Lennox Merit Series 13ACX Installation Instructions Manual
  1. Manuals
  2. Brands
  3. Lennox Manuals
  4. Air Conditioner
  5. 13ACX
  6. Installation instructions manual

Lennox Merit Series 13ACX Installation Instructions Manual

Merit series
Hide thumbs Also See for Merit Series 13ACX:
Table of Contents

Advertisement

Quick Links

See also: Instruction and Installation Manual
Enlarged version
E2008 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
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.
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.
09/08
*2P0908*
adjustment,
alteration,
may
be
levied
for
INSTALLATION
INSTRUCTIONS
®
Merit
Series 13ACX Units
AIR CONDITIONER
506081−01
09/08
Supersedes 07/08

Table of Contents

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Shipping and Packing List

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
Refrigerant flow control kit (Fixed Orifice)
1
Liquid line filter drier

13ACX Air Conditioners

13ACX Air Conditioners, which will also be referred to in
this instruction as the outdoor unit, uses HFC−410A
refrigerant. This outdoor unit must be installed with a
matching indoor unit and line set as outlined in the Lennox
13ACX Engineering Handbook.
This outdoor unit is designed for use in systems that use
one of the following refrigerant metering devices:
S
Thermal expansion valve (TXV)
S
Fixed orifice
Page 1
. . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . .
506081−01
*P506081-01*
Litho U.S.A.
1
1
2
2
. . . . . . .
4
5
5
6
8
9
10
. . . . . . . . .
11
13
13
14
14
15
21
22
22
23
24

Advertisement

Table of Contents
loading

Related Manuals for Lennox Merit Series 13ACX

Summary of Contents for Lennox Merit Series 13ACX

  • Page 1: Table Of Contents

    HFC−410A refrigerant. This outdoor unit must be installed with a matching indoor unit and line set as outlined in the Lennox IMPORTANT 13ACX Engineering Handbook. This outdoor unit is designed for use in systems that use...

  • Page 2: Unit Dimensions

    Only use Allen wrenches of sufficient hardness (50Rc − Rockwell Harness Scale minimum). Fully Lennox Industries Inc. insert the wrench into the valve stem recess. P.O. Box 799900 Dallas, TX 75379−9900 Service valve stems are factory−torqued (from 9...
  • Page 3 OUTDOOR UNIT (Uncased Coil Shown) TXV OR FIXED OUTDOOR ORIFICE COIL HIGH PRESSURE PRESSURE LIQUID LINE SUCTION LINE GAUGE MANIFOLD SERVICE VALVE SERVICE VALVE HFC−410A COMPRESSOR DRUM FILTER DRIER Figure 1. Typical Manifold Gauge Connection Setup Each service valve is equipped with a service port which To Open and Close Angle−Type Service Valve: has a factory−installed valve stem.

  • Page 4: Recovering Refrigerant From Existing System

    To Open and Close Ball−Type Service Valve: SERVICE PORT CAP A valve stem cap protects the valve stem from contamination and assures a leak−free seal. SERVICE PORT SERVICE PORT CORE 1. Remove stem cap with an appropriately sized wrench. (VALVE STEM SHOWN OPEN) 2.

  • Page 5: Removing Existing Outdoor Unit

    METHOD 2: Positioning New Outdoor Unit Use this method if the existing outdoor unit is equipped See Unit Dimensions on page 2 for sizing mounting slab, with manual shut−off valves, and plan on using new platforms or supports. Refer to figure 7 for mandatory HCFC−22 refrigerant to flush the system.

  • Page 6: New Or Replacement Line Set

    REFRIGERANT LINE SET Field refrigerant line set consists of liquid and suction lines from the outdoor unit to the indoor unit coil. Use Lennox TWO 90° ELBOWS INSTALLED L15 (braze, non−flare) series line set, or field−fabricated IN LINE SET WILL REDUCE LINE SET VIBRATION.
  • Page 7 MUST NOT CONTACT WALL. void the warranty. A replacement filter drier is available LIQUID LINE OUTSIDE WALL SUCTION LINE from Lennox. See Brazing Connections on page 8 for WOOD BLOCK special procedures on brazing filter drier connections to BETWEEN STUDS the liquid line.

  • Page 8: Brazing Connections

    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 9: Removing Indoor Unit Metering Device

    NOTE − The fixed orifice or TXV metering device at the TYPICAL FIXED ORIFICE REMOVAL PROCEDURE indoor unit will allow low pressure nitrogen to flow through DISTRIBUTOR TUBES the system.) LIQUID LINE ORIFICE HOUSING NOTE − Use silver alloy brazing rods with five or six percent TEFLON RING REMOVE AND DISCARD VALVE STEM ASSEMBLY...

  • Page 10: Flushing The System

    Polyol ester (POE) oils are used in HCFC−22 gauge set to the liquid line valve, Lennox units charged with HFC−410A refrigerant. Recovery machine with an empty recovery tank to Residual mineral oil can act as an insulator, the gauge set.

  • Page 11: Installing New Indoor Unit Metering Device

    5. Close the valve on the inverted drum and the gauge set valves. Pump the remaining refrigerant out of the recovery machine and turn the machine off. 6. Use dry nitrogen to break the vacuum on the TXV (1) refrigerant lines and indoor unit coil before removing HEX HEAD BOLTS the recovery machine, gauges and refrigerant drum.
  • Page 12 NOTE − Insulating the sensing bulb once installed may be TWO PIECE (Uncased Coil Shown) PATCH PLATE required when the bulb location is external to the coil (UNCASED COIL ONLY) casing. LIQUID LINE STUB END ORIFICE HOUSING ON LINES SMALLER THAN 7/8", DISTRIBUTOR SUCTION LINE MOUNT...

  • Page 13: Testing For Leaks

    6. After a few minutes, open one of the service valve Testing for Leaks ports and verify that the refrigerant added to the system earlier is measurable with a leak detector. After the line set has been connected to both the indoor NOTE −...

  • Page 14: Servicing Unit Delivered Void Of Charge

    manifold gauge center port hose from vacuum pump. Attach the manifold center port hose to a dry nitrogen HIGH VOLTAGE FIELD WIRING cylinder with pressure regulator set to 150 psig (1034 kPa) and purge the hose. Open the manifold gauge LOW VOLTAGE WIRE TIES FIELD WIRING...

  • Page 15: Start−Up And Charging Procedures

    Figure 27. Typical 13ACX Unit Wiring Diagram NOTE − See unit wiring diagram for power supply connections. If indoor unit is not equipped with blower THERMOSTAT INDOOR UNIT relay. It must be field−provided and installed (P−8−3251 or POWER equivalent) OUTDOOR UNIT HEAT Start−Up and Charging Procedures...
  • Page 16 5. Check voltage supply at the disconnect switch. The SETTING UP TO CHECK CHARGE voltage must be within the range listed on the unit’s 1. Close manifold gauge set valves. Connect the center nameplate. If not, do not start the equipment until you manifold hose to an upright cylinder of HFC−410A.
  • Page 17 1. Check Liquid and suction line pressures START: Measure outdoor ambient temperature 2. Compare unit pressures with Table 4, 64ºF and Normal Operating Pressures. BELOW 3. Conduct leak check; evacuate USE EITHER APPROACH previously outlined. ABOVE or OR SUBCOOLING 4. Weigh in the unit nameplate charge plus BELOW 65ºF METHOD...
  • Page 18 1. Confirm proper airflow across coil using figure 65ºF START: Measure outdoor ambient temperature 2. Compare unit pressures with Table 4, Normal Operating Pressures. ABOVE 3. Set thermostat to call for heat (must have a USE WEIGH-IN METHOD DO NOT CHARGE UNIT cooling load between 70-80ºF (21−26ºC) ABOVE or 4.
  • Page 19 1. Confirm proper airflow across coil using figure 29. 40ºF START: Measure outdoor ambient temperature 2. Compare unit pressures with Table 4, Normal Operating Pressures. ABOVE 3. Use SUPERHEAT to correctly charge unit or to USE WEIGH-IN METHOD verify the charge is correct. Weigh-in or remove refrigerant ABOVE or 4.
  • Page 20 Table 4. HFC−410A 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 IMPORTANT differences in installations. Significant deviations could mean that the system is not properly charged or that a problem exists with some component in the system.

  • Page 21: System Operation

    Table 5. HFC−410A Temperature (°F) − Pressure (Psig) °F Psig °F Psig °F Psig °F Psig °F Psig °F Psig °F Psig °F Psig 100.8 137.1 178.5 231.6 290.8 365.0 545.6 445.9 102.9 139.6 181.6 235.3 295.1 370.0 451.8 552.3 105.0 142.2 184.3...

  • Page 22: Maintenance

    5. Check all wiring for loose connections. Maintenance 6. Check for correct voltage at unit. (blower operating) WARNING 7. Check amperage draw on blower motor. UNIT NAMEPLATE: _________ ACTUAL: __________ Electric shock hazard. Can cause injury or death. Before attempting to Homeowner Information perform any service or maintenance, turn the electrical power to unit OFF at...

  • Page 23: Optional Accessories

    Optional Accessories calling for service: Make sure all electrical disconnect switches are ON. Refer to the Lennox 13ACX Engineering Handbook for the Make sure the room thermostat temperature selector latest available accessories for this unit. Below is a list of AND the system switch are properly set.

  • Page 24: Start−Up And Performance Checklist

    Start−Up and Performance Checklist Job Name Job no. Date Job Location City State Installer City State Unit Model No. Serial No. Service Technician Nameplate Voltage Rated Load Ampacity Compressor Outdoor Fan Maximum Fuse or Circuit Breaker Electrical Connections Tight? - Indoor Filter clean? - Supply Voltage (Unit Off) Indoor Blower RPM...

This manual is also suitable for:

13acx-01813acx-02413acx-03013acx-03613acx-04213acx-048 ... Show all

Table of Contents