrigeration personnel can check the circuit opera-
tion by means of the data given in the controller HMI.
See page 16 of document for complete alarm list.
ReCooler HP - Installation and commissioning 13
FläktGroup DC_10689GB 20220705_R1 Specifications are subject to change without further notice
PGD1 INSTRUCTIONS
The ENTER button is used to scroll through the list of
available languages and the ESC button is used to
confirm the users selection.
The home screen shows the following information:
– Circuit that the display is connected to
– Operating mode (Cooling/Heating)
Status:
– Standby
– Start phase
– Unit running
– Start delay
– Defrost
– Alarm
& etc.
The current example shows:
– Compressor speed demand sent from external
control system: 75 %
– Current rotation speed of the compressor: 35 %
– Current speed of Rotary Heat Exchanger: 100 %
This screen displays information related to the current
status (operating mode) of the coils (condensing /
evaporating ), position of the expansion valves and
whether the AHU is configured with supply air in the
upper or lower deck.
Temperature and pressure values.
Alarm button
Button for service mode
Esc Button
Button up
Enter button
Button down
HMI – DISPLAY
–+
Supply
FläktGroup
ReCooler HP - Installation and commissioning
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FläktGroup DC_10689GB 20220705_R1 Specifications are subject to change without further notice
Super-heat and sub-cooling.
Access to additional basic configuration settings.
Used to select the heat pump control method
(Analog/Modbus).
Analog - Third party.
Modbus - FläktGroup controls (ISYteq 4.0).
Activating quick start will bypass the normal
compressor start up sequence.
Valid for two and three circuits only.
ReCooler HP - Installation and commissioning 15
FläktGroup DC_10689GB 20220705_R1 Specifications are subject to change without further notice
Comfort mode
1. At start-up, the rotating heat exchanger speed will
be reduced when the demand compressor
speed is less than the actual compressor speed.
2. With low demand and the compressor at its lowest
speed, the rotating heat exchanger will reduce speed.
Economy mode
When the unit is running in economy mode, the rotating
heat exchanger is always first in the heating sequence and
only begins to decelerate when the compressor is off.
Software information of the system.
ReCooler HP - Installation and commissioning
16
FläktGroup DC_10689GB 20220705_R1 Specifications are subject to change without further notice
COMPULSORY DECLARATION AND RECURRING INSPECTION
Compulsory declaration
The function of this product relies on the refrigerant R410A; which is
a fluorinated greenhouse gas.
The European Union is committed to reducing emissions of such
gases. Ensure that you are fully aware of your local regulations and
that they are complied with.
R410A has an equivalent mass of CO
2
of 2088 according to F-GAS
Regulation 517/2014. Global Warming Potential, GWP is 2088.
According to the F-Gas Regulation, ReCooler HP must be leak
tested once every 12 months. This is the responsibility of the end
user/operator. With a leakage detection system the frequency of
leak checks is 24 months.
Production of the ReCooler HP is carried out in accordance with
Commission Regulation 517/2014 and Standards EN 378 and EN
60335-2-40.
The ReCooler HP is an equipment in which all fluorinated green-
house gas containing parts are made tight by welding, brazing or a
similar permanent connection including capped valves and capped
service ports that allow proper repair or disposal.
Any service or repair work must be carried out by an authorised
person with the necessary training and certification in accord-
ance with the F-Gas Regulation and this instruction.
DUTY OF NOTIFICATION AND IN-SERVICE INSPECTION
Duty of notification
If the installation contains fluorinated greenhouse gases in qu-
antities of 14 tonnes of CO
2
equivalent or more the supervisory
authorities, generally the environmental health department, must
be informed. This information must be provided well in advance of
installation. For more information see local refrigeration legislation.
INSPECTION/MAINTENANCE
Regular inspection and maintenace in accordance with legi-
slation in force must be carried out by a certified refrigeration technician.
INSPECTION
To be carried out by the owner/user once a week.
Check the following:
1. Indicated alarms
2. Abnormal noise/vibrations
3. Leakage
4. Corrosion, wear and tear
5. The interior of the unit, light fittings
MAINTENANCE
Check the following:
1. Electrical equipment
2. Coils, drip tray and the drainage system
3. Air filter-s on compressor cabinet
RECURRING CHECKS
Must only be carried out by a certified refrigeration technician.
Inspect the system at least once every 12 months and maintain
a journal. This is the responsibility of the end user/operator. With
a leakage detection system the frequency of leak checks is 24
months. Follow local legislation regarding use of and inspection of
pressure equipment.
Check the following wherever applicable:
1. Piping and refrigerant components
2. Inspection to detect refrigerant leakage
3. Check for abnormal vibrations
4. Check to detect possible corrosion
5. Whether filling with additional refrigerant is needed
6. Check to detect possible oil leakage
7. Safety equipment
8. Connection joints/Seals
Important!
Always read the safety directions on page 2
prior to beginning any work!
7. MAINTENANCE
Leak testing minimum frequency
ReCooler HP
size
Without
Refrigerant charge detector
With
Refrigerant charge detector
81 test/12 months 1 test/24 months
11 1 test/12 months 1 test/24 months
18 1 test/12 months 1 test/24 months
23 1 test/12 months 1 test/24 months
32 1 test/12 months 1 test/24 months
41 1 test/12 months 1 test/24 months
50 1 test/12 months 1 test/24 months
72 1 test/12 months 1 test/24 months
Intake air hood with filter is located outside on lower deck of
compressor cabinet. To change the filter, pull back the filter
hood, insert new filter and put it back. Check filter inside in each
3 months. Filter is reusable and can be washed or vacuumed.
Otherwise order new one (AMIE-2598869) box with 3 new filters. If
filter is not clean ventilation in compressor cabinet can be reduced.
It will cause overheating of components and possible alarms from
speed drive.
AIR FILTER-S ON COMPRESSOR CABINET
ReCooler HP - Installation and commissioning 17
FläktGroup DC_10689GB 20220705_R1 Specifications are subject to change without further notice
8. DESCRIPTION OF THE FUNCTIONS
Unit sizes 008-041 have 1 circuit
Unit sizes 050-072 have 2 circuits
Pos Component
1:1-2 Supply air coil
2:1-2 Exhaust air coil
3:1-2 4 way valve
4:1-2 Compressor
5:1-2 Liquid separator
6:1-2 Refrigerant receiver
7:1-2 Filter dryer
9:1-2 EEV 2 cooling
10:1-2 EEV 1 heating
11:1-2 High pressure sensor
12:1-2 Low pressure sensor
13:1-2 Suction gas sensor
14:1-2 Liquid temperature sensor
15:1-2 Discharge gas sensor
16:1-2 Low pressure service connector
17:1-2 High pressure service connector
18:1-2 High pressure service connector
18 Defrosting pressure sensor GP8
19 Rotor
20 Electrical heater
21:1-2 High pressure switch
GT6 Automatic thermal protection
GT7 Manual thermal protection
Cooling mode
Heating mode
DISMANTLING
When dismantling (scrapping) this type of unit, the refrigerant and
compressor oil must unconditionally be collected and contained for
destruction/recycling.
Any work on the refrigerant circuit must be carried out by an autho-
rised person with the necessary training and certification in accor-
dance with the F-Gas Regulation.
SPARE PARTS
Spare parts can be bought from FläktGroup or via local refrigeration
suppliers. Contact your local FläktGroup office for information regar-
ding components that need to be replaced.
ReCooler HP - Installation and commissioning
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FläktGroup DC_10689GB 20220705_R1 Specifications are subject to change without further notice
9. ALARM HANDLING AND TROUBLESHOOTING
The alarm button is lit. At the bottom of the menu bar
information is shown regarding which circuit is
alerting (units with two circuits).
To check alarm-s of alerting circuit switch to the current
circuit by pressing the Enter button for 2-3s.
Press the alarm button to see the active alarm for the
selected ciruit. Follow instructions on the screen to get
to the Alarm log/Data logger.
The log shows information from the time when the alarm
was activated.
Alarm reset is possible only when the fault is remedied,
most alarms have automatic reset up to 5 times but can
be reset by pressing the alarm button for 5 sec. Some
alarms require a reboot.
FläktGroup
Off by low flow
Circuit 01
FläktGroup Circuit 01
Mode
Cooling
Control signal
000%
Off by low flow
%
535
000
%
000
ALARM LOG
Data logger E08
AL12 12:33 07/07/15
BMS offline
Low suction press
0: No alarm
Hi.Press 14.9 Comp031%
Lo.press 14.9 100-000
DiscTemp 081°c SSH 00.1
FläktGroup Circuit 01
If you contact Helpdesk at FläktGroup for support on your
ReCooler HP please take pictures of the ”Data logger” of
your last 10 alarms from alerting circuit and attach them
to the helpdesk request.
ReCooler HP - Installation and commissioning 19
FläktGroup DC_10689GB 20220705_R1 Specifications are subject to change without further notice
Alarm code Alarm displayed Alarm description/cause for alarm Possible solutions
AL01 Clock board fault or not connected Check connections. Contact FG CSS con-
trol department.
AL02 Extended memory error Contact FG CSS control department.
AL03 High pressure alarm The high pressure sensor has detected max. working
pressure of 39 bar and the controller stops the compressor. At
38 bar compressor start to ramp down. Cause: Extract air flow
is too low over condensing coil; overcharged system.
Check:
1. Air flow on extract side.
2. Min airflow rate over condensing coil
according FG. 3.
Filter or coil (they need to be clean).
4. Refrigerant charge/subcooling.
AL04 Low pressure alarm The low pressure sensor has detected value under min.
allowed pressure of 1 bar. Cause: Start up without Rotor run-
ning; At start up with low ambient temperature/condensing
temperature, several start attempts could be needed; low air
flow over evaporator; expansion valve is
in the wrong position; leakage in the system or Insufficient
refrigerant charge.
Check:
1. Rotor must be running before
compressor is started.
2. Min airflow rate over evaporating coil
according FG.
3. Refrigerant charge/superheat.
4. Search for possible leakage of
the system.
5. Allow the system to make several
attempts to start.
AL05 Frequency drive offline Check:
1. Cabel connection and 3-phase fuse
AL06 Power + alarms
0 - No alarm - -
1 - Overcurrent The drive has detected a current supplied that is too high
due to: too high load or sudden large load increase, wrong
parameter values or an inadequate motor.
Check the load, the dimension of the
motor and the cables.
2 - Motor overload The current supplied has exceeded the rated current over the
maximum time accepted.
3 - Overvoltage The DC voltage of the intermediate circuit has exceeded the
limits envisioned due to: deceleration that is too high or high
over-voltage peaks on the power supply network.
Check power supply voltage
4 - Undervoltage The DC voltage of the intermediate circuit is below the limits
envisioned due to: insufficient power supply voltage or a fault
inside the drive.
In the event of temporary cut-off of the
power supply, reset the alarm and re-start
the drive. Check the power supply voltage.
Check the 3-phase fuse and power supply
voltage
5 - Drive overtemperature The temperature inside the drive has exceeded the maximum
level allowed.
Check that the flow of cooling air is correct.
Check filter and fans in cabinet.
Check thermostat for fan.
Check that there is not dust in the heat sink.
Check the enviroment temperature.
Ensure that the switching frequency is not too
high with respect to the enviroment tempera-
ture and the motor load.
6 - Drive undertemperature The temperature inside the drive is less than the minimum
level allowed.
Check the enviroment temperature
7 - overcurrent HW The drive has detected an instataneous current supplied that
is too high due to: sudden strong load increase, motor cables
short circuit, wrong parameter values or inadequate motor.
Check the load, the dimension of the
motor and the cables.
8 - Motor overtemperature The temperature detected by the PTC thermistor corresponds to
a resistance > 2600 ohm.
Reduce the motor load.
Check motor cooling.
9 - IGBT module error Internal fault Call FG CSS for assistance.
10 - CPU error Loss of data in memory Call FG CSS for assistance
11 - Parameter default Execution of reset parameter default command. -
12 - DC-bus ripple Input power supply phase loss Check the input power supply phases to
the drive.
13 - Data communication fault Data reception failure Check the serial connection.
Switch the drive off and back on again.
14 - Drive thermistor fault Internal fault Restart the unit. Contact FG CSS control
department for assistance
15 - Autotuning fault Wrong parameter values Check the parameter values.
Restart the unit.
ALARM LIST
ReCooler HP - Installation and commissioning
20
FläktGroup DC_10689GB 20220705_R1 Specifications are subject to change without further notice
Continued Alarm list
16 - Drive disabled
(STO input open or not powered)
Alarm input on Power+ Frequency drive is activated. Check the wiring.
Check alarm input.
17 - Motor phase fault Motor cable disconnected Check the connections of the motor cable.
Contact FG CSS control department for
assistance
18 - Internal fan fault Restart the unit. Contact FG CSS control
department for assistance
19 - Speed fault Wrong parameter values or unsuited load.
High condensing temperature and very low speed.
Switch the drive off and back on again and
check the parameters are properly set.
Check the motor load. Increase minimum
speed.Default min. speed is 25 rps.
Change min. speed to 40 rps.
20 - PFC module error
(only for PSD00**2*0)
PFC overcurrent; C1, C2 terminals shortcircuit. Make a factory reset. Contact FG CSS
control department for assistance.
21 - not used - -
22 - PFC undervoltage
(only for PSD00**2*0)
Insufficient power supply voltage Check input power supply
23 - STO detection error Internal fault Restart the unit. Contact FG CSS control
department for assistance
24 - STO detection error Internal fault Restart the unit. Contact FG CSS control
department for assistance
AL07 N/A N/A
AL08 Low superheat Suction gas temperature sensor has detected superheat tem-
perature (suction pipe temp – evaporating temperature) under
minimum value. Cause: Expansion valve in wrong position or
sensors are not correct.
Check:
1. Turn main switch off and on again.
2. Check suction gas sensor and low
pressure sensor.
AL09 Low evaporation temperature
(LOP)
Not used
AL10 High evaporation temperature
(MOP)
Can be activated together with AL14.
AL11 Low suction gas temperature Not used
AL12 Attempt to start compressor
failed
Compressor has not increased pressure difference of 0.2 bar
in 60s compared with the conditions before start. Automatic
restart 5 times. After that a manual reset is needed.
Manual reset. Check compressor electric
wires. Increase in M06/Co08 pressure
variation monitoring delay from 15 to 60s.
AL13 Compressor outside envelop
limits
Condensing or evaporating temperatures out of allowed area. Check:
1. Air flow on supply/exhaust side
2. Too low outdoor temperature
AL14 Low differential pressure Pressure difference (DELTA P) between evaporating and con-
densing pressure is too low. Pressure ratio must be min. 1.8
according compressor envelope. If pressure ratio is under 1.8
in 120s than alarm is coming.
Check:
1. If expansion valves are connected
correctly
2. ROTOR is not working
AL15 High discharge temperature Compressor is overheated. Too high condensing temperature
and too low evaporating temperature. Too high suction gas
superheat. Frosted evaporater.
Check:
1. Air flow on supply/exhaust side
2. Low outdoor temperature (heating)
3. Check defrosting 4.
If discharge temperature is high and
low/high pressure normal, contact
FG CSS
AL16 Rotor reference analog input
fault (U1) connected with ana-
log signal (0-10V)
Alarm is coming from CAREL controler because of inter-rup-
tion,short circuiting and if voltage is higher than 12V.
"Check:
1. If polarity is connected right
2. Check voltage
3. Input impedance is 20k ohm
4. With 10V current is 0,5mA
(theoretical) ”
AL17 Defrost temperature
probe fault (U2)
Check the defrost temperature sensor/
sensor wiring
AL18 Suction temperature
probe fault (U3)
Check the suction gas temperature sen-
sor/sensor wiring
AL19 Discharge temperature probe
fault (U4)
Check the discharge temperature sensor/
sensor wiring
AL20 Discharge pressure probe fault
(U5)
Check the high pressure sensor/sensor
wiring
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FläktGroup ReCooler HP Generation 5 Installation and Maintenance Manual
- Category
- Split-system air conditioners
- Type
- Installation and Maintenance Manual
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