FläktGroup EQKC Series User manual

FläktGroup DC_8931GB 20180202_R0 We reserve the right to make changes without prior notice
LIFTING
Warning!
The unit’s centre of gravity is not in the centre
of the unit.
SAFETY INSTRUCTIONS
IMPORTANT INFORMATION!
• Study the unit’s installation and maintenance instructions
carefully prior to starting/operating/servicing/maintaining/
dismantling it. Keep these instructions for future use.
• All service and maintenance must be carried out by experts.
The service/maintenance of cooling and water systems may
only be carried out by authorised companies using certified
personnel in accordance with European Union Regulation
303/2008 and the necessary protective equipment.
• The necessary protective equipment should include safety
goggles and gloves.
• Automatic start! Open and lock the cooling unit’s main circuit
breaker before starting any work.
• Do NOT tread on the unit.
• Use only original spare parts.
Disregarding any of the above points can lead to a serious
safety risk and the withdrawal of the guarantee/ product
liability.
Warning!
The unit must be commissioned by authorised
FläktGroup personnel.
Because of its design, the centre of gravity is offset towards
the inspection side. This must be taken into account when
lifting the unit in any way. The unit should first be lifted slightly,
and then checked so that it does not tilt or appear unstable
before being lifted higher.
COMBI COOLER
EQKC
INSTALLATION AND MAINTENANCE INSTRUCTIONS

EQKC COMBI COOLER
FläktGroup DC_8931GB 20180202_R0 We reserve the right to make changes without prior notice
Installation and maintenance instructions
2
WEIGHT
DUTY OF NOTIFICATION AND IN-SERVICE INSPECTION
Duty of notification
If the amount of refrigerant in a unit exceeds 10 kg the super-
visory authorities, generally the environmental health depart-
ment, must be informed. This information must be provided
well in advance of installation. More information about this is
contained in local refrigerant legislation.
Leak tracing during installation and in-service inspection
A leakage inspection must be carried out during installation
if the unit contains more than 3 kg of refrigerant (see local
restrictions). If the unit contains between 3 kg and 30 kg of
refrigerant, the unit must be inspected for leakage at least
every twelve months. This conforms to the EU regulation on
fluorinated greenhouse gases 842/2006.
LIFTING AND TRANSPORT
The unit can be lifted by its lifting eyes 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 the unit other than by using the specified holes can
cause the unit to overturn due to the offset centre of gravity.
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 and brine system. The base frame must not
be removed.
Requirements related to siting
The unit must be installed in such a way that allows service
in accordance with this service manual.
L
L
L
L
1050 kg
MAX.
Important!
The unit’s centre of gravity is not in the centre
of the unit. Always take this into account when
lifting the unit.
Standard isolation Min. weight Max. weight
EQKC 014 551 606
EQKC 018 663 668
EQKC 023 745 825
EQKC 032 841 1016
EQKC 041 995 1120
Heavy isolation Min. weight Max. weight
EQKC 014 598 653
EQKC 018 660 715
EQKC 023 793 873
EQKC 032 895 1070
EQKC 041 1052 1177

EQKC COMBI COOLER
FläktGroup DC_8931GB 20180202_R0 We reserve the right to make changes without prior notice
Installation and maintenance instructions
3
ALARMS AND WARNINGS
The Combi Cooler can be connected to an external control
system in several ways. The two most common are shown
below.
Option 1 describes how the integrated control unit can be maxi-
mised. This option has a number of advantages over option 2.
This is because the system is controlled optimally, based on
the all the expertise gained from product development.
Option 2 describes how much of this functionality is transferred
to an external control system. When this type of connection is
used the external control system must deal with some functions
that are crucial to the system’s performance.
65
63
64
51
52
53
54
55
56
57
58
59
60
61
62
66
67
68
L2
L1
L3
N
PE
L2
L1
L3
N
PE
Power supply
3 x 400 AC
1
2
1
2
33
55
44
SV2
Supply air coil
Valve actuator
Interlocked by the
outdoor temperatur
Interlocked by the
extract air fan
To be connected to the
main circuit breaker
Room condensation
indication
CP51 Operation
Signal for slow
valve closure
Summation alarmCooler alarm
Unit interlocked
by CP51
1
2
1
2
33
1
2
1
2
1
2
1
2
1
0
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
External
Combi Cooler
BMS/Unit
GH53
Room conden-
sation sensor
GT53
Chilled beam water
temperature sensor
SV53
Chilled beam water
valve actuator
1
G
G
0
G
G
0
Y
G
G
0
Y
Q11
Q12
2
3
4
1
2
3
1
2
3
1
2
3
4
1
2
3
1
2
3
24 V AC
Gnd
0 - 10 V DC
24 V AC
Gnd
0 - 10 V DC
0 - 10 V DC
24 V AC
24 V AC
Gnd
Min value
Gnd
C
D1
C
N0
C
N0
C
N0
N0
4 min
Option 1. Option 2.
Cooler alarm Summation
alarm
Condensation
alarm
CP51 Operation
SV2
Supply air coil
Valve actuator
Interlocked by the
outdoor temperature
Interlocked by the
extract air fan
Room conden-
sation indication
GH53
Room conden-
sation sensor
GT53
Chilled beam
water temper-
ature sensor
SV53
Chilled beam
water valve
actuator
Power supply
3 x 400 AC
To be connected to the
main circuit breaker
Unit interlocked
by CP51
24 V AC
Gnd
0 - 10 V DC
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
33
1
2
1
2
1
2
1
2
1
G
G0
G
G0
Y
G
L1
L2
L3
N
PE
G0
Y
G
G0
Y
Q11
Q12
2
165
63
64
51
52
53
54
55
56
57
58
59
60
61
62
66
67
68
69
70
71
72
73
74
2
3
4
3
1
2
1
2
33
1
2
1
2
33
1
2
1
2
33
55
44
4
Combi CoolerBMS/Unit
External
L1
L2
L3
N
PE
C
N0
C
N0
C
N0
C
N0
N0
C
N0

EQKC COMBI COOLER
FläktGroup DC_8931GB 20180202_R0 We reserve the right to make changes without prior notice
Installation and maintenance instructions
4INSTALLATION AT HIGH ALTITUDES
Control system eQ
Control system
Combi Cooler
Styrsystem
Combi Cooler
ALARM
0-10 V
Summation Alarm
CP51 Operation
52
51
57
56
60
59
58
64
63
Styrsystem eQ
Supply air coil
actuator
GO
AR
GO
GP 3/4
Z
GO
AC
YR
YH
24 VAC GO
G
START START
NO
C
YC
Alt.
Control signal
heating
HEATING
Ventilställdon värmeeQ Styrlåda
(M)
(Y)
(G0)
(G)
Y
G0
G
M
Interlocking
61
62
Valve actuator heating
Control box eQ

EQKC COMBI COOLER
FläktGroup DC_8931GB 20180202_R0 We reserve the right to make changes without prior notice
Installation and maintenance instructions
5
FROST PROTECTION SENSORS
COMPONENT DESCRIPTION
Control unit (RC1)
The control unit is located in the control cabinet. See descrip-
tion on Page 9.
Control circuit fuse
Reset the automatic fuse by pulling the green control upwards.
Main circuit breaker
The main circuit breaker is used to switch the cooling unit off
and on. When performing work on the cooling unit, always
open and lock the main circuit breaker. Certain terminal blocks
can be live even when the circuit breaker is switched off, such
as the terminal blocks for outgoing summation alarms.
Important!
The setting of the frost protection sensors
must not be altered. This could lead to
frost bursting the exchangers. Burst pipes
due to frost will result in major leakage of
fluid and risk of compressor damage.
The control circuit fuse does NOT cut
the power to the entire cooling unit.
When performing work on the cooling
unit, always open and lock the main
circuit breaker.
ELECTRICAL DATA, FUSE PROTECTION AND AMOUNT
OF REFRIGERANT
This product contains fluorinated greenhouse gas, R134A,
with a GWP-factor of 1430. Refrigerant quantity: 5,2 – 22,8 kg,
corresponding to 7,4 – 32,6 tonnes of CO2equivalent.
Choice of cable
The choice of cable depends on the method of installation.
The cable must be dimensioned by an authorised electrician.
Fuse protection
The level of fuse protection must be decided by an authorised
electrician based on the currents indicated in the table.
The brine circuit
The brine circuit must be filled with deacidified water.
Otherwise there is a risk of standing air in the system that
can lead to impaired performance.
Unit size Power
model
Min. fuse
A
Refrigerant kg
Circuit 1 Circuit 2
014
1 25 5.2 8.1
2 40 5.2 9.0
3 40 6.2 10.5
018
1 40 6.6 11.3
2 40 8.5 12.7
3 50 8.5 14.6
023
1 40 9.4 15.8
2 63 9.9 16.8
3 63 9.9 17.3
032
1 63 10.5 18.5
2 80 10.9 18.5
3 100 10.9 20.0
041
1 80 11.5 21.8
2 100 12.5 22.3
3 120 13.4 22.8
Important!
There must be no additives in the water.

EQKC COMBI COOLER
FläktGroup DC_8931GB 20180202_R0 We reserve the right to make changes without prior notice
Installation and maintenance instructions
6
Aeration
All valves must be opened / closed several times during
aeration for all trapped air to escape. Since the subsystems
are connected in common water system will not be any part
of the work unless the aeration is performed correctly.
Brine connections – general
Connected pipes are to have as few bends and variations in
size as possible. If the pressure drop is too high, the pump
will not provide the design flow, leading to insufficient heat
transfer in the heat exchangers. Ensure that the pipe system
is flushed and drained before connection to the cooling unit.
Automatic or manual bleed valves
Automatic or manual bleed valves must be installed in enough
places to bleed the system.
Drain valve
The drain valve must be installed at the lowest point in
order to drain the system.
Leakage testing
A leak tightness test must be carried out before insulating
the pipes.
Expansion forces on the connections
All connections for the brine and the external heating system
outputs on the cooling unit must be made in such a way that
there are no forces acting on them caused by the thermal ex-
pansion of the pipes.
Leakage testing
A leak tightness test must be carried out before insulating
the pipes.
Insulating the pipes
All pipes must be insulated to prevent condensation. The insu-
lation must be diffusion tight. It must be possible to access
bleed valves and drain valves following insulation.
Filter (max. gauge = 500 μm)
It is essential that the water is free of impurities. If not the heat
transfer in the heat exchangers will be reduced as they get
dirty. In the worst case the exchanger can be permanently
damaged. The filter should be mounted on the water circuit’s
inlet to the cooling unit, in a position where it can be easily
flushed or replaced.
For simplicity’s sake there should be shut-off valves on both
sides of the filter.
Brine
The cooling unit is designed for pure water. In other words,
there should be no additives in the water.
Expansion tank
The expansion tank should be installed in a suitable location.
ADJUSTING THE FLOW SWITCH
The function of the flow switch is to stop the compressors if
the brine flow drops below a critical level or stops completely.
Because every cooling unit undergoes pre-delivery testing,
the flow switch is factory set. Testing is carried out at the flow set
out in table 1. However, this adjustment must still be checked
due to possible differences in flow measurement methods.
Actual flow: Green LEDs
Alarm limit: Orange LED
Triggered alarm: Red LED
Step 1 – Calibrate the flow switch
1. Check that the brine flow is the intended operating flow.
2. Press the right button (black arrow) for five seconds.
3. The flow switch is now calibrated.
Step 2 – Setting the alarm limit
Set the alarm limit (orange LED) by pressing the black or
white arrow. The alarm limit is recommended to be set
about 2-3 LEDs below the top green LED.
Important!
Aeration must be made of all subsystems.

EQKC COMBI COOLER
FläktGroup DC_8931GB 20180202_R0 We reserve the right to make changes without prior notice
Installation and maintenance instructions
7
FOLLOWING A FLOW ALARM
Check why the alarm was generated. Possible causes:
• Dirt in the system.
• Incorrectly set flow switch.
• The brine pump is defective or incorrectly set.
FROST PROTECTION
A frost protection sensor must be installed in the supply air coil
to prevent it freezing.
UNIT SPECIFIC FLOW
Table 1
The right flow through the evaporators has to be set in accor-
dance with table 1. The safety and function of the cooling unit
are at risk if a flow other than the specified in table 1 is used.
THE COIL CIRCUIT
Table 2
FLOW THROUGH THE SUPPLY AIR COIL
The flow through the supply air coil has to be adjusted to
obtain the correct power distribution between the supply air
and the chilled beam circuit. The flow is both adjusted and
measured with the STAD valve located inside the Combi
Cooler. The right flow over the supply air coil is available in
the unit documentation. The technical sales support division
at FläktGroup has to be contacted if the unit documentation
is not supplied at delivery. It’s summer case that the flow is
adjusted for. Therefore, valve SV2 shall take the entire flow
from the cooling circuits of primary flow, ie the connection
that comes from above.
eQ size Power model Brine flow l/s
014
1 0.85
2 1.14
3 1.36
018
1 1.04
2 1.36
3 1.69
023
1 1.44
2 1.84
3 2.17
032
1 2.17
2 2.73
3 3.17
041
1 2.73
2 3.42
3 4.01
Warning!
Adjustment of flow.
Warning!
Adjustment of flow. You will find the flow in
the unit (summer case) or current sellers.
eQ size Output variant
Supply coil Min. flow Max. flow
014
1 0.4 0.7
2 0.5 0.9
018
1 0.6 1.0
2 0.7 1.1
023
1 0.6 1.1
2 1.1 1.7
032
1 0.8 1.4
2 1.2 1.9
041
1 1.3 2.0
2 1.5 2.0

EQKC COMBI COOLER
FläktGroup DC_8931GB 20180202_R0 We reserve the right to make changes without prior notice
Installation and maintenance instructions
8
WATER-COOLED CONDENSER
The water-cooled condenser is activated by an automatic
water regulating valve. The water regulating valve is factory
set and should not be adjusted. Incorrect adjustment can
result in high water consumption.
CONNECTING THE WATER-FILLED CONDENSER
If there is a water-cooled condenser, tap water at a minimum
0.5 and maximum 10 bar pressure must be connected. Tap
water is to be connected using a suitable union. Outgoing
pipes are 15 mm copper pipe. Follow the arrows carefully.
Water leaving the water-filled condenser can be connected
to an accumulator tank so as to recover the heat. In cooling
units with a water-cooled condenser the tap water inlet can
not be closed.
DRAINAGE FROM A WATER-FILLED CONDENSER
When the water-cooled condenser is in use, it must be drained
to an outflow. If this does not take place, there is a risk of water
damage. Drainage takes place through the copper pipe on
the front of the cooling unit beneath the inspection hatch. The
white plastic pipe is for condensate runoff from the supply air
coil and should be connected to a water trap.
Runoff from the water-filled condenser
Runoff from the supply air coil
Run off from the supply coil
Run off from the water-filled condenser
INSTALLATION AND COMMISSIONING
Checklist
BEFORE STARTUP, CHECK THE FOLLOWING:
General
• Transport damage, installation site (good lighting, level
surface etc.)
• Condensation drain
• Oil level in compressors
• Runoff from the water-filled condenser
Refrigerant circuit
• Leakage of refrigerant, leakage of compressor oil
• Crankcase heater in operation
Electrical connection and control – checking for loose cables
• Phase sequence and post-tightening power connections
• Post-tightening all wiring including those for control signals
• Start signal from the air handling unit
• Cooling recovery not activated in the main unit
• Valve governing the water temperature to the chilled beam
circuit connected
• Temperature sensors on the chilled beam circuit connected
Brine – brine circuit leakage
• Is the specific flow for the unit size adjusted (see page 7)
• Is the right flow for the coil circuit adjusted (see page 7)
• Has the system been bled
• Filter installed
• Pumps for the supply air coil and main circuit working
• Pump for the chilled beam circuit working
• Check for the need for an accumulator tank
STARTING THE EUKN COOLING UNIT
The crankcase heaters must have been in operation for at
least 24 hours before commissioning:
1. Set the compressor motor circuit breaker to position 0 (Off).
2. Set the main circuit breaker in the cooling unit to position 1
(On) and activate the control circuit fuse. The compressors
are now heated by the crankcase heater.
Important!
Always study the safety instructions on
Page 1 prior to carrying out any work.
The unit must not be commissioned before
its installation has been inspected in accor-
dance with the following list.

EQKC COMBI COOLER
FläktGroup DC_8931GB 20180202_R0 We reserve the right to make changes without prior notice
Installation and maintenance instructions
9
COOLING UNIT
Inspecting the sight glasses
The unit has two sight glasses, one mounted between the con-
denser coil and subcooling coil, and the other downstream
of the subcooling coil.
The purpose of the first sight glass is to check whether gas is
entering the subcooler. If this is the case, the subcooler will
not operate optimally and will just act as an extension of the
condenser coil. It is difficult to avoid a small amount of gas, but
large amounts can be an indication that there is too little refri-
gerant in the system.
Because the amount is adjusted at the factory, this means that
there is a risk of leakage in the refrigerant circuit.
Checking subcooling
Subcooling can be checked by measuring the temperature
difference between the inlet and outlet of the subcooling coil.
Superheating
The correct degree of superheating is important for optimum
and reliable operation. If superheating is too great, the hot
vapour downstream of the compressor will get unnecessarily
hot. If superheating is insufficient there is a risk of liquid leaking
into the compressor. This can result in compressor damage.
Condensation temperature
At times the condensation temperature can be quite high,
almost 60 °C. This is normal. The system is designed for such
temperatures.
Inspection
The function of the cooling unit can be tested by checking
the temperature difference with the control unit.
This check can also be carried out during maintenance in
order to check the cleanliness/performance of the heat
exchangers in the system.
AFTER STARTUP, CHECK THE FOLLOWING:
• Operating flows
• Flow to the supply air coil and main circuit correct
• Information to personnel undertaken
FUNCTION
The compressors are connected in three cooling stages.
The outgoing water temperature depends on whether there is
a risk of condensation in the chilled beams or not. See Page 9
for a description of the control unit.
The air handling unit can be used for both supply air and extract
air control. The cooling unit must be interlocked by the extract
air fan and main pump (and any outdoor thermostat). It is im-
eQ size Power model
Nominal power
with water at
18/12
014
1 21
2 29
3 34
018
1 26
2 34
3 43
023
1 36
2 46
1 55
032
1 55
2 69
3 80
041
1 69
2 86
3 101
portant that the compressors stop if the extract air fan stops.
The cooling unit is also internally interlocked by a flow switch
in the water circuit and the pump for the supply air coil.
Because of the location of the condenser coil, the cooling re-
covery function cannot operate in the unit while the cooling unit
is in operation.
Overriding the chilled beam circuit valve
If the heating load on the chilled beam circuit exceeds the
design cooling power, the valve for the outgoing water tem-
perature to the chilled beam circuit will be overridden, so as
to prioritize the supply air coil. This is to ensure that the supply
air coil can dehumidify air when required. If this function is
not used in the integrated control unit, it must be added to
the controller that replaces it.
Capacity regulation
The capacity of each circuit is regulated individually. If the
pressure is too high, one or both of the compressors will be
shut down. This is to maintain as high a cooling power as
possible and to prevent a shutdown that would require a
manual reset. The compressors are restarted in sequence.
Water-cooled condenser
A water-cooled condenser can be ordered as an option.
If the condenser heat cannot be released to the extract air,
the condenser temperature will rise. In that case the water-
cooled condenser is automatically engaged at 60 °C to
reduce the temperature.
COOLING UNIT

EQKC COMBI COOLER
FläktGroup DC_8931GB 20180202_R0 We reserve the right to make changes without prior notice
Installation and maintenance instructions
10
Control
The cooling unit supplies cold water in the brine circuit to the
integrated supply air coil and to the chilled beam circuit. Hot
water enters the circuit via the integrated plate heat exchanger.
The valve governing the amount of water to the supply air coil
and plate heat exchanger is controlled by external control
equipment. The valve and valve actuator for the supply air coil
are mounted in the cooling unit, and are included in the deli-
very. The valve and valve actuator for the plate heat exchanger
are not included in the delivery, but are available as acces-
sories.
The cooling unit governs both the temperature to the main
circuit and to the chilled beam circuit. Both of these setpoints
change depending on whether the unit is in normal operation
or setpoint offset (risk of condensation).
Normal operation
The compressors are controlled by the return temperature from
the chilled beam circuit. If the system is correctly adjusted, the
output temperature in the main circuit should be approximately
12 °C, irrespective of how many compressors are in operation.
In normal operation, the setpoint of the water to the chilled beam
circuit is 15 °C as standard.
Setpoint offset (risk of condensation)
The compressors are controlled by the water temperature down-
stream of the evaporators. The temperature in the main circuit
must be approximately 6 °C, otherwise there is a risk that the
adjustment will be incorrect.
In setpoint offset operation the setpoint of the water to the chilled
beam circuit is 17 °C as standard.
Outdoor
air
Chilled beam
circuit
Buffer tank
Supply air
+
GP52 GT52
CP52
SV53 CP53
GT53 GH53
SV1
CP51
SV2
GT5
Components placed in Combi Cooler
Label Function Delivery
CP51 Circulation pump, supply air coil Included, mounted and connected
CP52 Circulation pump, cold water circuit Not included
CP53 Circulation pump, chilled beam water circuit Not included
GH53 Condens indicator Included, lose accessory
GP52 Flow indicator Included, mounted and connected
GT5 Frost sensor Included when delivered with factory mounted control
GT52 Temp sensor, cold water circuit Included, mounted and connected
GT53 Temp sensor, chilled beam water circuit Included, lose accessory
SV1 Heating valve Not included
SV2 Cooling valve Included, mounted and connected
SV53 Chilled beam valve Not included

EQKC COMBI COOLER
FläktGroup DC_8931GB 20180202_R0 We reserve the right to make changes without prior notice
Installation and maintenance instructions
11
OPERATION OF THE PLC
By pressing the button A, the next picture comes up.
Returning to picture 1 by pressing button B.
To change the values, press button up (+) or button down (-)
to get to the actual value. Press OK and then adjust the value
with Button Up (+) or button down (-). Press OK to store the
value. Return to Figure 1 by pressing button B.
SCREENS ON THE PLC
* (--.-) No value is displayed if the temperature sensor from
the chilled beam circuit is connected to the BMS, i.e.
when the BMS is controlling the chilled beam circuit
instead of the Cooler/PLC.
Screen 1
The screen displays operational
and alarm information (also see
the separate description of
screen 1).
CoolWater In 18.0 Input water temperature
(return temp.)
1 = Wait (s) 300
For example KM1 has a 5 min.
start delay.
(The time is counted down)
2=Run For example KM2 is in
operation.
Screen 2
Normal running/
Condense sensor= ON
Displays the applicable setpoint.
See screens 4 and 5.
Coolwater Out1 8.0 Output water temperature from
cooling circuit 1.
Coolwater Out2 8.1 Output water temperature from
cooling circuit 2.
Screen 3
BeamWater In 15.2 (--.-)* Input water temperature to the
chilled beam circuit.
Valve signal % 085 (---) Control signal to the chilled
beam valve 0–100 % = 0–10V.
(Forced closing)
The text is displayed in
the event of the forced closure
of the chilled beam valve.
Screen 4
Setpoints when
Normal running
The setpoints applicable during
normal operation, i.e. when the
condensation sensor in the
room is not generating an alarm
(=OFF).
CoolWater In 18.0 Input brine temperature setpoint
(return temp.)
BeamWater In 15.0 (--.-) Input water temperature set-
point to the chilled beam circuit.
Screen 5
Setpoints when
Condense sensor= ON
The setpoints applicable when
there is a risk of condensation,
i.e. when the condensation sensor
in the room is generating an
alarm (=ON).
CoolWater In 10.0 Input brine temperature setpoint
(return temp.)
BeamWater In 17.0 (--.-) Input water temperature set-
point to the chilled beam circuit.
Screen 6
Run Time (h) Total run time for each
compressor.
KM1 Total= 00048 For example KM1 has been in
operation for 48 hours.
KM2 Total= 00025 For example KM2 has been in
operation for 25 hours.
(Step 3)= 00012 KM1 and KM2. Joint operation 12 h.
Screen 7
Time: 11.25
Current time. Can be set if CP52
is to be exercised at the desired
time (12:00).
CombiCoolerProgram
2KM: V1.03 Program version
Date : 090202 Program release
Continued on next page

EQKC COMBI COOLER
FläktGroup DC_8931GB 20180202_R0 We reserve the right to make changes without prior notice
Installation and maintenance instructions
12
OPERATIONAL AND ALARM INFORMATION
Display message Explanation
* 3-Fase Alarm * Alarm from the phase break relay,
phase sequence fault relay
* Low Water Flow * Water flow in the brine circuit too
low.
* Cooler stopped *
(Interlocked)
Cooler and CP51 interlocked by the
fan/outdoor temperature sensor.*
* Start up delay *
Wait (s) 120
Start delay 2 minutes so the unit
damper has time to open.
1=Alarm Q1 / Term. KM1’s Motor protection or
Thermistor has tripped.
2=Alarm Q2 / Term. KM2’s Motor protection or
Thermistor has tripped.
1=Alarm HP push
ESC
KM1’s High pressure switch 1
has tripped.
2=Alarm HP push
ESC
KM2’s High pressure switch 2
has tripped.
1=Alarm Low press. KM1’s Low pressure switch
has tripped.
2=Alarm Low
Press.
KM2’s Low pressure switch
has tripped.
1=WaterTemp
Alarm
Ouput Temp. circuit 1 is less
than 3 °C. Reset the alarm relay
2=WaterTemp
Alarm
Ouput Temp. circuit 2 is less
than 3 °C. Reset the alarm relay
1=WatTemp Stop
300
KM1 stopped for 5 min. if the temp.
in circuit 1 is less than 4 °C.
2=WatTemp Stop
300
KM2 stopped for 5 min. if the temp.
in circuit 2 is less than 4 °C.
1=Capacity Alarm KM1’s Capacity switch has tripped.
Alarm locked for 1 min.
2=Capacity Alarm KM2’s Capacity switch has tripped.
1=Capac. Stop :600 KM1 stopped for 10 min.
2=Capac. Stop :600 KM2 stopped for 10 min.
1=Blocked (s) :180 Stage 1 blocked for 3 mins. during
down regulation from stage 3.
2=Blocked (s) :180 Stage 2 blocked for 3 mins. during
down regulation from stage 3.
1=Wait (s) :300 Start delay of stage 1 for 5 min.
2=Wait (s) :300 Start delay of stage 2 for 5 min.
3=Wait (s) :300 Start delay of stage 3 for 5 min.
1=Run KM1 in operation.
2=Run KM2 in operation.
* An external start signal to the cooling unit also starts/
stops CP52. When stopping, the pump runs for a further
2 minutes before it stops. The pump is also exercised
daily between 12:00-12:02.

EQKC COMBI COOLER
FläktGroup DC_8931GB 20180202_R0 We reserve the right to make changes without prior notice
Installation and maintenance instructions
13
OPERATION AND MAINTENANCE
Inspecting the sight glasses
• The cooling unit is part of the air handling unit and is installed
as a unit module
• The cooling unit operates independently and has its own
control cabinet. Start signals are provided by the air handling
unit.
• The cooling unit is intended to cool supply air in the tempera-
ture range +20 °C - +32 °C. Lowering the temperature of the
brine by 5–7 °C is possible depending on the selected air
temperature, supply air/extract air ratio and operational case.
Inspecting the sight glasses
The cooling unit’s service component has an electrical appara-
tus cabinet generally containing the following equipment:
• Main circuit breaker
• Control circuit fuse
• Motor circuit breaker
• One frost protection sensor for each circuit
• Control unit with display
The service component also contains sections of the piping
that distributes the brine (the cold water) to the supply air coil
and chilled beam circuit. The illustration below shows the
components in the service compartment, the components
included in the delivery, and the components required to allow
the entire cooling unit to be utilised fully.
INSPECTION
(Carried out by the owner/user once a week) Check (look/
listen for) the following:
1. Alarm indications
2. Abnormal noise/vibrations
3. Fluid leakage (oil, water)
4. Corrosion, wear
5. Mountings, brackets
6. Unit compartment, lighting
MAINTENANCE
(Must be carried out by a refrigeration service company or
corresponding undertaking at least once a year).
Check the following:
1. Evaporation/condensation temperature. Leakage inspection
(every 12 months) in accordance with EU requirements.
2. Hot vapour temperature.
3. Expansion valve (superheating of suction vapour).
4. Safety equipment (pressure switch trip function).
5. Cooling capacity.
6. Automation and control equipment (functional inspection)
7. Electrical equipment (post-tightening power connection).
8. Cleaning (batteries, drip trays, drains).
9. Outlet filters.
Water circuit
10. Cleanliness and effectiveness of all plate heat exchangers
(evaporators, incoming).
11. Filter.
12. Pipe connectors and welds.
13. Pipe insulation.
14. The temperature differential across the heat exchangers is
checked via the control unit. Carried out to check clean-
liness/performance across the exchanger.
IN-SERVICE INSPECTION
Inspections must take place at least once a year and be regis-
tered in accordance with EU regulations on fluorinated green-
house gases 842/2006, Article 3.
Check the following:
1. Pipes
2. Leak trace the refrigerant system
3. Vibration test
4. Corrosion inspection
5. Refrigerant filling
6. Oil leakage
7. Safety equipment
8. Joints/seals
REMOVAL
When removing, (scrapping) this type of unit all refrigerant and
compressor oil must always be taken for destruction/recovery.
TROUBLESHOOTING
NOTE! Faults must always be remedied without delay.
The service/maintenance of cooling and water systems may
only be carried out by authorised companies using certified-
personnel in accordance with European Union Regulation
303/2008 and the necessary protective equipment.
SPARE PARTS
Spare parts can be bought via local cooling suppliers. Contact
your local FläktGroup office for information regarding compo-
nents that need to be replaced.
Important!
Always study the safety instructions on Page 1
prior to carrying ! out any work.