Table of Contents
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Service Literature
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, service agency, or the gas supplier.
The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992.
IMPORTANT
This unit must be matched with an indoor coil as
specified in Lennox Product Specification bulletin. Coils
previously charged with HCFC-22 must be flushed.
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.
WARNING
Electric Shock Hazard. Can cause injury or
death. Unit must be properly 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.
UNIT INFORMATION
16HPX (HFC- 410A) SERIES OUTDOOR UNITS
Corp. 1912-L8
August 9, 2019
Table of Contents
Installation Clearances ...................................................2
Model Number Identification ...........................................2
Dimensions .....................................................................3
Specifications .................................................................4
Typical Unit Parts Arrangement ......................................5
Operating Gauge Set and Service Valves ......................5
Unit Placement ..............................................................7
Removing and Installing Louvered Panels .....................8
New or Replacement Line Set ........................................9
Brazing Connections ................................................... 11
Flushing Line Set and Indoor Coil ................................14
Installing Indoor Metering Device .................................15
Leak Test Line Set and Indoor Coil ..............................16
Evacuating Line Set and Indoor Coil ...........................17
Electrical .......................................................................18
System Operation .......................................................20
System Configuration ...................................................20
Defrost System ...........................................................23
Maintenance ...............................................................25
Servicing Units Void of Charge ...................................31
Start-Up ......................................................................31
General Information
These instructions are intended as a general guide and do
not supersede national or local codes in any way. Consult
authorities having jurisdiction before installation.
The Merit® 16HPX 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
16HPX Product Specification bulletin (EHB) for approved
indoor component matchups.
This outdoor unit is designed for use in systems that use
the following refrigerant metering device:
• Check thermal expansion valve (CTXV)
Page 1
16HPX
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Table of Contents
Related Manuals for Lennox 16HPX Series
Summary of Contents for Lennox 16HPX Series
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Page 1: Table Of Contents
410A refrigerant only. This unit must be installed with specified in Lennox Product Specification bulletin. Coils an approved indoor air handler or coil. See the Lennox previously charged with HCFC-22 must be flushed. 16HPX Product Specification bulletin (EHB) for approved CAUTION indoor component matchups. -
Page 2: Installation Clearances
Installation Clearances 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) Clearance to one of the remaining two sides may be NOTES NOTES A clearance of 24 in. -
Page 3: Dimensions
Dimensions 4-3/8 4-3/8 (111) (111) INLET 4-3/8 4-3/8 (111 111) OPTIONAL UNIT INLET INLET STAND-OFF KIT (4) COMPRESSOR (Field Installed) COIL DRAIN OUTLETS (Around perimeter of base) 6-3/8 SUCTION LINE 4-3/8 (162) CONNECTION (111) LIQUID LINE INLET 6-3/8 4-3/8 CONNECTION (162) (111) TOP VIEW... -
Page 4: Specifications
Specifications General Model No. 16HPX-024 16HPX-036 16HPX-048 16HPX-060 Data Nominal Tonnage Sound Rating Number (dB) Connections Liquid line (o.d.) - in. (sweat) Vapor line (o.d.) - in. 1-1/8 ² Refrigerant R-410A charge furnished 7 lbs. 14 oz. 10 lbs. 8 oz. 9 lbs. -
Page 5: Typical Unit Parts Arrangement
Gauge hoses must be rated for use at up to 800 psig recess. of pressure with a 4000 psig burst rating. See the Lennox Service and Application Notes #C-08-1 for further details and information. OPERATING SERVICE VALVES The liquid and vapor line service valves are used for re-... - Page 6 SERVICE VALVES ANGLE AND BALL Operating Angle Type Service Valve: 1. Remove stem cap with an appropriately sized wrench. 2. Use a service wrench with a hex-head extension (3/16” for liquid line valve sizes and 5/16” for vapor line valve sizes) to back the stem out counterclockwise as far as it will go.
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Page 7: Unit Placement
DETAIL B DETAIL A INSTALL UNIT LEVEL OR, IF ON A SLOPE, MAINTAIN SLOPE TOLERANCE INSTALL UNIT AWAY OF 2 DEGREES (OR 2 INCHES PER 5 FEET [50 MM PER 1.5 M]) AWAY FROM WINDOWS FROM BUILDING STRUCTURE. DISCHARGE AIR BUILDING STRUCTURE MOUNTING... -
Page 8: Warning
Removing and Installing Louvered Panels 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: Important
Field refrigerant piping consists of liquid and suction lines LINE SET ISOLATION from the outdoor unit (braze connections) to the indoor unit coil (flare or braze connections). Use Lennox L15 CAUTION (braze, non-flare) series line set, or use field-fabricated refrigerant lines as listed in table 2. - Page 10 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 —...
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Page 11: Brazing Connections
IMPORTANT Brazing Connections Use the procedures outlined in figures 5 and 6 for brazing Allow braze joint to cool before removing the wet rag line set connections to service valves. from the service valve. Temperatures above 250ºF can damage valve seals. WARNING IMPORTANT Danger of fire. - 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 and debur the ends. The pipe must remain round. Do not crimp end both the suction / vapor and liquid line of the line.
- 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.
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Page 14: Flushing Line Set And Indoor Coil
Flushing Line Set and Indoor Coil TYPICAL EXISTING FIXED ORIFICE TYPICAL EXISTING EXPANSION VALVE REMOVAL REMOVAL PROCEDURE (UNCASED PROCEDURE (UNCASED COIL SHOWN) COIL SHOWN) STUB END TWO PIECE PATCH PLATE LIQUID LINE CHECK DISTRIBUTOR TUBES (UNCASED COIL ONLY) ORIFICE EXPANSION LIQUID LINE ORIFICE HOUSING HOUSING VALVE... -
Page 15: Installing Indoor Metering Device
See the Lennox 16HPX Product Specification bulletin for expansion valve. Refer to below illustration for reference approved expansion valve kit match-ups. The expansion during installation of expansion valve unit. -
Page 16: Leak Test Line Set And Indoor Coil
Take care to WARNING empty all existing traps. Polyol ester (POE) oils are used in Lennox units charged with HFC-410A refrigerant. Refrigerant can be harmful if it is inhaled. Refrigerant Residual mineral oil can act as an insulator, preventing must be used and recovered responsibly. -
Page 17: Evacuating Line Set And Indoor Coil
Evacuating Line Set and Indoor Coil CONNECT GAUGE SET HIGH NOTE — Remove cores from service valves (if not already done). Connect low side of manifold gauge set with 1/4 SAE in-line tee to vapor line service valve Connect high side of manifold gauge set to liquid line service valve OUTDOOR MANIFOLD... -
Page 18: Electrical
IMPORTANT Electrical 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 cur- capable of accurately measuring down to 50 microns. - Page 19 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 20: System Operation
Defrost Thermostat (S6) System Operation The defrost thermostat is located on the liquid line be- UNIT COMPONENTS tween the check/expansion valve and the distributor. When defrost thermostat senses 42°F (5.5°C) or cooler, IMPORTANT the thermostat contacts close and send a signal to the defrost control to start the defrost timing. - Page 21 TEST PINS (P1) LOW AMBIENT THERMOSTAT PINS (P3) DEFROST TERMINATION PIN SETTINGS (P1) SENSOR CONNECTION (COIL AND AMBIENT SENSORS) (P4) DIAGNOSTIC LEDS (DS1 AND DS2) DELAY PINS (P5) 24V TERMINAL STRIP REVERSING VALVE CONNECTIONS (O OUT) (P2) Demand Defrost PRESSURE Control (A108) SWITCH CIRCUIT CONNECTIONS...
- Page 22 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 22...
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Page 23: 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 24 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 4. TABLE 4 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 25: Maintenance
Indoor Unit access panel. Unit may have multiple power 1. Clean or change filters. supplies. 2. Lennox blower motors are prelubricated and perma- WARNING nently sealed. No more lubrication is needed. 3. Adjust blower speed for cooling. Measure the pressure Improper installation, adjustment, alteration, service drop over the coil to determine the correct blower CFM. - Page 26 • During the defrost cycle, you may notice steam rising 1 - Air Filter – Ask your Lennox dealer to show you from the outdoor unit. This is a normal occurrence. The where your indoor unit's filter is located.
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Page 27: Wiring And Sequence Of Operation
Wiring and Sequence of Operation FIGURE 15. Typical Unit Wiring (-024, -036 and -048 Units) Page 27... - Page 28 FIGURE 16. Typical Unit Wiring (-060 Units) Page 28...
- Page 29 FIGURE 17. Typical Factory Wiring (-024, -036 and -048 Units) Page 29...
- Page 30 FIGURE 18. Typical Factory Wiring (-060 Units) Page 30...
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Page 31: Servicing Units Void Of Charge
16HPX OPERATING SEQUENCE Servicing Units Void of Charge This is the sequence of operation for 16HPX series units. If the outdoor unit is void of refrigerant, clean the system The sequence is outlined by numbered steps which cor- using the procedure described below. - Page 32 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 S.P.