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Service Literature
The XC15 is a high efficiency residential split−system con-
densing unit, which features a scroll compressor and
R−410A refrigerant. Units are available in 2, 2−1/2, 3, 3−1/2,
4 and 5 ton sizes. The series is designed for use with an
expansion valve only (approved for use with R−410A) in the
indoor unit. This manual is divided into sections which dis-
cuss the major components, refrigerant system, charging
procedure, maintenance and operation sequence.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are
subject to change.
CAUTION
Physical contact with metal edges and corners while
applying excessive force or rapid motion can result
in personal injury. Be aware of, and use caution when
working nearby these areas during installation or
while servicing this equipment.
IMPORTANT
Operating pressures of this R−410A unit are higher
than pressures in R−22 units. Always use service
equipment rated for R−410A.
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.
WARNING
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. 0621−L4
Revised 07−2009
XC15 SERIES UNITS
To prevent personal injury, or damage to panels, unit
or structure, be sure to observe the following:
While installing or servicing this unit, carefully stow
all removed panels out of the way, so that the panels
will not cause injury to personnel, nor cause damage
to objects or structures nearby, nor will the panels be
subjected to damage (e.g., being bent or scratched).
While handling or stowing the panels, consider any
weather conditions, especially windy conditions,
that may cause panels to be blown around and bat-
tered.
Specifications / Electrical Data
VII Diagrams and Sequence of Operation
Page 1
CAUTION
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©2006 Lennox Industries Inc.
XC15
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Summary of Contents for Lennox XC15 Series
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Page 1: Table Of Contents
CLICK ANYWHERE on THIS PAGE to return to LENNOX HVAC MANUALS & PARTS GUIDES at InspectApedia.com XC15 Corp. 0621−L4 Service Literature Revised 07−2009 XC15 SERIES UNITS The XC15 is a high efficiency residential split−system con- densing unit, which features a scroll compressor and R−410A refrigerant. -
Page 2: General
SPECIFICATIONS General Model No. XC15−024 XC15−030 XC15−036 XC15−042 XC15−048 XC15−060 Data −1 −2 −3 −4 −1 −2 −3 −4 −1, −2, −3 −1, −2, −3 −1, −2 −1, −2 Nominal Tonnage Connections Liquid line (o.d.) − in. (sweat) Suction line (o.d.) − in. 1−1/8 Refrigerant R−410A charge furnished 8 lbs. - Page 3 SPECIFICATIONS General Model No. XC15−024 XC15−030 XC15−036 XC15−042 Data −5 −6 −5 −6 −4 −5 −4 −5 Nominal Tonnage Connections Liquid line (o.d.) − in. (sweat) Suction line (o.d.) − in. Refrigerant R−410A charge furnished 8 lbs. 4 oz. 8 lbs. 3 oz. 8 lbs.
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Page 4: I Application
Remove the louvered panels as follows: All major components (indoor blower and coil) must be 1. Remove 2 screws, allowing the panel to swing open matched according to Lennox recommendations for the slightly. compressor to be covered under warranty. Refer to the En- 2. - Page 5 If the com- The scroll compressor design is simple, efficient and re- pressor is replaced, conventional Lennox cleanup practic- quires few moving parts. A cutaway diagram of the scroll es must be used.
- Page 6 HOW A SCROLL WORKS MOVEMENT OF ORBIT SUCTION SUCTION INTERMEDIATE PRESSURE CRESCENT SHAPED GAS POCKET ORBITING SCROLL SUCTION POCKET FLANKS SEALED BY STATIONARY SCROLL CENTRIFUGAL SUCTION FORCE SUCTION HIGH DISCHARGE PRESSURE POCKET FIGURE 7 B−Capacitor (C12) sure conditions and is permanently adjusted to trip (open) at 40 + 5 psi.
- Page 7 It is recommended that a liquid line filter drier be replaced introduced to the oil. Table 1 lists kits available from Lennox when the pressure drop across the filter drier is greater to check POE oils.
- Page 8 TABLE 2 Lennox System Operation Monitor LED Troubleshooting Codes Status LED Condition Status LED Description Status LED Troubleshooting Information Green Power" LED ON Module has power 24VAC control power is present at the module terminal. Green Power" LED Module not powering up Determine/verify that both R and C module terminals are connected and voltage is present between both terminals.
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Page 9: Led Functions
I−Lennox System Operation Monitor (A132) Thermostat The Lennox system operation monitor (LSOM) requires a The Lennox system operation monitor (LSOM) is a 24 volt two-stage room thermostat to operate properly. powered module, (see diagnostic module A132 on wiring L terminal connection The L connection is used to com- diagram and figure 10) wired directly to the indoor unit. -
Page 10: Refrigerant System
Field refrigerant piping consists of liquid and vapor lines TABLE 4 from the outdoor unit (sweat connections) to the indoor coil (flare or sweat connections). Use Lennox L15 (sweat, non- Part Recommended Torque flare) series line sets as shown in table 3 or use field-fabri- Service valve cap 8 ft.−... -
Page 11: Charging
To Close Service Valve: Ball Valve (Valve Closed) 1 − Remove the stem cap with an adjustable wrench. 2 − Use a service wrench with a hex−head extension to Use Adjustable Wrench To open: rotate Stem Clockwise 90°. turn the stem clockwise to seat the valve. Tighten the To close: rotate Stem Counter-clockwise 90°. - Page 12 6 − After a few minutes, open a refrigerant port to check WARNING that an adequate amount of refrigerant has been add- ed for detection (refrigerant requirements will vary Refrigerant can be harmful if it is inhaled. Refrigerant with line lengths). Check all joints for leaks. Purge ni- must be used and recovered responsibly.
- Page 13 der with pressure regulator set to 150 psig (1034 kPa) Charge Using the Approach Method Outdoor Temp. >65ºF (18ºC) and purge the hose. Open the manifold gauge valves The following procedure is intended as a general guide and to break the vacuum in the line set and indoor unit. is for use on expansion valve systems only.
- Page 14 TABLE 7 XC15 Normal Operating Pressures In psig (liquid +/− 10 and vapor+/− 5 PSIG)* −024 −030 −036 −042 −048 −060 Model 5F (5C)** Liquid Suction Liquid Suction Liquid Suction Liquid Suction Liquid Suction Liquid Suction 65 (18.3) 70 (21.1) 75 (23.9) 80 (26.7) 85 (29.4)
- Page 15 OUTDOOR UNIT (Uncased Coil Shown) OUTDOOR COIL HIGH PRESSURE PRESSURE SUCTION LINE LIQUID LINE GAUGE SERVICE VALVE SERVICE VALVE MANIFOLD FILTER DRIER HFC−410A COMPRESSO DRUM FIGURE 14 1. Determine the desired DT Measure entering air temperature Temp. using dry bulb (A) and wet bulb (B). DT is the intersecting value of A 24 24 24 23 23 22 22 22 20 19 18 17 16 15 of air and B in the table (see triangle).
- Page 16 1. Check Liquid and suction line pressures START: Measure outdoor ambient temperature 2. Compare unit pressures with Table 10, Normal Operating Pressures. BELOW 3. Conduct leak check; evacuate USE EITHER APPROACH Above or previously outlined. OR SUBCOOLING below 65ºF 4. Weigh in the unit nameplate charge plus METHOD charge required...
- Page 17 1. Confirm proper airflow across coil using figure START: Measure outdoor ambient temperature 2. Compare unit pressures with Table 10, Normal Operating Pressures. ABOVE 3. Use SUBCOOLING to correctly charge unit or to USE WEIGH-IN METHOD DO NOT CHARGE UNIT verify the charge is correct.
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Page 18: Service And Recovery
TABLE 10 Normal Operating Pressures (Liquid +10 and Suction +5 psig) Use this table to perform maintenance checks; it is not a procedure for charging the system. Minor variations in these pressures may be due to differences in IMPORTANT installations. Significant deviations could mean that the system is not properly charged or that a problem exists with some component in the system. -
Page 19: Maintenance
RIGHT TOP TOP CABLE TIE 1. Put SR1 base on unit base pan. LEFT 2. Install compressor on base. 3. Cover SR1 base with wet rags to protect against any brazing material. MIDDLE CABLE TIE 4. Braze suction tube. SUCTION 5. - Page 20 VIII−DIAGRAMS / OPERATING SEQUENCE A− Unit Diagram XC15−024/060−1P Sequence of Operation End of Cooling Demand Cooling Demand 4 Cooling demand is satisfied. Terminal Y1 is de−energized. 1 Cooling demand initiates at Y1 in the thermostat. 5 Contactor K1 is de−energized. 2 Voltage from terminal Y passes through the TOC (if used) 6 K1−1 opens, compressor B1 and outdoor fan B4 are de−ener- through S4 high pressure switch, energizes K1 compressor...
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