INSTALLATION INSTRUCTIONS HS25 SERIES UNITS - Lennox

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A--Line Voltage To facilitate conduit, knockouts are provided in cabinet panel. Route conduit through knockout in cabinet and connect to side of control panel. Refer to figure 3 for thermostat, furnace and condensing unit wire connections and figure 4 for field wiring diagram. Note--Units are approved for use with copper conductors only. B--24V, Class II Circuit 24V, Class II Circuit connections are made up below control box. Note--A complete unit wiring diagram is located inside the unit access panel. HS25 and FURNACE (GAS OR ELECTRIC) THERMOSTAT CONNECTIONS (Some connections may not apply. Refer to specific thermostat and furnace.) Furnace Thermostat HS25 R W1 W2 Y G C POWER 1ST STAGE AUX. HEAT 2ND STAGE AUX. HEAT W2 INDOOR BLOWER COMMON R W1 Y G C COMPRESSOR COMMON Condensing Unit HS25 COMPRESSOR HS25 COMMON FIGURE 3 HS25 CONDENSING UNIT FIELD WIRING DIAGRAM CONDENSING UNIT ROOM THERMOSTAT TYPICAL INDOOR UNIT C Y1 G W RC RH TB1 TRANSFORMER R W1 G TO HEATING CONTROLS TO COOLING SPEED 24v T1 YELLOW BLACK OR BLUE NOTE--SEE UNIT WIRING DIAGRAM FOR POWER SUPPLY CONNECTIONS. TO 24V CLASS II POWER SOURCE -- 20 VA MINIMUM W2 W3 C 24V, CLASS II JUNCTION BOX TO HEATING SPEED POWER YELLOW GROUND PER NATIONAL AND LOCAL CODES K3 INDOOR BLOWER RELAY NOTE--IF INDOOR UNIT IS NOT EQUIPPED WITH BLOWER RELAY, IT MUST BE FIELD PROVIDED AND INSTALLED (P--8--3251 OR EQUIVALENT) 24V, CLASS II VOLTAGE INSTALLED AT FACTORY 24V, CLASS II VOLTAGE FIELD INSTALLED FIGURE 4 3DJH
PLUMBING Field refrigerant piping consists of liquid and suction lines from the condensing unit (sweat connections) to the indoor evaporator coil. Use Lennox L10 (flare) or L15 (sweat) series line sets as shown in table 1 or use field-- fabricated refrigerant lines. Refer to the piping section of the Lennox Unit Information Service Manual for proper size, type and application of field--fabricated lines. Sweat Connection Procedure 1-- End of refrigerant line must be cut square, kept round, free from nicks or dents and deburred (I.D. and O.D.) 2-- Wrap a wet cloth around the valve body and copper tube stub; braze the line set tubing to the valve. 3-- Quench joint with water or a wet cloth to prevent possible heat damage to the valve core and opening port. IMPORTANT--Tube end must stay bottomed in the fitting during final assembly to ensure proper seating, sealing and rigidity. 4-- Install filter drier, provided with unit, in the liquid line as close as possible to the expansion device. If refrigerant tubes are routed through a wall, seal and isolate the opening so vibration is not transmitted to the building. NOTE-Line length should be no greater than 50 feet (15.2 m). Select line set diameters from table 1 to ensure oil return to compressor. +6 81,7 /,48,' /,1( LQ PP LQ PP LQ PP LQ PP 7$%/( 5()5,*(5$17 /,1( .,76 68&7,21 /,1( LQ PP LQ PP LQ PP LQ PP / /,1( 6(76 / IW IW PP / IW IW PP / IW IW PP ),(/' )$%5,&$7(' / /,1( 6(76 / IW IW PP / IW IW PP / IW IW PP ),(/' )$%5,&$7(' REFRIGERATION Service Valves and Gauge Manifold Attachment The liquid line and suction line service valves and gauge ports are accessible on inside of unit. These gauge ports are used for leak testing, evacuating, charging and checking charge. IMPORTANT--Services valves are closed to line set connections. Do not open until refrigerant lines and indoor coil have been leak tested and evacuated. All precautions should be exercised to keep the system free from dirt, moisture and air. /($. 7(67,1* After the line set has been connected to the indoor and outdoor units, the line set connections and indoor unit must be checked for leaks. WARNING Never use oxygen to pressurize refrigeration or air conditioning system. Oxygen will explode on contact with oil and could cause personal injury. When using high pressure gas such as nitrogen or CO 2 for this purpose, be sure to use a regulator that can control the pressure down to 1 or 2 psig (6.9 to 13.8 kPa). Using an Electronic Leak Detector or Halide 1-- Connect a cylinder of nitrogen with a pressure regulating valve to the center port of the manifold gauge set. 2-- Connect the high pressure hose of the manifold gauge set to the service port of the suction valve. (Normally, the high pressure hose is connected to the liquid line port, however, connecting it to the suction port better protects the manifold gauge set from high pressure damage.) 3-- With both manifold valves closed, open the valve on the R22 bottle (vapor only). 4-- Open the high pressure side of the manifold to allow R22 into the line set and indoor unit. Weigh in a trace amount of R22. [A trace amount is a maximum of 2 ounces (57g) refrigerant or 3 pounds (31 kPa) pressure]. Close the valve on the R22 bottle and the valve on the high pressure side of the manifold gauge set. Disconnect R22 bottle. 5-- Adjust nitrogen pressure to 150 psig (1034 kPa). Open the valve on the high side of the manifold gauge set which will pressurize line set and indoor unit. 6-- After a short period of time, open a refrigerant port to make sure the refrigerant added is adequate to be detected. (Amounts of refrigerant will vary with line lengths.) Check all joints for leaks. Purge nitrogen and R22 mixture. Correct any leaks and recheck. (9$&8$7,1* Evacuating the system of non--condensables is critical for proper operation of the unit. Non--condensables are defined as any gas that will not condense under temperatures and pressures present during operation of an air conditioning system. Non--condensables and water vapor combine with refrigerant to produce substances that corrode copper piping and compressor parts. 1-- Connect manifold gauge set to the service valve ports as follows: low pressure gauge to suction line service valve; high pressure gauge to liquid line service valve. 3DJH
Page 1 and 2: PRODUCT LITERATURE ¤1995 Lennox In
Page 3: HS25 PARTS ARRANGEMENT CONDENSER FA
Page 7 and 8: NOTE--Compressor noise level will b
Page 9: 3-- Visually inspect connecting lin

INSTALLATION INSTRUCTIONS HS25 SERIES UNITS - Lennox

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