Carrier 30GK manual Optional heat reclaim module, Diagnostics Troubleshooting, Displaying alarms

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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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Contents Installation, operation and maintenance instructions 30GK Series PRO-DIALOG ControlTable of Contents Safety Considerations Diagnostics Troubleshooting Avoiding electrocution Safety ConsiderationsGeneral General Description Abbreviations usedHardware Description General Control boardElectronic boards Control boxBoard addresses Red LEDGreen LED Orange LED CCN/clock boardEvaporator entering water temperature sensor Evaporator leaving water temperature sensorCondenser entering and leaving water temperature sensors Heat reclaim condenser entering/leaving water temperaturesDescription Connector Terminal Channel User connectionsAvailable Terminals RemarksSetting UP PRO-DIALOG Plus Control Local interface general featuresMain interface Main Interface Button Name DescriptionStopping the unit in local mode Unit start/stop controlDescription Starting unit and selecting an operating typeModifying the value of a parameter/access to a sub- menu MenusSelecting a menu Selecting a menu itemMenu StructureMenu tree StatusDescription of the Information menu Information Menu Format Units DescriptionDescription of the Temperatures menu Temperatures Menu Format Units CommentsDescription of the Pressures menu Pressures Menu Format Units CommentsDescription of the Setpoints menu Setpoints Menu Format Units Range CommentsDescription of the Inputs menu Description of the Outputs/Tests menu GeneralMenu description Inputs Menu Format Units CommentsFormat Units Description Manual tests Description of the Configuration menu GeneralPassword SUB-MENU Period Configuration SUB-MENU Holiday ConfigurationDescription of the User 1 Configuration sub-menu User 1 Configuration SUB-MENU Format Units Default CommentsDate & Time Configuration SUB-MENU Format Comments Description of the User 2 Configuration sub-menuDescription of Date and Time configuration sub Menu Typical timer program Description of the Holidays sub-menusDescription of the Broadcast sub-menu Item # Format CommentsDescription of the Alarms menu Description of the Alarms History menuBroadcast Configuration SUB-MENU Item # Format Comments Alarms Menu Item # Format DescriptionDescription of the Runtimes 1 menu Maintenance menu descriptionRuntime menu description Description of the Runtimes 2 menu Chilss Contact Type Mode Shutdown PRO-DIALOG Plus Control OperationStart/stop control Heating/cooling selectionEvaporator water pump control Control interlock contact Condenser water pump controlEvaporator heater control Control pointDemand limit by 0-10 V d.c. signal Demand limitCapacity control Determining the lead circuitSlave compressor start-up sequence Controlling the EXVHead pressure control on air-cooled units Head pressure control on water-cooled unitsMaster/slave assembly High pressure load shedding functionPumping down Controlling Pro-Dialog Plus units with a System ManagerDiagnostics Troubleshooting Displaying alarmsResetting alarms Optional heat reclaim moduleAlarm codes Alarm Code DescriptionsCCN Compressor faults 6.4.1.1 General DGT only for units with low-temperature optionCompressor protection devices Starter Guard

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