Friedrich Twintemp Service Manual Download Page 49

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ELECTRICAL TROUBLESHOOTING CHART — HEAT PUMP

Reversing Valve Stuck

Replace the Reversing Valve

Replace the Solenoid Coil

Is the Solenoid Coil Good?

Is Line Voltage

Present at the Solenoid

Is the Selector Switch

Set for Heat?

SYSTEM COOLS WHEN

HEATING IS DESIRED.

YES

HEAT PUMP

YES

TROUBLESHOOTING CHART — HEATPUMP

Noncondensables (air)

in System

Overcharged

Low Air

ﬂ

ow Across

Indoor Coil

Outdoor Ambient Too High

For Operation In Heating

Moisture in System

Defective Compressor

Undercharged

Overcharged

Undercharged

Refrigerant System

Restriction

Reversing Valve not

Fully Seated

Low Air

ﬂ

Across Outdoor Coil

Outdoor Ambient Too High

for Operation in Heating

Refrigerant System

Restriction

Reversing Valve not

Fully Seated

REFRIGERANT SYSTEM DIAGNOSIS - HEATING CYCLE

LOW SUCTION PRESSURE

HIGH SUCTION PRESSURE

LOW HEAD PRESSURE

HIGH HEAD PRESSURE

Summary of Contents for Twintemp

Page 1: ...Heat High Heat MAX COO L MAX HEAT Fan Only Off Allow 3 min between restarts Money Fan Timer Operation Set Hr Stop Start Temperature Fan Cool On Off Power Cooler Only Speed Saver Warm er Money Fan Time...

Page 2: ...IONING CO Post Office Box 1540 San Antonio Texas 78295 1540 4200 N Pan Am Expressway San Antonio Texas 78218 5212 210 357 4400 FAX 210 357 4490 www friedrich com Printed in the U S A TECHNICAL SUPPORT...

Page 3: ...ontrol and Error Code Listings 17 18 Testing the Rotary Control Switches 19 20 Functional Component Definition 20 Components Testing 21 24 Defrost Thermostat Operation 24 Electronic Control Sequence o...

Page 4: ...sistant if possible Capacitors even when disconnected from the electrical power source retain an electrical charge potential capable of causing electric shock or electrocution Handle discharge and tes...

Page 5: ...contact with liquid refrigerant can result in minor to moderate injury Be extremely careful when using an oxy acetylene torch Direct contact with the torch s flame or hot surfaces can cause serious b...

Page 6: ...ilure to follow these instructions can result in fire and minor to serious property damage WATER DAMAGE HAZARDS Improper installation maintenance or servicing of the air conditioner unit or not follow...

Page 7: ...n conjunction with the installation manuals provided with each air conditioning system component This service manual was written to assist the professional RAC service technician to quickly and accura...

Page 8: ...X Straight Cool 2nd Digit Q Q Star S Small Chassis M Medium Chassis L Large Chassis H HazardGard 3rd and 4th Digit Approximate BTU HR in 1000s Cooling Heating BTU Hr capacity listed in the Specificat...

Page 9: ...17500 17300 230 208 7 2 7 7 1620 1570 10 8 10 8 4 5 375 M 169 163 SM21L30 20600 20200 230 208 9 4 10 1 2081 2020 9 9 10 0 6 0 425 M 160 154 SM24L30 23500 23000 230 208 11 2 12 1 2479 2421 9 5 9 5 7 0...

Page 10: ...1 16 16 15 16 27 3 8 42 18 3 16 26 3 16 7 3 8 L 20 3 16 28 33 5 8 16 3 3 16 18 15 16 29 7 8 42 20 3 8 28 15 1 8 TWINTEMP models include accessories for thru the wall installation only Window mounting...

Page 11: ...7 28 84 261 4 7 15 1 21 0 31 0 208 230 20 ES12L33 E 58 22 122 174 66 17 28 84 261 4 7 15 1 21 0 31 0 208 230 20 ES16L33 C 49 32 130 179 50 8 34 75 279 7 4 15 1 35 0 32 0 208 230 20 ES16L33 D 49 32 130...

Page 12: ...size fuse circuit breaker Read electrical ratings on unit s rating plate Proper circuit protection is the responsibiity of the homeowner Grounding Unit MUST be grounded from branch circuit through ser...

Page 13: ...l e r r o or time delay fuse does not exceed the amp rating listed in Figure 1 DO NOT use an extension cord The cord provided will carry the proper amount of electrical power to the t o n l l i w d r...

Page 14: ...light on Smart Fan will adjust the fan speed e l p m a x e r o F l e v e l t r o f m o c d e r i s e d e h t n i a t n i a m o t y l l a c i t a m o t u a d o i r e p d e d n e t x e n a r o f n e p o...

Page 15: ...PressSetHouroncetoseethecurrentclockset ting Continue pressing the button until you arrive at the current time MAKE SURE YOU SET THE A M AND P M PROPERLY NOTE MINUTES ARE NOT SHOWN ON THE DISPLAY A l...

Page 16: ...ill adjust the fan speed automatically to maintain the desired comfort level For example if the outside doorsin your home are opened for an extended period of time or more people enter a room Smart Fa...

Page 17: ...mode of operation 2 COOL Press the Cool button to automatically switch the operating mode to COOL 3 FAN ONLY Press the Fan Only button if you want to run the fan only 4 MoneySaver Press the MoneySaver...

Page 18: ...o t g n i t t e s r i a e h t h t i w d e s u e b n a c t i r o m o o r e h t m o r f e k o m s r o r i a e l a t s e v o m e r Fresh Air d n a g n i r p s e h t n i y l l a i c e p s e m o o r e h t...

Page 19: ...n on QME models Theindoortemperaturewilldisplayfor10seconds Indoor temperature can be viewed in all modes including the TEST mode The display can be changed back to SET temperature by pressing any key...

Page 20: ...f E2 still displays after exiting Error Code Mode E3 FROST PROBE OPEN Normal operation is allowed Ohm frost probe Replace probe if ohm value not read If ohm value is present replace board E4 FROST PRO...

Page 21: ...als C and 3 C2 and 2 H and M S AR and 5 System Control Switch Heat Pump Electric Heat Models 5 Hi Heat Position between terminals C and 1 C2 and 4 H and M S AR and 5 6 Med Heat Position between termin...

Page 22: ...d room temp for a cycle fan operation Fan Motor Dual shafted fan motor operates the indoor blower wheel and the condenser fan blade simultaneously Solenoid Used to energize the reversing valve on all...

Page 23: ...t anticipator is energized to supply a small amount of heat during the on cycle This will open the contacts in the thermostat prematurely to maintain a closer differential between the cut in and cut o...

Page 24: ...rops below 20 the unit will operate in electric heat mode continuously until the outdoor coil temperature rises above 43 The fan motor will not turn off when defrost occurs and the 4 way valve will no...

Page 25: ...refore the possibility of capacitor failure is much greater when the identified terminal is connected to the S or start terminal The identified terminal should always be connected to the supply line o...

Page 26: ...3 KW heater 11 9 ohms for the 4 0 KW heater and 9 15 ohms for the 5 2 KW heater should be registered Figure 25 Heating Element DEFROST THERMOSTAT OPERATION HEAT PUMP WITH ELECTRIC HEAT YS YM AND YL MO...

Page 27: ...un continuously MONEY SAVER Mode When in MONEY SAVER mode the system will be turned on when the indoor temperature gets above the set point by 0 75 F and turns off when the indoor temperature gets bel...

Page 28: ...sed changed to a Liquid before leaving the condenser coil The refrigerant leaves the condenser Coil through the liquid line as a warm high pressure liquid It next will pass through the refrigerant dri...

Page 29: ...g for the compressor motor When this occurs the motor winding temperature will increase causing the motor to overheat and possibly cycle open the compressor overload protector Continued overheating of...

Page 30: ...FREEZE HAZARD Proper safety procedures must be followed and proper protective clothing must be worn when working with a torch Failure to follow these procedures could result in moderate or serious inj...

Page 31: ...evaporator will not be encountered because the refrigerant will boil later if at all Gauges connected to system will usually have higher head pressure depending upon amount of over charge Suction pres...

Page 32: ...a partial restriction there may be gurgling sounds at the metering device entrance to the evaporator The evaporator in a partial restriction could be partially frosted or have an ice ball close to th...

Page 33: ...posite port liquid line to the indoor coil Refer to refrigerant flow chart This directs the refrigerant through the filter drier and cooling capillary tube to the indoor coil In the heating mode of op...

Page 34: ...essure suction side of the system The other two are connected to the indoor and outdoor coils Small capillary tubes connect each end of the main valve cylinder to the A and B portsofthepilotvalve Athi...

Page 35: ...n part of the discharge gas from the compressor is directed back to the suction side resulting in excessively high suction pressure Should the valve fail to shift from coooling to heating block the ai...

Page 36: ...excess braze from all tubing so that they will slip into fittings on new valve 5 Remove solenoid coil from new valve The use of a torch requires extreme care and proper judgment Follow all safety reco...

Page 37: ...ated within the compressor shell usually due to recycling of the motor is slow to dissipate It may take anywhere from a few minutes to several hours for the overload to reset Checking the External Ove...

Page 38: ...ective If the compressor has been operating for sometime a careful examination must be made to determine why the compressor failed Many compressor failures are caused by the following conditions 1 Imp...

Page 39: ...system will need to be cleaned up following proper procedures 7 Install the replacement compressor 8 Pressurize with a combination of R 22 and nitrogen and leak test all connections with an electronic...

Page 40: ...all refrigerant and oil from the system Remove compressor capillary tube and filter drier from the system Flush evaporator condenser and all connecting tubing with dry nitrogen or equivalent Use appro...

Page 41: ...and compressed air or vacuum If using a pressure washer be careful not to bend the aluminium fin pack Use a sweeping up and down motion in the direction of the vertical aluminum fin pack when pressure...

Page 42: ...nd rinse with warm water Allow it to dry thoroughly before reinstalling it in the chassis ROUTINE MAINTENANCE Continued Do not drill holes in the bottom of the drain pan or the underside of the unit N...

Page 43: ...Inoperative system switch Test switch replace if inoperative Broken loose or incorrect wiring Refer to applicable wiring diagram Open capacitor Test capacitor replace if inoperative Fan speed switch...

Page 44: ...ck temp differential delta T across coil Touch test coil return bends for same temp Test for low running current n o i t c A e s u a C e l b i s s o P m e l b o r P Compressor runs continually does no...

Page 45: ...k if unit operates If unit operates replace t stat Loose or broken parts in t stat Check as above Incorrect wiring Refer to appropriate wiring diagram Defective thermistor Replace thermistor or electr...

Page 46: ...t cycles Defective thermistor Replace thermistor or electronic control board T stat differential too narrow Replace t stat Plenum gasket not sealing allowing discharge air to short cycle t stat Check...

Page 47: ...ace defrost control Defrost control contacts stuck If contacts remain closed between terminals 2 3 of the defrost control after preselected time interval has passed replace control Defrost control bul...

Page 48: ...ture rise across coil Refer to speci cation sheet for correct temperature rise Reversing valve failing to shift completely bypassing hot gas Deenergize solenoid coil raise head pressure energize solen...

Page 49: ...r in System Overcharged Low Air ow Across Indoor Coil Outdoor Ambient Too High For Operation In Heating Moisture in System Defective Compressor Defective Compressor Undercharged Overcharged Undercharg...

Page 50: ...place compressor Starts to shift but does not complete reversal Hot Warm Warm Hot TVB Hot Not enough pressure differential at start of stroke or not enough ow to maintain pressure differential Check u...

Page 51: ...ELECTRONIC CONTROL COOL ONLY MODELS XQ05L10A C XQ06L10A C XQ08L10A B A E XQ10L10A C XQ12L10A B A C 49...

Page 52: ...ELECTRONIC CONTROL COOL ONLY MODELS SS08L10 E F G SS10L10 D E SS12L10 E F SS14L10 D E SS12L30 E F SS16L30 D E SM18L30A D A E SM21L30 E F SM24L30 C D 50...

Page 53: ...ELECTROMECHANICAL CONTROL COOL ONLY MODELS KS12L10 E F KS15L10 C D KM18L30 C D KM24L30 C D 51...

Page 54: ...ELECTROMECHANICAL CONTROL COOL ONLY MODELS SL28L30 D E SL36L30A D A E 52...

Page 55: ...ELECTROMECHANICAL CONTROL COOL WITH ELECTRIC HEAT MODEL EQ08L11A B A E 53...

Page 56: ...ELECTROMECHANICAL CONTROL COOL WITH ELECTRIC HEAT MODELS ES12L33 D E ES16L33 C D EM18L34 C EM24L34 B 54...

Page 57: ...ELECTROMECHANICAL CONTROL COOL WITH ELECTRIC HEAT MODELS EL36L35A D A E 55...

Page 58: ...ELECTROMECHANICAL CONTROL HEAT PUMP ONLY MODELS YS09L10 F G 56...

Page 59: ...ELECTROMECHANICAL CONTROL HEAT PUMP WITH ELECTRIC HEAT MODELS YS13L33 D E YM18L34 D E 57...

Page 60: ...ELECTROMECHANICAL CONTROL HEAT PUMP WITH ELECTRIC HEAT MODELS YL24L35 E F 58...

Page 61: ...thickness is considered Light Construction An insulated wall or masonry wall over 8 inches in thickness is considered Heavy Construction 3b Multiply the total length linear feet of all inside walls b...

Page 62: ...FEET OF WIDTH 9 SUBTOTAL 10 TOTAL COOLING LOAD BTU per hour to be used for selection of room air conditioner s No Shades 60 80 75 75 110 150 120 0 ____sq ft ____sq ft ____sq ft ____sq ft ____sq ft ___...

Page 63: ...e unit capacity line intersect read down to the outdoor ambient temperature scale and nd that this unit will deliver the required BTU Hr capacity to approximately 30 F The heat load form on the follow...

Page 64: ...insulated Sq Ft x 0 10 Built up Roof 1 2 insulated Sq Ft x 0 20 No Insulation Sq Ft x 0 33 FLOOR Area Sq Ft Above Vented Crawl space Insulated 1 Sq Ft x 0 20 Uninsulated Sq Ft x 0 50 Slab on Ground Li...

Page 65: ...stallation wiring electrical current characteristics or maintenance or caused by accident misuse or abuse fire flood alterations and or misapplication of the product and or units installed in a corros...

Page 66: ......

Page 67: ...IONING CO Post Office Box 1540 San Antonio Texas 78295 1540 4200 N Pan Am Expressway San Antonio Texas 78218 5212 210 357 4400 FAX 210 357 4490 www friedrich com Printed in the U S A TECHNICAL SUPPORT...

Page 68: ...AIR CONDITIONING CO Post Office Box 1540 San Antonio Texas 78295 1540 4200 N Pan Am Expressway San Antonio Texas 78218 5212 210 357 4400 FAX 210 357 4490 www friedrich com Printed in the U S A RAC Ser...

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