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Service Literature
The XC13 is a high efficiency residential split−system con-
densing unit, which features a scroll compressor and
R−410A refrigerant. XC13 units are available in sizes rang-
ing from 1 1/2 through 5 tons. The series is designed for use
with an expansion valve or RFC (approved for use with
R−410A) in the indoor unit. This manual is divided into sec-
tions which discuss the major components, refrigerant sys-
tem, charging procedure, maintenance and operation se-
quence.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are sub-
ject to change.
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
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 operation
in a corrosive atmosphere (chlorine, fluorine, salt,
recycled waste water, urine, fertilizers, or other dam-
aging chemicals).
DANGER
Shock Hazard
Remove all power at disconnect
before removing access panel.
Single phase XC13 units use single-
pole contactors. Potential
exists for electrical shock resulting
in injury or death.
Line voltage exist at all components
(even when unit is not in operation).
Corp. 0521−L9
Revised 12−2005
XC13 SERIES UNITS
Operating pressures of this R−410A unit are higher
than pressures in R−22 units. Always use service
equipment rated for R410A.
General
Specifications / Electrical Data
I Application
II Unit Components
III Refrigeration System
IV Charging
V Service and Recovery
VI Maintenance
VII Wiring and Sequence of Operation
Page 1
IMPORTANT
TABLE OF CONTENTS
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©2005 Lennox Industries Inc.
XC13
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Summary of Contents for Lennox XC13 Series
- Page 1 XC13 Corp. 0521−L9 Revised 12−2005 Service Literature XC13 SERIES UNITS The XC13 is a high efficiency residential split−system con- densing unit, which features a scroll compressor and R−410A refrigerant. XC13 units are available in sizes rang- ing from 1 1/2 through 5 tons. The series is designed for use with an expansion valve or RFC (approved for use with R−410A) in the indoor unit.
- Page 2 SPECIFICATIONS General Model No. XC13−018 XC13−024 XC13−030 XC13−036 XC13−042 XC13−048 XC13−060 Data Nominal Tonnage Connections Liquid line (o.d.) − in. (mm) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) (sweat) Suction line (o.d.) − in. (mm) 3/4 (19.1) 3/4 (19.1) 3/4 (19.1)
- Page 3 3 -1/2, 4 and 5 ton capacities. All major components (indoor Panel shown slightly rotated to allow top tab to exit (or enter) top blower and coil) must be matched according to Lennox rec- slot for removing (or installing) panel.
- Page 4 2 − Dual Capacitor C12 Rotate panel to vertical to fully engage all tabs. The compressor and fan in XC13 series units use perma- Holding the panel’s hinged side firmly in place, close the nent split capacitor motors. The capacitor is located in- right−hand side of the panel, aligning the screw holes.
- Page 5 The scroll is a simple compression concept centered around CROSS−SECTION OF SCROLLS the unique spiral shape of the scroll and its inherent properties. DISCHARGE Figure 5 shows the basic scroll form. Two identical scrolls are STATIONARY SCROLL DISCHARGE PRESSURE mated together forming concentric spiral shapes (figure 6). One scroll remains stationary, while the other is allowed to "orbit"...
- Page 6 The liquid is worked toward the center screws of the scroll and is discharged. If the compressor is replaced, conventional Lennox cleanup practices must be used. Due to its efficiency, the scroll compressor is capable of draw- ing a much deeper vacuum than reciprocating compressors.
- Page 7 Tighten the from the condensing unit (sweat connections) to the indoor stem firmly. evaporator coil (sweat connections). Use Lennox L15 NOTE − Use a 3/16" hex head extension for 3/8" line (sweat) series line sets as shown in table 1.
- Page 8 Ball Valve (Valve Open) WARNING Use Adjustable Wrench To open: rotate Stem Clockwise 90°. Danger of explosion: Can cause equipment damage, To close: rotate Stem Counter-clockwise 90°. injury or death. When using a high pressure gas such as dry nitrogen to pressurize a refrigeration or air con- stem cap ditioning system, use a regulator that can adjust the to outdoor coil...
- Page 9 8 − Reconnect the manifold gauge to the vacuum pump, IMPORTANT turn the pump on, and continue to evacuate the line set and indoor unit until the absolute pressure does not rise Use a thermocouple or thermistor electronic vacuum above 500 microns (29.9 inches of mercury) within a gauge that is calibrated in microns.
- Page 10 Factory Charge times to achieve the required dryness level. If system dryness is not verified, the compressor Units are factory charged with the amount of R−410A refrig- erant indicated on the unit rating plate. This charge is based will fail in the future. on a matching indoor coil and outdoor coil with 15 ft.
- Page 11 Charge Using Subcooling Method, Fixed Orifice TABLE 4 Systems Outdoor Temp. > 65ºF (18ºC) R−410A Temperature (°F) − Pressure (Psig) If charging a fixed orifice system when the outdoor ambient °F Psig °F Psig °F Psig °F Psig is 65_F (18_C) or above, use the subcooling method to charge the unit.
- Page 12 Charge Using the Approach Method, TXV Sys- 3 − Use the same digital thermometer you used to check the tems Outdoor Temperature > 65ºF (18ºC) outdoor ambient temperature to check the liquid line The following procedure is intended as a general guide and is temperature.
- Page 13 V − SERVICE AND RECOVERY VI − MAINTENANCE WARNING WARNING Electric shock hazard. Can cause inju- ry or death. Before attempting to per- Polyol ester (POE) oils used with R−410A refrigerant form any service or maintenance, turn absorb moisture very quickly. It is very important the electrical power to unit OFF at dis- that the refrigerant system be kept closed as much connect switch(es).
- Page 14 VII − WIRING DIAGRAMS AND SEQUENCE OF OPERATION XC13 NOTE− The thermostat used may be electromechanical or electronic. NOTE− Transformer in indoor unit supplies power (24 VAC) to the thermostat and outdoor unit controls. COOLING: 1− Cooling demand initiates at Y1 in the thermostat. 5 −...
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