Lennox Merit Series 14HPX Installation Instructions Manual
Merit series units
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- Installation instructions manual (36 pages) ,
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E2009 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
WARNING
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.
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 may be
levied for 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.
WARNING
Electric Shock Hazard. Can cause injury
or death. Unit must be grounded in
accordance with national and local
codes.
Line voltage is present at all components
when unit is not in operation on units with
single-pole contactors. Disconnect all
remote electric power supplies before
opening access panel. Unit may have
multiple power supplies.
11/09
*2P1109*
INSTALLATION
INSTRUCTIONS
®
Merit
Series 14HPX Units
HEAT PUMP UNITS
506377−01
11/09
Supersedes 505,243M
TABLE OF CONTENTS
Shipping and Packing List
General
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Unit Dimensions
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Typical Unit Parts Arrangement
Model Number Identification
General Information
Operating Gauge Set and Service Valves
Recovering Refrigerant from Existing System
New Outdoor Unit Placement
New or Replacement Line Set
Metering Devices and Flushing the System
Testing for Leaks
Evacuating the System
Electrical Connections
Servicing Unit Delivered Void of Charge
Start−Up
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System Refrigerant
Removing and Installing Louvers
System Operation
Defrost System
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Maintenance
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Start−Up and Performance Checklist
Shipping and Packing List
Check the unit components for shipping damage. If you
find any damage, immediately contact the last carrier.
1 − Assembled 14HPX outdoor unit
General
The Merit
®
14HPX model 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
14HPX Engineering Handbook for approved indoor
component matchups.
IMPORTANT
This model is designed for use in expansion valve
systems only. An indoor expansion valve approved for
use with
HFC−410A
separately, and installed prior to operating the system.
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refrigerant must be ordered
506377−01
*P506377-01*
Litho U.S.A.
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Table of Contents
Related Manuals for Lennox Merit Series 14HPX
Summary of Contents for Lennox Merit Series 14HPX
- Page 1 INSTALLATION INSTRUCTIONS E2009 Lennox Industries Inc. Dallas, Texas, USA ® Merit Series 14HPX Units HEAT PUMP UNITS 506377−01 Litho U.S.A. 11/09 Supersedes 505,243M TABLE OF CONTENTS Shipping and Packing List ......
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Page 2: Typical Unit Parts Arrangement
Unit Dimensions − inches (mm) DISCHARGE AIR OUTDOOR COIL FAN COMPRESSOR SUCTION AND LIQUID LINE CONNECTION OPTIONAL UNIT STANDOFF KIT (4) (FIELD INSTALLED) SIDE VIEW SIDE VIEW Model No. 14HPX−018 24−1/4 (616) 29−1/4 (743) 28−1/2 (724) 14HPX−024 24−1/4 (616) 29−1/4 (743) 28−1/2 (724) 14HPX−030 24−1/4 (616) -
Page 3: Model Number Identification
IMPORTANT Lennox Industries Inc. P.O. Box 799900 To prevent stripping of the various caps used, the Dallas, TX 75379−9900 appropriately sized wrench should be used and fitted snugly over the cap before tightening. -
Page 4: Service Valves
OPERATING SERVICE VALVES Each valve is equipped with a service port which has a factory−installed valve stem. Figure 1 provides information The liquid and vapor line service valves are used for on how to access and operating both angle and ball service removing refrigerant, flushing, leak testing, evacuating, valves. -
Page 5: Recovering Refrigerant From Existing System
Recovering Refrigerant from Existing System RECOVERING REFRIGERANT FROM SYSTEM DISCONNECT POWER CONNECT MANIFOLD GAUGE SET Disconnect all power to the existing outdoor unit at the service Connect a gauge set, clean recovery cylinder and a recovery disconnect switch or main fuse box/breaker panel. machine to the service ports of the existing unit. -
Page 6: New Outdoor Unit Placement
New Outdoor Unit Placement INSTALL UNIT AWAY See Unit Dimensions on Page 2 for sizing mounting slab, FROM WINDOWS platforms or supports. Refer to Figure 2 for mandatory installation clearance requirements. TWO 90_ ELBOWS INSTALLED IN LINE SET WILL REDUCE LINE SET VIBRATION Figure 3. -
Page 7: New Or Replacement Line Set
MATCHING WITH NEW OR EXISTING INDOOR COIL New or Replacement Line Set AND LINE SET This section provides information on new installation or The RFC1−metering line consisted of a small bore copper replacement of existing line set. If a new or replacement line that ran from condenser to evaporator coil. - Page 8 LINE SET IMPORTANT Refrigerant lines must not contact structure. INSTALLATION REFRIGERANT LINE SET INSTALLING Line Set Isolation The following illustrations are VERTICAL RUNS (NEW CONSTRUCTION SHOWN) examples of proper refrigerant line set isolation: NOTE Insulate liquid line when it is routed through areas where the surrounding ambient temperature could become higher than the REFRIGERANT LINE SET TRANSITION...
- Page 9 BRAZING NOTE − Use silver alloy brazing rods with five or six percent minimum silver alloy for copper−to−copper brazing, 45 percent alloy for copper−to−brass and copper−to−steel brazing. CONNECTIONS CAP AND CORE REMOVAL Remove service cap and core CUT AND DEBUR from both the vapor and liquid line service ports.
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Page 10: Metering Devices And Flushing The System
Metering Devices and Flushing the System TYPICAL CHECK EXPANSION VALVE FLUSHING REMOVAL AND REPLACEMENT PROCEDURE (Uncased Coil Shown) LINE SET AND INDOOR COIL (1 OF 2) STUB END TWO PIECE PATCH PLATE LIQUID LINE CHECK (UNCASED COIL ONLY) ORIFICE EXPANSION TYPICAL FIXED ORIFICE REMOVAL HOUSING VALVE... -
Page 11: Leak Test
Leak Testing the System LEAK TEST LINE SET AND INDOOR COIL NOTE Normally, the high pressure hose is connected to the liquid line port. How- ever, connecting it to the vapor port better protects the manifold gauge set from high pressure damage. -
Page 12: Evacuating The System
Evacuating the System EVACUATING MANIFOLD GAUGE SET LINE SET AND INDOOR COIL CONNECT GAUGE HIGH NOTE Remove cores from service valves (if not al- ready done). Connect low side of manifold gauge set with 1/4 SAE in−line tee to vapor line service valve A34000 1/4 SAE TEE WITH Connect high side of manifold gauge... - Page 13 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.
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Page 14: Typical Control Wiring
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 15 Figure 7. Typical Field Wiring Diagram Page 15 14HPX SERIES...
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Page 16: System Refrigerant
GAUGE SET MANIFOLD GAUGE SET CONNECTIONS FOR TESTING AND CHARGING HIGH TRUE SUCTION PORT CONNECTION OUTDOOR UNIT REFRIGERANT TANK CHARGE IN LIQUID PHASE DIGITAL SCALE TEMPERATURE SENSOR (LIQUID LINE) LIQUID LINE TO LIQUID SERVICE LINE SERVICE PORT VALVE TEMPERATURE SENSOR Close manifold gauge set valves and connect the center hose to a cylinder of HFC−410A. - Page 17 ADDING OR REMOVING REFRIGERANT This system uses HFC−410A refrigerant which operates at much higher pressures than . 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 . This unit is NOT approved for use with coils which use capillary tubes or fixed orifices as a refrigerant metering device.
- Page 18 WEIGH IN SUBCOOLING method for adding initial refrigerant charge, and then use method for verifying refrigerant charge. CALCULATING SYSTEM CHARGE FOR WEIGH IN OUTDOOR UNIT VOID OF CHARGE If the system is void of refrigerant, first, locate and repair any leaks and then weigh in the refrigerant charge into the unit.
- Page 19 Table 3. 14HPX−018 Target *Add Subcooling charge Target INDOOR MATCHUPS *Add Heat Heat Cool Cool Subcooling charge (+5ºF) (+1ºF) INDOOR MATCHUPS Heat Heat Cool Cool 14HPX−036 (Continued) (+5ºF) (+1ºF) CR33−50/60C CBX27UH−018/024 CR33−48B/C CBX32MV−018/024 CX34−49C CBX40UHV−024 CX34−43B/C, −50/60C Table 4. 14HPX−024 CX34−38A/B S/N# 6007 and after Target *Add...
- Page 20 Table 10. Normal Operating Pressures − Liquid +10 and Vapor +5 PSIG* IMPORTANT Use table 10 as a general guide when performing maintenance checks. This is not a procedure for charging the unit (Refer to Charging / Checking Charge section). Minor variations in these pressures may be expected due to differences in instal- lations.
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Page 21: Removing And Installing Louvers
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 22: System Operation
System Operation TEST PINS DEFROST AMBIENT TERMINATION THERMOSTAT The outdoor unit and indoor blower cycle on demand from PIN SETTINGS PINS the room thermostat. If the thermostat blower switch is in SENSOR PLUG IN the ON position, the indoor blower operates continuously. (COIL &... - Page 23 AMBIENT SENSOR Figure 13. Sensor Locations DEFROST SYSTEM SENSORS Table 12. Sensor Temp. / Resistance Range Sensors connect to the defrost board through a Temperature Resistance values Pins/Wire Range °F (°C) range (ohms) Color field-replaceable harness assembly that plugs into the Sensor board.
- Page 24 out of the temperature range of the sensor, the board will Calibration Mode The board is considered uncalibrated not perform demand or time/temperature defrost when power is applied to the board, after cool mode operation and will display the appropriate fault code. operation, or if the coil temperature exceeds the Heating and cooling operation will be allowed in this fault termination temperature when it is in heat mode.
- Page 25 TEST Placing the jumper on the field test pins allows the technician to: Clear short cycle lockout Clear five−strike fault lockout Cycle the unit in and out of defrost mode Place the unit in defrost mode to clear the coil When Y1 is energized and 24V power is being applied to the Control, a test cycle can be initiated by placing a jumper on the Control’s TEST pins for 2 to 5 seconds.
- Page 26 DEFROST BOARD DIAGNOSTICS See table 13 to determine defrost board operational conditions and to diagnose cause and solution to problems. Table 13. Defrost Control Board Diagnostic LEDs Green Condition/Code Possible Cause(s) Solution Power problem No power (24V) to board terminals R Check control transformer power (24V).
- Page 27 Outdoor Unit HOMEOWNER 1. Clean and inspect outdoor coil (may be flushed with a Cleaning of the outdoor unit’s coil should be performed by water hose). Ensure power is off before cleaning. a trained service technician. Contact your dealer and set up a schedule (preferably twice a year, but at least once a 2.
- Page 28 NOTE The filter and all access panels must be in place the unit will return to normal operation at the any time the unit is in operation. conclusion of the defrost cycle. 4. Electronic Air Cleaner Some systems are Extended Power Outage equipped with an electronic air cleaner, designed to The heat pump is equipped with a compressor crankcase remove airborne particles from the air passing through...