Lennox Collection XC21 System Installation Instructions Manual
  1. Manuals
  2. Brands
  3. Lennox Manuals
  4. Air Conditioner
  5. XC21
  6. Installation instructions manual
Lennox Collection XC21 System Installation Instructions Manual

Lennox Collection XC21 System Installation Instructions Manual

Dave lennox signature air conditioner
Hide thumbs Also See for Collection XC21 System:
Table of Contents

Advertisement

Quick Links

See also: Engineering Data
Enlarged version
E2011 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.
NOTICE TO INSTALLER
UNIT PLACEMENT
It is critical for proper unit operation to place outdoor unit on an
elevated surface as described in Unit Placement section on page 7.
BRAZING LINE SET TO SERVICE VALVES
It is imperative to follow the brazing technique illustrated starting on
page 12 to avoid damaging the service valve's internal seals.
NOTICE
A thermostat is not included and must be ordered
separately.
D The Lennox icomfort Touch
in communicating applications.
D In non−communicating applications,
®
ComfortSense
7000 thermostat may be used, as well
as other non−communicating thermostats.
In all cases, setup is critical to ensure proper system
operation.
Field
wiring
examples
applications begin on page 23.
See the icomfort Toucht thermostat Quick Start Guide
for communicating and partial communicating field
wiring connections.
06/11
*2P0611*
®
thermostat must be used
the Lennox
for
non−communicating
INSTALLATION
INSTRUCTIONS
Dave Lennox Signature
Collection XC21 System
AIR CONDITIONER
506587−01
06/11
Supersedes 10/10

TABLE OF CONTENTS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
®
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

General

This outdoor unit is designed for use with HFC−410A
refrigerant only. This unit must be installed with an
approved indoor air handler or coil. See the Lennox XC21
Engineering Handbook for approved indoor component
matchups.
Page 1
. . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . .
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . .
. . . . . . . . . . .
. . . . . . . . . . . . . .
506587−01
*P506587-01*
®
Litho U.S.A.
1
2
2
3
4
4
4
. . . . .
6
7
9
10
12
15
16
17
17
19
22
23
25
25
25
29
30
. . . . .
37
42
49
50
50

Advertisement

Table of Contents
loading

Related Manuals for Lennox Collection XC21 System

Summary of Contents for Lennox Collection XC21 System

  • Page 1: Table Of Contents

    23. refrigerant only. This unit must be installed with an See the icomfort Toucht thermostat Quick Start Guide approved indoor air handler or coil. See the Lennox XC21 for communicating and partial communicating field Engineering Handbook for approved indoor component wiring connections.

  • Page 2: Unit Dimensions

    Unit Dimensions − Inches (mm) and Parts Arrangement DISCHARGE 39−1/2 35−1/2 ELECTRICAL (1003) (902) INLETS (1194) SUCTIOn LINE INLET 4−1/2 (114) LIQUID LINE INLET 18−1/2 (470) 8 (203) SIDE VIEW 1 (25) ACCESS VIEW UNIT SUPPORT FEET 26−7/8 (683) 16−7/8 (429) 8−3/4 (222)

  • Page 3: Typical Unit Parts Arrangement

    Typical Unit Parts Arrangement SECOND GROUND LUG FOR SOURCESOURCE ® FAN MOTOR (A177) CONTROL GROUND LUG CONTACTOR−1 POLE (K1) HIGH VOLTAGE FIELD CONNECTIONS WIRE TIE OUTDOOR AMBIENT TEMPERATURE CAPACITOR (C12) SENSOR (RT13) AIR CONDITIONER CONTROL (A175) HIGH DISCHARGE LINE TEMPERATURE SENSOR (RT28) COMPRESSOR HARNESS FIELD CONNECTION FOR SUCTION LINE...

  • Page 4: Shipping And Packing List

    Check unit for shipping damage. Consult last carrier recess. immediately if damage is found. See the Lennox Service and Application Notes #C−08−1 Assembled outdoor unit. for further details and information. Bag assembly which includes the following: Page 4 506587−01...

  • Page 5: Service Valves

    SERVICE VALVES ANGLE AND BALL Operating Angle Type Service Valve: 1. Remove stem cap with an appropriately sized wrench. 2. Use a service wrench with a hex−head extension (3/16" for liquid line valve sizes and 5/16" for vapor line valve sizes) to back the stem out counterclockwise as far as it will go.

  • Page 6: Recovering Refrigerant From Existing System

    Recovering Refrigerant from Existing System DISCOnNECT POWER COnNECT MANIFOLD GAUGE SET Disconnect all power to the existing outdoor unit at the disconnect Connect a gauge set, clean recovery cylinder and a recovery switch or main fuse box/breaker panel. machine to the service ports of the existing unit. Use the instruction provided with the recovery machine to make the connections.

  • Page 7: Unit Placement

    MINIMUM CLEARANCE CLEARANCE ON ALL SIDES INCHES (MILLIMETERS) ABOVE UNIT 6 (152) ACCESS PANEL NOTES: CONTROL PANEL 48 (1219) ACCESS CLEARANCE TO LOCATION OTHER THREE SIDES MUST BE 36 30 (762) 12 (305) INCHES (914MM). CLEARANCE TO REMAINING TWO SIDES MAY BE 12 INCHES (305MM) AND THE FINAL SIDE MAY BE 6 INCHES (152MM).
  • Page 8 DETAIL A Outside Unit Placement DETAIL B Slab Mounting at Ground Level Install unit level or, if on a slope, maintain slope tolerance of two (2) INSTALL UNIT AWAY FROM WINDOWS degrees (or two inches per five feet [50 mm per 1.5 m]) away from building structure.

  • Page 9: Removing And Installing Panels

    ROOF MOUNTING Removing and Installing Panels Install the unit a minimum of six inches (152 mm) above the See figure 6 for information on removing and installing unit roof surface to avoid ice build−up around the unit. Locate panels. the unit above a load bearing wall or area of the roof that can adequately support the unit.

  • Page 10: New Or Replacement Line Set

    Pay close attention to line set isolation during To obtain the correct information from Lennox, be sure to installation of any HVAC system. When properly isolated communicate the following information: from building structures (walls, ceilings.
  • Page 11 Line Set Isolation The following illustrations are examples of proper refrigerant line set isolation: REFRIGERANT LINE SET INSTALLING REFRIGERANT LINE SET TRANSITION VERTICAL RUNS (NEW CONSTRUCTION SHOWN) FROM VERTICAL TO HORIZONTAL NOTE Insulate liquid line when it is routed through areas where the surrounding ambient temperature could become higher than the temperature of the liquid line or when pressure drop is equal to or greater ANCHORED HEAVY NYLON...

  • Page 12: Brazing Connections

    Brazing Connections IMPORTANT Use the procedures outline in figures 8 and 9 for brazing Connect gauge set low pressure side to vapor line line set connections to service valves. service valve and repeat procedure starting at paragraph 4 for brazing the liquid line to service port WARNING valve.
  • Page 13 CAP AND CORE REMOVAL PIPING PANEL REMOVAL AND PREPARING LINE Remove service cap and core from both the suction / vapor and liquid line service ports. Remove piping panel for easier access to service valves. Cut ends SERVICE PORT CAP of the refrigerant lines square (free from nicks or dents) and debur the ends.
  • Page 14 WRAP SERVICE VALVES To help protect service valve seals during brazing, wrap water saturated cloths around service valve bodies and copper tube stubs. Use additional water saturated cloths underneath the valve body to protect the base paint. FLOW NITROGEN WARNING Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration 1.

  • Page 15: Flushing Line Set And Indoor Coil

    Flushing Line Set and Indoor Coil TYPICAL EXISTING FIXED ORIFICE TYPICAL EXISTING EXPANSION VALVE REMOVAL REMOVAL PROCEDURE (UNCASED PROCEDURE (UNCASED COIL SHOWN) COIL SHOWN) STUB END TWO PIECE PATCH PLATE LIQUID LINE CHECK DISTRIBUTOR TUBES (UNCASED COIL ONLY) ORIFICE EXPANSION LIQUID LINE ORIFICE HOUSING HOUSING VALVE...

  • Page 16: Installing Indoor Expansion Valve

    Installing Indoor Expansion Valve 1/2 Turn INDOOR EXPANSIOn VALVE INSTALLATIOn Remove the field−provided fitting that temporary reconnected the liquid line to the indoor unit’s distributor TWO PIECE 11 12 assembly. (Uncased Coil Shown) PATCH PLATE (UNCASED ® Install one of the provided Teflon rings around the STUB LIQUID LINE...

  • Page 17: Leak Test Line Set And Indoor Coil

    1 or 2 psig (6.9 to 13.8 kPa). and line set must be flushed prior to installation. Take care to empty all existing traps. Polyol ester (POE) oils are used in Lennox units charged with HFC−410A WARNING refrigerant. Residual mineral oil can act as an insulator, preventing proper heat transfer.
  • Page 18 Evacuating Line Set and Indoor Coil CONNECT GAUGE SET HIGH NOTE Remove cores from service valves (if not already done). Connect low side of manifold gauge set with 1/4 SAE in−line tee to vapor line service valve Connect high side of manifold gauge OUTDOOR set to liquid line service valve MANIFOLD...

  • Page 19: Electrical

    defined as any gas that will not condense under IMPORTANT temperatures and pressures present during operation of an air conditioning system. Non−condensables and water Use a thermocouple or thermistor electronic vacuum suction combine with refrigerant to produce substances gauge that is calibrated in microns. Use an instrument that corrode copper piping and compressor parts.
  • Page 20 A. ROUTE COnTROL WIRES NOn−COMMUNICATING Install low voltage control wiring from outdoor to indoor unit and from thermostat to indoor unit. COnTROL BOX Run 24VAC control wires through hole with grommet. Make 24VAC control wire connections to heat pump control (A175) . NOTE Do not bundle any excess 24VAC control wires inside control box.
  • Page 21 Figure 14. Typical XC21 Wiring Page 21 XC21 SERIES...

  • Page 22: Air Conditioner Control (A175) Jumpers And Terminals

    Air Conditioner Control (A175) Jumpers and Terminals Table 3. Air Conditioner Control Jumpers and AIR COnDITIOnER COnTROL − TWO−STAGE Terminals Board ID Label Description Table 3 provides additional information concerning PSC Fan 240 VAC output connection for outdoor fan. jumpers, links, and connections for the air conditioner PSC Fan 240 VAC input connection for outdoor fan.

  • Page 23: Field Control Wiring

    Field Control Wiring The following two illustrations provide examples on how to install control wiring using a non−communicating thermostat. For examples of how to install control wiring in complete or partial communicating systems, see the icomfort Touch ® thermostat Quick Start Guide which is provided with the thermostat. Air Handler ComfortSense[ 7000 Thermostats Catalog # Y0349 or Y2081...
  • Page 24 Furnace ComfortSense[ 7000 Thermostats Catalog # Y0349 or Y2081 XC21 Two−Stage Air Conditioner Control On−board link Low voltage thermostat wiring 1. Thermostat T terminals are used for outdoor sensor input. Use for thermostat’s outdoor temperature display (optional). ® 2. R to L connection is required for this model when using the ComfortSense 7000 −...

  • Page 25: Servicing Unit Delivered Void Of Charge

    3. After evacuation is complete, open both the liquid and Servicing Units Delivered Void of Charge vapor line service valves to release the refrigerant charge contained in outdoor unit into the system. If the outdoor unit is void of refrigerant, clean the system using the procedure described below.
  • Page 26 ADDING OR REMOVING REFRIGERANT This system uses HFC−410A refrigerant which operates at much higher pressures than HCFC−22. The pre−installed liquid line filter drier is approved for use with HFC−410A only. Do not replace it with components designed for use with HCFC−22. This unit is NOT approved for use with coils which use capillary tubes or fixed orifices as a refrigerant metering device.
  • Page 27 WEIGH IN to initially charge a system when the outdoor unit is void of charge. To verify charge and add or APPROACH SUBCOOLING remove refrigerant use either methods. WHEN TO CHARGE? START: Determine the correct charge method: Warm weather best Can charge in colder weather CHARGE METHOD? Determine by: Outdoor ambient temperature...
  • Page 28 APPROACH 1. Confirm proper airflow across coil using figure 19. 2. Compare unit pressures with table 4, Normal Operating Pressures. TEST AND CHARGE METHOD 3. Use APPROACH to correctly charge unit or to verify the charge is 65ºF (18.3ºC) AND ABOVE correct.

  • Page 29: Operating And Temperature Pressures

    Operating and Temperature Pressures Minor variations in these pressures may be expected due to differences in installations. Significant differences could mean that the system is not properly charged or that a problem exists with some component in the system. Table 4. Normal Operating Pressures (Liquid +10 and Suction +5 psig)* Use this table to perform maintenance checks;...

  • Page 30: System Operations

    INSTALLING ISOLATION GROMMETS In non−communicating systems the delay is set for 300 seconds (five minutes) and can not be changed. To Locate the isolation grommets (provided). Slide grommets override timer when active or inactive, place a jumper on onto vapor and liquid lines. Insert grommets into piping the field test pins between 1 and 2 seconds.
  • Page 31 High Discharge Line Temperature Sensor (RT28) See table 6 for sensor range. The high discharge line Ambient Air temperature sensor (location shown in figure 1 monitors Temperature Sensor 10K resistor temperature range and open/short conditions. See figure 29 for the high discharge line temperature sensor sequence of operation.
  • Page 32 INITIAL TRIP COMPRESSOR PRESSURE SWITCH IS Y1 DEMAND CLOSED COnTACTOR SWITCH (S87) IGNORED FOR ENERGIZED 90 SECOnDS SWITCH IS CLOSED OR OUTDOOR PRESSURE OPEN CLOSED AMBIENT TEMPERATURE IS 15ºF SWITCH (S87) OR BELOW COMPRESSOR If 5−strike counter has four or less strikes when Y1 demand is COnTACTOR terminated or satisfied, the strike counter will reset to zero.
  • Page 33 HIGH COMPRESSOR PRESSURE CLOSED Y1 DEMAND COnTACTOR SWITCH (S4) ENERGIZED HIGH PRESSURE CLOSED OPEN SWITCH (S4) COMPRESSOR If 5−strike counter has four or less strikes when Y1 demand is terminated COnTACTOR ® or satisfied, the strike counter will reset to zero. In a icomfort Touch DE−ENERGIZED thermostat enabled setup, the thermostat will terminate demand when the compressor contactor is de−energized.
  • Page 34 If temperature is at or above 279ºF. DISCHARGE COMPRESSOR Y1 DEMAND CLOSED SENSOR COnTACTOR (RT28)* ENERGIZED HIGH PRESSURE CLOSED OPEN SWITCH (S4) COMPRESSOR COnTACTOR If 5−strike counter has four or less strikes when Y1 demand is terminated ® DE−ENERGIZED or satisfied, the strike counter will reset to zero. In a icomfort Touch thermostat enabled setup, the thermostat will terminate demand when the compressor contactor is de−energized.
  • Page 35 Table 7. Ambient Sensor (RT13) Temperature / Resistance Range Degrees Degrees Degrees Degrees Resistance Resistance Resistance Resistance Fahrenheit Fahrenheit Fahrenheit Fahrenheit 136.3 2680 56.8 16657 21.6 44154 −11.3 123152 133.1 2859 56.0 16973 21.0 44851 −11.9 125787 130.1 3040 55.3 17293 20.5 45560...
  • Page 36 Table 8. High Discharge (RT28) Sensor Temperature / Resistance Range Degrees Degrees Degrees Degrees Resistance Resistance Resistance Resistance Fahrenheit Fahrenheit Fahrenheit Fahrenheit 303.1 186.1 1052 136.8 2656 94.5 6613 298.1 185.0 1072 136.0 2698 93.6 6739 293.4 183.9 1093 135.2 2740 92.8 6869...

  • Page 37: System Status, Fault And Lockout Led Codes

    System Status, Fault and Lockout LED IMPORTANT Codes DS15 and DS13 compressor LED fault and lockout LED codes are displayed using various LEDs located on codes do not provide safety protection. The is a the air conditioner control (A175). See figure 15 for location monitoring function only and cannot control or shut down of air conditioner control LEDs.
  • Page 38 Table 9. System Status, Fault and Lockout LED Codes and Related icomfort Touch ® Thermostat Alert Codes System fault and lockout LED (DS11 / DS14) alarm codes takes precedence over system status LED codes (cooling, heating stages or defrost/dehumidification). Only the latest active LED fault or lockout alarm code if present will be displayed. If no fault or lockout codes are active, then system status LEDs are routinely displayed.
  • Page 39 System fault and lockout LED (DS11 / DS14) alarm codes takes precedence over system status LED codes (cooling, heating stages or defrost/dehumidification). Only the latest active LED fault or lockout alarm code if present will be displayed. If no fault or lockout codes are active, then system status LEDs are routinely displayed.
  • Page 40 Table 10. Compressor Fault and Lockout LED Codes and Related icomfort Touch ® Thermostat Alert Codes NOTE See notes 1 and 2 in table below for duration of fast / slow flashes and pause. Air Conditioner icomfort Control LEDs ® Possible Touch Condition...
  • Page 41 Air Conditioner icomfort icomfort Control LEDs ® ® Possible Possible Touch Touch Condition Condition Solution Solution Clearing Status Clearing Status Cause(s) Cause(s) Thermostat Thermostat DS15 DS13 Display Display Yellow Compressor has Run capacitor has failed. a locked out due Low line voltage (contact utility if voltage at to run capacitor Clears after power disconnect is low).

  • Page 42: Field Configuration And Testing

    FAN MOTOR CONTROL (A177) LED CODES AND Field Configuration and Testing SEQUENCE OF OPERATION This section provides procedures for configuring, This section provides information concerning operation adjusting and testing various components of this unit. and testing of the fan control. Fan Motor Control Sequence of Operation Fan Motor (B4) Test Procedure During start up, the following sequence is followed:...
  • Page 43 Table 11. Two Stage Fan Motor Control RPM, LED Code and DC Voltage Output EDA Operation CFM Profile Pin Select Low Stage ECM1/Y1 High Stage ECM1/Y1 ECM2/Y2 Only Only and ECM2/Y2 Application DC Volt DC Volt DC Volt Code Code Code XC21−024 15.1...
  • Page 44 DEMAND BEGINS DEFAULT MISMATCHED REPLACE FAN MOTOR FAN MOTOR CONTROL BOARD LED CONTINUOUS FAST SPEED USED FLASH DEFAULT FAN REPLACE FAN MOTOR MOTOR FAILURE LED CONSTANT ON CONTROL BOARD SPEED USED FAN MOTOR LED STAGE INDICATOR: ONE STAGE ECM1/Y1 RPM SET PER OnE slow FLASH AND (LOW) ONLY...

  • Page 45: Control Panel

    CFM Profile Pin Select FAN MOTOR CONTROL (A177) PULSE−WIDTH MODULATION (PWM) JUMPER JUMPER CONTROL PANEL CONDITIONER CONTROL (A175) VERIFY DC VOLTAGE OUTPUT USING FAN PWM OUT AND COM TERMINALS. SEE TABLE 11 FOR OPTIMAL DC VOLTAGE BASED ON CFM PROFILE USED. FAN PWM OUT GREEN GREEN...
  • Page 46 CONTROL PANEL FAN MOTOR CONTROL (A177) PULSE−WIDTH MODULATION (PWM) INPUT VOLTAGES DURING DEMAND ECM/Y1 ONLY − 24VDC BOTH ECM/Y1 AND ECM/Y2 − 24VDC AT EACH INPUT ECM/Y2 ONLY − 24VDC YELLOW WIRE CONDITIONER BLUE WIRE CONTROL (A175) BLACK WIRE ONE YELLOW WIRE FROM PS (E24) TERMINAL ON AIR CONDITIONER CONTROL.
  • Page 47 TOP GRILLE OR FAN MOTOR MOUNT ADJUSTMENT FOR FAN CLEARANCE Sometimes during shipping, either the fan motor mounting or top grille may become out of alignment. This may cause the fan motor blade to not clear the orifice ring. If this situation occurs, simply adjust either or both the fan motor mount or top grille positions to allow proper clearance.
  • Page 48 AIR CONDITIONER CONTROL (A175) UNIT NOMINAL CAPACITY CODE CONFIGURATION In a communicating system, if the room thermostat is indicating either a error code 313, indoor and outdoor unit capacity mismatch error code, or error code 34, must program unit capacity for outdoor unit (see figure 35). START FINISH DS14 (Red)

  • Page 49: Maintenance (Dealer And Homeowner)

    1. Clean coil if necessary. supervisor. 2. Check connecting lines, joints and coil for evidence of Lennox Industries Inc. oil leaks. P.O. Box 799900 3. Check condensate line and clean if necessary.

  • Page 50: Sunsource ® Home Energy System

    Units can be upgraded for use with solar equipment at the 1. Air Filter Ask your Lennox dealer to show you time of installation or in the future. where your indoor unit’s filter is located. It will be either...
  • Page 51 3. Remove control access panel. Install refrigeration 8. Close switch to energize Y2 demand. Verify power is gauges on unit. Attach the amp meter to the common going to compressor solenoid (see note ** in the Field (black wire) wire of the compressor harness. Attach Operational Checklist on page 51).
  • Page 52 XC21 Start−Up and Performance Checklist Customer Address Indoor Unit Model Serial Outdoor Unit Model Serial Notes: START UP CHECKS Refrigerant Type: First Stage: Rated Load Amps Actual Amps Rated Volts Actual Volts Second Stage: Rated Load Amps Actual Amps Rated Volts Actual Volts Condenser Fan Full Load Amps Actual Amps: First Stage...

Table of Contents