LENNOX Air Conditioner/heat Pump(outside Unit) Manual L0806495
User Manual: LENNOX LENNOX Air conditioner/heat pump(outside unit) Manual LENNOX Air conditioner/heat pump(outside unit) Owner's Manual, LENNOX Air conditioner/heat pump(outside unit) installation guides
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LENNOX ';_2002 Lennox Industries inc. Dallas, Texas INSTALLATION INSTRUCTIONS HPXA12 SERIES UNITS HEAT PUMP UNITS 504,777M 05/04 Supersedes 02/04 HPXA12 Elite® outdoor units use R410A, which is an ozone friendly HFC refrigerant, This unit must be installed with a matching indoor blower coil and line set as outlined in the Lennox Engineering Handbook. HPXA12 outdoor units are designed for use in expansion valve systems only. They are not designed to be used with other refrigerant flow control devices, An expansion valve approved for use with R410A must be ordered separately and must be installed prior to operating the unit, _ Technical IlI_.LU_Publications Lithe U.S.A. HPXA12 Outdoor Unit ........................... Shipping & Packing List ......................... General Information ............................. Unit Dimensions ................................ Setting the Unit ................................. Electrical ...................................... Refrigerant Piping .............................. Flushing Existing Line Set & Indoor Coil ........... Refrigerant Metering Device ..................... Manifold Gauge Set ............................. Service Valves ................................. Leak Testing ................................... Evacuation ................................... Start-Up ...................................... Charging .................................... System Operation ............................. Defrost System ............................... Maintenance .................................. Optional Accessories .......................... Homeowner Information ........................ HPXA12 Check List ............................ 1 1 1 2 3 4 5 6 7 8 8 9 10 11 11 14 15 18 18 18 20 RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE ,&IMPORTANT These instructions are intended as a general guide and do not supersede local codes in any way, Consult authorities having jurisdiction before installation. 1 - Assembled HPXA12 outdoor unit WARNING Check the unit components for shipping damage. If you find any damage, immediately contact the last carrier, ,&IMPORTANT ,&WARNING 05/04 IIIHIIIIIIIIIIIIIflll, lll,llllllf 504,777M IIIHIIIIIIII, III, III,III, III,IIIIIIIIIIIII INLET_N 7 AIR Model No. INLET HPXA12-018 HPXA12-024 HPXA12-030 INLET © © AIR AIR in. HPXA12-036 HPXA12-042 mm HPXA12-048 in. HPXA12-060 mm A B C 24-1/4 33-1/4 32-1/2 616 845 826 28-1/4 37-1/4 36-1/2 718 946 927 VAPOR LINE CONNECTION INLET'_ LIQUID LINE CONNECTION AIR Top View A h..J OUTDOOR II COIL FAN COMPRESSOR_ C B VAPOR & LIQUID LINE CONNECTION _" ELECTRICAL INLETS 2-3/4 (70) Side View 3/7 4, (19) OPTIONAL UNIT STAND-OFF KIT (Field Page 2 Installed) '_ Side View 4 - When installed in areas where low ambient temperatures exist, locate unit so winter prevailing winds do not blow directly into outdoor coil. &CAUTION 5 - Locate unit away from overhanging roof lines which would allow water or ice to drop on, or in front of, coil or into unit. Slab Mounting-Figure &CAUTION Outdoor units operate under a wide range of weather conditions; therefore, several factors must be considered when positioning the outdoor unit. Unit must be positioned to give adequate clearances for sufficient airflow and servicing. A minimum clearance of 24 inches (610 mm) between multiple units must be maintained. Refer to figure 1 for installation clearances. 2 When installing the unit at grade level, the top of the slab should be high enough above the grade so that water from higher ground will not collect around the unit. See figure 2. The slab should have a slope tolerance away from the building of 2 degrees or 2 inches per 5 feet (51 mm per 1524 mm). This will prevent ice build-up under the unit during a defrost cycle. Refer to roof mounting section for barrier construction if the unit must face prevailing winter winds. Slab Mounting At Ground STRUCTURE DISCHARGE Level AIR 0 Installation Clearances GROUNDLEVEL MOUNTING SLAB MUST SLOPE AWAY FROM BUILDING. Figure 2 *NO TE - A service clearance of 30" (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" (914 mm). Clearance to one of the remaining two sides may be 12" (305 Roof Mounting-Figure Install unit a minimum of 6 inches (152 mm) above the roof surface to avoid ice build-up around the unit. Locate the unit above a load bearing wall or area of the roof that can adequately support the unit, Consult local codes for rooftop applications. mm) and the final side may be 6" (152 mm). NOTE - A clearance of 24" (610 mm) must be maintained between two units. NOTE - 48" (1219 mm) clearance required on top of unit. Maximum soffit overhang is 36" (914 mm). Figure 3 1 Rooftop Application Wind Barrier Construction 1 - Place a sound-absorbing material, such as Isomode, under the unit if it will be installed in a location or position that will transmit sound or vibration to the living area or adjacent buildings. 2 - Mount unit high enough above ground or roof to allow adequate drainage of defrost water and prevent ice build-up. 3 - In heavy snow areas, do not locate unit where drifting will occur. The unit base should be elevated above the depth of average snows. PREVAILING I WINTER WINDS _65°F (18°C) The following procedure is intended as a general guide and is for use on expansion valve systems only. For best results, indoor temperature should be 70°F (21°C) to 80°F (26°C). Monitor system pressures while charging. 1 - Record outdoor ambient temperature thermometer. using a digital 2 - Attach high pressure gauge set and operate unit for several minutes to allow system pressures to stabilize. 3 - Comparestabilizedpressures withthoseprovidedin table7, "NormalOperatingPressures."Minorvariationsinthesepressures maybeexpected duetodifferencesin installations, Significantdifferencescould meanthatthesystemisnotproperlychargedorthata problemexistswithsomecomponent in the system. Pressureshigherthanthoselistedindicatethatthe systemis overcharged. Pressureslowerthanthose listedindicatethatthesystemis undercharged. Verify adjustedchargeusingtheapproachmethod. ApproachMethod 4 - Usethesamedigitalthermometer usedtocheckoutdoorambienttemperature tocheckliquidlinetemperature.Verifytheunitchargeusingtheapproach method. Thedifference between theambientandliquidtemperaturesshouldmatchvaluesgivenintable6.Addrefrigeranttolowertheapproach temperature andremoveit toincreasetheapproach temperature, Lossofcharge resultsinlowcapacityandefficiency. 5 - If thevaluesdonotagreewiththethoseintable6,add refrigerantto lowerthe approachtemperature or recoverrefrigerant fromthesystemto increasetheapproachtemperature. Table 6 Approach Model Number Values for Charging Approach Temperature Liquid Line Temp. - Outdoor Ambient °F (°C) HPXA12-18 5 (2.8) HPXA12-24 8.0 (4.4) HPXA12-30 12.5 (6.9) HPXA12-36 13 (7.2) HPXA12-42 13 (7.2) HPXA12-48 8.5 (4.7) HPXA12-60 12 (6.7) A IMPORTANT Table 7 Normal Operating Pressures (Liquid +10 and Vapor +5 psig) Cooling Outdoor Coil HPXA12-18 HPXA12-24 Operation HPXA12-30 HPXA12-36 HPXA12-42 HPXA12-48 HPXA12-60 Entering Air Temp. °F (°C) Liquid Vapor Liquid vapor Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor 65 (18.3) 223 147 254 130 244 136 262 135 260 133 240 126 250 123 75 (23.9) 270 149 290 134 282 139 304 138 300 135 280 130 300 132 85 (29.4) 312 150 335 137 325 141 349 141 345 137 320 134 345 137 95 (35.0) 360 152 382 140 375 143 399 143 397 139 360 136 378 140 105 (40.6) 406 154 433 143 426 145 454 146 452 142 415 137 430 142 115 (46.1) 463 155 490 146 485 147 514 149 510 145 470 139 497 145 Heating HPXA12-18 HPXA12-24 Operation Outdoor Coil Entering Air Temp. °F (°C) HPXA12-30 Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor 20 (-6.6) 265 63 295 59 340 60 278 59 288 60 315 60 282 57 30 (-1.1) 280 78 315 72 350 75 290 72 297 70 325 74 300 70 40 (4.4) 294 96 335 87 362 90 305 89 310 85 340 90 310 82 50 (10.0) 310 112 350 103 374 110 317 105 325 105 360 106 325 92 60 (15.5) 320 133 375 120 390 132 333 128 344 127 380 128 335 100 Page 17 HPXA12-36 HPXA12-42 HPXA12-48 HPXA12-60 Table 8 R410A Temperature/Pressure Temp.°F 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 6O 61 62 Pressure Psig Chart Temp.°F Pressure Psig Temp. °F Pressure Psig Temp. °F Pressure Psig 100.8 102.9 105.0 107.1 109.2 63 64 65 66 67 178.5 181.6 184.3 187.7 190.9 94 95 96 97 98 290.8 295.1 299.4 303.8 308.2 125 126 127 128 129 445.9 451.8 457.6 463.5 469.5 111.4 113.6 115.8 118.0 120.3 122.6 125.0 127.3 129.7 132.2 134.6 137.1 139.6 142.2 144.8 147.4 150.1 152.8 155.5 158.2 161.0 163.9 166.7 169.6 172.6 195.5 68 69 7O 71 72 73 74 75 76 77 78 79 8O 81 82 83 84 85 86 87 88 89 9O 91 92 93 194.1 197.3 200.6 203.9 207.2 210.6 214.0 217.4 220.9 224.4 228.0 231.6 235.3 239.0 242.7 246.5 250.3 254.1 258.0 262.0 266.0 270.0 274.1 278.2 282.3 286.5 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 312.7 317.2 321.8 326.4 331.0 335.7 340.5 345.3 350.1 355.0 360.0 365.0 370.0 375.1 380.2 385.4 390.7 396.0 401.3 406.7 412.2 417.7 423.2 428.8 434.5 440.2 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 475.6 481.6 487.8 494.0 500.2 506.5 512.9 519.3 525.8 532.4 539.0 545.6 552.3 559.1 565.9 572.8 579.8 586.8 593.8 601.0 608.1 615.4 622.7 630.1 637.5 645.0 is isolated from power and field-provided relays bypass the The outdoor unit and indoor blower cycle on demand from the room thermostat. When the thermostat blower switch is in the ON position, the indoor blower operates continuously. Service Light Operation The thermostat is not included with the unit and must be purchased separately, Some outdoor thermostats incorporate isolating contacts and an emergency heat function (which includes an amber indicating light). The service light thermostat will enable the emergency heat light function on the room thermostat, Emergency outdoor thermostats, An amber indicating light simultaneously comes on to remind the homeowner that he is operating in the emergency heat mode, Emergency heat is usually used during an outdoor unit shutdown, but it should also be used following a power outage if power has been off for over an hour and the outdoor temperature is below 50°F (10°C). System should be left in the emergency heat mode at least six hours to allow the crankcase heater sufficient time to prevent compressor slugging, Filter Brier Heat (Amber Light) An emergency heat function is designed into some room thermostats. This feature is applicable when isolation of the outdoor unit is required, or when auxiliary electric heat is staged by outdoor thermostats, When the room thermostat is placed in the emergency heat position, the outdoor unit control circuit Page 18 The unit is equipped with a large-capacity biflow filter drier which keeps the system clean and dry, If replacement is necessary, order another of the same design and capacity, The replacement filter drier must be suitable for use with R410A refrigerant, HighPressureSwitch TheHPXA12 isequipped withanauto-reset highpressure switch(single-pole, single-throw) whichis locatedonthe liquidline,Theswitchshutsoffthecompressor whendischargepressurerisesabovethefactorysetting.Theswitch is normallyclosedand is permanently adjustedto trip (open)at640+ 10psig(4412+69 kPa). LowPressureSwitch TheHPXA12isequippedwithanauto-reset lowpressure switchwhichis locatedonthevaporline.Theswitchshuts offthecompressor whenthevaporpressure fallsbelowthe factorysetting.Thisswitchis ignoredduringdefrostoperationandwhentheoutdoortemperature goesbelow15°F. Theswitchcloseswhenitisexposedto60psigandopens at25psig,It is notadjustable, HPXA12 Defrost NOTE - A Schrader core is under the pressure switches. Control Board Note - Component Locations Will Vary With Board Manufacturer Figure 17 Page 19 Demand Defrost 5-Strike System The demand defrost controller uses basic differential temperature means to detect when the system performs poorly because of ice build-up on the outdoor coil. The controller also uses "self-calibrating" principles to calibrate itself when the system starts and after every time the system defrosts. The control board has the following components: defrost relays, anti-short cycle timed-off control, pressure switch/safety control, 5-trip lockout circuit, manufacturing test mode, ambient and coil temperature sensors, field selectable termination temperature pins, and a field low voltage connection terminal strip. See figure 17. The control monitors ambient temperature, outdoor coil temperature and total run time to determine when a defrost cycle is required. Two temperature probes are permanently attached to the control. The coil temperature probe is designed with a spring clip to allow mounting to the outside coil tubing. The location of the coil sensor is important for proper defrost operation. NOTE - The logic of the demand defrost board accurately measures the performance of the system as frost accumulates on the outdoor coil. This typically will translate into longer running time between defrost cycles as more frost accumulates on the outdoor coil before the board initiates defrost cycles. The temperature probes cannot be removed from the control. The control and the attached probes MUST be replaced as a unit. Do not attempt to cut or splice probe wires. Diagnostic LEDs The defrost board uses two LEDs for diagnostics. The LEDs flash a specific sequence according to the diagnostic condition, See table 9, HI-PS/LO-PS Lockout Feature • The internal control logic of the board counts the pressure switch trips only while the Y1 (Input) line is active, If a pressure switch opens and closes twice during a Y1 (Input), the control logic will reset the pressure switch trip counter to zero at the end of the Y1 (Input), If the pressure switch opens for a fifth time during the current Y1 (Input), the control will enter a lockout condition, • The 5-strike pressure switch lockout condition can be reset by cycling OFF the 24-volt power to the control board or by shorting the TEST pins, All timer functions (run times) will also be reset, • If a pressure switch opens while the Y1 Out line is engaged, a 5-minute short cycle will occur after the switch closes, Delay Mode The defrost board has a field-selectable function to reduce occasional sounds that may occur while the unit is cycling in and out of the defrost mode. When a jumper is installed on the DELAY pins, the compressor will be cycled off for 30 seconds going in and out of the defrost mode, Units are shipped with jumper installed on DELAY pins. NOTE - The 30 second off cycle is not functional when jumpering the TEST pins. Operational Description The defrost control board has three basic operational modes: normal, defrost, and calibration, Normal Mode The demand defrost board monitors the O line, to determine the system operating mode (heat/cool), outdoor ambient temperature, coil temperature (outdoor coil) and compressor run time to determine when a defrost cycle is required, Defrost Mode Refer to table 9 for demand defrost operation, Calibration Mode Terminals The unit's automatic reset pressure switches are wired to the PS terminals. The high-pressure switch is factory wired to the HI-PS terminal, and the low-pressure switch is factory-wired to LO-PS terminal. The path between Y1 (input) and Y1 Out is interlocked through the pressure switches. When one of the pressure switches trip, the board will cycle off the compressor and the 5-strike counter in the board will count one strike. Page 20 The board is considered uncalibrated when power is applied to the board, after cool mode operation, or if the coil temperature exceeds the termination temperature when it is in heat mode. Calibration of the board occurs after a defrost cycle to ensure that there is no ice on the coil. During calibration, the temperature of both the coil and the ambient sensor are measured to establish the temperature differential which is required to allow a defrost cycle, Defrost LED 1 LED 2 OFF OFF ON OFF ON ON FLASH FLASH ON OFF ON FLASH FLASH ON ALTERNATING FLASH ALTERNATING FLASH Control Table 9 Board Diagnostic Condition Led Possible Cause(s) Solution Power problem 1 No power (24V) to board terminals R & C. 2 Board failure. 1 Check control transformer power (24V). 2 If power is available and LED(s) are unlit, replace board and all sensors. Coil sensor problem I Coil temperature outside of sensor range, 2 Faulty sensor wiring connections at board or poor sensor contact on coil. 3 Sensor failure. 1 Sensor function will resume when coil temperature is between -20°F and 110°F. 2 Check sensor wiring connections at board and sensor contact on coil. 3 Replace board and all sensors. 1 Ambient temperature sensor range, 1 Sensor function will resume when coil temperature is between -20°F and 110°F. Ambient sensor problem outside of 2 Faulty sensor wiring connections board or sensor, at 2 Check sensor wiring connections board and sensor. at 3 Sensor failure. 3 Replace board and all sensors. Normal operation Unit mode.operating normally or in standby None required. 5-Strike pressure lockout (Short test pins or reset 24V power to board to override lockout) 1 Restricted air flow over indoor or outdoor coil. 1 Remove any blockages or restrictions. Check outdoor fan motor for proper operation. 2 Check approach, superheat & subcooling temperatures. 3 Check system pressures. Repair leaks. Replace metering device. 4 Make sure that sensor is properly positioned on coil and that firm contact is established. Refer to service manual for proper placement. 2 Improper refrigerant Low pressure switch circuit open during Y1 demand charge. 3 Improper metering device operation. High pressure switch circuit open during Y1 demand 4 Poor contact between coil sensor and coil. 5-minute delay (Jumper test pins to override delay) Thermostat demand for cooling or outdoor operation. Unit operating in 5-minute anti-short-cycle mode. None required. Demand Defrost Operation The demand defrost control board initiates a defrost cycle based on either frost detection or time. Frost Detection - If the compressor runs longer than 34 minutes and the actual difference between the clear coil and frosted coil temperatures exceeds the maximum difference allowed by the control, a defrost cycle will be initiated. IMPORTANT- The demand defrost control board will allow a greater accumulation of frost and will initiate fewer defrost cycles than a time/temperature defrost system. Time - If 6 hours of heating mode compressor run time has elapsed since the last defrost cycle while the coil temperature remains below 35°F (2°C), the demand defrost control will initiate a defrost cycle. Actuation - When the reversing valve is de-energized, the Y1 circuit is energized, and the coil temperature is below 35°F (2°C), the board logs the compressor run time. If the board is not calibrated, a defrost cycle will be initiated after 34 minutes of heating mode compressor run time. The control will attempt to self-calibrate after this (and all other) defrost cycle(s). Calibration success depends on stable system temperatures during the 2g-minute calibration period. If the board fails to calibrate, another defrost cycle will be initiated after 90 minutes of heating mode compressor run time. Once the defrost board is calibrated, it will use demand defrost logic to initiate a defrost cycle. A demand defrost system initiates defrost when the difference between the clear coil and frosted coil temperatures exceeds the maximum difference allowed by the control OR after 6 hours of heating mode compressor run time has been logged since the last defrost cycle. Termination - The defrost cycle ends when the coil temperature exceeds the termination temperature or after 14 minutes of defrost operation. If the defrost is terminated by the 14-minute timer, another defrost cycle will be initiated after 34 minutes of run time. Test Mode - When Y1 is energized and 24V power is being applied to the board, a test cycle can be initiated by placing the termination temperature lumper across the 'Test" pins for 2 to 5 seconds. If the jumper remains across the 'Test" pins longer than 5 seconds, the control will ignore the test pins and revert to normal operation. The jumper will initiate one cycle per test. Page 21 Refer to the Engineering Handbook for optional accessories that may apply to this unit, The following may or may not apply: kWARNING Maintenance and service must be performed by a qualified installer or service agency. At the beginning of each cooling season, the system should be checked as follows: Outdoor Unit 1 - Clean and inspect outdoor coil (may be flushed with a water hose). Ensure power is off before cleaning. 2 - Outdoor unit fan motor is pre-lubricated and sealed, No further lubrication is needed. 3 - Visually inspect all connecting lines, joints and coils for evidence of oil leaks. 4 - Check all wiring for loose connections, 5 - Check for correct voltage at unit (unit operating), 6 - Check amp draw on outdoor fan motor. Unit nameplate Actual 7 - Inspect drain holes in coil compartment base and clean if necessary, NOTE - If insufficient heating or cooling occurs, the unit should be gauged checked, Indoor and refrigerant charge should be • • • • • • • • • • • Loss of Charge Kit High Pressure Switch Kit Compressor Monitor Compressor Crankcase Heater Hail Guards Mounting Bases Stand-off Kit Sound Cover LowAmbient Kit Monitor Kit Mild Weather Kit In order to ensure peak performance, your system must be properly maintained. Clogged filters and blocked airflow prevent your unit from operating at its most efficient level, Ask your Lennox dealer to show you where your indoor unit's filter is located. It will be either at the indoor unit (installed internal or external to the cabinet) or behind a return air grille in the wall or ceiling. Check the filter monthly and clean or replace it as needed, Disposable filters should be replaced with a filter of the same type and size. If you are unsure about the filter you need for your system, call your Lennox dealer for assistance. IMPORTANT Coil 1 - Clean coil if necessary, 2 - Check connecting lines, joints and coil for evidence of oil leaks, 3 - Check condensate line and clean if necessary, Indoor Unit Many indoor units are equipped with reusable foam filters, These filters can be cleaned with a mild soap and water solution. Rinse the filter thoroughly and let it dry completely before it is returned to the unit or grille, The filter and all access panels must be in place any time the unit is in operation. 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 service manual for pressure drop tables and procedure, 4 - Belt Drive Blowers - Check belt for wear and proper tension, 5 - Check all wiring for loose connections, 6- Check for correct voltage at unit, (blower operating) 7 - Check amp draw on blower motor. Motor nameplate Actual Your system may be equipped with an electronic air cleaner which will provide respiratory relief by removing up to 90 percent of all airborne particles which pass through it. If it is, ask your dealer to instruct you on its maintenance. Your indoor coil is equipped with a drain pan to collect condensate formed as your system removes humidity from the inside air. Have your dealer show you where the main condensate drain (and auxiliary drain, if applicable) runs and how to check the drain for any obstruction. It is also very important to provide unrestricted airflow to the outdoor unit. Leaves, trash or shrubs crowding the unit cause the outdoor unit to work harder and use more energy. Keep shrubbery trimmed away from the unit and period- Page 22 icallycheckfordebriswhichmayhavecollected aroundthe unit, Heat Pump Operation Your new Lennox heat pump has several characteristics that you should be aware of: Your heat pump satisfies heating demand by delivering large amounts of warm air into the living space. This is quite different from gas- or oil-fired furnaces or an electric furnace which deliver lower volumes of considerably hotter air to heat the space, Do not be alarmed if you notice frost on the outdoor coil in the winter months, Frost develops on the outdoor coil during the heating cycle when temperatures are below 45°F (7°C). An electronic control activates a defrost cycle lasting 5 to 15 minutes at preset intervals to clear the outdoor coil of the frost. During the defrost cycle, you may notice steam rising from the outdoor unit, This is a normal occurrence. The thermostat may engage auxiliary heat during the defrost cycle to satisfy a heating demand; however, the unit will return to normal operation at the conclusion of the defrost cycle. Your Lennox HPXA12 heat pump is equipped with a compressor crankcase heater which protects the compressor from refrigerant slugging during cold weather operation. If power to your unit has been interrupted for several hours or more, set the room thermostat selector to the "Emergency Heat" setting to obtain temporary heat without the risk of serious equipment damage, In this operating mode, all heating demand will be satisfied by auxiliary heat, Compressor operation is locked out during Emergency Heat operation. After a six-hour compressor crankcase heater warm-up period, the thermostat can be switched to the "Heat" setting and normal operation will resume, Thermostat Operation Though your thermostat may vary somewhat from the description below, its operation will be similar. Temperature Setting Levers Most heat pump thermostats have two temperature selector levers: one for heating and one for cooling. Set the levers or dials to the desired temperature setpoints for both heating and cooling. Avoid frequent temperature adjustment; turning the unit off and back on before pressures equalize puts stress on the unit compressor. Page 23 Fan Switch In AUTO or INT (intermittent) mode, the blower operates only when the thermostat calls for heating or cooling. This mode is generally preferred when humidity control is a priority. The ON or CONT mode provides continuous indoor blower operation, regardless of whether the compressor or auxiliary heat are operating. This mode is required when constant air circulation or filtering is desired. System Switch Set the system switch for heating, cooling or auto operation. The auto mode allows the heat pump to automatically switch from heating mode to cooling mode to maintain predetermined comfort settings. Many heat pump thermostats are also equipped with an emergency heat mode which locks out heat pump operation and provides temporary heat supplied by the auxiliary heat. Indicating Light Most heat pump thermostats have an amber light which indicates when the heat pump is operating in the emergency heat mode. The temperature perature. Temperature Indicator indicator displays the actual room tem- Programmable Thermostats Your Lennox system may be controlled by a programmable thermostat. These thermostats provide the added feature of programmable time-of-day setpoints for both heating and cooling. Refer to the user's information manual provided with your particular thermostat for operation details. Preservice Check If your system fails to operate, check the following before calling for service: • Check to see that all electrical disconnect switches are ON, • Make sure the room thermostat temperature selector is properly set. • Make sure the room thermostat system switch is properly set. • Replace any blown fuses, or reset circuit breakers. • Make sure unit access panels are in place. • Make sure air filter is clean. • Locate and record unit model number before calling. Start-Up JobName and Performance Job No. Job Location Check Date State City Installer Unit Model No. List State City Serial No. Service Technician Nameplate Voltage Amps: 1st stage Rated Load Ampacity Maximum Fuse or Circuit Breaker Electrical Connections Tight? [] Indoor Blower RPM Cooling (2nd stage) Liquid Line Pressure Heating (2nd stage) Liquid Line Pressure Refrigerant Lines: Indoor Filter Clean? [] -- Vapor Pressure Vapor Pressure Service Valves Fully Opened? [] Sequence of Operation Heating Correct [] Supply Voltage (Unit Off) -- S,R Drop Over Indoor (Dry) Leak Checked? [] Properly Insulated? [] Service Valve Caps Tight? [] Cooling Correct 2nd Stage Outdoor Coil Entering Air Temp. Refrigerant Charge Checked? [] Refrigerant Charge Checked? Outdoor Fan Checked? [] [] Voltage With Compressor Operating -Thermostat Calibrated? [] Properly Set? [] Level? [] [] Page 24
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