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E2009 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
WARNING
Improper
installation,
service or maintenance can cause personal injury,
loss of life, or damage to property.
Installation and service must be performed by a
licensed professional installer (or equivalent) or a
service agency.
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 near these areas during
installation or while servicing this equipment.
IMPORTANT
This unit must be matched with an indoor coil as
specified in Lennox' Engineering Handbook.
Coils previously charged with HCFC−22 must be
flushed.
IMPORTANT
The Clean Air Act of 1990 bans the intentional
venting of refrigerant (CFCs, HCFCs AND HFCs) as
of July 1, 1992. Approved methods of recovery,
recycling or reclaiming must be followed. Fines
and/or
incarceration
noncompliance.
06/09
*2P0609*
adjustment,
alteration,
may
be
levied
for
INSTALLATION
INSTRUCTIONS
Dave Lennox Signature
Collection XP19 Series
Units
HEAT PUMPS
505,331M
06/09
Supersedes 05/09
Table of Contents
Shipping and Packing List
Unit Dimensions
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XP19 Heat Pumps
General Information
Recovering Refrigerant from Existing System
Removing Existing Outdoor Unit
Positioning New Outdoor Unit
Removing Panels
New or Replacement Line Set
Brazing Connections
Removing Indoor Unit Metering Device
Flushing the System
Installing New Indoor Unit Metering Device
Testing for Leaks
Evacuating the System
Servicing Unit Delivered Void of Charge
Electrical Connections
Start−Up and Charging Procedures
System Operations
Lennox System Operation Monitor (LSOM)
Defrost System
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Maintenance
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Two−Stage Compressor Check−out
Homeowner Information
Field Operational Checklist
Start−up and Performance Checklist
Shipping and Packing List1
Check the unit for shipping damage and listed times below
are intact. If damaged, or if parts are missing, immediately
contact the last shipping carrier.
1
Assembled outdoor unit.
1
Bag assembly which contains the followings:
1
Bushing (for low voltage wiring
2
Isolation grommets for liquid and suction lines
Figure 1. Bag Assembly (Parts)
Page 1
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ISOLATION GROMMETS (2)
505,331M
*P505331M*
®
Litho U.S.A.
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BUSHING (1)
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Table of Contents
Related Manuals for Lennox XP19
Summary of Contents for Lennox XP19
- Page 1 ......Lennox System Operation Monitor (LSOM) ..
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Page 2: Side View
XP19 PARTS ARRANGEMENT XP19 Heat Pumps3 WARNING The XP19 Heat Pumps, which will also be referred to in this This product and/or the indoor unit it is matched instruction as the outdoor unit, uses HFC−410A with may contain fiberglass wool. -
Page 3: Operating Service Valves
DRIER COIL MUFFLER HIGH PRESSURE PRESSURE INDOOR COIL LIQUID SERVICE PORT VAPOR GAUGE MANIFOLD SERVICE PORT LIQUID VAPOR LINE HFC−410 LINE VALVE A DRUM VALVE COMPRESSOR CHECK EXPANSION VALVE Figure 3. Typical Manifold Gauge Connection Setup Page 3 XP19 SERIES... -
Page 4: Recovering Refrigerant From Existing System
3. Replace the stem cap and tighten as follows: Without Torque Wrench: Finger tighten and use an appropriately sized wrench to turn an additional With Torque Wrench: Tighten finger tight and then 1/6 turn clockwise as illustrated in Figure 2. tighten per Table 1. -
Page 5: Removing Existing Outdoor Unit
48 in. (1219 mm) clearance required on top of unit. A clearance of 24 in. (610 mm) must be maintained 1. Start the existing HCFC−22 system in the cooling mode and close the liquid line valve. between two units. Page 5 XP19 SERIES... -
Page 6: Positioning Considerations
POSITIONING CONSIDERATIONS NOTE If necessary for stability, anchor unit to slab as described in Stabilizing Unit on Uneven Surfaces on page ELEVATING THE UNIT INSTALL UNIT AWAY FROM WINDOWS This unit is outfitted with elongated support feet as illustrated in Figure 11 which uses a similar method for elevating the unit. -
Page 7: Access Panel
Install the When panel is correctly positioned and aligned, insert the brackets as illustrated in Figure 15 using conventional screws and tighten. practices; replace the panels after installation is complete. Page 7 XP19 SERIES... -
Page 8: New Or Replacement Line Set
FOR EXTRA STABILITY corresponded to the size of cooling unit. If the XP19 is being used with either a new or existing ONE BRACKET PER SIDE (MIN.); FOR EXTRA STABILITY, 2 BRACKETS PER SIDE, 2" FROM EACH CORNER. indoor coil which is equipped with a liquid line which served as a metering device (RFCI), the liquid line must be Figure 15. -
Page 9: Brazing Connections
1. Cut ends of the refrigerant lines square (free from Figure 17. Refrigerant Line Set: Installing Vertical nicks or dents). Debur the ends. The pipe must remain Runs (New Construction Shown) round, do not pinch end of the line. Page 9 XP19 SERIES... -
Page 10: Replacement Parts
REMOVE CAP AND CORE FROM ATTACH CUT AND DEBUR BOTH LIQUID AND SUCTION GAUGES SERVICE PORTS SERVICE PORT MUST BE OPEN TO ALLOW EXIT SERVICE POINT FOR NITROGEN VALVE SUCTION LINE outdoor INDOOR UNIT UNIT LIQUID LINE SERVICE VALVE FLOW NITROGEN WRAP BRAZE LINE SET NITROGEN... -
Page 11: Flushing The System
Take care to empty all TYPICAL TXV REMOVAL PROCEDURE existing traps. Polyol ester (POE) oils are used in Lennox units charged with HFC−410A refrigerant. (Uncased Coil Shown) Residual mineral oil can act as an insulator, TWO PIECE... -
Page 12: Required Equipment
2. Install one of the provided Teflon rings around the Installing New Indoor Metering Device13 stubbed end of the CTXV and lightly lubricate the connector threads and expose surface of the Teflon ring with refrigerant oil. XP19 units use CTXV for metering refrigerant only. This section provides instructions installing CTXV 3. -
Page 13: Testing For Leaks
NOTE Insulating the sensing bulb once installed may be See the XP19 Engineering Handbook for approved CTXV required when the bulb location is external to the coil kit match−ups and application information. casing. -
Page 14: Evacuating The System
Evacuating the System15 WARNING Evacuating the system of non−condensables is critical for When using a high pressure gas such proper operation of the unit. Non−condensables are as dry nitrogen to pressurize a defined as any gas that will not condense under refrigeration conditioning temperatures and pressures present during operation of... - Page 15 Y2 OUT TERMINAL DEFROST BOARD DETAIL SHIPPED AS SHOWN ABOVE WITH TERMINAL CRIMPED TO BLUE WIRE; USE TERMINAL OR CUT OFF TERMINAL AND SPLICE BLUE WIRE WITH Y2 WIRE TO INDOOR UNIT. Figure 29. XP19 Wiring Page 15 XP19 SERIES...
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Page 16: Wiring Connections
LED codes. Table 14 describes LED operation when the 230VAC SUPPLY VOLTAGE module is incorrectly wired and the action required to The XP19 outdoor unit is rated for 230VAC applications correct the problem. only. A hard-start kit is required for applications where the supply voltage is less than 230VAC. - Page 17 All temperatures are Changing air flow affects all temperatures; recheck temperatures to BULB COIL confirm that the temperature drop and DT are within +3º. expressed in ºF Figure 30. Checking Indoor Airflow over Evaporator Coil using Delta−T Chart Page 17 XP19 SERIES...
- Page 18 WEIGH IN 1. Check Liquid and suction line pressures 2. Compare unit pressures with Table 8, Normal Operating Pressures. Refrigerant Charge per Line Set Length 3. Conduct leak check; evacuate previously outlined. 4. Weigh in the unit nameplate charge plus Ounces per 5 feet (g per 1.5 m) Liquid Line any charge required for line set differences...
- Page 19 ** Amount of charge required in additional to charge shown Table 8 XP19−036 (Continued) on unit nameplate. Remember to consider line set length Target Subcooling INDOOR HEAT Heating Cooling **Add difference. MATCH−UP PUMP (+5ºF) (+1ºF) charge CX34−48 SN# before SN#6007K Table 4 XP19−024...
- Page 20 197.3 317.2 481.6 some component in the system. 115.8 200.6 321.8 487.8 118.0 203.9 326.4 494.0 120.3 207.2 331.0 500.2 XP19−024 XP19−036 XP19−048 XP19−060 122.6 210.6 335.7 506.5 5F (5C)** 125.0 214.0 340.5 512.9 First Stage (Low Capacity) 127.3 217.4 345.3...
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Page 21: System Operations
Cycle the 24VAC power to LSOM off and on. After power necessary, order another of like design and capacity. up, existing code will display for 60 seconds and then clear. Lennox System Operation Monitor Manual reset can be achieve by any of the following (LSOM) (100034−1)20 methods: Disconnecting R wire from the LSOM’s R terminal. - Page 22 Table 11. LSOM Module LED Troubleshooting Codes Status LED Mis−wired Module Status LED Troubleshooting Information Condition Indication Determine/verify that both R and C module terminals are connected and voltage is Green LED ON Module not powering up. present at both terminals. Module powers up only when Determine if R and Y terminals are wired in reverse.
- Page 23 4 to 18 VDC . Every 15 minutes the solenoid voltage will be increase to 24 volts for a few seconds to ensure solenoid valve is engaged until Y2 signal is no longer present. Page 23 XP19 SERIES...
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Page 24: Defrost System
are added together for the total number of trips Defrost System21 counted by the DCB. DEFROST SYSTEM DESCRIPTION Up to four pressure switch trips are allowed in a single The defrost control board (DCB) measures differential thermostat demand without locking out the DCB. If the temperatures to detect when the system is performing thermostat demand satisfies before a fifth pressure poorly because of ice build−up on the outdoor coil. - Page 25 COIL SUPPORT AS SHOWN. SECURE WITH WIRE TIE. DETAIL A DISCHARGE LINE SENSOR COIL SENSOR − CLIP COIL TEMPERATURE SENSOR FROM THE DCB ON THE RETURN BEND SHOWN ON MODELS AS FOLLOWS: Figure 35. Sensor Locations Page 25 XP19 SERIES...
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Page 26: Delay Mode
Second−Stage Operation If the board receives a call DETAILED DEFROST SYSTEM OPERATION for second−stage compressor operation Y2 in heating or Defrost Cycles The demand defrost control board cooling mode and the first-stage compressor output is initiates a defrost cycle based on either frost detection or active, the second-stage compressor solenoid output will time. - Page 27 24VAC power to the Demand Defrost Control. The unit will remain in DEFROST The unit will return to HEAT MODE MODE until termination on time or un−calibrated with defrost timer set temperature. for 30 minutes. Figure 36. Test Mode Page 27 XP19 SERIES...
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Page 28: Diagnostic Leds
DEMAND DEFROST CONTROL BOARD Table 14. Demand Defrost Control A108 A10822 Inputs/Outputs and Jumper Settings Description NOTE Component locations may vary by board manufacturer. O OUT 24VAC output connection for reversing valve. LO−PS Connection for low−pressure switch TEST PINS 24VAC output for second−stage (gas heat) W−OUT furnace connection DEFROST... - Page 29 Inspect and clean the outdoor and indoor coils. The Check the condensate drain line for free and outdoor coil may be flushed with a water hose. unobstructed flow; clean, if necessary. Page 29 XP19 SERIES...
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Page 30: Tools Required
NOTE − If you are unsure about the filter required for measurements are critical to this test as indoor your system, call your Lennox dealer for assistance. system loading and outdoor ambient can affect variations between low and high capacity readings). - Page 31 Though your thermostat may vary somewhat from the OPTIONAL ACCESSORIES description below, its operation will be similar. Optional accessories for the XP19 include the following Temperature Setting Levers (see the XP19 Engineering Handbook for more details): Most heat pump thermostats have two temperature Timed-off control selector levers: one for heating and one for cooling.
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Page 32: Start−Up Checks
On the XP19 units, the Lennox System Operational Module controls the 2nd stage solenoid coil in compressor. Cooling Mode Operation − Block outdoor coil to maintain a minimum of 375 psig during testing.