Fläkt Woods
8643 GB 2012.11
4
We reserve the right to alter specifications
Installation and Maintenance Instructions
EQKA Cooling unit
Installation and Commissioning
Connection of the water-cooled condenser
Cooling units equipped with a KD-W water-cooled
condenser (see unit specification) must be connected to
a mains water supply having a minimum pressure of 0.5
bar and a maximum pressure of 10 bar. Use an appropri-
ate coupling for connecting the mains water supply (see
pipe connection instructions on the cooling unit).
Follow the arrows carefully. If heat is recovered, the
drain water must be connected to an accumulator tank.
Important!
Check list
– Always study the safety directions
on page 2 before beginning all work!
– The air handling unit must not be
commissioned until the installation
had been inspected according to the
check list below!
Before
commissioning check the
following:
– Condition on delivery - no transport
damage, installation site, (adequate
lighting, supporting surface etc.)
– No leakage of compressor oil
– Follow-up tightening of the Rotalock
connection
– Phase sequence and retightening of
the power supply connection
– Cooling control signal from the air
handling unit
– Cooling energy recovery not enabled
– Crankcase heater is operating
– Condensate drainage, cooling instal-
lation report submitted
– There are no loss cables
After
commissioning check the
following:
– outdoor-/suppllyair temperature
– condensation-/evaporating
– hot gas temperature/
subcooling/overheating
– operating currents
– information to staff-performed.
In a cooling unit with KD-W water-cooled condenser,
the mains water supply must not be shut off.
To start the cooling unit
If the cooling unit is commissioned in cold weather, i.e.
when the temperature is below +15 °C, the compressors
must be pre-heated: Set the protective motor switch of the
compressors to position 0 (Off). Set the main switch insi-
de the cooling unit to position 1 (On) and activate the
control circuit fuse. The crank case heater now heats up
the compressor. If the ambient temperature is below +15
°C, wait for 4-8 hours until the compressor has become
warm, before you start up the compressors.
To set the setpoint for cooling
When cooling is required, the controller in the air
handling unit transmits a control signal (0 – 10V) to the
cooling unit which switches in the capacity steps in
proportion to the signal.
Performance check
The performance of the cooling unit can be tested by
temporarily lowering the cooling setpoint to the point
that the cooling unit starts up.
Inspection
For a description of the control unit, see page 9. The
control function of the air handling unit should include
a minimum temperature sensor in the supply air located
as far as possible from the air handling unit, and a room
or extract air sensor. The cooling unit should be inter-
locked across the extract air fan (and also an outdoor
thermostat). It is important that the compressors stop if
the extract air fan stops. Due to the location of the con-
denser coil, so-called cooling energy recovery cannot be
utilized at the same time as the cooling unit is in operation.
High pressure condenser, KD
If condenser heat cannot be emitted into the extract air,
KM1 (“Capac.Control”) will first be automatically swit-
ched off, however if this is insufficient, the high pressure
switch will open and must be manually reset, (see page 9).
Alarm
All the alarms are indicated on the display of the
control unit (see page 10). Potential-free closure is on
the wiring terminal for group alarm transmission, if
required.
Important!
If the unit is installed outdoors, the
heat carrier must contain an appro-
priate mixture of anti-freeze agent to
suit the climate.
Important!
If anti-freeze agent is used, the unit
must have a closed system for the heat
carrier.