Lennox XP21-024 Installation Instructions Manual Download Page 51

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Page 51

XP21 SERIES

HEAT PUMP

CONTROL (A175)

CONTROL BOX

FAN MOTOR CONTROL (A177)

PULSE−WIDTH MODULATION (PWM)

JUMPER

OFF

JUMPER

LED

CFM Profile Pin Select

Verify DC voltage output using fan pwm out and com
terminals. see table 15 for optimal DC voltage based on
CFM profile used.

COM

FAN PWM OUT

AN PWM OUT

ARK

COM

GREEN

RED

BROWN

RED

BLACK

RED

GREEN

FAN MOTOR

CONTROL

YELLOW

BLACK

YELLOW

BLUE

SEE TABLE 15 FOR CFM PROFILE
SELECTION OPTIONS.

YELLOW

HIGH PRESSURE SWITCH (S4)

YELLOW

B4 FAN

MOTOR

HEAT PUMP CONTROL

Figure 35. Fan Motor Control, Wiring, Jumper Settings, Testing and LED Location

Summary of Contents for XP21-024

Page 1: ...See the icomfort Touch thermostat Quick Start Guide for communicating and partial communicating field wiring connections INSTALLATION INSTRUCTIONS Dave Lennox Signature Collection XP21 System HEAT PUM...

Page 2: ...INE INLET UNIT SUPPORT FEET 35 1 2 902 18 1 2 470 8 203 4 1 2 114 ELECTRICAL INLET HIGH VOLTAGE 37 940 024 AND 036 SOLAR MODULE WIRING ELECTRICAL INLET CONTROL WIRING LOW VOLTAGE 47 1194 048 AND 060 M...

Page 3: ...H PRESSURE SWITCH S4 LIQUID VALVE AND GAUGE PORT TRUE SUCTION LINE PORT LOW PRESSURE SWITCH S87 CRANKCASE HEATER THERMOSTAT S40 CRANKCASE HEATER HR1 BELLY BAND COMPRESSOR MUFFLER DISCHARGE LINE CHECK...

Page 4: ...r liquid and suction lines Using Manifold Gauge Set When checking the system charge only use a manifold gauge set that features low loss anti blow back fittings IMPORTANT To prevent stripping of the v...

Page 5: ...12 1 12 TURN To Access Service Port A service port cap protects the service port core from contamination and serves as the primary leak seal 1 Remove service port cap with an appropriately sized wren...

Page 6: ...o meets a certain value or when the suction pressure is as high as 20 psig Compressor suction pressures should never be allowed to go into a vacuum Prolonged operation at low suction pressures will re...

Page 7: ...he unit directly outside a window Glass has a very high level of sound transmission For proper placement of unit in relation to a window see the provided illustration in figure 5 detail A PLACING UNIT...

Page 8: ...ance of two 2 degrees or two inches per five feet 50 mm per 1 5 m away from building structure MOUNTING SLAB BUILDING STRUCTURE GROUND LEVEL Outside Unit Placement Slab Mounting at Ground Level SAME F...

Page 9: ...ET AIR INLET AIR INLET AIR Figure 6 Rooftop Application and Wind Barrier NOTICE Roof Damage This system contains both refrigerant and oil Some rubber roofing material may absorbed oil and cause the ru...

Page 10: ...rmly throughout this procedure Rotate bottom corner of panel away from hinged corner post until lower three tabs clear the slots as illustrated in detail B 3 Move panel down until lip of upper tab cle...

Page 11: ...0 3 8 10 1 1 8 29 Field Fabricated NOTE Some applications may required a field provided 7 8 to 1 1 8 adapter NOTE When installing refrigerant lines longer than 50 feet see the Lennox Refrigerant Pipin...

Page 12: ...RAFTER AT 8 FEET 2 43 METERS INTERVALS THEN STRAP THE LIQUID LINE TO THE VAPOR LINE FLOOR JOIST OR ROOF RAFTER REFRIGERANT LINE SET INSTALLING HORIZONTAL RUNS NOTE Similar installation practices shou...

Page 13: ...erform operations only in well ventilated areas Wear gloves and protective goggles or face shield to protect against burns Wash hands with soap and water after handling brazing alloys and flux IMPORTA...

Page 14: ...it point NITROGEN HIGH LOW B A C PIPING PANEL REMOVAL AND PREPARING LINE SET CAP AND CORE REMOVAL Remove piping panel for easier access to service valves Cut ends of the refrigerant lines square free...

Page 15: ...on previous page and below for manifold gauge setup 5 SUCTION VAPOR LINE WHEN BRAZING LINE SET TO SERVICE VALVES POINT FLAME AWAY FROM SERVICE VALVE WARNING 1 FIRE PERSONAL INJURY OR PROPERTY DAMAGE w...

Page 16: ...tributor tubes during this process G Remove and discard check expansion valve and the two Teflon rings H Use a field provided fitting to temporary reconnect the liquid line to the indoor unit s liquid...

Page 17: ...ected the liquid line to the indoor unit s distributor assembly B Install one of the provided Teflon rings around the stubbed end of the check expansion valve and lightly lubricate the connector threa...

Page 18: ...der of HFC 410A refrigerant to the center port of the manifold gauge set Open the valve on the HFC 410A cylinder vapor only B Open the high pressure side of the manifold to allow HFC 410A into the lin...

Page 19: ...t and indoor unit until the absolute pressure does not rise above 500 microns 29 9 inches of mercury within a 20 minute period after shutting off the vacuum pump and closing the manifold gauge valves...

Page 20: ...o the unit nameplate for minimum circuit ampacity and maximum fuse or circuit breaker HACR per NEC Install power wiring and properly sized disconnect switch NOTE Units are approved for use only with c...

Page 21: ...control wire connections to heat pump control A175 B ROUTE CONTROL WIRES COMMUNICATING Maximum length of wiring 18 gauge for all connections on the RSBus is limited to 1500 feet 457 meters Color coded...

Page 22: ...Page 22 506601 01 Figure 15 Typical XP21 Wiring...

Page 23: ...ES RS BUS DATA COMMUNICATION IS ACTIVE COMMUNICATION MODE ONLY Table 3 on page 24 provides additional information concerning jumpers links and connections for the heat pump control E37 E47 DS12 E48 E3...

Page 24: ...oor coil temperature sensor supply COIL 2 Outdoor coil temperature sensor return Range is 40 F to 140 F Sensor is clipped on a 5 16 copper return bend E33 Field Test This jumper allows service personn...

Page 25: ...actory with metal jumpers installed across W1 W2 and W3 For two stage electric heat remove factory installed metal jumper between W1 to W2 Then connect thermostat wire between the air handler control...

Page 26: ...ations This will slow the outdoor unit s fan speed to a specific RPM A wire must be installed between the DS terminals on the furnace and outdoor unit controls See table 15 for fan speed based on unit...

Page 27: ...ange listed on the unit s nameplate If not do not start the equipment until you have consulted with the power company and the voltage condition has been corrected 6 Set the thermostat for a cooling de...

Page 28: ...14 13 74 21 21 21 20 19 19 18 17 16 16 15 14 13 12 72 20 20 19 18 17 17 16 15 15 14 13 12 11 10 70 19 19 18 18 17 17 16 15 15 14 13 12 11 10 57 58 59 60 61 62 63 64 65 66 67 68 69 70 TEMPERATURE OF A...

Page 29: ...eference table is a general guide Expect minor pressure variations Significant differences may mean improper charge or other system problem 5 Set thermostat for heat cool demand depending on mode bein...

Page 30: ...5 1 10 CBX32M 036 and CBX32MV 036 17 5 0 0 CBX32M 048 and CBX32MV 048 12 5 1 10 CBX40UHV 036 17 5 0 0 CBX40UHV 042 12 5 1 10 CBX40UHV 048 12 5 1 10 CH23 51 19 7 0 0 CH33 43 11 5 0 7 CH33 44 48B 11 5 0...

Page 31: ...43 85 29 303 151 303 150 311 145 305 144 90 32 325 152 326 151 334 146 328 146 95 35 348 154 350 152 358 147 352 147 100 38 372 155 374 153 383 149 376 148 105 41 397 156 400 154 410 150 402 150 110 4...

Page 32: ...s onto vapor and liquid lines Insert grommets into piping panel to isolate refrigerant lines from sheet metal edges TWO ISOLATION GROMMETS ARE PROVIDE FOR THE LIQUID AND SUCTION LINE PIPE PANEL PASS T...

Page 33: ...p control has three operational modes which are S Defrost calibration and operation see figure 27 S Defrost test see figure 28 DEFROST TERMINATION TEMPERATURES E47 The heat pump control selections are...

Page 34: ...first stage compressor output is active in heating mode and the outdoor ambient temperature is below the selected compressor lock in temperature the second stage compressor solenoid output will be en...

Page 35: ...is to be initiated 100 90 DEGREE TARGET 70 DEGREE TARGET 50 DEGREE TARGET 100 90 70 50 DEGREE TARGET 100 90 70 50 100 90 70 50 100 90 70 50 E47 Heat Pump Control A175 Defrost Termination E47 Pins Fact...

Page 36: ...be executed and unit will continue in the mode it was operating Place a jumper on TEST pins for more than two seconds Clears any short cycle lockout and five strike fault lockout function if applicabl...

Page 37: ...CH S87 LOCKOUT LED ALERT CODE OR CRITICAL ALERT 411 DISPLAYED SERVICE REQUIRED2 LED ALERT CODE OR MODERATE ALERT 410 DISPLAYED SERVICE REQUIRED2 NORMAL OPERATION CLOSED CLOSED OPEN OPEN 1 If 5 strike...

Page 38: ...ED SERVICE REQUIRED2 LED ALERT CODE OR MODERATE ALERT 412 DISPLAYED SERVICE REQUIRED2 NORMAL OPERATION CLOSED CLOSED OPEN OPEN 1 If 5 strike counter has four or less strikes when Y1 demand is terminat...

Page 39: ...CLEARED SERVICE REQUIRED2 LED ALERT CODE OR MODERATE ALERT 414 CLEARED NORMAL OPERATION CLOSED CLOSED OPEN OPEN 1 If 5 strike counter has four or less strikes when Y1 demand is terminatedor satisfied...

Page 40: ...RESSOR ANTI SHORT CYCLE TIMER BEGINS YES LED ALERT CODE OR MODERATE ALERT 418 CLEARED ANTI SHORT CYCLE TIMER ENDS W OUTPUT ACTIVE NORMAL OPERATION LED ALERT CODE OR MODERATE ALERT 418 CLEARED NO YES N...

Page 41: ...10 4 61693 26 2 204829 92 0 7007 42 3 24525 9 9 62712 27 0 210805 90 6 7225 41 7 24934 9 3 63752 27 8 217080 89 4 7444 41 1 25349 8 8 64812 28 7 223677 88 1 7666 40 5 25769 8 3 65895 29 5 230621 86 9...

Page 42: ...4 478 164 1 1563 120 1 3755 75 0 10495 232 4 492 163 2 1590 119 3 3816 74 1 10749 230 5 507 162 3 1617 118 5 3877 73 1 11014 228 6 523 161 4 1644 117 8 3940 72 1 11289 226 7 538 160 5 1672 117 0 4005...

Page 43: ...ormal the fault or lockout LED code is turned off automatically Table 13 System Status Fault and Lockout LED Codes and Related icomfort Touch Thermostat Alert Codes System fault and lockout LED DS11 D...

Page 44: ...lly caused by delay in outdoor unit responding to indoor unit poling Recycle power Check all wiring connections Cleared after unresponsive device responds to any inquiry None Critical Alert Code 124 A...

Page 45: ...or shorted or temperature is out of sensor range Outdoor unit control will not perform demand or time temperature defrost operation System will still heat or cool Clears when outdoor unit control dete...

Page 46: ...essure S Check for excessively low thermostat setting S Check evaporator airflow coil blockages or re turn air filter S Check ductwork or registers for blockage 4 Faulty metering device S Check TXV bu...

Page 47: ...wer reset 6 flashes then pause Off Critical Alert Code 406 Open start circuit Current not sensed by Start transformer 1 Run capacitor has failed 2 Open circuit in compressor start wiring or connection...

Page 48: ...e and then a long pause 3 The fan motor speed RPM revolutions per minute indicator is displayed next see table 15 4 There is a short pause The above sequence will continue to repeat if a thermostat de...

Page 49: ...Codes During start up the fan motor control LED will display any error conditions If error conditions exist then no other codes will display If no error conditions are present then the stage status a...

Page 50: ...WO SLOW FLASHES AND ONE SHORT PAUSE LED RPM INDICATOR EXAMPLE 2 TON 5 SLOW FLASHES AND LONG PAUSE EDA OPERATION ECM2 Y2 ONLY LED STAGE INDICATOR THREE SLOW FLASHES AND ONE SHORT PAUSE LED RPM INDICATO...

Page 51: ...om terminals see table 15 for optimal DC voltage based on CFM profile used COM FAN PWM OUT FAN PWM OUT PARK COM J2 GREEN RED BROWN RED BLACK RED RED GREEN FAN MOTOR CONTROL YELLOW BLACK YELLOW BLUE SE...

Page 52: ...N RED BLACK RED RED GREEN FAN MOTOR CONTROL YELLOW BLACK YELLOW BLUE SEE TABLE 15 FOR CFM PROFILE SELECTION OPTIONS BLACK WIRE YELLOW WIRE VAC VDC 24 EXT PWR R 24VAC INPUT DURING DEMAND ONLY INPUT VOL...

Page 53: ...ILLE MOUNTING POINTS GRILLE MOUNTING POINTS FASTENER INSERTION POINT FAN MOTOR MOUNTING POINTS PUSH FORWARD PUSH FORWARD The four mounting point holes that secure the top grille to the plastic top are...

Page 54: ...ELD TEST E33 pins within 2 to 4 seconds after removal The control s DS11 and DS14 LEDs will start blinking the Unit Nominal Code at three 3 second intervals starting at 1 ton through to 6 ton If a cod...

Page 55: ...coil more frequently if it is exposed to substances which are corrosive or which block airflow across the coil e g pet urine cottonwood seeds fertilizers fluids that may contain high levels of corros...

Page 56: ...ormed as your system removes humidity from the inside air Have your dealer show you the location of the drain line and how to check for obstructions This would also apply to an auxiliary drain if inst...

Page 57: ...d correct system refrigerant charge All components in the system must be functioning proper to correctly perform compressor modulation operational check Accurate measurements are critical to this test...

Page 58: ...ressor Discharge Line Higher Higher Indoor Return Air Same Same Indoor Coil Discharge Air Lower Higher Pressures Suction Vapor Lower Down Liquid Higher Higher Note Heat pump may have a low ambient con...

Page 59: ...mperature Return Air Temperature HEATING MODE Vapor Pressure Liquid Pressure Supply Air Temperature Ambient Temperature Return Air Temperature System Refrigerant Charge Refer to manufacturer s informa...

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