Lennox XC16?024 Unit Information
High efficiency residential split−system condensing unit
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Also See for XC16?024:
- User manual (28 pages) ,
- Specification (24 pages) ,
- Installation instructions manual (23 pages)
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Service Literature
The XC16 is a high efficiency residential split−system con-
densing unit, which features a two speed scroll compressor
and R−410A refrigerant. XC16 units are available in 2, 3, 4
and 5 tons. XC16 units are rated for 230 volts only. Applica-
tions where supply voltage is less requires a hard start kit.
The series is designed for use with an expansion valve (ap-
proved for use with R−410A) in the indoor unit. This manual
is divided into sections which discuss the major compo-
nents, refrigerant system, charging procedure, mainte-
nance and operation sequence.
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 XC16 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. 0625−L5
Revised 07−2006
XC16 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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©2006 Lennox Industries Inc.
XC16
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Table of Contents
Related Manuals for Lennox XC16?024
Summary of Contents for Lennox XC16?024
- Page 1 VI Maintenance ..... . Page 16 VII Wiring and Sequence of Operation Page 17 ©2006 Lennox Industries Inc. Page 1...
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Page 2: Specifications
SPECIFICATIONS General Model No. XC16−024 XC16−036 XC16−048 XC16−060 Data Nominal Tonnage Connections Liquid line (o.d.) − in. (sweat) Suction line (o.d.) − in. 1−1/8 Refrigerant R−410A charge furnished 7 lbs. 5 oz. 8 lbs. 9 oz. 11 lbs. 4 oz. 14 lbs. -
Page 3: Unit Components
All major components (indoor blower and coil) must be Panel shown slightly rotated to allow top tab to exit (or enter) top matched according to Lennox recommendations for the com- slot for removing (or installing) panel. pressor to be covered under warranty. Refer to the Engineer- ing Handbook for approved system matchups. -
Page 4: Electrostatic Discharge (Esd)
Position and Install Panel Position the panel almost par- 1 − Compressor Contactor (K1) allel with the unit (figure 2, Detail D) with the screw side" as The compressor is energized by a single−pole contactor lo- close to the unit as possible. Then, in a continuous motion: cated in the control box. - Page 5 If the com- scrolls are mated together forming concentric spiral shapes pressor is replaced, conventional Lennox cleanup practices (figure 3 ). One scroll remains stationary, while the other is must be used.
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Page 6: Two−Stage Operation
TWO−STAGE OPERATION operation. The compressor will operate on first−stage until demand is satisfied or the indoor temperature reaches the NOTE − During operation, the head of a scroll compressor thermostat set point calling for second−stage. may be hot since it is in constant contact with discharge gas. - Page 7 INTERNAL SOLENOID (L34) Procedure 1 − Turn main power "OFF" to outdoor unit. The internal unloader solenoid controls the two−stage op- 2 − Adjust room thermostat set point above (heating opera- eration of the compressor by shifting a slide ring mechanism tion on heat pump) or below (cooling operation) the to open two by−pass ports in the first compression pocket of room temperature 5ºF.
- Page 8 TABLE 1 Cooling Operation Unit Readings Unit Readings Y1 − 1st-Stage Expected Results Y2 − 2nd-Stage Compressor Voltage Same Amperage Higher Condenser Fan motor Amperage Same or Higher Temperature Ambient Same Outdoor Coil Discharge Air Higher Compressor Discharge Line Higher Indoor Return Air Same Indoor Coil Discharge Air...
- Page 9 It is recommended that a liquid line filter drier be replaced introduced to the oil. Table 2 lists kits available from Lennox when the pressure drop across the filter drier is greater than to check POE oils.
- Page 10 D − Condenser Fan Motor (B4) All units use single−phase PSC fan motors which require a run capacitor. In all units, the condenser fan is controlled by the compressor contactor. ELECTRICAL DATA tables in this manual show specifi- cations for condenser fans used in XC16’s. ALIGN FAN HUB FLUSH WITH END OF SHAFT FIGURE 5 Access to the condenser fan motor on all units is gained...
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Page 11: Refrigerant System
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 12 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 13 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 14 TABLE 2 4 − Record outdoor ambient temperature using a digital ther- mometer. Refrigerant Charge per Line Set Lengths 5 − When the heating demand has been satisfied, switch the Liquid Line Oz. per 5 ft. (g per 1.5 m) adjust Set Diameter from 15 ft.
- Page 15 5 − Compare the subcooling value with those in table 4. If NOTE − Use the same digital thermometer you used to check the outdoor ambient temperature to check the liq- subcooling is greater than shown, recover some refrig- uid line temperature. erant.
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Page 16: Service And Recovery
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 17 VII − WIRING DIAGRAMS AND SEQUENCE OF OPERATION Page 17...
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Page 18: Service Notes
SERVICE NOTES Page 18... - Page 19 SERVICE NOTES Page 19...