Cooling Unit Not Working Properly - Cebora SYNSTAR 270 T Manual De Reparaciones

3�3�13 Cooling unit not working properly�
When the power source is turned on, panel board (47) checks that the cooling unit is connected using a signal
provided by the jumper between terminals 1 and 2 of the connector (9) on the cooling unit (Fig. 3.3.13).
With connector (9) disconnected, or the jumper open, the cooling unit is disabled and the type of operation cannot be
selected from the control panel; if the cooling unit is already enabled, the power source locks and the corresponding
error code is displayed.
COOLING UNIT POWER SUPPLY TEST
□ Power board (56), terminals J-L1 - J-L3 = 220 VAC, with power source powered.
COOLING UNIT CONNECTED TEST (see connector map section 5.7).
□ Power board (56), connector J4, terminals 3(+) - 4(-) = 0 VDC, unit connected; +24 VDC unit disconnected or wiring
interrupted.
PUMP TEST (26) (see wiring diagram Fig. 3.3.13).
□ Pump terminals (26) on cooling unit, voltage = 220 VAC, with cooling unit enabled.
□ With the power source off, temporarily disconnect wires of pump (26) from the terminal block and check resistance
at terminals of pump (26) (motor winding resistance). Correct value = 22 ohm, approximately.
□ Check integrity and connection of start-up capacitor of motorised pump (26), located beside pump motor (26).
FANS (2) TEST
□ Terminals of fans (2) on cooling unit, voltage = 220 VAC, with cooling unit enabled.
□ With the power source off, temporarily disconnect the wires of fan (2) from the terminal block and check the resi-
stance between the terminals of fan (2) (windings of fans (2)). Correct value = 750 ohm, approximately.
PRESSURE SWITCH (23) TEST (Fig. 3.3.13 and connector map section 5.6).
□ Power board (56), connector J4, terminals 1(+) - 4(-) = 0 VDC, approximately, with pump (26) running (pressure swi-
tch contact closed = sufficient pressure); +24 VDC, with power source on and pump (26) stopped (pressure switch
contact open = insufficient pressure).
3302355
NOTE
EN
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