Friedrich HEAT PUMPS manual Digital Control Diagnostics and Test Mode

Page 24

920-087-04

Digital Control Diagnostics and Test Mode

Diagnostics

The Friedrich Smart Center continuously monitors the PTAC unit operation and will store service codes if certain conditions are witnessed. In some cases the unit may take action and shut the unit off until conditions are corrected.

To access the error code menu press the ‘Heat’ and ‘High Fan’ buttons simultaneously for three seconds. If error codes are present they will be displayed. If multiple codes exist you can toggle between messages using the temp button. To clear all codes press the temp button for three seconds while in the error code mode. To exit without changing codes press the ‘Low Fan’ button.

The chart below lists the possible error codes and their description:

Test Mode

For service and diagnostic use only, the built-in timers and delays on the PTAC may be bypassed by pressing the ‘Cool’ and ‘Low Fan’ buttons simultaneously for three seconds while in any mode to enter the test mode. TE will be displayed when entering test mode, and DE will be displayed when exiting. The test mode will automatically be exited 30 minutes after entering it or by pressing the ‘Cool’ and ‘Low Fan’ buttons simultaneously for three seconds.

Error

Code Translation

Action Taken by Unit

 

Possible Cause

Code

 

 

 

 

 

01

NOT USED

NONE

 

 

 

An extreme low voltage condition

Shut down unit. Display Error code and flash.

Inadequate power supply

02

exists <198V for 230V units and

Once voltage rises to normal level system power

Defective breaker

 

<239V for 265V units.

is restored.

Blown fuse

 

 

 

 

 

03

Return air thermistor sensor open

Set return air sensor = 75°F. Alternate flash set

Defective sensor

or short circuit

point and error code. Leave unit running.

 

 

 

 

 

 

 

 

04

Indoor coil thermistor sensor open

Set ID coil temp = 40°F. Alternate flash set point

Defective sensor

Or short circuit

and error code. Leave unit running.

 

 

 

 

 

 

 

 

 

Outdoor coil thermistor sensor

Set OD coil temp = 20°F. Alternate flash set point

Defective sensor

05

and error code. Automatically change over to

open Or short circuit

 

Electric heat Mode only. Leave unit running.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Dirty coil

 

If O.D. coil Temperature > 175 Deg

Alternate flash set point and error code. Shut unit

Fan motor failure

06

F for 2 consecutive minutes. (Heat

down for 5 minutes, then try again 2 times, if fails

Restricted air flow

 

Pump models only)

the 3rd time, then shut down unit.

Non-condensables in

 

 

 

 

 

 

 

refrigeration system

 

 

 

 

 

 

 

Alternate flash set point and error code. Continue

Dirty filters

 

 

Dirty coil

 

 

fan operation while the compressor is locked out

 

 

Fan motor failure

07

I.D coil temperature <30 Deg F for

until the indoor coil thermistor reaches 45° F, and

2 consecutive minutes.

then energize the compressor. However, com-

Restricted airflow

 

 

 

pressor must still wait a lockout time of 180 to 240

Improper refrigerant charge

 

 

seconds.

 

 

Restriction in refrigerant circuit

 

 

 

 

 

 

 

 

10

Room Freeze Protection triggered

Alternate flash set point and error code. Keep unit

Room temperature fell below 40°F

running.

 

 

 

 

 

 

 

 

 

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Contents Ptac Table of Contents Model Number Code Ptac Installation Recommendations Building ElevationFriedrich Digital Control Features Digital TemperatureHeat Pump Mode Installation Instructions PXDR10 Drain Kit Drain Kit Location and InstallationInternal Drain optional for new construction External Drain for new construction or unit replacement Drain Tube InstallationCover Plate Installation Drain Kit InstallationWall Sleeve Installation Instructions Pdxws Typical Wall Sleeve InstallationDimensions Lintel InstallationSection II Deep Wall Installation Pxwe Extension InstallationWall Sleeve Extension Sealant Locations Installation Instructions Model Pxga Standard Grille Standard GrillePower Cord Information 230/208V models only Electrical Rating Tables15/20A Lcdi Device 30A Lcdi DeviceInstallation Checklist Section III Chassis InstallationWall sleeve Wall sleeve flange Chassis flange and gasket Dip Switch Setting Factory Dip Switch ConfigurationDigital Control User Input Configuration Digital Control Operation Control board with optional Pdxrt escutcheon kit installed Remote Thermostat and Low Voltage Control ConnectionsRemote Thermostat Fresh Air Vent Control Air Discharge GrilleDesk Control Terminals Auxiliary Fan ControlStart-up Checklist Appendix a Electrical Wiring for 265 Volt Models Line Voltage ConnectionsRoutine Maintenance ComponentsBasic Troubleshooting Techniques Environmental Effects Cooling ModeEnvironmental Effects Heating Mode Insufficient Maintenance and InspectionDigital Control Diagnostics and Test Mode DiagnosticsTest Mode Friedrich Ptac Accessories Pxse Friedrich Air Conditioning Company 920-087-04

HEAT PUMPS specifications

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