HEAT PUMPS - AIR CONDITIONING - REFRIGERATION - AIR HANDLING - HEAT EXCHANGE - NA 12.122 H
Water chillers and
air-water heat pumps
41
CIATCooler LP
- All CIATCooler models are equipped with scroll type compressors and
have a phase control relay.
Verify that they turn in the
correct direction and, if not,
reverse the power wires.
12. COMMISSIONING
- It is advisable to make a complete sketch of the installation including
the location of the unit and all the components used in the hydraulic
circuit (cut-off and safety valves, water fi lter, circulation pump, buffer
tank, etc.). It will be very useful for maintenance and repairs in the
installation.
- Verify the absence of any leaks of the refrigerant.
- The following must be verifi ed:
• That the electrical power supply remains constant and that it
corresponds to that featured on the unit data plate.
• That the electric installation has been carried out according to the
electric wiring diagram provided with the unit (consult the chapter
on “Checking before commissioning”).
• The correct connection of the sensors supplied with the unit.
• That they are no cables close to heat sources.
- Once the above verifi cations have been carried out, the control circuit
is supplied with voltage by the automatic control switch. It is necessary
to leave the compressor crankcase heater with voltage for 24 hours
before starting the compressor.
Checks prior to commissioning
WICHTIG: WIEDERBEHEIZUNG DER
OLWANNE
IMPORTANT: CRANKCASE HEATING
IMPORTANT: SURCHAUFFE CARTER D’HUILE
IMPORTANTE: RISCALDARE IL CARTER
DELL’OLIO
IMPORTANTE: RECALENTAMIENTO DE
ACEITE DEL CÁRTER
KOENNEN.
TO ALLOW THE COMPRESSOR(S) STARTING
AU PREMIER DÉMARRAGE OU APRÈS UNE ABSCENCE
TENSION 24 HEURES AVANT D’AUTORISER LE
DÉMARRAGE DU(DES) COMPRESSEUR(S).
AL PRIMO AVVIAMENTO U DOPO UNA INTERRUZIONE
PROLUNGATA DELLA ALIMENTAZIONE ELETTRICA,
LASCIARE LA MACCINA SOTTO TENSIONE PER 24 ORE
PRIMA DI AUTORIZZARE L’AVVIAMENTO DEL(DEI)
COMPRESSORE(I).
ANTES DEL PRIMER ARRANQUE O DESPUÉS DE UNA
AUSENCIA DE CORRIENTE POR UN LARGO PERIODO DE
TIEMPO, CONVIENE QUE LA UNIDAD ESTÉ CONECTADA
UN MÍNIMO DE 24 HORAS.
BEIDER ERSTEN INBETRIEBSETRUNZ ORDER NACH EINER
LANGEN STROMUNTER-BRECHUNG BRINGEN SIE DIE
MASCHINE UNTER SPANNUNG 24 STRUNDERLANG
BEVOR SIE DEN(DIE) KOMPRESSOR(EN) EINSCHALTEN
FOR THE FIRSTSTART OR AFTER ALONG TIME OUT OF
VOLTAGE PUT THE MACHINE ON LIVE 24 HOURS BEFORE
DE COURANT PROLONGÉE, METTRE LA MACHINE SOUS
COMPRESOR SCROLL.
COMPROBAR SENTIDO DE GIRO
COMPRESSEUR SCROLL.
VÉRIFIER LE SENS DE ROTATION
SCROLL COMPRESSOR.
CHECK SENSE OF ROTATION
Adjustment of the water fl ow
- The fi lling of the hydraulic circuit is then carried out:
• Open the water circuit valves and ensure that the water circulates
around the exchanger with the pump in service.
• Bleed the air in the hydraulic circuit.
• Verify the operation of the water circulation controller and the cold/
hot water control.
- Factory set confi guration:
• Thermal jump: 5ºC
• COOLING mode operation: 12ºC / 7ºC
• HEATING mode operation: 40ºC / 45ºC
Operation is recommended with the emitters closed.
Note: other control values are allowed once the verifi ed fl ow and
temperatures remain within the operational limits of the unit.
- The total pressure drop in the installation is not known precisely at
start-up, such that it is necessary to adjust the water fl ow with the
regulation valve in order to obtain the desired nominal fl ow.
- Thanks to the pressure drop generated in the hydraulic network,
this regulation valve allows the network’s pressure/fl ow curve to be
overlapped with the pump’s pressure/fl ow curve, thereby obtaining
the nominal fl ow corresponding to the desired operating point.
- The reading of the pressure drop in the plate exchanger (which is
obtained by connecting two pressure gauges on the unit’s inlet and
outlet) will be used as a means of control and adjustment of the
nominal fl ow of water in the installation.
- Next the following procedure must be performed:
• Totally open up the regulation valve.
• Leave the pump running for 2 hours in order to eliminate any
possible solid particles present in the circuit.
• Read the pressure drop of the plate exchanger when starting up
the pump and 2 hours later.
• If the pressure drop has decreased, this means that the mesh fi lter
is obstructed; it must be disassembled and cleaned.
• Repeat until the obstruction is eliminated from the fi lter.
• Once the circuit is free of contaminating elements, read the
pressure drop of the plate exchanger and compare it with the
theoretical pressure drop of the selection.
If the value is greater than the theoretical value, the fl ow is too
high. The pump offers too high of a fl ow from the point of view of
the installation’s pressure drop. In that case, close the regulation
valve one revolution and read the new pressure drop. Perform a
successive approximation by closing the regulation valve until the
nominal fl ow is obtained at the desired operating point.
On the contrary, if the network’s pressure drop is too high with
regards to the available static pressure offered by the pump,
the resulting water fl ow will be reduced and the temperature
difference between the inlet and outlet of the exchanger will be
more signifi cant, which is why it will be necessary to minimize
the pressure drops.
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