31
Installazione
Funzionamento
Manutenzione
Unità ad alta precisione Jupiter
Unità a espansione diretta
JDAC / JUAC / JDAV / JUAV / JDWC / JUWC / JDWV / JUWV
Taglie: 0115 – 0125 – 0133 – 0135 – 0150 – 0160
Unità ad acqua refrigerata
JDCC / JUCC / JDCV / JUCV
Taglie: 0020 – 0025 – 0030 – 0040 – 0060
PKG-SVX24B-IT
REFRIGERANT CIRCUIT
PROBLEM
POSSIBLE CAUSE
CHECK/CORRECTIVE ACTION
HiGH CoMPreSSor
DiSCHArGe PreSSUre
A) there is non-condensable air or gas in the
refrigerant circuit, with bubbles in the flow sight
glass; excessive sub-cooling.
evacuate the refrigerant circuit and recharge.
B) The air flow to the remote heat exchanger is
insufficient or too warm.
1) Check the fan operation and rotation direction
in the remote heat exchanger.
2) Check to see if the exchanger is dirty and
if necessary remove any obstructing material
(leaves, paper, seeds, dust, etc.) with a blast of
compressed air or a brush;
3) in the external unit check for obstructions in
the air flow and in the recirculation of the cooling
air.
4) Check that the temperature of the cooling air
is within the planned limits.
C) The water flow to the condenser is insufficient
or too warm.
1) Check the condenser water flow, pressure and
temperature in the closed circuit water system.
2) Check the setting and function of the
pressostatic regulation valve.
D) there is too much refrigerant in the circuit; the
condenser is partially flooded. The refrigerant
subcooling is too high at the condenser outlet
remove some refrigerant from the circuit.
e) the discharge valves are partially closed
Check the opening of the valves.
AP
HiGH PreSSUre
SWitCH interVeneS
(high compressor
discharge pressure)
A) the condensing pressure control system is
not functioning efficiently.
1) Check the fan function of the condenser and
of the relative protection; re-set or replace the
faulty fans.
2) Check the setting and function of the fan
speed regulator of the remote condenser.
B) the system discharge pressure is too high
See “HiGH CoMPreSSor DiSCHArGe
PreSSUre”.
LoW CoMPreSSor
DiSCHArGe PreSSUre
A) the condensing pressure control system is
not functioning efficiently.
Check the setting and function of the condenser
fan pressure switch or speed regulator.
B) The water flow to the condenser is too high or
too cold.
1) Check the condenser water flow and
temperature;
2) Check the setting and function of the pressure
regulating valve (if fitted).
3)Fit a pressure regulating valve to control the
water pressure according to the condensing
pressure.
C) the suction pressure is too low.
See “LoW CoMPreSSor SUCtion
PreSSUre”.
HiGH CoMPreSSor
SUCtion PreSSUre
A) the thermal load is too high.
Check the room’s thermal load; check in case
of over dehumidification, check the air flow and
conditions of external air, check the external air
infiltration.
B) the discharge pressure is too high.
See “HiGH CoMPreSSor DiSCHArGe
PreSSUre”.
C) there is an overcharge of refrigerant in the
circuit.
remove some refrigerant from the circuit.
D) there is a return of liquid refrigerant to the
compressor intake
Check that the super heat setting of the
thermostatic valve is correct.
PROBLEM
POSSIBLE CAUSE
CHECK/CORRECTIVE ACTION
ABSent or LoW Air
FLoW
A) there is no power to the fans.
Check the power supply to the fans
B) The air filters are clogged (dirty filter alarm
enabled).
1) Shake the dust out of the cartridge and clean
with a vacuum cleaner. Replace the filter if it is
completely blocked.
2) Check the correct setting of the dirty filter
pressure switch PFS.
C) The air flow is obstructed.
Check that the air flow is not obstructed, not
even partially.
D) the fans’ thermal protection intervenes.
Check the resistance of the fan motor
windings. re-set then measure the voltage and
absorption.
E) The power supply to the fans is insufficient.
Change the power supply voltage to the fans.
(See paragraph. ‘Setting and adjustment).
F) the air distribution output pressure is too
high.
Check the air pressure distribution (ducts,
ceiling or floor plenum, grilles).
