Lennox XP14 SERIES Unit Information
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Lennox XP14 SERIES Unit Information

Xp14 series high efficiency residential split system heat pump unit
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See also: Instruction and Installation Manual
Service Literature
The XP14 is a high efficiency residential split−system heat
pump unit, which features a scroll compressor and
HFC−410A refrigerant. XP14 units are available in sizes
ranging from 1 1/2 through 5 tons. The series is designed
for use with an indoor unit with an expansion valve ap-
proved for HFC−410A. This manual is divided into sections
which discuss the major components, refrigerant system,
charging procedure, maintenance and operation se-
quence.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are
subject to change.
IMPORTANT
Operating pressures of this HFC−410A unit are
higher than pressures in HCFC−22 units. Always
use service equipment rated for HFC−410A.
WARNING
Warranty will be voided if covered equipment is re-
moved from original installation site. Warranty will
not cover damage or defect resulting from:
Flood, wind, lightning, or installation and opera-
tion in a corrosive atmosphere (chlorine, fluorine,
salt, recycled waste water, urine, fertilizers, or oth-
er damaging chemicals).
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person-
al injury or loss of life. Installation and service must
be performed by a qualified installer or service
agency.
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at discon-
nect switch(es). Unit may have multiple
power supplies.
Corp. 0721−L7
Revised 06−2008
XP14 SERIES UNITS
Specifications / Electrical
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©2007 Lennox Industries Inc.
XP14
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Summary of Contents for Lennox XP14 SERIES

  • Page 1: Table Of Contents

    XP14 Corp. 0721−L7 Revised 06−2008 Service Literature XP14 SERIES UNITS The XP14 is a high efficiency residential split−system heat pump unit, which features a scroll compressor and HFC−410A refrigerant. XP14 units are available in sizes ranging from 1 1/2 through 5 tons. The series is designed for use with an indoor unit with an expansion valve ap- proved for HFC−410A.
  • Page 2 SPECIFICATIONS General Model No. XP14−018 XP14−024 XP14−030 XP14−036 XP14−042 XP14−048 XP14−060 Data Nominal Tonnage Connections Liquid line o.d. − in. (sweat) Vapor line o.d. − in. 1-1/8 Refrigerant HFC−410A charge furnished 8 lbs. 8 lbs. 7 lbs. 9 lbs. 12 lbs. 12 lbs.

  • Page 3: I Unit Information

    The compressor is energized by a contactor located in the control box. See figure 2. Single−pole contactors are used in all XP14 series units. K1 is energized through the de- frost control by the indoor thermostat terminal Y1 (24V) when thermostat demand is present.
  • Page 4 Low Pressure Switch (LO−PS) When the low pressure switch trips, the defrost control will cycle off the compressor, The compressor and fan in XP14 series units use permanent and the strike counter in the control will count one strike. split capacitor motors. The capacitor is located inside the unit The low pressure switch is ignored under the following con- control box (see figure 2).
  • Page 5 Coil Sensor The coil temperature sensor (shown in fig- Ambient and Coil Sensor ure 6) considers outdoor temperatures below −35°F (−37°C) 5750 or above 120°F (48°C) as a fault. If the coil temperature 7450 sensor is detected as being open, shorted or out of the tem- 9275 perature range of the sensor, the defrost control will not per- 11775...
  • Page 6 NOTE − The 30 second off cycle is NOT functional when Calibration success depends on stable system tempera- jumpering the TEST pins. tures during the 20−minute calibration period. If the control fails to calibrate, another defrost cycle will be initiated after Operational Description 45 minutes (90 minutes −1 to −4 boards) of heating mode The defrost control has three basic operational modes:...
  • Page 7 Defrost Control Pin Operation Y1 Active ( 0" line inactive) Short test pins for longer Short test pins for more than 2 seconds than 1 second but less than 2 seconds Clear any short cycle lockout and 5 strike fault lockout function, if applicable. Clear any short cycle lockout If in COOLING Mode If in HEATING Mode...
  • Page 8 Calibration Mode Sequence Occurs after power up, after cooling operation, or if the coil temperature exceeds the termination temperature while in Heat Mode. DCB defaults to 34 minutes Time/Temperature Mode Reset Compressor Runtime / Reset Three / Five Strike Counter DEMAND MODE 34 MIN.
  • Page 9 TABLE 2 Diagnostic Fault Code Green Condition/Code Possible Cause(s) Solution Power problem No power (24V) to control termi- Check control transformer power (24V). nals R & C or board failure. If power is available to control and LED(s) do not light, replace board. Simultaneous Normal operation Unit operating normally or in...
  • Page 10 B − Compressor (B1) The scroll compressors in all XP14 model units are de- signed for use with HFC−410A refrigerant and operation at high pressures. Compressors are shipped from the factory with 3MA (32MMMA) P.O.E. oil. See electrical section in SOUND COVER this manual for compressor specifications.
  • Page 11 The liquid is worked toward the cen- DANGER ter of the scroll and is discharged. If the compressor is re- placed, conventional Lennox cleanup practices must be used. Make sure all power is disconnected before Due to its efficiency, the scroll compressor is capable of draw- beginning electrical service procedures.
  • Page 12 HR1 is controlled by introduced to the oil. Table 3 lists kits available from Lennox a thermostat located on the liquid line. When liquid line tem- to check POE oils.

  • Page 13: Refrigerant System

    III − REFRIGERANT SYSTEM Refer to figure 16 and 17 for refrigerant flow in the heat- ing and cooling modes. The reversing valve is energized during cooling demand and during defrost. XP14 COOLING CYCLE (SHOWING MANIFOLD GAUGE CONNECTIONS) OUTDOOR UNIT DISTRIBUTOR COIL SENSOR REVERSING VALVE...
  • Page 14 A − Plumbing Service Valve (Valve Closed) Field refrigerant piping consists of liquid and vapor lines from the outdoor unit (sweat connections). Use Lennox stem cap L15 (sweat) series line sets as shown in table 4. service port TABLE 4...

  • Page 15: Warning

    Using an Electronic Leak Detector or Halide Ball Valve (Valve Open) 1 − Connect a cylinder of HFC−410A to the center port of Use Adjustable Wrench the manifold gauge set. To open: rotate Stem Clockwise 90°. To close: rotate Stem Counter-clockwise 90°. 2 −...
  • Page 16 4 − Open both manifold valves and start the vacuum C − Charging pump. Refrigerant Charge 5 − Evacuate the line set and indoor unit to an absolute This system is charged with HFC−410A refrigerant which pressure of 23,000 microns (29.01 inches of mercu- operates at much higher pressures than HCFC−22.

  • Page 17: Setup For Checking And Adding Charge

    Step 1. Determine the desired DT Measure entering air tempera- Temp. ture using dry bulb (A) and wet bulb (B). DT is the intersecting value 24 24 24 23 23 22 22 22 20 19 18 17 16 15 of air entering of A and B in the table (see triangle).

  • Page 18: Weigh In Charge

    3 ounce per 5 ft. (85g per 1.5m) Adding Charge for Indoor Match−Up Table 7 lists all the Lennox recommended indoor unit matches along with the NOTE − *If line length is greater than 15 ft. (4.6 m), add this amount. If line length is less than 15 ft.
  • Page 19 TABLE 7 Adding Charge per Indoor Unit Match using Subcooling Method 1 Check the airflow as illustrated in figure20 to be sure the indoor airflow is as required. (Make any air flow adjustments before continuing with the following procedure.) cooling 2 Measure outdoor ambient temperature;...

  • Page 20: Service And Recovery

    TABLE 8 V − SERVICE AND RECOVERY HFC−410A Temp. (°F) − Pressure (Psig) °F Psig °F Psig °F Psig °F Psig WARNING 100.8 178.5 290.8 445.9 Polyol ester (POE) oils used with HFC−410A refrig- 102.9 181.6 295.1 451.8 erant absorb moisture very quickly. It is very impor- 105.0 184.3 299.4...

  • Page 21: Maintenance

    VI − MAINTENANCE B − Indoor Coil In order to maintain the warranty on this equipment, the 1 − Clean coil, if necessary. XP14 system must be serviced annually and a record of 2 − Check connecting lines and coils for evidence of oil service maintained.

  • Page 22: Wiring Diagram

    VII − WIRING DIAGRAM AND SEQUENCE OF OPERATION XP14 UNIT DIAGRAM Page 22...
  • Page 23 XP14 OPERATING SEQUENCE This is the sequence of operation for XP14 series units. FIRST STAGE HEAT: The sequence is outlined by numbered steps which cor- Internal thermostat wiring de−energizes terminal O by heat- respond to circled numbers on the adjacent diagram.

This manual is also suitable for:

Xp14−018Xp14−024Xp14−030Xp14−036Xp14−042Xp14−048 ... Show all

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