Service and Maintenance Instructions - Carrier

1 1FB4, FE4, FF1E,FFM, FH4, FV4,FX4, FZ4, PF4,FMAS ervice and Maintenance InstructionsResidential Fan Coil UnitsNOTE: Read the entire instruction manual before starting OF CONTENTSPAGETABLE OF COIL DESCRIPTION AND , FH4, PF4 (EVEN SIZES) AND FF1E (EVEN SIZES), , FX4D, PF4, FF1E, AND FZ (ODD SIZES) AND AND CONNECTORS (FK4, FV4) OPERATING MOTOR CONTROL TEST VALUES (WITH 16 PIN CONNECTOR AT MOTOR UNPLUGGED) 12FE4 SELF IDENTIFYING RESISTOR AND TAP AND DELAY OFF AND HEATER FUNCTION AND , FE4, FF1E, FH4, FV4, FX4, FZ AND AND AND , FE4, FH4, FV4, FX4, FZ4 AND , FFMA, FLOW CONTROL COIL COPPER OR TIN PLATED COILS WITH ALL ALUMINUM COILS WITH A COIL UNITS SLOPE COIL UNITS CONSIDERATIONSI mproper installation, adjustment, alteration, Service , Maintenance ,or use can cause explosion, fire, electrical shock, or otherconditions which may cause death, personal injury or propertydamage.

2 Consult a qualified installer, Service agency, or yourdistributor or branch for information or assistance. The qualifiedinstaller or agency must use factory authorized kits or accessorieswhen modifying this product. Refer to the individual instructionspackaged with kits or accessories when all safety codes. Wear safety glasses, protective clothingand work gloves. Have a fire extinguisher available. Read theseinstructions thoroughly and follow all warnings or cautionsincluded in literature and attached to the unit. Consult localbuilding codes and the current editions of the National ElectricalCode (NEC) NFPA Canada, refer to the current editions of the Canadian ElectricalCode CSA safety information. This is the safety alert symbol .When you see this symbol on the unit and in instruction manuals,be alert to the potential for personal the signal words DANGER, WARNING, andCAUTION.

3 These words are used with the safety alert identifies the most serious hazards which will result insevere personal injury or death. WARNING signifies hazardswhich could result in personal injury or death. CAUTION is usedto identify unsafe practices which may result in minor personalinjury or product and property damage. NOTE is used to highlightsuggestions which will result in enhanced installation, reliability, OPERATION AND SAFERTY HAZARDF ailure to follow this warning could result in personal injuryor (R 410A) systems operate at higher pressures thanR 22 systems. Do not use R 22 Service equipment orcomponents on R 410 equipment. Ensure Service equipmentis rated for R 410.!WARNINGINTRODUCTIONThe F and PF series fan coil units are designed for flexibility ina variety of applications that meet upflow, horizontal, or downflowrequirements. Units are available in 1 1/2 through 5 ton nominalcooling capacities.

4 Factory authorized, field installed electricheater packages are available in 3 through 30 , FMA4P Fan Coils are designed with applicationflexibility in mind and are suitable for closet and flush mountinstallations. Units are available with field installed electric heatwith circuit breaker. Units are used indoors as the fan coil forsplit system heat pumps or air conditioners. The FMA4P uses arefrigerant piston metering device and a 3 speed PSC uses a TXV and a 5 speed multi tap ECM Motor forefficiency. Units are available in 18,000 through 36,000 Btuhnominal cooling : Nuisance sweating may occur if the unit is installed in ahumid location with low are designed for upflow application only. Local codes maylinit this free air return type unit to installation in single OPERATION HAZARDF ailure to follow this warning could result in personal injuryor installing or servicing unit, always turn off all power tounit.

5 There may be more than one disconnect switch. Turn offaccessory heater power if applicable. Lock out and tag switchwith a suitable warning label.!WARNINGFAN COIL DESCRIPTION AND TROUBLESHOOTINGFY5, FH4, PF4 (even sizes)and FF1E (even sizes),FAN MOTORThe motor is two or three speed direct drive. High speed lead isblack, low speed lead is red, and common lead is yellow. Be sureproper blower speed has been motor is turned on through two different routes. The firstoccurs when thermostat calls for the fan in cooling, heat pump, orfan only mode. A 24 Vac signal is sent to relay, causing relay toclose its normally open contacts, turning fan second occurs when there is a call for electric heat. A 24 Va csignal is sent to heater sequencer/relay, causing it to close, directing230V through the normally closed contact of fan relay, turning fanon. The fan remains on until sequencer/relay motor does run, test motor for an open winding or a windingshorted to motor case.

6 If either is present, replace HEATER SERVICES ervice can be completed with heater in place. Shut off powerbefore Limit SwitchRefer to Electric Heater Function and Troubleshooting section ofthis SequencerRefer to Electric Heater Function and Troubleshooting section ofthis TransformerA 40 VA transformer supplies 24 V power for control for 208/230V on primary side of transformer. If present,check for 24V on secondary : Transformer is fused. Do not short Fan RelayRelay coil is 24 V. Check for proper control voltage. Replace relayif OR REPLACING REFRIGERANTFLOW CONTROL DEVICER efer to Fig. 26 and Instructions given in Piston Body Cleaningor Replacement refrigerant flow control device is protected by a wire meshstrainer. It is located inside the 3/8 in. liquid tube at field brazejoint next to flow control device. Access to strainer is through fieldbraze OF UnitCOOLINGWhen thermostat calls for cooling, the circuit between R and G iscomplete and single pole single throw relay FR is energized.

7 Thenormally open contacts close causing blower to circuit between R and Y is also complete. This completedcircuit causes contactor in outdoor unit to close which startscompressor and outdoor thermostat calls for heating and FAN switch is set on AUTO,the circuit between R and W is complete. The heater sequence SEQis energized which closes contacts of relay. There will be a timedelay. This completed circuit energizes all heating elements HTRand blower Heat PumpCOOLINGOn a call for cooling, the thermostat makes circuits R O, R Y, andR G. Circuit R O energizes reversing valve, switching it tocooling position. Circuit R Y energizes contactor starting outdoorfan motor and compressor. Circuit R G energizes indoor unitblower relay starting indoor blower thermostat is satisfied, its contacts open de energizingcontactor reversing valve and blower relay. This stops compressorand fan a call for heating, the thermostat makes circuits R Y and R R Y energizes contactor starting outdoor fan motor andcompressor.

8 Circuit R G energizes indoor blower relay startingblower temperature continue to fall, R W circuit is made throughsecond stage room thermostat bulb. Circuit R W energizes asequencer bringing on supplemental electric thermostat is satisfied, its contacts open de energizingcontactor and sequencer. All heaters and motors should 00, 01 (HK61EA002, HK61EA006)Control BoardsThis section of the Service manual describes the CESO130003 00and 01 PCB by examining the functional operation of the Circuit Board (PCB) ComponentLayout of the actual PCB is depicted in Fig. 1 and Fig. low voltage stripped leads are used to connect the24 V side of transformer to indoor thermostat and 5 amp fuse is used to protect the low voltage trans-former fan relay is controlled by thermostat and turns fan onand plug is used as the connection for PCB power and electricheaters. Note the pin numbers on time delay relay circuit keeps fan motor running for ap-proximately 90 seconds after G is de energized.

9 The time delay can be defeated by cutting jumper JW1 on theCES0130003 01, HK61EA002 and FunctionsA. Wiring of Transformer Primary or High SideYellow wire from Molex plug is wired to C terminal ontransformer and black wire from PCB relay (normally open) terminal is wired to 208 V or 230 V terminal ontransformer. Units are factory wired at 230 V Wiring of Transformer Secondary or 24 V SideRed wire of transformer is wired to T terminal on PCB andbrown wire of transformer is wired to C terminal on : T terminal on PCB is used to protect the transformer. Tterminal is connected through the fuse to R terminal on Indoor Fan1. WiringIndoor fan motor yellow lead is wired to C terminal ontransformer. The red, blue, or black speed lead is wired toSPT terminal on fan relay part of PCB. Units are factorywired on medium speed (blue lead connected).NOTE: Unused fan speed leads must be capped or taped off toprevent direct short to cabinet Functional Controla.

10 Thermostat and Relay ControlWhen thermostat calls for the fan in cooling, heat pump,heating, or fan only mode, a 24 Vac signal is sent to causes the relay to close its normally open contacts,turning on fan. When thermostat no longer calls for the fan,the signal sent to relay is turned off and relay opens causingfan to turn off after a 90 second fan off Sequencer/Electric Heat Relay InterlockThe fan will also operate whenever there is a call for electricheat, even if fan relay is not energized. This happens be-cause fan is interlocked with first stage of electric heatthrough the normally closed contact of fan : The fan interlock is only connected to first stage electricheat (W2). W3 and E do not contain an interlock with fan. Seeoutdoor thermostat installation Instructions when electric heatstaging is Electric HeatWhen thermostat calls for electric heat, a 24 Vac signal is sent tosequencer/heat relay through W2, causing first stage to turn on.