Carrier 30GK manual Optional heat reclaim module, DIAGNOSTICS - TROUBLESHOOTING 6.1 - General

5.21 - Optional heat reclaim module

Change-over procedure from cooling mode to heat reclaim mode:

•Start-up of the condenser pump

•Verification of the condenser flow switch control contact. If this remains open after one minute of condenser pump operation, the circuit remains in cooling mode and alarm 79 for circuit A (alarm 80 for circuit B) will be activated.

•As soon as the saturated condensing temperature reaches 30°C, the pumpdown sequence is activated.

•Pumpdown: closing of the cooling mode coil shutoff valve. Opening of the drain valve, closing of the EXV valve.

•When the pumpdown pressure reaches the end of the pumpdown threshold, the pumpdown valve is closed and the heat reclaim function is effective.

6 - DIAGNOSTICS - TROUBLESHOOTING

6.1 - General

The PRO-DIALOG Plus control system has many fault tracing aid functions. The local interface and its various menus give access to all unit operating conditions. The test function makes it possible to run a quick test of all devices on the unit. If an operating fault is detected, an alarm is activated and an alarm code is stored in the Alarm menu.

6.2 - Displaying alarms

The alarm LEDs on the summary interface (see section 4.1) give a quick display of the status of each circuit and the unit as a whole.

•A flashing LED shows that the circuit is operating but there is an alarm.

•A steady LED shows that the circuit has been shut down due to a fault.

The Alarm menu on the main interface displays up to 5 fault codes that are active on the unit.

6.3 - Resetting alarms

When the cause of the alarm has been corrected the alarm can be reset, depending on the type, either automatically on return to normal, or manually when action has been taken on the unit. Alarms can be reset even if the unit is running.

This means that an alarm can be reset without stopping the machine. In the event of a power supply interrupt, the unit restarts automatically without the need for an external com- mand. However, any faults active when the supply is inter- rupted are saved and may in certain cases prevent a circuit or a unit from restarting.

A manual reset must be run from the main interface using the following procedure:

RESET OF ACTIVE ALARMS

OPERATION	ITEM NUMBER	ITEM VALUE	PRESS MENU
	2-DIGIT DISPLAY 4-DIGIT DISPLAY BUTTON LED
Hold down the MENU
button until the LED	0
for alarms lights. The
4-digit display shows	0	2 ALArM
the number of active
alarms (2 in this
example).
Press the Enter button	0	rESEt ALArM
until "rESEt ALARrM"
is shown in the 4-digit
display.
Press the Enter button	0	Good
again to validate the		then, 2 AL
reset. "Good" is dis-		then, no ALArM
played for 2 seconds
then, "2 ALArM" and
then, "no ALArM".

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