Lennox CONDENSING UNITS - Manuals

Lennox CONDENSING UNITS – Manual in PDF format online.

Manuals:

Manual

Manual Lennox CONDENSING UNITS

Summary

Page 3 - Typical Unit Parts Arrangement; Figure 1. Typical Unit Parts Arrangement; Model Number Identification; − Tons

Page 3 14ACX SERIES Typical Unit Parts Arrangement COMPRESSOR HARNESS CONNECTION LIQUID LINE SERVICE VALVE SUCTION LINE SERVICE VALVE OUTDOOR COIL DISCHARGE LINE HIGH PRESSURE SWITCH (S4) COMPRESS0R (B1) GROUND LUG CONTACTOR (K1) CONTROL DUAL RUNCAPACITOR(C12) CONTROL WIRELOOP CUTOUT FOR HIGH VOLTAG...

Page 4 - CAUTION; TORQUE REQUIREMENTS; IMPORTANT; Table 1. Torque Requirements; Parts; USING MANIFOLD GAUGE SET

Page 4 506645−01 CAUTION Physical contact with metal edges and corners whileapplying excessive force or rapid motion can result inpersonal injury. Be aware of, and use caution whenworking near these areas during installation or whileservicing this equipment. Operating Manifold Gauge Set andService V...

Page 5 - Operating Angle Type Service Valve:; Figure 2. Angle and Ball Service Valves

Page 5 14ACX SERIES (VALVE STEM SHOWNCLOSED) INSERT HEXWRENCH HERE SERVICE PORT CORE SERVICE PORT CAP ANGLE−TYPE SERVICE VALVE (FRONT−SEATED CLOSED) SERVICE PORT CORE TO OUTDOOR UNIT STEM CAP (VALVE STEM SHOWN OPEN)INSERT HEX WRENCH HERE TO INDOOR UNIT ANGLE−TYPE SERVICE VALVE (BACK−SEATED OPENED) B...

Page 6 - Recovering Refrigerant from Existing System; DISCONNECT POWER; RECOVERING REFRIGERANT; Figure 3. Refrigerant Recovery Procedure

Page 6 506645−01 Recovering Refrigerant from Existing System Use the following procedure to recover refrigerant from an existing system (indoor coil, line set and outdoor unit). SERVICE DISCONNECT SWITCH MAIN FUSE BOX/BREAKER PANEL Disconnect all power to the existing outdoor unit at the servicedisc...

Page 7 - New Unit Placement; See; Consider the following when positioning the unit:

Page 7 14ACX SERIES 6 (152) 36 (914) 12 (305) 30 (762) LINE SETCONNECTIONS 24 (610) LINE SET CONNECTIONS ACCESS PANEL 48 (1219) MINIMUM CLEARANCE BETWEEN TWO UNITS CLEARANCE ON ALL SIDES INCHES (MILLIMETERS) ACCESS PANEL MINIMUM CLEARANCE ABOVE UNIT NOTES: Clearance to one of the other threesides mu...

Page 8 - NOTICE; Removing and Installing Louvers; WARNING; REMOVAL

Page 8 506645−01 PLACING UNIT ON SLAB When installing unit at grade level, the top of the slabshould be high enough above grade so that water fromhigher ground will not collect around the unit. The slabshould have a slope tolerance as described in figure 5,detail B. ROOF MOUNTING Install the unit at...

Page 9 - New or Replacement Line Set; Brazing; Mineral oils are not compatible with HFC−410A

Page 9 14ACX SERIES New or Replacement Line Set This section provides information on new installation orreplacement of existing line set. If a new or replacementline set is not required, then proceed to Brazing Connections on page 11. Field refrigerant piping consists of liquid and suction linesfrom...

Page 10 - LINE SET

Page 10 506645−01 ANCHORED HEAVY NYLON WIRE TIE OR AUTOMOTIVE MUFFLER-TYPE HANGER STRAP LIQUID LINE TOVAPOR LINE WALL STUD LIQUID LINE NON−CORROSIVE METAL SLEEVE VAPOR LINE − WRAPPEDIN ARMAFLEX AUTOMOTIVE MUFFLER-TYPE HANGER REFRIGERANT LINE SET TRANSITION FROM VERTICAL TO HORIZONTAL Line Set Isolat...

Page 11 - Brazing Connections

Page 11 14ACX SERIES Brazing Connections Use the procedures outline in figures 9 and 10 for brazingline set connections to service valves. IMPORTANT Polyol ester (POE) oils used with HFC−410Arefrigerant absorb moisture very quickly. It is veryimportant that the refrigerant system be kept closedas mu...

Page 12 - CUT AND DEBUR

Page 12 506645−01 ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND SUCTION / VAPOR LINE SERVICEVALVES OUTDOOR UNIT LIQUID LINE VAPOR LINE LIQUID LINE SERVICE VALVE SUCTION / VAPOR LINE SERVICE VALVE ATTACH GAUGES INDOOR UNIT SUCTION / VAPOR SERVICE PORT MUST BE OPEN TO ALLOW EXIT POINT FOR NITRO...

Page 13 - BRAZE LINE SET; Allow braze joint to cool. Apply; WRAP SERVICE VALVES

Page 13 14ACX SERIES WHEN BRAZING LINE SET TO SERVICE VALVES, POINT FLAME AWAY FROM SERVICE VALVE. LIQUID LINE SERVICE VALVE LIQUID LINE BRAZE LINE SET Wrap both service valves with water saturated cloths as illustrated here and as mentioned in step 4, before brazing to line set. Watersaturated clot...

Page 14 - Flushing Line Set and Indoor Coil; Installing Indoor Metering; OR; FLUSHING LINE SET; Figure 11. Removing Metering Device and Flushing

Page 14 506645−01 Flushing Line Set and Indoor Coil Flushing is only required if existing indoor coil and line set are to be used. Otherwise proceed to Installing Indoor Metering Device on page 15. SENSING LINE TEFLON ® RING FIXED ORIFICE BRASS NUT LIQUID LINE ASSEMBLY (INCLUDES STRAINER) LIQUID LIN...

Page 15 - Installing Indoor Metering Device; See the

Page 15 14ACX SERIES Installing Indoor Metering Device This outdoor unit is designed for use in systems that useeither an fixed orifice (RFC) (included with outdoor unit), orexpansion valve metering device (purchased separately)at the indoor coil. See the Lennox 14ACX Engineering Handbook for approv...

Page 16 - Leak Test Line Set and Indoor Coil; Evacuating Line Set; CONNECT GAUGE SET

Page 16 506645−01 IMPORTANT The Environmental Protection Agency (EPA) prohibitsthe intentional venting of HFC refrigerants duringmaintenance, service, repair and disposal of appliance.Approved methods of recovery, recycling or reclaimingmust be followed. IMPORTANT If this unit is being matched with ...

Page 17 - Evacuating Line Set and Indoor Coil; Figure 14. Evacuating System

Page 17 14ACX SERIES Evacuating Line Set and Indoor Coil A Open both manifold valves and start the vacuum pump. B Evacuate the line set and indoor unit to an absolute pressure of 23,000 microns (29.01 inches of mercury). NOTE During the early stages of evacuation, it is desirable to close the manifo...

Page 18 - Electrical; 4VAC TRANSFORMER; INSTALL THERMOSTAT

Page 18 506645−01 WARNING Danger of Equipment Damage. Avoid deep vacuumoperation. Do not use compressors to evacuate asystem. Extremely low vacuums can cause internalarcing and compressor failure. Damage caused bydeep vacuum operation will void warranty. CAUTION Brazing alloys and flux contain mater...

Page 19 - ROUTING HIGH VOLTAGE/ GROUND AND CONTROL WIRING; HIGH VOLTAGE / GROUND WIRES; SINGLE PHASE

Page 19 14ACX SERIES Any excess high voltage field wiring should be trimmed andsecured away from any low voltage field wiring. To facilitate aconduit, a cutout is located in the bottom of the control panel.Connect conduit to the control panel using a proper conduit fitting. ROUTING HIGH VOLTAGE/ GRO...

Page 20 - Figure 16. Typical Factory Wiring Diagram (Copeland Compressor)

Page 20 506645−01 HIGH PRESSURE SWITCH(S4) LIQUID LINE CRANKCASE THERMOSTAT (S40) CRANKCASE HEATER (HR1) Figure 16. Typical Factory Wiring Diagram (Copeland Compressor)

Page 21 - Figure 17. Typical Factory Wiring Diagram (Interlink Compressor)

Page 21 14ACX SERIES CRANKCASE HEATER (HR1) HIGH PRESSURE SWITCH(S4) LIQUID LINE CRANKCASE THERMOSTAT (S40) THERMAL PROTECTION SWITCH (S5 OR S173) Figure 17. Typical Factory Wiring Diagram (Interlink Compressor)

Page 22 - Servicing Units Delivered Void of Charge; Start−Up and Charging Procedures.; Unit Start−Up; Operating Service; System Refrigerant; CONNECTIONS FOR TESTING AND CHARGING; GAUGE SET; Figure 18. Manifold Gauge Set Setup and Connections

Page 22 506645−01 Servicing Units Delivered Void of Charge If the outdoor unit is void of refrigerant, clean the systemusing the procedure described below. 1. Leak check system using procedure outlined in this instruction. 2. Evacuate the system using procedure outlined in this instruction. 3. Use n...

Page 23 - Determine the desired; oF; TXV; START: Determine how refrigerant is metered

Page 23 14ACX SERIES CHECKING AIR FLOW AT INDOOR COIL Check airflow using the Delta−T ( D T) process using the illustration in figure 19. 1. Determine the desired D T Measure entering air temper- ature using dry bulb ( A ) and wet bulb ( B ). D T is the intersect- ing value of A and B in the table (...

Page 24 - CALCULATING SYSTEM CHARGE FOR OUTDOOR UNIT VOID OF CHARGE; Below; ABOVE or

Page 24 506645−01 Liquid Line Set Diameter Ounces per 5 feet (g per 1.5 m) adjust from 15 feet (4.6 m) line set* 3/8" (9.5 mm) 3 ounce per 5’ (85 g per 1.5 m) *If line length is greater than 15 ft. (4.6 m), add this amount. Ifline length is less than 15 ft. (4.6 m), subtract this amount. Refrige...

Page 25 - Figure 23. HFC−410A Subcooling TXV Charge

Page 25 14ACX SERIES 1. Confirm proper airflow across coil using figure 19. 2. Compare unit pressures with table 4, Normal Operating Pressures . USE WEIGH-IN METHOD Weigh-in or remove refrigerantbased upon line length SCº (Subcooling) Values (F:+/−1.0° [C: +/−0.6°]) BLOCK OUTDOOR COIL: [sometimes ne...

Page 26 - START: Measure outdoor ambient temperature; SUPERHEAT RFC; Figure 24. HFC−410A Superheat RFC Method

Page 26 506645−01 START: Measure outdoor ambient temperature NOTE − Do not attempt to charge system where adash appears, system could be overcharged.Superheat is taken at suction line service port.Suction line superheat must never be less than 5ºFat the suction line service port. USE WEIGH-IN METHOD...

Page 28 - System Operation; Maintenance

Page 28 506645−01 System Operation UNIT COMPONENTS IMPORTANT Some scroll compressor have internal vacuum protectorthat will unload scrolls when suction pressure goesbelow 20 psig. A hissing sound will be heard when thecompressor is running unloaded. Protector will resetwhen low pressure in system is...

Page 29 - HOMEOWNER

Page 29 14ACX SERIES Indoor Unit 1. Clean or change filters. 2. Lennox blower motors are prelubricated and permanently sealed. No more lubrication is needed. 3. Adjust blower speed for cooling. Measure the pressure drop over the coil to determine the correct blower CFM.Refer to the unit information ...

Page 30 - Start−Up and Performance Checklist; Thermostat

Page 30 506645−01 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 Filte...