Lennox Merit 13HPX Series Installation Instructions Manual
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Lennox Merit 13HPX Series Installation Instructions Manual

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E2011 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
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 6.
BRAZING LINE SET TO SERVICE VALVES
It is imperative to follow the brazing technique illustrated starting on page
11 to avoid damaging the service valve's internal seals.
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.
Improper installation, adjustment, alteration, 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.
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 may be
levied for noncompliance.
This unit must be matched with an indoor coil as
specified in Lennox Engineering Handbook. Coils
previously charged with HCFC−22 must be flushed.
06/11
*2P0611*
Downloaded from
ManualsNet.com
These instructions are intended as a
general guide and do not supersede
local codes in any way. Consult
authorities having jurisdiction before
installation.
CAUTION
WARNING
IMPORTANT
IMPORTANT
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INSTALLATION
INSTRUCTIONS
®
Merit
Series 13HPX Units
HEAT PUMP UNITS
506727−01
06/11
Supersedes 04/11

TABLE OF CONTENTS

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Servicing and Weighing In Refrigerant for Units
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Shipping and Packing List

Check the unit components for shipping damage. If you
find any damage, immediately contact the last carrier.
1
Assembled outdoor unit

General

The 13HPX outdoor unit uses HFC−410A refrigerant. This
unit must be installed with a matching indoor blower coil
and line set as outlined in the 13HPX Engineering
Handbook. These outdoor units are designed for use in
check / expansion valve (CTXV) systems only and are not
to be used with other refrigerant flow control devices. An
indoor coil check / expansion valve approved for use with
HFC−410A must be ordered separately and installed prior
to operating the unit.
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Summary of Contents for Lennox Merit 13HPX Series

  • Page 1: Table Of Contents

    This unit must be matched with an indoor coil as indoor coil check / expansion valve approved for use with specified in Lennox Engineering Handbook. Coils HFC−410A must be ordered separately and installed prior previously charged with HCFC−22 must be flushed.

  • Page 2: Model Number Identification

    Model Number Identification HP X − − − Nominal SEER Minor Revision Number Voltage 230 = 208/230V −1 phase − 60hz Unit Type HP = Heat Pump Cooling Capacity − Tons Refrigerant 018 = 1.5 X = R−410A 024 = 2 030 = 2.5 036 = 3 042 = 3.5...

  • Page 3: Typical Parts Arrangement

    Compressor bolts 90 in.− lb. 10 NM recess. Gauge port seal cap 8 ft.− lb. 11 NM See the Lennox Service and Application Notes #C−08−1 for further details and information. Page 3 13HPX SERIES Downloaded from ManualsNet.com search engine...
  • Page 4 Operating Gauge Set and Service Valves USING MANIFOLD GAUGE SET IMPORTANT When checking the system charge, only use a manifold gauge set that features low−loss anti−blow back fittings. To prevent stripping of the various caps used, the appropriately sized wrench should be used and fitted Manifold gauge set used for HFC−410A refrigerant snugly over the cap before tightening.

  • Page 5: Recovering Refrigerant From Existing System

    Recovering Refrigerant from Existing System CONNECT MANIFOLD GAUGE SET DISCONNECT POWER Connect a manifold gauge set, clean recovery cylinder and a Disconnect all power to the existing outdoor unit at the disconnect recovery machine to the service ports of the existing unit.. switch and/or main fuse box/breaker panel.

  • Page 6: New Outdoor Unit Placement

    New Outdoor Unit Placement transmission. For proper placement of unit in relation CAUTION to a window see the provided illustration in figure 5, detail A. In order to avoid injury, take proper precaution when lifting heavy objects. PLACING UNIT ON SLAB When installing unit at grade level, the top of the slab Remove existing outdoor unit prior to placement of new should be high enough above grade so that water from...
  • Page 7 INSTALL UNIT AWAY DETAIL B DETAIL A FROM WINDOWS These units operate under a wide range of weather conditions; therefore, several factors must be considered when positioning the outdoor unit. The unit must be positioned to give adequate clearances for sufficient airflow and servicing. Install unit level or, if on a slope, maintain slope tolerance of 2 degrees (or 2 inches per 5 feet [50 mm per 1.5 m]) away from building structure.

  • Page 8: Removing And Installing Panels

    Removing and Installing Louvers WARNING To prevent personal injury, or damage to panels, unit or structure, be sure to observe the following: While installing or servicing this unit, carefully stow all removed panels out of the way, so that the panels will not cause injury to personnel, nor cause damage to objects or structures nearby, nor will the panels be subjected to damage (e.g., being bent or scratched).

  • Page 9: Line Set Requirements

    Field refrigerant piping consists of both liquid and vapor outlined under Flushing Line Set and Indoor Coil on page lines from the outdoor unit to the indoor coil. Use Lennox L15 (sweat, non−flare) series line set, or field−fabricated refrigerant line sizes as specified in table 2.
  • Page 10 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 11: Brazing Connections

    Brazing Connections Use the procedures outline in figures 8 and 9 for brazing line set connections to service valves. IMPORTANT IMPORTANT Polyol ester (POE) oils used with HFC−410A Allow braze joint to cool before removing the wet rag refrigerant absorb moisture very quickly. It is very from the service valve.
  • Page 12 CAP AND CORE REMOVAL CUT AND DEBUR Cut ends of the refrigerant lines square (free from nicks or dents) Remove service cap and core from both the suction / vapor and and debur the ends. The pipe must remain round. Do not crimp end liquid line service ports.
  • Page 13 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 Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and out of the suction / vapor valve stem port.

  • Page 14: Indoor Refrigerant Metering Device Removal And Flushing Line Set And Indoor Coil

    Indoor Refrigerant Metering Device Removal and Flushing Line Set and Indoor Coil Flushing is only required when the existing system used HCFC−22 refrigerant. If the existing system used HFC−410a, then remove the original indoor coil metering device and proceed to Installing New Indoor Metering Device on page . TYPICAL EXISTING FIXED ORIFICE TYPICAL EXISTING EXPANSION VALVE REMOVAL REMOVAL PROCEDURE (UNCASED...

  • Page 15: Installing New Indoor Metering Device

    See the Lennox 13HPX Engineering Handbook for approved check / expansion valve kit match−ups. The check / expansion valve device can be installed either internal or external to the indoor coil. In applications where an uncased coil is being installed in a field−provided plenum, install the check / expansion valve in a manner that will provide access for field servicing...

  • Page 16: Leak Test Line Set And Indoor Coil

    Leak Test Line Set and Indoor Coil IMPORTANT Leak detector must be capable of sensing HFC refrigerant. CONNECT GAUGE SET Connect an HFC−410A manifold gauge set high pressure hose to the HIGH vapor valve service port. NOTE Normally, the high pressure hose is connected to the liquid MANIFOLD GAUGE SET line port.

  • Page 17: Evacuating Line Set And Indoor Coil

    Evacuating Line Set and Indoor Coil Evacuating the system of non−condensables is critical for proper operation of the unit. Non−condensables are defined as any gas that will not condense under temperatures and pressures present during operation of an air conditioning system. Non−condensables and water suction combine with refrigerant to produce substances that corrode copper piping and compressor parts.

  • Page 18: Electrical Connections

    Electrical Connections IMPORTANT In the U.S.A., wiring must conform with current local codes Use a thermocouple or thermistor electronic vacuum and the current National Electric Code (NEC). In Canada, gauge that is calibrated in microns. Use an instrument wiring must conform with current local codes and the current capable of accurately measuring down to 50 microns.
  • Page 19 ROUTING HIGH VOLTAGE/ GROUND AND CONTROL WIRING HIGH VOLTAGE / GROUND WIRES Any excess high voltage field wiring should be trimmed and secured away from any low voltage field wiring. To facilitate a conduit, a cutout is located in the bottom of the control panel. Connect conduit to the control panel using a proper conduit fitting. TYPICAL CONTROL WIRING CONTROL WIRING Install low voltage wiring from outdoor to indoor unit and from...
  • Page 20 Figure 15. Typical Unit Wiring Diagram Page 20 506727−01 Downloaded from ManualsNet.com search engine...
  • Page 21 HIGH PRESSURE SWITCH (S4) LIQUID LINE LOW PRESSURE SWITCH (S87) SUCTION LINE REVERSING VALVE (L1) DEFROST THERMOSTAT (S6) CRANKCASE THERMOSTAT (S40) − −042, 048, AND −060 UNITS ONLY Figure 16. Typical Unit Factory Wiring Page 21 13HPX SERIES Downloaded from ManualsNet.com search engine...
  • Page 22 THERMAL SWITCH (S173) HIGH PRESSURE SWITCH (S4) LIQUID LINE LOW PRESSURE SWITCH (S87) SUCTION LINE GROUND WIRE REVERSING VALVE (L1) (GREEN) CRANKCASE HEATER (HR1) (−060 ONLY) DEFROST THERMOSTAT (S6) CRANKCASE THERMOSTAT (S40) − −042, 048, AND −060 UNITS ONLY Figure 17. Typical Unit Factory Wiring Compressor with Thermal Protection Switch (S173) Page 22 506727−01...

  • Page 23: Unit Start−Up

    Unit Start−Up Service and Weigh In Refrigerant for Outdoor Units Delivered Void of Charge IMPORTANT The following procedures are only required if it has been If unit is equipped with a crankcase heater, it should be determine that the new outdoor unit is void of charge. Skip to the next section if refrigerant charge is present.
  • Page 24 MANIFOLD GAUGE SET GAUGE SET CONNECTIONS FOR OPTIMIZING SYSTEM CHARGE HIGH NOTE Refrigerant tank should be turned right−side−up to deliver vapor during charge optimizing procedure. TRUE SUCTION PORT CONNECTION HFC−410A REFRIGERANT TANK CHARGE IN LIQUID PHASE TEMPERATURE SENSOR DIGITAL SCALE (LIQUID LINE) TO LIQUID LINE SERVICE VALVE...

  • Page 25: Optimizing System Refrigerant Charge

    DISTRIBUTOR OUTDOOR UNIT NOTE − ARROWS INDICATE DIRECTION OF REFRIGERANT FLOW REVERSING VALVE CHECK / EXPANSION VALVE OUTDOOR COIL INDOOR UNIT BI−FLOW FILTER / DRIER MUFFLER TRUE SUCTION VAPOR PORT SERVICE PORT LIQUID LINE COMPRESSOR SERVICE PORT CHECK / EXPANSION VALVE INDOOR NOTE −...
  • Page 26 1. Determine the desired DT Measure entering air temper- Temp. 24 24 24 23 23 22 22 22 20 19 18 17 16 15 ature using dry bulb (A) and wet bulb (B). DT is the intersect- of air entering 23 23 23 22 22 21 21 20 19 18 17 16 15 14 ing value of A and B in the table (see triangle).
  • Page 27 APPROVED MATCHED SYSTEM COMPONENTS, TARGETED SUBCOOLING (SC) VALUES AND ADD CHARGE VALUES Listed below are the approved matched system Subcooling values listed in the following tables are based components (air handlers and indoor coils), targeted on outdoor ambient air temperature of: subcooling and add charge values for the 13HPX.
  • Page 28 Liquid Line Pressures Model Heating Mode Cooling Mode Number ºF (ºC)* (−7) (−1) (4.5) (10) (16) (18) (21) (24) (27) (29) (32) (35) (38) (41) (43) (45) 13HPX−018 13HPX−024 13HPX−030 13HPX−036 13HPX−042 13HPX−048 13HPX−060 *Temperature of the air entering the outside coil. Table 5.

  • Page 29: System Operation

    Thermal Protection Switch (S173) Compressor System Operation Mounted Some XC13 units are equipped with a compressor UNIT COMPONENTS mounted normally closed temperature switch that prevents compressor damage due to overheating caused IMPORTANT by internal friction. The switch is located on top of the compressor casing (see figure 1).

  • Page 30: Maintenance (Dealer And Homeowner)

    Indoor Unit Service Light Connection 1. Clean or change filters. The defrost control includes terminal connections for a 2. Lennox blower motors prelubricated service light which provides a signal that activates the permanently sealed.
  • Page 31 Heat Pump Operation personal injury. Be aware of, and use caution when Your new Lennox heat pump has several characteristics working near these areas during installation or while that you should be aware of: servicing this equipment.

  • Page 32: Start−Up And Performance Checklist

    For update−to−date information, see any of the following Check for any blown fuses or tripped circuit breakers. publications: Verify unit access panels are in place. Lennox 13HPX Engineering Handbook Verify air filter is clean. Lennox Product Catalog If service is needed, locate and write down the unit Lennox Price Book Start−Up and Performance Checklist...

This manual is also suitable for:

Merit 13hpx-018-230Merit 13hpx-024-230Merit 13hpx-030-230Merit 13hpx-036-230Merit 13hpx-042-230Merit 13hpx-048-230 ... Show all

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