Instruction/ maintenance manual of the product XC21 Lennox International Inc.
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Page 1 7/2012 506923−01 *2P72012* *P506923-01* E 2012 Lennox Industries Inc. Dallas, T exas, USA THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE W ARNING The S tate of California has determined that this product may contain or produce a chemical or chemicals, in very low doses, which may cause serious illness or death.
Page 2 UNIT DIMENSIONS − INCHES (MM) 39−1/2 (1003) 35−1/2 (902) 47 (1 194) 18−1/2 (470) 8 (203) 1 (25) 4−1/2 (1 14) LIQUID LINE INLET ELECTRICAL INLETS SIDE VIEW ACCESS VIEW DISCHARGE AIR 4.
Page 3 XC21 SERIES INST ALL UNIT AW A Y FROM WINDOWS TWO 90 _ ELBOWS INST ALLED IN LINE SET WILL REDUCE LINE SET VIBRA TION PLACEMENT FIGURE 2 Install unit level or , if on a slope, maintain slope tolerance of 2 degrees (or 2 inches per 5 feet [50 mm per 1.
Page 4 IMPORT ANT ! If this unit is being matched with an approved line set or indoor unit coil that was previously charged with mineral oil, or if it is being matched with a coil which was manufactured before January of 1999, th e coil and line set must be flushed prior to inst alla- tion.
Page 5 XC21 SERIES STEP 2 −− REFRIGERANT PIPING −− Removing Existing Indoor Metering Device SENSING LINE TEFLON ® RING FIXED ORIFICE BRASS NUT LIQUID LINE ASSEMBL Y (INCLUDES STRAINER) LIQUID LINE ORIFICE HOUSING DISTRIBUT OR TUBES DISTRIBUT OR ASSEMBL Y REMOVE AND DISCARD WHITE TEFLON ® SEAL (IF PRESENT) 1.
Page 6 STEP 2 −− REFRIGERANT PIPING −− Brazing Procedures A TTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND SUCTION / V APOR LINE SERVICE V AL VES OUTDOOR UNIT LIQUID LINE SUCTION / V APOR.
Page 7 XC21 SERIES CAUTION Brazing alloys and flux cont ain materials which are hazardous to your health. Avoid breathing vapors or fumes from brazing operations. Perform operations only in well−ventilated areas. Wear gloves and protective goggles or face shield to protect against burns.
Page 8 STEP 3 −− INST ALLING INDOOR EXP ANSION V AL VE This outdoor unit is designed for use in systems that include an exp ansion valve metering device. Se e the XC21 Product Specifications bulletin (EHB) for ap p r o v e d ex p a n s i o n va l v e kit ma t c h − u ps an d ap p l i c a t i o n in f o r m a t i o n .
Page 9 XC21 SERIES STEP 4 −− LEAK TEST AND EV ACUA TION TO V APOR SER VICE V AL VE HFC−410A MANIFOLD GAUGE SET OUTDOOR UNIT HIGH LOW CONNECT GAUGE SET A. Connect the high pressure hose of an HFC−410A manifold gauge set to the vapor valve service port.
Page 10 STEP 4 −− LEAK TEST AND EV ACUA TION (Continued) A. Open both manifold valves and start the vacuum pum p. 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 manifold gauge valve at least once.
Page 1 1 XC21 SERIES STEP 5 −− ELECTRICAL −− Circuit Sizing and Wire Routing In the U.S .A., wiring must conf orm wit h current local codes and the cur rent National Elec tric Code (NE C). In Canada, wiring m ust confor m with current local codes and t he current Canadian Elec trical Code (CEC) .
Page 12 NOTE For proper voltages, select control wires gauge per table below . WIRE RUN LENGTH A WG# INSULA TION TYPE LESS THAN 100’ (30 METERS) 18 TEMPERA TURE RA TING MORE THAN 100’ (30 METERS) 16 35ºC MINIMUM.
Page 13 XC21 SERIES STEP 5 −− ELECTRICAL (Continued) −− Out door Control (A175) Jumpers and T erminals 55 50 DEGREE TARGET 45 DEGREE TARGET 40 DEGREE TARGET (DEFAULT) 55 50 45 40 55 50 45 40 5.
Page 14 STEP 5 −− ELECTRICAL (Continued) −− Field Control Wiring Th e following two illustrations provide examples of control wiring connections when using a non−communicating thermostat.
Page 15 XC21 SERIES Y1 O R W1 G D R Y1 L C C B Y2 Y2 W O DS L T T W2 H H O C L Y2 DS DH G R Y1 W2 W1 1 2 4 5 Furnace ComfortSense [ 7000 Thermostats Catalog # Y0349 or Y2081 XC21 T wo − Stage Air Conditioner Control On − board link Low voltage thermostat wiring 3 1.
Page 16 Charging The XC21 unit is factory−charged with enough HFC−410A refrigerant to accommodate a 15−foot length of refrigerant piping. Charge should be checked and adjusted using the tables provided on the charging procedure sticker on the unit access panel.
Page 17 XC21 SERIES XC21 Field Operational Checklist Unit Readings Cooling*** Heating*** Y1 First S tage Expected results during Y2 demand (toggle switch ON) Y2 Second S tage Y1 First St age Expected .
Page 18 XC21 S tart−Up and Performance Checklist Customer Address Indoor Unit Model Serial Outdoor Unit Model Serial Solar Module Mfg and Model Serial Notes: ST ART−UP CHECKS Refrigerant T ype: Ra.
Page 19 XC21 SERIES Homeowner Information CAUTION Before attempting to perform any service or mainte- nance, turn the electrical power to unit OFF at discon- nect switch. Cleaning of th e out door unit’s coil should be performed by a licensed professional service technician (or equivalent).
An important point after buying a device Lennox International Inc. XC21 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Lennox International Inc. XC21 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Lennox International Inc. XC21 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Lennox International Inc. XC21 you will learn all the available features of the product, as well as information on its operation. The information that you get Lennox International Inc. XC21 will certainly help you make a decision on the purchase.
If you already are a holder of Lennox International Inc. XC21, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Lennox International Inc. XC21.
However, one of the most important roles played by the user manual is to help in solving problems with Lennox International Inc. XC21. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Lennox International Inc. XC21 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
