Lennox Merit Series Installation Instructions Manual
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Also See for Merit Series:
- Installation instructions manual (55 pages) ,
- Care and operation instructions manual (30 pages) ,
- User's information manual (11 pages)
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©2019 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional HVAC installer or
equivalent, or 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.
STEP 1 – SETTING THE UNIT – Clearances
See NOTES
See
NOTES
See NOTES
NOTES -
Service clearance of 30 in. (762 mm) must be maintained on one of
the sides adjacent to the control box.
Clearance to one of the other three sides must be 36 in. (914 mm).
See
Clearance to one of the remaining two sides may be 12 in. (305
NOTES
mm) and the final side may be 6 in. (152 mm).
A clearance of 24 in. must be maintained between two units.
CONTROL
48 in. (1219 mm) clearance required on top of unit.
BOX
Page 1
INSTALLATION
INSTRUCTIONS
Merit
Series 16HPX Units
®
HEAT PUMP
507876-01
8/2019
General
This 16HPX outdoor heat pump is designed for use with
HFC-410A refrigerant only. This unit must be installed with
an approved indoor air handler or coil. For AHRI Certified
system match-ups and expanded ratings, visit www.Len-
noxPros.com. These instructions are intended as a gen-
eral guide and do not supersede local codes in any way.
Consult authorities having jurisdiction before installation.
NOTICE!
Charging information is given on the charging
procedure sticker on the unit access panel. For
more in-depth information, consult the Installation
and Service Procedures manual on LennoxPros.
com or through the Technical Support department
at 800-453-6669.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
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Table of Contents
Related Manuals for Lennox Merit Series
Summary of Contents for Lennox Merit Series
- Page 1 INSTALLATION INSTRUCTIONS ©2019 Lennox Industries Inc. Merit Series 16HPX Units Dallas, Texas, USA ® HEAT PUMP 507876-01 8/2019 General This 16HPX outdoor heat pump is designed for use with HFC-410A refrigerant only. This unit must be installed with an approved indoor air handler or coil. For AHRI Certified system match-ups and expanded ratings, visit www.Len-...
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Page 2: Step 1 - Setting The Unit
IMPORTANT UNIT DIMENSIONS - INCHES (MM) Exhaust vents from dryers, water heaters and furnaces should be directed away from the outdoor unit. Prolonged exposure to exhaust gases and the chemicals contained within them may cause condensation to form on the steel cabinet and other metal components of the outdoor unit. -
Page 3: Step 2 - Refrigerant Piping
Polyol ester (POE) oils are used Refrigerant can be harmful if it is inhaled. Refrigerant in Lennox units charged with HFC-410A refrigerant. must be used and recovered responsibly. Residual mineral oil can act as an insulator, preventing Failure to follow this warning may result in personal proper heat transfer. - Page 4 STEP 2 – REFRIGERANT PIPING – Removing Existing Indoor Metering Device TYPICAL EXISTING FIXED ORIFICE TYPICAL EXISTING EXPANSION VALVE REMOVAL REMOVAL PROCEDURE PROCEDURE (UNCASED COIL SHOWN) (UNCASED COIL SHOWN) STUB END TWO-PIECE PATCH PLATE LIQUID LINE CHECK DISTRIBUTOR TUBES (UNCASED COIL ONLY) ORIFICE EXPANSION LIQUID LINE ORIFICE HOUSING...
- Page 5 STEP 2 – REFRIGERANT PIPING – Brazing Procedures 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 and debur the ends. The pipe must remain round. Do not crimp end both the vapor and liquid line service of the line.
- Page 6 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 vapor valve stem port.
- Page 7 STEP 3 – Install Indoor Expansion Valve This outdoor unit is designed for use in systems that include a check/expansion valve metering device. See the 16HPX Prod- uct Specifications bulletin (EHB) for approved check/expansion valve kit match-ups and application information. The check/ expansion valve unit can be installed internal or external to the indoor coil.
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Page 8: Step 4 - Leak Test And Evacuation
STEP 4 – LEAK TEST AND EVACUATION LEAK TEST HIGH MANIFOLD GAUGE SET OUTDOOR UNIT TO VAPOR SERVICE VALVE NOTE - Position canister to deliver liquid refrigerant. NITROGEN HFC-410A CONNECT GAUGE SET A - Connect the high pressure hose of an HFC-410A manifold gauge set to the vapor valve service port. NOTE - Normally, the high pressure hose is connected to the liquid line port. - Page 9 EVACUATION HIGH CONNECT GAUGE SET NOTE - Remove cores from service valves (if not already done). A - Connect low side of manifold gauge set with 1/4 SAE in-line tee to vapor line service valve B - Connect high side of manifold gauge set to OUTDOOR MANIFOLD liquid line service valve...
- Page 10 WARNING STEP 5 – ELECTRICAL – Circuit Sizing and Wire Routing Fire Hazard. Use of aluminum wire with this product may result in a fire, causing property damage, severe injury In the U.S.A., wiring must conform with current local codes and the current National Electric Code (NEC).
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Page 11: Low Voltage Connections
Install low voltage wiring from outdoor to indoor unit and from thermostat to indoor unit as illustrated. See figures 14 and 15 for typical field connections when connecting unit to either a CBX32MV or CBX40UHV in non-communicating mode. For connections to other Lennox air handlers or furnaces, see the ComfortSense®... - Page 12 Typical Field Wiring — Heat Pump Application with CBA38MV HEAT PUMP UNIT COMFORTSENSE CBA38MV (TWO-STAGE) 7500 X2658 OUTDOOR SENSOR IS REQUIRED FOR OUTDOOR TEMPERATURE DISPLAY, DEW POINT CONTROL, HEAT PUMP AND DUAL FUEL BALANCE POINTS. CONNECTED ON UNIT WITH LSOM. RESISTOR KIT (CAT # 47W97) IS REQUIRED WHEN CONNECTING THE COMFORTSENSE 7000 WITH THE LSOM 2.
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Page 13: System Configuration
UNIT COMPONENTS Charging Demand Defrost Control (A108) The 16HPX unit is factory-charged with enough HFC- The demand defrost control measures differential tem- 410A refrigerant to accommodate a 15-foot length of re- peratures to detect when the system is performing poorly frigerant piping. - Page 14 Service Light Output 24VAC service light output. 24VAC typically used to supply power to the Lennox System Operation 24 Volt output Monitor (LSOM). Not used in this system. Page 14...
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Page 15: Defrost System
NOTE – The demand defrost control accurately measures Defrost System the performance of the system as frost accumulates on the outdoor coil. This typically will translate into longer running This section addresses: time between defrost cycles as more frost accumulates on •... - Page 16 DEMAND DEFROST CONTROL (A108) DIAGNOSTIC LEDS The state (Off, On, Flashing) of two LEDs on the demand defrost control (DS1 [Red] and DS2 [Green]) indicate diagnostics conditions that are described in table 3. TABLE 3 DEMAND DEFROST CONTROL (A108) DIAGNOSTIC LEDS DS1 and DS2 System Status, Fault and Lockout Codes Condition/Code Possible Cause(s)
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Page 17: Start Up Checks
Start-Up and Performance Checklist Customer Address Indoor Unit Model Serial Outdoor Unit Model Serial Notes: START UP CHECKS Refrigerant Type: Rated Load Amps: Actual Amps Rated Volts Actual Volts Condenser Fan Full Load Amps Actual Amps: COOLING MODE Suction Pressure: Liquid Pressure: Supply Air Temperature: Ambient Temperature:... -
Page 18: Homeowners Information
If you are unsure about fore each cooling and heating season by a licensed pro- the filter required for your system, call your Lennox dealer fessional HVAC service technician (or equivalent). for assistance.