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Bryant 180B024, Application Manual And Service Manual

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Bryant 180B024 Application Manual And Service Manual Download Page 5

Residential Air Conditioners and Heat Pumps Using R-22 and Puron® Refrigerant: Application Guideline and Service Manual

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

5

Accessories

Table 1 – Required Field-Installed Accessories for Air Conditioners

ACCESSORY

REQUIRED FOR LOW-AMBIENT 

COOLING APPLICATIONS

(Below 55°F/12.8°C)

REQUIRED FOR

LONG LINE 

APPLICATIONS

*

*. For tubing line sets between 80 and 200 ft. (24.38 and 60.96 m)  and/or 35 ft. (10.7 m) vertical differential, refer to Residential Piping and Longline Guideline.

REQUIRED FOR 

SEA COAST 

APPLICATIONS

(Within 2 miles/3.22 km)

Ball Bearing Fan Motor

Yes 

†‡

†. Additional requirement for Low-Ambient Controller (full modulation feature) MotorMasterr Control. 

‡. Evolution 2-stage units come standard with this accessory.

No

No

Compressor Start Assist Capacitor and Relay

Yes

**

**.Not required on 2-stage

Yes

No

Crankcase Heater

Yes 

‡

Yes 

‡

No

Evaporator Freeze Thermostat

Yes 

‡

No

No

Hard Shut-Off TXV

Yes

Yes

Yes

Liquid Line Solenoid Valve

No

No

No

Motor Master or Low-ambient Pressure Switch

Yes 

‡

No

No

Support Feet

Recommended

No

Recommended

Winter Start Control

Yes 

‡

No

No

Table 2 – Required Field-Installed Accessories for Heat Pumps

ACCESSORY

REQUIRED FOR LOW-AMBIENT

COOLING APPLICATIONS

(Below 55°F / 12.8°C)

REQUIRED FOR

LONG LINE 

APPLICATIONS

*

*. For tubing line sets between 80 and 200 ft. (24.38 and 60.96 m)  and/or 20 ft. (6.09 m) vertical differential, refer to Residential Piping and Longline Guideline.

REQUIRED FOR

SEA COAST 

APPLICATIONS (Within 2 

miles / 3.22 km)

Accumulator

Standard

Standard

Standard

Ball Bearing Fan Motor

Yes 

†‡

†. Additional requirement for Low-Ambient Controller (full modulation feature) MotorMasterr Control. 

‡. Evolution 2-stage units come standard with this accessory.

No

No

Compressor Start Assist Capacitor and Relay

Yes 

**

**.Not required on 2-stage

Yes

No

Crankcase Heater

Yes 

‡

Yes 

‡

No

Evaporator Freeze Thermostat

Yes 

‡

No

No

Hard Shutoff TXV

Yes

Yes

Yes

Isolation Relay

Yes 

No

No

Liquid Line Solenoid Valve

No

See Long-Line Application 

Guideline

No

Motor MasterÒ Control or

Low Ambient Switch

Yes 

‡

No

No

Support Feet

Recommended

No

Recommended

Summary of Contents for 180B024

Page 1: ...uid Line Filter Drier 29 Suction Line Filter Drier 29 Accumulator 30 Thermostatic Expansion Valve TXV 31 Make Piping Connections 32 REFRIGERATION SYSTEM REPAIR 33 Leak Detection 33 Coil Removal 33 Aluminum Coil Removal 34 Compressor Removal and Replacement 35 System Clean Up After Burnout 35 Evacuation 35 Check Charge 36 TROUBLESHOOTING with SUPERHEAT 37 Single Stage Communicating Heat Pump System...

Page 2: ...r Open No 230V at Compressor Contractor 59 180B 187B 286B 289B 59 Troubleshooting units for proper switching between low high stages 59 180B 187B 286B 289B 59 Unloader Test Procedure 180B 187B 286B 289B 59 Temperature Thermistors 60 Thermistor Sensor Comparison 60 Failed Thermistor Default Operation 60 Two Stage Non Communicating 127A CA17 BA17CH17 BH17 226A 62 Operating Ambient 62 Airflow Selecti...

Page 3: ...ate These numbers are needed to service and repair the Puron and R 22 air conditioner or heat pump Model and serial numbers can be found on unit rating plate Serial Number Nomenclature Air Conditioner and Heat Pump Model Number Nomenclature 1 2 3 4 5 6 7 8 9 10 11 12 1 1 3 A N A 036 N N N Type Tier SEER Major Series Voltage Grille Variations Cooling Capacity tons Open Open Open 1 AC 2 HP 1 Legacy ...

Page 4: ...g replaced for any other reason use approved acid test kit to determine acid level If even low levels of acid are detected install factory approved 100 percent activated alumina suction line filter drier in addition to the factory supplied liquid line filter drier Remove the suction line filter drier as soon as possible with a maximum of 72 hr 2 Drain oil from low points or traps in suction line a...

Page 5: ...No No Hard Shut Off TXV Yes Yes Yes Liquid Line Solenoid Valve No No No Motor Master or Low ambient Pressure Switch Yes No No Support Feet Recommended No Recommended Winter Start Control Yes No No Table 2 Required Field Installed Accessories for Heat Pumps ACCESSORY REQUIRED FOR LOW AMBIENT COOLING APPLICATIONS Below 55 F 12 8 C REQUIRED FOR LONG LINE APPLICATIONS For tubing line sets between 80 a...

Page 6: ...ommercial applications 5 Outdoor Air Temperature Sensor Designed for use with Bryant Thermostats listed in this publication This device enables the thermostat to display the outdoor temperature This device is required to enable special thermostat features such as auxiliary heat lock out Usage Guideline Suggested for approved Bryant thermostats 6 Thermostatic Expansion Valve TXV A modulating flow c...

Page 7: ...ble See most current Product Data for updates Evolution Series 2 Stage units are capable of low ambient cooling only with Evolution UI control A210697 Fig 1 Base Mid Tier Deluxe 4 sided Baffle Assembly Entry Mid Tier and 4 Sided Deluxe Units in UNIT SIZE AA UNIT HEIGHT A B C 1 C 2 C 3 D Mini Base 23 1 8 25 5 16 20 3 8 10 1 16 1 5 16 8 1 4 3 1 2 39 1 4 28 11 16 23 13 16 11 3 4 32 1 8 27 3 16 13 1 2...

Page 8: ...er to Residential Piping and Long Line Guideline for air conditioner and heat pump systems using Puron refrigerant or Long Line Guideline for R 22 Air Conditioners and Heat Pumps CABINET ASSEMBLY Basic Cabinet Designs Certain maintenance routines and repairs require removal of the cabinet panels There are 3 basic cabinet designs for air conditioning and heat pumps Each design tier has options of s...

Page 9: ...luxe 1 Turn off all power to outdoor and indoor units 2 Remove access panel 3 Remove information plate 4 Disconnect fan motor wires and cut wire ties Remove wires from control box Refer to unit wiring label 5 Remove screws holding top cover to louver panels 6 Lift top cover from unit 7 Reverse sequence for reassembly Remove Fan Motor Assembly Mid Tier Deluxe 1 Perform items 1 through 6 from above ...

Page 10: ... 22 and Puron Refrigerant Application Guideline and Service Manual Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations 10 A210700 A210701 Fig 3 Legacy Series Control Box Identification ...

Page 11: ... and Puron Refrigerant Application Guideline and Service Manual Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations 11 Labeling A210702 A210703 Fig 4 Label Locations Mid Tier Deluxe Entry ...

Page 12: ... ohmmeter A very low or 0 resistance should be read Higher readings could indicate burned or pitted contacts which may cause future failures Capacitor A94006 Fig 5 Capacitors NOTE If bleed resistor is wired across start capacitor it must be disconnected to avoid erroneous readings when ohmmeter is applied across capacitor Capacitors are used as a phase shifting device to aid in starting certain si...

Page 13: ...ower off attach voltmeter leads across T1 and T3 and set thermostat so that Y terminal is energized Make sure all protective devices in series with Y terminal are closed Voltmeter should read 24v across T1 and T3 With 24v still applied move voltmeter leads to T2 and T3 After 5 2 minutes voltmeter should read 24v indicating control is functioning normally If no time delay is encountered or device n...

Page 14: ...ch High Pressure Switch AC HP The high pressure switch is located in liquid line and protects against excessive condenser coil pressure It opens around 610 or 670 psig for Puron and 400 psig for R22 10 for both Switches close at 298 20 psig for R 22 and 420 or 470 25 psig for Puron High pressure may be caused by a dirty condenser coil failed fan motor or condenser air re circulation To check switc...

Page 15: ...e cycle is complete R Y is turned off and compressor and outdoor fan should stop With Bryant thermostats the O terminal remains energized in the cooling mode If the mode is switched to heat or Off the valve is de energized There is no compressor delay built into this control Heating Sequence of Operation KH32EA001 On a call for heating thermostat makes R Y and R G Circuit R Y sends low voltage thr...

Page 16: ...at to OFF Shut off all power to outdoor unit 2 Remove control box cover for access to electrical components and defrost control board 3 Disconnect defrost thermostat leads from control board and connect to ohmmeter Thermostat leads are black insulated wires connected to DFT and R terminals on control board Resistance reading may be zero indicating closed defrost thermostat or Evolution for open th...

Page 17: ...Cooling On a call for cooling thermostat makes R O R Y and R G Circuit R O energizes reversing valve switching it to cooling position Circuit R Y sends low voltage through the safeties and energizes the T1 terminal on the circuit board If the compressor has been off for 5 minutes or power has not been cycled for 5 minutes the OF2 relay and T2 terminal will energize This will close the contactor st...

Page 18: ...at pumps with Puron refrigerant and has all the same functionality speedups troubleshooting as the HK32EA003 except for the forced defrost timing when Quiet Shift 2 is enabled Quiet Shift 2 non communicating Quiet shift 2 is a field selectable defrost mode factory set to OFF which will reduce the occasional noise that could be heard at the start of defrost cycle and restarting of heating cycle It ...

Page 19: ...d Service Manual Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations 19 A05378A Fig 11 Defrost Control HK32EA008 A170235 Fig 12 Defrost Control HK32EA009 A170130 Fig 13 Defrost Control HK32EA010 A05378A Fig 14 Defrost Control HK32EA011 ...

Page 20: ...ct electrical connection at the compressor The plug can be removed by simultaneously pulling while rocking plug However these plugs can be used only on specific compressors The configuration around the fusite terminals is outlined on the terminal covers The slot through which wires of plug are routed is oriented on the bottom and slightly to the left The correct plug can be connected easily to com...

Page 21: ...oad or breaker or damage to the compressor This compressor is equipped with internal protection that opens if this high vacuum condition exists and bypasses high pressure gas to the low pressure and the internal overload may trip In the case of refrigerant pump down the unit can operate with pump down but this protection may not allow the refrigerant to be pumped down completely Internal Pressure ...

Page 22: ...ped on compressor nameplate If compressor draws locked rotor amps and all other external sources of problems have been eliminated compressor must be replaced Because compressor is a sealed unit it is impossible to determine exact mechanical failure However complete system should be checked for abnormalities such as incorrect refrigerant charge restrictions insufficient airflow across indoor or out...

Page 23: ... that appears to resonate through the suction line could indicate a need to add more flex or muffling in the lines This has been occasional in scroll compressor applications and is usually remedied by adding a field fabricated suction line loop see Fig 17 Reciprocating compressors may have a noticeable discharge pulsation that could be remedied with a field installed discharge muffler Recommend lo...

Page 24: ...ways turn off all power to unit and disconnect leads at compressor terminals before taking readings Most common motor failures are due to either an open grounded or short circuit When a compressor fails to start or run 3 tests can help determine the problem First all possible external causes should be eliminated such as overloads improper voltage pressure equalization defective capacitor s relays ...

Page 25: ...or is the indoor coil In a heat pump the condenser is the indoor coil in the heating mode and the evaporator is the outdoor coil In the typical air conditioning mode compressed hot gas leaves the compressor and enters the condensing coil As gas passes through the condenser coil it rejects heat and condenses into liquid The liquid leaves condensing unit through liquid line and enters metering devic...

Page 26: ...ge in state of flux coincides with the flame change in color The addition of flux will minimize the flame change in color The alloy is ready to apply when the flux is in the clear state Most aluminum alloys melt at 1200 F and the braze materials melt between 905 F and 1080 F The zinc alloys ZA 1 melt at a lower temperature while alloys which have more aluminum content melt at a higher temperature ...

Page 27: ...ior from the heat of the brazing operations Pumpdown Procedure Service valves provide a convenient shutoff valve useful for certain refrigeration system repairs System may be pumped down to make repairs on low side without losing complete refrigerant charge 1 Attach pressure gauge to suction service valve gauge port 2 Front seat liquid line valve 3 Start unit in cooling mode Run until suction pres...

Page 28: ... a remote reading electronic type thermometer with multiple probes Route thermocouple leads to inside of coil area through service valve mounting plate area underneath coil Fig 22 and Fig 23 show test points TP on reversing valve for recording temperatures Insulate points for more accurate reading If valve is defective 1 Shut off all power to unit and remove charge from system 2 Remove solenoid co...

Page 29: ... and install filter drier as follows 1 Braze 5 in liquid tube to the indoor coil 2 Wrap filter drier with damp cloth 3 Braze filter drier to 5 in long liquid tube from step 1 4 Connect and braze liquid refrigerant tube to the filter drier Suction Line Filter Drier The suction line drier is specifically designed to operate with Puron use only factory authorized components Suction line filter drier ...

Page 30: ...l from lack of lubrication If bleed hole is plugged accumulator must be changed The accumulator has a fusible element located in the bottom end bell See Fig 26 This fusible element will melt at 430 F 221 C and vent the refrigerant if this temperature is reached either internal or external to the system If fuse melts the accumulator must be replaced To change accumulator 1 Shut off all power to uni...

Page 31: ... filter drier must be installed in the liquid line at the indoor unit Installing TXV in Place of Piston in a Rated Indoor Coil pre 2006 1 Pump system down to 2 psig if possible and recover refrigerant 2 Remove hex nut from piston body Use backup wrench on fan coils 3 Remove and discard factory installed piston Be sure Teflon seal is in place 4 Reinstall hex nut Finger tighten nut plus 1 2 turn NOT...

Page 32: ... mechanical connection then use wrench and back up wrench to attach If coil has brazed connection use file or tubing cutters to remove mechanical flare nut from equalizer line Then use coupling to braze the equalizer line to stub previous equalizer line in suction line 10 Attach TXV bulb to vapor tube inside cabinet in same location as original was when removed using supplied bulb clamps nylon or ...

Page 33: ...95423 Fig 30 Bubble Leak Detection You may use an electronic leak detector designed for specific refrigerant to check for leaks See Fig 29 This unquestionably is the most efficient and easiest method for checking leaks There are various types of electronic leak detectors Check with manufacturer of equipment for suitability Generally speaking they are portable lightweight and consist of a box with ...

Page 34: ...isolator is shown in Fig 33 There is a threaded mechanical fitting on the liquid distributor This connection is not field serviceable and should not be disturbed The copper stub tube connection to the liquid service valve needs to be un brazed for coil removal See Fig 34 A13187A Fig 31 Fin Isolator Location A190396 Fig 32 Use Braze Shield to Protect Aluminum A13186A Fig 33 Fin Isolator Orientation...

Page 35: ...rom accumulator if used 3 Remove and discard liquid line strainer and filter drier 4 After system is reassembled install liquid and suction line Puron filter driers NOTE On heat pumps install suction line drier between compressor and accumulator 5 Operate system for 10 hr Monitor pressure drop across drier If pressure drop exceeds 3 psig replace suction line and liquid line filter driers Be sure t...

Page 36: ... and the indoor temperature is between 70 F 21 11 C and 80 F 26 67 C Follow the procedure below Unit is factory charged for 15ft 4 57 m of lineset Adjust charge by adding or removing 0 6 oz ft of 3 8 liquid line above or below 15ft 4 57 m respectively For standard refrigerant line lengths 80 ft 24 38 m or less allow system to operate in cooling mode at least 15 minutes If conditions are favorable ...

Page 37: ... tightness orientation on vapor tube and is properly wrapped If OK proceed to Step 2 2 Check superheat at vapor service valve and Pseudo Evaporator Superheat If both are less than 2 F TXV likely not controlling properly i e stuck open REPLACE VALVE If superheat is higher than 15 F proceed to Step 3 3 Perform TXV function check With system running place sensing bulb in ice bath for 1 minute superhe...

Page 38: ... information Suction line temperature at the outlet of the evaporator F Suction line pressure at the outdoor unit psig Outdoor nominal unit size btuh Suction line equivalent line length ft Suction line pressure drop from tables Table 6 and Table 7 Pressure Temperature relationship for refrigerant used P T Chart If system uses a vapor line the same size as vapor service valve fitting or larger AND ...

Page 39: ...eat at the compressor is due principally to heat gain in the 75 feet of suction line with a minor contribution by the pressure drop Because the suction line of the lineset was the same size as the vapor service valve fitting and less than 80 feet Tom could have ignored the pressure drop in the suction line and obtained the evaporator superheat by using the vapor service valve pressure of 125 psig ...

Page 40: ... takes the suction line temperature at the outlet of the evaporator and obtains 51 F Per the instructions Jason adds the 10 psig pressure drop to the 60 psig pressure at the outdoor unit to get 70 psig at the evaporator Saturated pressure of 70 psig equates to approximately 41 F Jason determines the Evaporator superheat to be 51 F 41 F 10 F Jason concludes the TXV is functioning properly A210716 F...

Page 41: ...49 2 56 5 7 162 57 3 268 88 5 374 111 9 480 130 7 608 149 4 58 7 1 164 58 0 270 89 0 376 112 2 482 131 0 610 151 3 60 8 5 166 58 7 272 89 5 378 112 6 484 131 3 612 150 0 62 9 8 168 59 4 274 60 0 380 113 0 486 131 6 614 150 2 64 11 1 170 60 1 278 90 5 382 113 4 488 131 9 616 150 5 66 12 4 172 60 7 278 91 0 384 113 8 490 132 3 618 150 7 68 13 7 174 61 4 280 91 5 386 114 2 492 132 6 620 151 0 70 15 0...

Page 42: ... 12 2 99 58 6 163 87 9 227 110 2 291 128 5 355 144 1 419 157 8 36 13 2 100 59 1 164 88 3 228 110 5 292 128 7 356 144 3 420 158 0 37 14 2 101 59 7 165 88 7 229 110 8 293 129 0 357 144 5 421 158 2 38 15 2 102 60 2 166 89 1 230 111 1 294 129 3 358 144 8 422 158 4 39 16 2 103 60 7 167 89 5 231 111 4 295 129 5 359 145 0 423 158 6 40 17 1 104 61 3 168 89 9 232 111 8 296 129 8 360 145 2 424 158 8 41 18 1...

Page 43: ... 93 91 89 370 111 109 107 105 103 101 99 97 95 93 91 380 113 111 109 107 105 103 101 99 97 95 93 390 115 113 111 109 107 105 103 101 99 97 95 400 117 115 113 111 109 107 105 103 101 99 97 410 119 117 115 113 111 109 107 105 103 101 99 420 121 119 117 115 113 111 109 107 105 103 101 430 122 120 118 116 114 112 110 108 106 104 102 440 124 122 120 118 116 114 112 110 108 106 104 450 125 124 122 120 1...

Page 44: ... 54 56 58 60 62 64 66 112 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 114 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 116 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 118 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 120 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 122 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 124 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 126 44 46 48 5...

Page 45: ...105 103 101 99 97 95 93 91 89 87 85 83 81 79 215 107 105 103 101 99 97 95 93 91 89 87 85 83 81 220 108 106 104 102 100 98 96 94 92 90 88 86 84 82 225 110 108 106 104 102 100 98 96 94 92 90 88 86 84 230 111 109 107 105 103 101 99 97 95 93 91 89 87 85 235 113 111 109 107 105 103 101 99 97 95 93 91 89 87 240 114 112 110 108 106 104 102 100 98 96 94 92 90 88 245 116 114 112 110 108 106 104 102 100 98 ...

Page 46: ...4 66 68 66 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 67 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 68 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 69 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 70 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 71 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 72 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 73 43 45 47 49 51 53 55 57 59 61 63...

Page 47: ...210751 Fig 39 Control Board Amber Status Light An amber colored STATUS light is used to display the operation mode and fault codes as specified in the troubleshooting section See Table 14 for codes and definitions NOTE Only one fault code will be displayed on the outdoor unit control board the most recent with the highest priority Crankcase Heater Operation The crankcase heater when applicable is ...

Page 48: ...is control offers 4 possible defrost interval times 30 60 90 or 120 minutes These are selected by dip switches on the unit control board or in the Evolution control if used The Evolution Control selection overrides the control board dip switch settings Auto defrost is available with Evolution communicating control only and it must be enabled in the User Interface Auto defrost adjusts the defrost i...

Page 49: ...an internal overload attached to motor windings TROUBLESHOOTING Systems Communication Failure If communication between User Interface UI and condensing unit is lost the outdoor control will flash the appropriate fault code See Table 14 Check the wiring to the UI indoor and outdoor units Pressure Switch Protection The outdoor unit is equipped with high and low pressure switches If the control sense...

Page 50: ...range If the sensors are out of range the control will flash the appropriate fault code See Table 14 The thermistor comparison is not performed during low ambient cooling or defrost operation Failed Thermistor Default Operation Factory defaults have been provided in the event of failure of outdoor air thermistor and or coil thermistor If the OAT sensor should fail low ambient cooling will not be a...

Page 51: ...r air sensor not reading or out of range Ohm out sensor and check wiring Outdoor Coil Sensor Fault 55 Coil sensor not reading or out of range Ohm out sensor and check wiring Thermistors out of range 56 Improper relationship between coil sensor and outdoor air sensor Ohm out sensors and check wiring Thermal Cutout 72 Compressor voltage sensed after start up then absent for 10 consecutive seconds wh...

Page 52: ...ts with Puron refrigerant has dip switches for defrost timing The Evolution controls provide these two stage units with high stage latching and Hybrid Heatt dual fuel capabilities The standard Hybrid Heatt duel fuel thermostat can be used on two stage units with Bristol reciprocating compressors only Model Plug Each control board contains a model plug The correct model plug must be installed in or...

Page 53: ...e within 10 minutes then the normal LPS trip response shut down cooling operation and generate LPS trip error will occur For 180B 289B models the PWM output for both high and low stage equals the value for low stage operation below 55_F 12 8_C Defrost This control offers 5 possible defrost interval times 30 60 90 120 minutes or AUTO With non communicating thermostats these are selected by dip swit...

Page 54: ...gerant migration in the heating mode The solenoid should be installed near the outdoor unit with the arrow facing the outdoor unit This is the direction of flow control See application manual for long line application details Accessory Liquid Solenoid with Evolution Communicating Control When using the Evolution Control the liquid line solenoid output is provided at the Y1 connection Connect the s...

Page 55: ...with the addition of an internal unloading mechanism that opens a bypass port in the first compression pocket effectively reducing the displacement of the scroll The opening and closing of the bypass port is controlled by an internal electrically operated solenoid The modulated scroll uses a single step of unloading to go from full capacity to approximately 67 capacity A single speed high efficien...

Page 56: ...un Check the high voltage supply The unit need not be running to check high voltage but the power must be on If the 230vac is present use Table 16 to check for proper control voltage output to the fan motor from the control board The control board sends DC voltage signals to the motor through the terminals labeled PWM1 and PWM2 Set a voltmeter on a DC voltage scale and check across these terminals...

Page 57: ... The control board must know the coil temperature so it can activate various functions These functions include Frost sensing on heat pumps Coil vs Ambient temperature relationship Low ambient cooling operation Thermistor Curve The resistance vs temperature chart enables the service technicians to check thermistor resistance regardless of the temperature For example at a 60_F 15 6_C temperature the...

Page 58: ...e model plug must be transferred from the original board to the replacement board for the unit to operate NOTE The model plug takes priority over factory model information inputted at the factory If the model plug is removed after initial power up the unit will operate according to the last valid model plug installed and flash the appropriate fault code temporarily Pressure Switch Protection The o...

Page 59: ...operate the outdoor fan The control Status LED will flash the appropriate code shown in Table 18 After 15 minutes with a call for low or high stage cooling or heating the compressor contactor is energized If the thermal protector has not re set the outdoor fan is turned off If the call for cooling or heating continues the control will energize the compressor contactor every 15 minutes If the therm...

Page 60: ...the coil sensor the sensors are out of range In heating if the outdoor air sensor indicates 35_F warmer than the coil sensor or the outdoor air sensor indicates 10_F cooler than the coil sensor the sensors are out of range If the sensors are out of range the control will flash the appropriate fault code as shown in Table 18 The thermistor comparison is not performed during low ambient cooling or d...

Page 61: ...el plug Unit will not operate without correct model plug High Pressure Switch or Discharge Temp Switch Open 31 High pressure switch trip Check refrigerant charge outdoor fan operation and coils for airflow restrictions Low Pressure Switch Open 32 Low pressure switch trip Check refrigerant charge and indoor air flow Control Fault 45 Outdoor unit control board has failed Control board needs to be re...

Page 62: ...responding airflow If the airflow setting for low cooling needs to be switched from tap 1 to a different tap jumper a connection from the Fan tap to the desired tap so that the Y1 signal is communicated via the Fan tap to the desired speed tap The Y1 setting will also govern the continuous fan airflow for the furnace Refer to the literature for the furnace for further details Airflow Selection for...

Page 63: ...enoid is energized The loading and unloading of the two step scroll is done on the fly without shutting off the motor between steps NOTE 67 compressor capacity translates to approximately 75 cooling or heating capacity at the indoor coil The compressor will always start unloaded and stay unloaded for five seconds even when the thermostat is calling for high stage capacity Quiet Shift Quiet shift i...

Page 64: ...ging requirements Heating Check Chart Procedure To check system operation during heating cycle refer to the Heating Check Chart on outdoor unit This chart indicates whether a correct relationship exists between system operating pressure and air temperature entering indoor and outdoor units If pressure and temperature do not match on chart system refrigerant charge may not be correct Do not use cha...

Page 65: ...e plastic as plastic will hold moisture possibly causing corrosion Cleaning Coil 1 Remove top cover See Remove Top Cover in Cabinet section of this manual 2 Remove coil grilles or louvers as applicable to gain full access to coils for cleaning Fig 3 Clean coil using vacuum cleaner and its crevice tool Move crevice tool vertically close to area being cleaned making sure tool touches only dirt on fi...

Page 66: ... through 1 complete operating cycle 4 If there are any discrepancies in operating cycle troubleshoot to find cause and correct Refrigerant Circuit 1 Check refrigerant charge using the superheat method and if low on charge check unit for leaks using an electronic leak detector 2 If any leaks are found remove and reclaim or isolate charge pumpdown if applicable Make necessary repairs 3 Evacuate rech...

Page 67: ...sing R 22 and Puron Refrigerant Application Guideline and Service Manual Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations 67 A90208 Fig 48 Air Conditioner Troubleshooting Chart ...

Page 68: ...ing R 22 and Puron Refrigerant Application Guideline and Service Manual Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations 68 A90206 Fig 49 Heat Pump Troubleshooting Heating Cycle ...

Page 69: ...ing R 22 and Puron Refrigerant Application Guideline and Service Manual Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations 69 A90207 Fig 50 Heat Pump Troubleshooting Cooling Cycle ...

Page 70: ...ction Pressure Dro 39 R 22 System Suction Pressure Drop 40 Puron Refrigerant Pressure Temperature Chart 41 R 22 Refrigerant Pressure Temperature Relationship 42 Puron Subcooling Chart 43 Puron Superheat Chart 44 R 22 Subcooling Chart 45 R 22 Superheat Chart 46 Status Codes 51 Model Plug Information 52 Outdoor Temp DC volts Tolerance 2 56 Two Stage Compressor Resistances Winding Resistance at 70 F ...

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