Fujitsu FO20R Series Installation Instructions Manual Download Page 69

Page: 69 / 76

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6<03720

POSSIBLE CAUSE

5(0('<

Poor system control

using an EXV

Bad pressure reading

Check transducer wiring.

Suction thermistor in wrong location

Relocate thermistor.

Bad suction thermistor

Replace thermistor.

Improper superheat setting (less than 5°F [-2.8°C]) Adjust EXV SH setpoint dipswitches and validate

valve operation.

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6<03720

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5(0('<

High Superheat, Low

Suction Pressure

(superheat over

15°F [8.3°C])

Moisture freezing and blocking valve

Recover charge, replace filter-drier, evacuate system,
recharge.

Dirt or foreign material blocking valve

Recover charge, replace filter-drier, evacuate system,
recharge

Low refrigerant charge

Correct the charge.

Vapor bubbles in liquid line

Remove restriction in liquid line. Correct the refrigerant
charge.

Remove noncondensible gases.

Size liquid line correctly.

Verify suction thermistor resistance is correct and
properly attached and insulated to the vapor line.

Incorrectly sensing vapor line temperature

Replace suction thermistor assembly.

Suction thermistor incorrectly calibrated.

If harness has a short, replace harness

If gauge pressure measurement and the converted
voltage readings at the control are the same, replace
the control.

EXV is stuck

If EXV will not open, validate EXV wiring harness and
rotor resistance between the black wire and the
other 4 wires.

Replace with correct valve.

Undersized EXV

After verifying lack of connectivity, replace the pressure
transducer or harness.

Vapor pressure measured incorrectly.

If gauge pressure measurement and the converted
voltage readings at the control are different replace
pressure transducer

Remove EXV from the system and purge with nitrogen,
replace filter drier, and recharge.

If none of the above rectifies the issue, replace EXV
and filter drier and recharge.

VSODC dc circuit failed

Verify 5Vdc to pressure transducer is present. If not,
replace VSODC.

High superheat adjustment

Change the superheat offset dip switches to increase
superheat.

9.12 Service Analyzer Charts (cont.)

9.0 DIAGNOSTICS & TROUBLESHOOTING

Diagnostics

Summary of Contents for FO20R Series

Page 1: ...UALIFIED LICENSED SERVICE PERSONNEL FOR PROPER INSTALLATION ADJUSTMENT AND OPERATION OF THIS UNIT READ THESE INSTRUCTIONS THOROUGHLY BEFORE ATTEMPTING INSTALLATION OR OPERATION FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN IMPROPER INSTALLATION ADJUSTMENT SERVICE OR MAINTENANCE POSSIBLY RESULTING IN FIRE ELECTRICAL SHOCK PROPERTY DAMAGE PERSONAL INJURY OR DEATH FO20R 20 SEER EQUIPPED WITH DIG...

Page 2: ...ƌǇ ŚĂƌŐŝŶŐ ďǇ WƌĞƐƐƵƌĞƐ Ϯϴ ϱ ϴ ϰ ŝŶĂů ŚĂƌŐŝŶŐ ďǇ ŝƋƵŝĚ ƵďĐŽŽůŝŶŐ Ϯϵ ϱ ϴ ϱ ZͲϰϭϬ dĞŵƉĞƌĂƚƵƌĞ WƌĞƐƐƵƌĞ ŚĂƌƚ Ϯϵ ϱ ϵ ŽŵƉůĞƟŶŐ ŶƐƚĂůůĂƟŽŶ Ϯϵ 6 0NORMALSEQUENCEOFOPERATION 30 32 ϲ ϭ ŽŽůŝŶŐ DŽĚĞ ϯϬ ϲ Ϯ KŶͲ ĞŵĂŶĚ ŽŽůŝŶŐ ĞŚƵŵŝĚŝĮĐĂƟŽŶ ϯϬ ϲ ϯ Žǁ ŵďŝĞŶƚ ŽŽůŝŶŐ KƉĞƌĂƟŽŶ ϯϬ ϲ ϰ ĞĂƟŶŐ DŽĚĞ ϯϬ ϲ ϱ ƵƉƉůĞŵĞŶƚĂů ůĞĐƚƌŝĐ ĞĂƚ ƵƌŝŶŐ ĞĂƟŶŐ DŽĚĞ ϯϭ ϲ ϲ ƵĂů ƵĞů ƉƉůŝĐĂƟŽŶƐ Ͳ ĞĂƟŶŐ DŽĚĞ ϯϭ 6 7 Demand Defrost 31 ϲ ϴ ĞƋƵĞŶĐĞ ...

Page 3: ... injury resulting from the use of such unauthorized components accessories or devices This product is not approved for installation at 2000 meters 6561 feet above sea level or higher Installation at higher altitudes may result in control and unit failures due to electrical arc tracking between electrical components on the invertor drive control board Possibly resulting in fire electrical shock pro...

Page 4: ...nce of Quality Installation A quality installation is critical to assure safety reliability comfort and customer satisfaction Strict adherence to applicable codes the information in this installation manual the outdoor unit installation manual and the thermostat installation manual are key to a quality installation Read the entire instruction manuals before starting the installation IMPORTANT This...

Page 5: ...rt and to assure the outdoor unit warranty remains valid an air handler model or indoor coil furnace combination should be selected that is properly matched to the outdoor unit This is especially critical for heat pump systems to assure proper refrigerant charge balance between the cooling and heating modes The recommended approach is to select an air handler or indoor coil and gas furnace that ha...

Page 6: ...LLOW 6 152mm Min OF CLEARANCE ALL SIDES 12 305mm RECCOMMENDED SERVICE PANELS INLET CONNECTIONS HIGH LOW VOLTAGE ACCESS ALLOW 24 610 mm OF CLEARANCE ST A1226 23 00 H W A I R D I S C H A R G E L 3 0 UNIT SPECIFICATIONS Unit Specifications 3 2 Electrical and Physical Data 6020 4820 3620 2420 6020 4820 3620 2420 ...

Page 7: ...ty At pressures above 1 atmosphere a mixture of R 410A and air can become combustible R 410A and air should never be mixed in tanks or supply lines or be allowed to accumulate in storage tanks Leak checking should never be done with a mixture of R 410A and air Leak checking can be performed safely with nitrogen or a mixture of R 410A and nitrogen 4 1 3 Quick Reference Guide for R 410A R 410A refri...

Page 8: ...cal code recommendations and requirements will take precedence Refrigerant piping and wiring should be properly sized and kept as short as possible to avoid capacity losses and increased operating costs Locate the unit where water runoff will not create a problem with the equipment Position the unit away from the drip edge of the roof whenever possible Units are weatherized but can be affected by ...

Page 9: ... away from the living sleeping and recreational spaces of the owner and those spaces on adjoining property To prevent noise transmission the mounting pad for the outdoor unit should not be connected to the structure and should be located a sufficient distance above grade to prevent ground water from entering the unit 4 3 Unit Mounting 4 3 1 Unit Mounting Methods The outdoor heat pump unit may be m...

Page 10: ...36 New Haven 15 MAINE NEBRASKA Bismarck 25 Knoxville 8 La Crosse 32 DELAWARE Caribou 100 Grand Island 30 Fargo 34 Memphis 5 Madison 32 Wilmington 13 Portland 62 Lincoln 20 Williston 25 Nashville 8 Milwaukee 32 GEORGIA MARYLAND Norfolk 29 OHIO TEXAS WYOMING Athens 5 Baltimore 17 North Platte 15 Akron Canton 15 Abilene 6 Casper 10 Macon 8 MASSACHUSETTS Omaha 20 Cleveland 16 Amarillo 10 Cheyenne 15 I...

Page 11: ... long line lengths Variable speed systems present an additional chal lenge due to the fact that the system operates at A SIGNIkCANTLY REDUCED REFRIGERANT lOW RATE FOR A SIG NIkCANT PERCENTAGE OF OPERATING TIME NLY USE THE vapor line sizes listed in Table 2 to assure proper oil return DO NOT oversize vapor line 4 4 2 2 Refrigerant Migration Dur ing Off Cycle Long line set applications can require a...

Page 12: ...versize the vapor line to minimize capacity loss at the expense of proper oil return If the table shows an NR for a particular vapor line diameter and length or if a vapor line diameter is not listed oil return will not be adequate 0RGHO RPSUHVVRU 1DPHSODWH 2LO KDUJH R PO 39 39 39 ƋƵŝǀĂůĞŶƚ ĞŶŐƚŚ ĨŽƌ ŝƚƚŝŶŐƐ Ĩƚ ŵ ŝŶĞ ŝǌĞ ŝŶ ŵŵ ϵϬΣ ŚŽƌƚ ZĂĚŝƵƐ ůďŽǁ ϵϬΣ ŽŶŐ ZĂĚŝƵƐ ůďŽǁ ϰϱΣ ůďŽǁ ŽůĞŶŽŝĚ sĂůǀĞ ŚĞĐŬ sĂ...

Page 13: ...cooled liquid from the indoor unit to the outdoor unit It is important not TO ALLOW THE REFRIGERANT TO lASH INTO SUPERHEATED VAPOR prior to entering the expansion device of the indoor coil or outdoor unit Flashing of refrigerant can occur for the following reasons Low refrigerant charge Improperly selected liquid line size Absorption of heat prior to expansion device Excessive vertical separation ...

Page 14: ... 14 0 4 88 4 88 4 87 25 86 1 85 2 7 2 3 14 0 4 88 4 88 4 87 4 86 4 85 0 1 2 3 14 0 4 88 4 88 4 87 4 86 4 85 2 7 2 3 14 88 4 87 4 85 4 84 4 82 4 81 0 1 2 3 14 88 4 87 4 85 4 84 4 82 4 81 2 7 6 7 14 0 4 88 4 88 4 87 4 87 4 86 0 1 6 7 14 0 4 88 4 88 4 87 4 87 4 86 2 7 2 3 14 87 4 86 4 84 4 82 35 80 0 1 2 3 14 87 4 86 4 84 4 82 4 80 2 7 6 7 14 88 4 88 4 87 4 86 4 85 27 84 0 1 6 7 14 88 4 88 4 87 4 86 ...

Page 15: ...2 37 2 37 2 37 2 9 37 2 8 34 9 3 4 3 27 5 6 3 22 37 2 37 2 37 2 37 2 9 37 2 8 75 5 3 27 5 6 2 37 2 37 2 8 37 2 7 37 2 5 37 2 4 34 9 3 4 3 27 5 6 2 37 2 37 2 8 37 2 7 37 2 5 37 2 4 75 5 44 45 9 3 22 37 2 37 2 37 2 37 2 37 2 9 34 9 3 4 44 45 9 3 22 37 2 37 2 37 2 37 2 37 2 9 75 5 3 27 5 6 2 37 2 9 37 2 7 37 2 5 36 2 3 34 9 3 4 3 27 5 6 2 37 2 9 37 2 7 37 2 5 37 2 3 75 5 44 45 9 2 37 2 37 2 37 2 9 37...

Page 16: ...e liquid refrigerant can be heated to form vapor insulating the liquid line is required Use clean dehydrated sealed refrigeration grade tubing Always keep tubing sealed until tubing is in place and connections are to be made A high quality biflow filter drier is included with all R 410A heat pump units and must be installed in the liquid line upon unit installation When replacing an R 22 system wi...

Page 17: ...ONDITIONED SPACE FOR LONG LINE APPLICATIONS INSULATED VAPOR LINE FULL LENGTH Figure 3 For applications with the outdoor unit and indoor unit on the same level the following is required Insulated liquid line in unconditioned space only Insulated vapor line full length Vapor line should slope toward the indoor unit Reference Figure 3 Follow the proper line sizing maximum linear and equivalent length...

Page 18: ...e and prior to expansion device Verify that the pressure drop is not greater than 50 PSI 345 kPa For elevations greater that 25 8 m a lower sub cooling can be expected Verify there is at least 5ºF 2 8ºC of liquid sub cooling at the indoor coil prior to the expansion device Tubing 4 5 2 2 Outdoor Unit Below Indoor Coil Long Line Set Applications Figure 4 INVERTED TRAP EVEN WITH TOP OF THE COIL REFE...

Page 19: ... oil level adjustments spelled out in this document Insulated vapor line full length Verify at least 5 F 2 8ºC of liquid subcooling at the outdoor unit prior to expansion device in the heating mode 4 5 2 3 Outdoor Unit Above Indoor Coil ŶƐƵůĂƚĞĚ ůŝƋƵŝĚ ůŝŶĞ ŝŶ ƵŶĐŽŶĚŝƚŝŽŶ ƐƉĂĐĞ ĨŽƌ ůŽŶŐ ůŝŶĞ ĂƉƉůŝĐĂƚŝŽŶ ZĞĨĞƌĞŶĐĞ dĂďůĞ Ϯ ĨŽƌ ŵĂǆŝŵƵŵ ůĞŶŐƚŚ ĂŶĚ ǀĞƌƚŝĐĂů ƐĞƉĂƌĂƚŝŽŶ ůŝŵŝƚĂƚŝŽŶƐ ŶƐƵůĂƚĞĚ ǀĂƉŽƌ ůŝŶĞ ĨƵ...

Page 20: ...bing with a clean dry cloth before soldering Clean out debris chips dirt etc that enters tubing or service valve connections Wrap valves with a wet rag or thermal barrier compound before applying heat Braze the tubing between the outdoor unit and indoor coil Flow dry nitrogen into a pressure port and through the tubing while brazing but do not allow pressure inside tubing which can result in leaks...

Page 21: ...t and coil evacuation see Sections 4 7 and 4 8 for evacuation and final leak testing The vapor line must be insulated for its entire length to prevent dripping sweating and prevent performance losses Closed cell foam insulation such as Armaflex and Rubatex are satisfactory insulations for this purpose Use 1 2 12 7 mm minimum insulation thickness Additional insulation may be required for long runs ...

Page 22: ...age thermostat many features and benefits are lost Therefore a conventional 24VAC 2 stage thermostat should only be used in temporary emergency situations until communication issues with the communicating control system are resolved 4 9 2 Digital Control Center Installation The Digital Control Center should be mounted 4 to 5 feet above the floor on an inside wall of the living room or a hallway th...

Page 23: ...e installation manual and the Digital Control Center installation manual for further details on setting up the system and available adjustment options 4 9 4 Conventional 24VAC Thermostat Control Wiring Connections The 20 SEER heat pumps allow the installer to use conventional 24 VAC control wiring and a conventional thermostat for limited unit operation The system will operate as a single stage sy...

Page 24: ...ight DO NOT connect aluminum field wire to the unit line voltage terminal block TYPICAL SINGLE STAGE THERMOSTAT HEAT PUMP WITH AIR HANDLER 4 9 Control Wiring cont 4 10 Power Wiring TYPICAL SINGLE STAGE THERMOSTAT AND DUAL FUEL APPLICATION Nameplate Voltage Operating Voltage Range at Maximum Load Conditions 7OHZL LHOG QVWDOOHG DFWRU 6WDQGDUG LU DQGOHU HDW 3XPS 2XWGRRU 8QLW 7 SLFDO 6LQJOH 6WDJH 7KHU...

Page 25: ...er to the indoor and outdoor units The Digital Control Center or thermostat should be switched to the off position initially Within 45 seconds of power being applied the Digital Control Center should detect the indoor and outdoor units A 0 for Standby Mode will be displayed on the Variable Speed Outdoor Control VSODC IMPORTANT It is recommended to wait at least 12 hours after electrical power is a...

Page 26: ...acity and indoor air flow to allow proper indoor air flow verification and refrigerant charging until the Charge Mode is manually ended There may be a delay before the system actually starts If the system doesn t start cycle power to both the indoor and outdoor units and repeat steps 1 6 8 Note When charging in the heating mode the system will initiate a defrost cycle every 34 minutes if the coil ...

Page 27: ...E AHRI rated CFM may differ slightly from values in the table below The refrigerant charge for all systems should be checked against the Charging Chart located inside the access panel cover WARNING The top of the scroll compressor shell is hot Touching the compressor top may result in serious personal injury CAUTION R 410A pressures are approximately 60 higher 1 6 times than R 22 pressures Use app...

Page 28: ... charging device adjust the refrigerant charge based on the actual line set length If the entire system has been evacuated add the total calculated charge IMPORTANT Charging by weight is not always accurate since the application can affect the optimum refrigerant charge Charging by weight is considered a starting point ONLY Always check the charge by using the Charging Chart and adjust as necessar...

Page 29: ...e Temperature Pressure Chart below to note the corresponding saturation temperature for R 410A at the measured liquid pressure Liquid Saturation Temperature SAT _____ F _____ C 3 Note the liquid line temperature Liq _____ F _____ C as measured from a temperature probe located within 6 15 2 cm outside of the unit on the copper liquid line small line It is recommended to use a calibrated clamp on te...

Page 30: ...ir flow level will respond by ramping up or down as required to meet the building load exactly rather than simply cycling on and off as conventional systems do Should the building load exceed the capacity of the system the inverter will direct the compressor to speed up and operate at greater than 100 capacity Overdrive Mode in an attempt to meet the building load until the maximum compressor spee...

Page 31: ...load The indoor air flow will be forced to operate at the maximum level for the system For 13kW heaters and higher the supplemental electric heat will be energized in two stages as required The compressor and outdoor fan will continue to operate at maximum capacity while supplemental electric heat is energized 6 6 Dual Fuel Applications Heating Mode If the building load should exceed the heat pump...

Page 32: ...irculation speed for 6 minutes 7 The system returns to normal heating operation as directed by the Digital Control Center NOTE Should the outdoor ambient temperature thermistor fail the VSODC will initiate a defrost every 34 minutes of operation when the coil temperature is below 35 F 6 8 Sequence of Operation for Conventional 24VAC Thermostat Controls When the 20 SEER heat pump system is controll...

Page 33: ... speed scroll compressor with a brushless Permanent Magnet motor The compressor is designed to work in conjunction with the Power Inverter Compressor Control and the Variable Speed Outdoor Control to provide capacity modulation 7 5 Discharge Line Thermistor 20 SEER heat pumps are equipped with a discharge line thermistor that is used to measure the compressor discharge temperature This sensor s le...

Page 34: ...ed to indicate if the EXV is in the process of opening or closing The following is a list of features on the VSODC and location of each 1 Thermostat Terminals 2 Communication wire terminals 3 Modbus unitary inverter communication connection 4 Outdoor PSC Fan relay connections 5 Outdoor ambient thermistor connection 6 Coil sensor EVAPIN and suction thermistor OST connections 7 Liquid line thermisto...

Page 35: ... for each outdoor unit 7 0 COMPONENTS CONTROLS 7 6 5 Superheat Offset DIP Switch Settings DIP Switch Bank on the Right Although the factory programmed superheat setting is considered to be the most efficient setting for each unit installation conditions can effect the measurement of superheat on the VSODC For this reason the following dip switch settings have been provided to enable flexibility fo...

Page 36: ...requested compressor speed 3 MAXIMUM Speed 2 INTERMEDIATE Speed 1 MINIMUM Speed SH Superheat Measurement The display is to show the following options HI Superheat is more than 5 F 2 8ºC above SH_SP hI Superheat is between 1 5o F 0 8o C and 5 F 2 8ºC above SH_SP 00 Superheat is within 1 5 F 0 8ºC of SH_SP lo Superheat is between 1 5 F 0 8ºC and 5 F 2 8ºC below SH_SP LO Superheat is 5 F 2 8ºC or mor...

Page 37: ... pole removable stator for serviceability An internal check valve is provided that assures unrestricted flow in the reverse direction when the system is operating in the cooling mode There are 3 ferrite rings and one filter on all models The ferrite rings are similar in purpose to the choke whereas they create an inductive field around the assembled wires but they do not filter the signals The fer...

Page 38: ...oor ambient temperature is utilized by the VSODC and Digital Control Center for several control functions and is displayed on the Digital Control Center 7 13 Outdoor Fan Motor 20 SEER heat pumps are equipped with variable speed outdoor fans controlled by a pulse width modulated signal PWM from the Variable Speed Outdoor Control The fan speed is selected to optimize performance based on compressor ...

Page 39: ... by the VSODC to calculate superheat and adjust the outdoor EXV to maintain the correct superheat level IMPORTANT The clamp on the suction line thermistor securely attaches to the tube between the outdoor coil and reversing valve The thermistor must be located between the 10 and 2 o clock position with a corrosion resistant stainless steel clip Insulation is factory installed over the suction line...

Page 40: ...e Inverter will gradually increase the compressor RPM until the compressor returns to normal speed based on the capacity demand Should the discharge temperature rise to 235 F 113ºC again the Inverter to repeat the speed reduction cycle to maintain a temperature below 235 F 113ºC 8 5 High Discharge Pressure The High Pressure Control HPC limits the compressor discharge pressure to a safe level to pr...

Page 41: ...rmal system operation will resume and the fault codes will be cleared from the VSODC and Digital Control Center displays 6 If after 5 minutes cooling or heating demand persists and the pressure has not reached reset conditions the outdoor fan motor will be shut down Once the pressure reaches reset conditions after the 5 minute delay normal system operation will resume 8 8 Overcurrent and Current I...

Page 42: ... failed See the table below for the default operation for a sensor failure Exiting an Active Protection Lock Out mode can be accomplished by disconnecting electrical power to both the indoor and outdoor units for 1 minute and then restoring power Keep in mind there was a reason for the lock out so the fault code on the Variable Speed Outdoor Control VSODC or Digital Control Center should be read t...

Page 43: ...played on the dual 7 segment LEDs and a call for unit operation is present the TEST mode causes 1 A t to display momentarily on the dual 7 segment display 2 The compressor will start and the outdoor fan will operate 3 The display will change to a steady c C h or H to show the current demand for unit operation NOTICE If a call for unit operation is present at the end of the TEST mode the unit will ...

Page 44: ...VVSPUN K YPUN HU HJ P L HU P ZOVY J JSL PTLY VY TPUPT T Y U PTLY HP U PS PTLY OHZ L_WPYLK VY WYLZZ OL I VU V KLMLH ZOVY J JSL KLSH K LMYVZ J P L OL UP PZ UKLYNVPUN H KLMYVZ J JSL 5VYTHS VWLYH PVU 9 4 Status and Diagnostic Codes 9 0 DIAGNOSTICS TROUBLESHOOTING Diagnostics O PYZ HNL LH 7 TW W TW 5VYTHS VWLYH PVU FLASHING O U P ZOVY J JSL PTLY TPU LZ VY TPUPT T Y U PTLY ZLJVUKZ HJ P L OLH W TW K YPUN...

Page 45: ...lts or in the Fault History and will be time and date stamped VSODC fault code will be displayed on the VSODC Variable Speed Outdoor Control 9 4 Status and Diagnostic Codes cont ŚĞĐŬ ĂŶĚ ZĞƉůĂĐĞ ŚŽŬĞ Ĩ ƌĞƉůĂĐĞŵĞŶƚ ĐŚŽŬĞ ĂŶĚ ŚĂƌĚ ƌĞƐĞƚ ĚŽĞƐŶ ƚ ƐŽůǀĞ ƌĞƉůĂĐĞ ĚƌŝǀĞ 9 0 DIAGNOSTICS TROUBLESHOOTING Diagnostics ...

Page 46: ...rol Center under Service window Current Faults or in the Fault History and will be time and date stamped VSODC fault code will be displayed on the VSODC Variable Speed Outdoor Control Diagnostics 9 0 DIAGNOSTICS TROUBLESHOOTING 9 4 Status and Diagnostic Codes cont ...

Page 47: ...will be displayed at the Digital Control Center under Service window Current Faults or in the Fault History and will be time and date stamped VSODC fault code will be displayed on the VSODC Variable Speed Outdoor Control Diagnostics 9 0 DIAGNOSTICS TROUBLESHOOTING ...

Page 48: ...rol Center under Service window Current Faults or in the Fault History and will be time and date stamped VSODC fault code will be displayed on the VSODC Variable Speed Outdoor Control 9 0 DIAGNOSTICS TROUBLESHOOTING 9 4 Status and Diagnostic Codes cont Diagnostics ...

Page 49: ...will be displayed at the Digital Control Center under Service window Current Faults or in the Fault History and will be time and date stamped VSODC fault code will be displayed on the VSODC Variable Speed Outdoor Control 9 0 DIAGNOSTICS TROUBLESHOOTING Diagnostics ...

Page 50: ...unded or open or outside of acceptable range The error codes below will be displayed at the Digital Control Center under Service window Current Faults or in the Fault History and will be time and date stamped VSODC fault code will be displayed on the VSODC Variable Speed Outdoor Control 9 0 DIAGNOSTICS TROUBLESHOOTING 9 4 Status and Diagnostic Codes cont Diagnostics ...

Page 51: ...ill be displayed at the Digital Control Center under Service window Current Faults or in the Fault History and will be time and date stamped VSODC fault code will be displayed on the VSODC Variable Speed Outdoor Control 9 0 DIAGNOSTICS TROUBLESHOOTING Diagnostics 3 ...

Page 52: ... this fault occurs before VSODC will restart the compressor If this fault occurs 3 times during a single call for operation the VSODC will lock out the compressor to keep it from continuing to operate and flash an L on the dual 7 segment LEDs followed by a 15 IMPORTANT This mode of active protection must be manually reset L15 DC Bus Over Voltage A904_O Inverter Fault If the inverter detects an ove...

Page 53: ... is a 5 minute delay after this fault occurs before VSODC will restart the compressor If this fault occurs 3 times during a single call for operation the VSODC will lock out the compressor to keep it from continuing to operate and flash an L on the dual 7 segment LEDs followed by a 15 IMPORTANT This mode of active protection must be manually reset L15 Current Imbalance T911_O Inverter Fault If the...

Page 54: ... to keep it from continuing to operate and flash an L on the dual 7 segment LEDs followed by a 15 IMPORTANT This mode of active protection must be manually reset L16 Microprocessor Fault A912_O Inverter Fault If the inverter identifies a faulty microprocessor the inverter will automatically shut the compressor off and keep it from operation The VSODC will lock out the compressor to keep it from co...

Page 55: ...ing to operate and flash an L on the dual 7 segment LEDs followed by a 16 IMPORTANT This mode of active protection must be automatic reset once the discharge line thermistor fault is corrected L16 Discharge Temperature T916_O Inverter Fault If the VSODC detects the compressor discharge temperature is greater 235 F 113ºC the VSODC will automatically begin to slow the compressor operation until the ...

Page 56: ...There are two scenarios that will cause active protection during an LPC trip when the unit is in the heating mode Active Protection With Hard Lockout If the LPC opens three 3 times within 120 minutes for the same call for heating operation the VSODC will lock out the compressor to keep it from continuing to operate and flash an 21 on the dual 7 segment LEDs followed by a L IMPORTANT This mode of a...

Page 57: ...ater than the designed operating envelope permits the inverter will automatically begin to slow the compressor operation If this fold back is not successful in bringing the compressor back into the designed operating envelope then the compressor will be kept from operating IMPORTANT It is common during startup and shutdown for the compressor to venture outside the designed operating envelope It is...

Page 58: ... identifies issue s reading the model data from the memory card the VSODC will automatically shut the compressor off and keep it from operation When this fault occurs the VSODC will lock out the compressor to keep it from operating and flash an L on the dual 7 segment LEDs followed by a 93 IMPORTANT This mode of active protection must be manually reset D1 Memory Card Configuration Data Write Failu...

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Page 62: ...efrost Sensor in Wrong Location Wrong Defrost Timer Setting Reversing Valve Stuck Welded Reversing Valve Relay on Control Board Loose Defrost Sensor Check Coil Sensor Connector Defrost System Inadequate Indoor Airflow Inadequate Indoor Airflow Dirty or Restricted Outdoor Coil Bad Outdoor Motor or Fan Dip Switch 1 on SW2 is Off Diagnostics 9 0 DIAGNOSTICS TROUBLESHOOTING 9 9 Defrost Mechanical Chec...

Page 63: ...ivision Addition and Subtraction Our formula doesn t have any Exponents so we can eliminate that Also there is no Addition Multiplication and Division similar to Addition and Subtraction priority comes to whichever is first in the formula In our case this doesn t matter because the Division is within the parentheses which comes first anyway Starting with some arbitrary numbers completion of the fo...

Page 64: ...de with the sensor disconnected from the control board Again comparing the results must be done against a calibrated tester A glass of water mixed completely with ice chips and given several minutes to settle should measure 32 to 32 4ºF Apply resistance measurements to the chart found below and compare to the control 32º will have a resistance 1 of 32 650 Ohms In the event Celsius is being used th...

Page 65: ...correct voltage Improperly sized unit Refrigerant undercharge or overcharge LPC or HPC Cycling At inverter input terminals voltage must be between 187 252 VAC when unit is operating Adjust charge per charging chart Registers sweat r OW INDOOR AIRlOW Increase speed of blower or reduce restriction 2EPLACE AIR kLTER High head low vapor pressures Restriction in liquid line expansion device or kLTER DR...

Page 66: ... feeding unit Correct and complete diagnosis High line voltage Power company problem Report problem High head pressure Overcharge Check system charge Dirty heat pump coil Clean coil Faulty or wrong size heat pump fan motor Replace fan motor Faulty fan blade or wrong rotation Replace fan blade Replace with correct rotation motor Recirculation of air Correct installation Additional heat source Check...

Page 67: ...tage to contactor coil Compressor control circuit High pressure switch Low pressure cut out Ambient thermostat Stater heat is active No voltage at input to inverter Blown fuses or tripped circuit breaker Check for short in wiring or unit Improper wiring Recheck wiring diagram Improper voltage High voltage Wrong unit Power supply problem Low voltage Wrong unit Power supply problem Wiring undersized...

Page 68: ...e to improve oil return Low suction pressure Low charge Check system charge Refrigerant leaks Repair and recharge Cold noisy compressor Slugging Dilution of oil with refrigerant Observe piping guidelines Noisy compressor Migration Check stater heat and compressor thermistor Cold sweating compressor Flooding Check system charge Low load Dirty coil Wrong duct size Restricted duct Thermostat setting ...

Page 69: ...por line Incorrectly sensing vapor line temperature Replace suction thermistor assembly Suction thermistor incorrectly calibrated If harness has a short replace harness If gauge pressure measurement and the converted voltage readings at the control are the same replace the control EXV is stuck If EXV will not open validate EXV wiring harness and rotor resistance between the black wire and the othe...

Page 70: ...ine with insulation Change the superheat offset dip switches to increase superheat Verify suction thermistor resistance is correct and properly attached and insulated to the vapor line Incorrectly sensing vapor line temperature Replace suction thermistor assembly Suction thermistor incorrectly calibrated If harness has a short replace harness If gauge pressure measurement and the converted voltage...

Page 71: ... suction line Ensure sensing bulb is located properly Check for blocked distributor tubes Recover refrigerant change filter drier evacuate system and recharge Moisture freezing and partially blocking EXV Connect pressure transducer in proper location or remove any blockage Pressure transducer not connected or plugged Install suction line thermistor in correct horizontal clean section of copper pip...

Page 72: ...on Pressure Transducer or Faulty Measurement Low Low High Poorly Insulated Indoor Vapor Line Thermistor or Bad Thermistor High High Low HEATING MODE TROUBLESHOOTING TIPS SYSTEM PROBLEM INDICATORS DISCHARGE PRESSURE SUCTION PRESSURE SUPERHEAT Normal 5 15 F 2 8 8 3 C SUBCOOLING Normal See Charging Chart Overcharge High High OK High Undercharge Low Low OK or High Low Liquid Restriction Low Low High H...

Page 73: ...onnect electrical power to the unit before removing the top panel or any electrical panel as the fan motor could start at any time and live electrical connections will be exposed Annual cleaning of the exterior cabinet is recommended using a mild detergent water and cloth sponge to remove dust mold and potentially corrosive contaminants that have collected on the cabinet It is also recommended to ...

Page 74: ...ON PRESS TRANSDUCER WIRE NUT 24 VAC 24 VAC INPUT COMPONENT CODES RV REVERSING VALVE WIRE COLOR CODE BK BLACK BR BROWN BL BLUE G GREEN G Y GRAY O ORANGE PR PURPLE R RED W WHITE Y YELLOW REV PART NO WIRING INFORMATION WARNING CABINET MUST BE PERMANENTLY GROUNDED AND CONFORM TO I E C N E C C E C NATIONAL WIRING REGULATIONS AND LOCAL CODES AS APPLICABLE REPLACEMENT WIRE MUST BE THE SAME SIZE AND TYPE ...

Page 75: ... C next to the Aux Input 1 Config label e Change the Aux 1 Config type to N C by pressing the orange up or blue down arrows at the bottom of the screen twice f Select Off next to the Aux Input 1 Config label g Change the Aux 1 Config value from Off to Shutdown by pressing the orange up button at the bottom of the screen two times After each press of the orange up button the value next to the Aux 1...

Page 76: ...est Mode NOTE While the test mode is active the thermostat will not permit return to the home screen a To turn the unit off either press the blue down button until stop test appears at the bottom of the screen and then press stop test on the installer checkout screen or open the normally closed switch attached to the air handler or furnace Aux 1 inputs NOTE Once the unit is requested to shut down ...

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Fujitsu FO20R Series, Installation Instructions Manual

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