Friedrich 000 BTU'S Electrical Troubleshooting Chart Cooling, 9K BTU, 12K BTU, & 18K BTU

Page 42

ELECTRICAL TROUBLESHOOTING CHART - COOLING

9K BTU, 12K BTU, & 18K BTU

NO COOLING OPERATION

Compressor runs but Blower/Fan doesn't

Yes

24V at t-stat and

control wiring?

Yes

Is Line Voltage present

at Motor Leads?

Yes

Check Capacitor, is

Capacitor Good?

Yes

Motor should run

No

No

No

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Before continuing

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

check for Error

 

 

 

 

 

 

 

 

 

Insure that Fuses

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Codes, see

 

 

 

 

 

 

 

 

 

are good and/or that

 

 

 

 

 

 

electronics control

 

 

 

 

 

 

 

 

 

Circuit Breakers are

 

 

 

 

 

 

diagnostics and

 

 

 

 

 

 

 

 

on and voltage is 208/230

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

test mode, page 15

 

 

 

 

 

 

 

 

 

O.K.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Set thermostat to

 

 

 

 

Nothing operates,

 

 

 

 

 

 

 

 

 

"Cool," and the Temp.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

entire system

 

 

 

 

 

 

 

 

 

below the present

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

appears dead

 

 

 

 

 

 

 

 

 

Room Temp.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

O.K.

No

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Line voltage present

 

 

 

 

 

 

 

 

 

Compressor and Fan

 

 

 

 

 

 

 

 

Fan runs but

 

 

 

Motor should now

 

 

 

 

 

at the Transformer

 

 

 

 

 

 

 

 

 

 

 

Primary

No

 

 

Compressor doesn't

No

 

operate

 

 

 

 

 

 

 

 

 

Yes

 

 

Yes

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

24 Volts at

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

See Refrigerant Circuit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

“R” Terminal on board

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

diagnosis if unit still is

 

 

 

 

 

 

 

 

 

 

 

 

 

 

not cooling properly

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24 Volts present at

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Y terminals on

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

t-stat and board?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

208/230 Volts present

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Defective t-stat

 

 

 

 

 

 

 

 

 

 

at #1 relay on board?

No

 

 

defective control wiring

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

or transformer

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

Problems indicated

 

 

 

 

 

 

 

 

in Blower Relay

 

 

 

 

 

 

 

 

of board

 

 

Supply Circuit

 

Is Locked Rotor

 

 

 

 

problems, loose

 

 

 

 

 

 

 

 

Connections, or bad

 

Voltage a minimum of

 

 

No

 

 

 

 

Relays/Board

197 Volts?

 

Replace Capacitor

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace Capacitor

 

Are Capacitor and (if

 

 

 

 

 

 

 

 

 

and/or Start Assist

 

so equipped) Start

 

 

 

 

Device

No

Assist good?

 

 

 

 

 

 

 

 

 

 

Possible motor

 

 

 

 

 

 

Yes

 

problem indicated.

 

 

 

 

 

 

 

Check motor

 

 

 

 

 

 

 

 

thoroughly

 

 

 

 

 

 

 

 

 

 

Allow ample time

 

Have System

 

 

 

 

 

 

 

 

 

for pressures to

No

Pressures Equalized?

 

 

 

 

equalize

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

Possible Compressor

 

 

 

 

 

 

 

 

problem indicated.

 

Compressor should

 

 

No

 

 

 

 

See Compressor

 

run

 

 

 

 

Checks

 

 

 

 

 

 

 

 

 

 

 

Check Supply Circuit’s jumper at transformer. If okay, replace board

Problems indicated with

Control Transformer replace board

Problems indicated with

Room Thermostat or

Control Wiring

Replace board

Yes

Compressor and fan

motor should now

operate

Yes

See Refrigerant

Circuit Diagnosis if

unit still is not cooling

properly

40

Image 42
Contents Single Package Vertical Air Conditioning System Technical Support Contact Information Table of Contents Important Safety Information Your safety and the safety of others are very importantRefrigeration System Hazards Introduction Property Damage HazardsSerial Number Identification Guide Chassis Specifications Electric Heat DataExtended Cooling Performance VEA Extended Cooling PerformanceVEA/VHA09-24 VEA Extended Cooling Performance Electrical Requirements Electric Shock HazardRemote Thermostat and Low Voltage Control Connections RT5 Two speed fan RT4 One speed fanThermostat Connections Electronic Control Board Features Quiet Start/StopElectronic Control Configuration Electronic control error codes diagnostics and test mode DiagnosticsTest Mode Power On and Off Features on the Electronic Control Cool mode control features for cool with electric heat units Compressor operation depends on t-stat settings Component description / A-Series specifications VERT-I-PAK Single Packaged Vertical AIR ConditionersExternal Static Pressure Indoor Airflow Data Capacitor Check with Capacitor Analyzer Components TestingCapacitors Capacitor ConnectionsComponents Testing Heater Elements and Limit SWITCHES’ SpecificationsDrain PAN Valve Refrigeration Assembly Refrigeration Sequence of OperationService CUT/SEVER HazardEquipment Must be Capable Sealed Refrigeration System RepairsEquipment Required Risk of Electric ShockMethod Of Charging / Repairs Burn HazardFreeze Hazard Undercharged Refrigerant Systems Overcharged Refrigerant SystemsRestricted Refrigerant System Check Valve Hermetic Components CheckMetering Device Capillary Tube SystemsReversing Valve DESCRIPTION/OPERATION Testing the Coil Checking the Reversing ValveFire Hazard Procedure For Changing Reversing ValveTouch Test in Heating/Cooling Cycle Explosion HazardCompressor Checks Single Phase Resistance Test Ground TestChecking Compressor Efficiency Compressor Replacement Recommended procedure for compressor replacementHigh Temperatures Rotary Compressor Special Troubleshooting and Service Blower Wheel / Housing / Condenser FAN / Shroud Routine MaintenanceCoils and Base PAN Excessive Weight Hazard AIR FilterFront Cover Routine MaintenanceSleeve / Drain Condensate Disposal SystemElectrical Troubleshooting Chart Cooling 9K BTU, 12K BTU, & 18K BTUElectrical Troubleshooting Chart Cooling 24K BTU Circuit Breakers areElectrical Troubleshooting Chart Heat Pump Heat Pump ModeTroubleshooting Chart Cooling Troubleshooting Chart HeatingVEA 09/12/18 with 2.5 KW, 3.4 KW or 5KW Electric HeatVHA 09/12/18 with 2.5 KW, 3.4 KW or 5KW Cool with Electric Heat Heat Pump with Electric Heat Cool with Electric Heat Heat Pump with Electric Heat Outdoor Coil Return Air Indoor Coil Accessories Wall PlenumDrain PAN Friedrich Air Conditioning Company Technical Support Contact Information Friedrich AIR Conditioning CO