Manual Aermec MODUCONTROL (page 70 of 184) (English, German, French, Italian, Spanish)

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IMDCFJ. 12.05 6343841_03

Alarms summary table

The units envision two types of malfunction-

ing signals:

• Pre-alarm

• Alarm

The first type is indicated by the flashing

of the red LED on the display, successive

pressing of the bell key allows to display

except for the switch-on of the fixed red

LED. Before rearming the unit, it is recom-

mended to contact the after-sales service.

To rearm the unit, switch it off and back on

again using the stand-by key.

the list of alarms (with index and cause

indicated in the table below). A pre-alarm

remains such for 60 seconds: if after this

time the condition that caused the pre-

alarm has not disappeared, the same

becomes an alarm. The alarms are dis-

played in the same way as the pre-alarms,

ATTENTION:

The pre-alarms can become alarms when:

• A time has passed longer than or equal to 60 seconds, in the pre-alarm condition.

• The maximum number of pre-alarms in one hour (five) has been exceeded. In this case, every successive pre-alarm will be dis-

played directly as an alarm, and as such, will stop the machine until the reason for the same is solved.

Code

Alarm

Code

Pre-alarm

Causes Notes

1 101

Compressor magnet circuit breaker

This signal intervenes if the contact relative to the magnet circuit

breaker switch protecting the MTC compressor opens (Table 2,

contact ID1, clamps M7.1 - M7.2, normally closed)

Fan magnet circuit breaker

Pump magnet circuit breaker

2 102 Fan magnet circuit breaker

This signal intervenes if the contact relative to the magnet circuit

breaker switch protecting the MTV fans opens (Table 2, contact

ID6, clamps M7S.3 - M7S.4, normally closed) This code is dis-

played only if the board is used as a board spare part with SW up

to version 3.6.

3 103 High pressure switch

This signal DOES NOT give the state of the high pressure switch

itself but of the compressor switch. The high pressure switch oper-

ates directly on the compressor switches. If the board commands

compressor switch-on and the switch does not become active

after 3 seconds, this signal occurs. This alarm can also be caused

by an operating defect of the return relay from the compressor

switch to the board (indicated as RAP in the wiring diagrams).

This signal occurs if the compressor switch deactivates during

operation. AP (Table 2, contact ID4, clamps M7.7 – M7.8, normally

closed)

4 104

Flow switch

This signal occurs with the opening of the contact relative to the

differential flow switch or pressure switch; this alarm is not relative

for the first 40" from pump start-up. The machine blocks in alarm

mode when the maximum number of flow switch interventions

allowed (expressed by the set_factory parameter (y): default 5)

is exceeded. If the frost protection in standby mode is activated

(and therefore also the pump), the state of the flow switch is also

controlled. FL/PD (Table 2, contact ID2, clamps M7.3 – M7.4, nor-

mally closed)

Water differential pressure switch

5 105 Low pressure switch

This signal intervenes when the contact relative to the low pres-

sure switch opens (compressor intake). BP (Table 2, contact ID5,

clamps M7S.1 – M7S.2)

6 106 No water inlet probe This signal occurs when the water inlet probe is disconnected

7 107 No water outlet probe This signal occurs when the water outlet probe is disconnected

8 108 Water freezing

This signal occurs when the anti-freeze threshold is reached

(set_installer (6) default: 3°C) from the output water temperature.

The pre-alarm state is exited with outlet water temperature tem-

perature exceeding the set_installer (6) + set_factory (J) (default

3+1=4°C).

The anti-freeze alarm is suspended (in heating mode) for a period

of time equal to 3' (set_factory parameter (H)) from compressor

switch on.

9 109 No pressing line probe

This signal occurs when the pressing line gas probe is absent

10 110 High pressing line gas temperature

This signal occurs when the temperature of the pressing line gas

(SGP probe) exceeds the threshold envisioned by the parameter

(set_factory (6), default 135°C). The pre-alarm state is exited with

set_factory (7) temperature (default 135 – 10 = 125 °C)

11 111

Flow pressure transducer

no compressor

This signal occurs when the compressor flow transducer is absent

and the machine is set as heat pump or the presence of the DCP

is set

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Aermec MODUCONTROL Manual

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