Page 1: Table Of Contents
AIR FLOW ® thermostat must be HORIZONTAL LEFT HORIZONTAL RIGHT used in communicating applications. D In non−communicating applications, the Lennox ® ComfortSense 7000 thermostat may be used, as WARNING well as other non−communicating thermostats. In all cases, setup is critical to ensure proper sys- Improper installation, adjustment, alteration, service tem operation.
Page 2: Unit Dimensions
Unit Dimensions − inches (mm) NOTE − 60C and 60D units that require air volumes over 1800 cfm 3−1/8 (79) (850 L/s) must have one of the following: 1. Return air from single side transition will accommodate 20 x 25 x1 in. (508 x 635 x 25) cleanable air filter.
Page 3: Parts Arrangement
Parts Arrangement HEAT EXCHANGER COMBUSTION AIR INDUCER COMBUSTION AIR INDUCER PRESSURE SWITCH GAS VALVE CABINET ROLLOUT SWITCH BURNER BOX INNER BLOWER ACCESS PANEL CONTROL BOX (Includes two−stage integrated control, SIGHT GLASS transformer and circuit breaker) ACCESS PANEL BLOWER ASSEMBLY FIGURE 1 Page 3...
Page 4: Sl280Uhv Gas Furnace
SL280UHV Gas Furnace WARNING Improper installation, adjustment, alteration, service The SL280UHV gas furnace is equipped with a two−stage, or maintenance can cause property damage, person- variable speed integrated control. the control is compat- al injury or loss of life. Installation and service must ible with: be performed by a licensed professional installer (or ®...
Page 5: Use Of Furnace As A Construction Heater
When this furnace is used with cooling units, it shall be installed in parallel with, or on the upstream side of, cooling Lennox does not recommend the use of SL280UHV units units to avoid condensation in the heating compartment. as a construction heater during any phase of construction.
Page 6: Combustion, Dilution & Ventilation Air
Antistatic fabric softeners for clothes dryers supervisor. Masonry acid washing materials Lennox Industries Inc. P.O. Box 799900 All gas-fired appliances require air for the combustion pro- Dallas, TX 75379−9900 cess. If sufficient combustion air is not available, the fur- nace or other appliances will operate inefficiently and un- Combustion, Dilution &...
Page 7 Unconfined Space Air from Inside An unconfined space is an area such as a basement or If the confined space that houses the furnace adjoins a large equipment room with a volume greater than 50 cubic space categorized as unconfined, air can be brought in by feet (1.42 m ) per 1,000 Btu (.29 kW) per hour of the com- providing two permanent openings between the two...
Page 8 EQUIPMENT IN CONFINED SPACE ALL AIR FROM OUTSIDE (Inlet Air from Crawlspace and Outlet Air to Ventilated Attic) CHIMNEY OR GAS VENT VENTILATION LOUVERS (Each end of attic) OUTLET WATER FURNACE HEATER INLET VENTILATION LOUVERS (For unheated crawl space) AIR FLOW NOTE−The inlet and outlet air openings shall each have a free area of at least one square inch (645 ) per 4,000 Btu (1.17 kW) per hour of the total input rating of all equipment in the enclosure.
Page 9: Setting Equipment
Upflow Applications Setting Equipment Allow for clearances to combustible materials as indicated WARNING on the unit nameplate. Minimum clearances for closet or al- cove installations are shown in figure 7. Do not install the furnace on its front or its back. Do Upflow Application Installation Clearances not connect the return air ducts to the back of the fur- nace.
Page 10 Return Air −− Upflow Applications Single Side Return Air Return air can be brought in through the bottom or either (with transition and filter) side of the furnace installed in an upflow application. If the furnace is installed on a platform with bottom return, make an airtight seal between the bottom of the furnace and the platform to ensure that the furnace operates properly and safely.
Page 11 Pivot the bottom cap down to release the bottom plications. Order kit number 51W10 (or use equivalent) panel. Once the bottom panel has been removed, reinstall from Lennox. the bottom cap. See figure 10. Allow for clearances to combustible materials as indicated on the unit nameplate.
Page 12: Filters
TABLE 1 Horizontal Application Unit Installed on Platform Filter Size Furnace Line contact is permissible Cabinet Width Side Return Bottom Return See the unit nameplate for 14−1/2" 16 X 25 X 1 (1) 14 X 25 X 1 (1) clearances. 17−1/2"...
Page 13: Venting
1 − Remove the four mounting screws (figure 14) which Venting secure the combustion air inducer / pressure switch A 4−inch diameter flue transition is factory-installed on the assembly to the orifice plate. Lift and rotate the assem- combustion air inducer outlet of all models. Figure 15 bly 90 degrees clockwise or counter clockwise to either shows the combustion air inducer as shipped from the the 3 o’clock position or to 9 o’clock position and re−se-...
Page 14 Horizontal Position HORIZONTAL RIGHT POSITION HORIZONTAL LEFT POSITION Top Vent Discharge Top Vent Discharge vent pipe vent pipe pressure switch pressure switch flue transition cover plate flue transition FLOW FLOW collector box cover plate make−up box collector box make−up box Disconnect pressure switch hose from barbed fitting on the pres- Gas supply piping must be brought into the unit from the bottom sure switch assembly.
Page 15 The SL280UHV series units are classified as fan−assisted Use self−drilling sheet metal screws or a mechanical fas- tener to firmly secure the vent pipe to the round collar of the Category I furnaces when vertically vented according to flue transition. If self−drilling screws are used to attach the the latest edition of National Fuel Gas Code (NFPA 54 / vent pipe, it is recommended that three be used.
Page 16 Common Venting Using Tile−Lined Interior Masonry Chimney and Combined Vent Connector MINIMUM LENGTH = AS SHORT AS PRACTICAL. INTERIOR TILE−LINED FOR MAXIMUM LENGTH SEE NOTE TO LEFT MASONRY CHIMNEY NOTE− Refer to provided venting tables for installations. NOTE − the chimney must be properly sized per provided venting tables or lined with listed metal lining system.
Page 17 6 − The entire length of single wall metal vent connector flue collar by self−drilling screws or other approved means, except vent connectors of listed type B vent shall be readily accessible for inspection, cleaning, material which shall be assembled according to the and replacement.
Page 18 TABLE 3 Capacity of Type B Double−Wall Vents with Type B Double−Wall Connectors Serving a Single Category I Appliance Vent and Connector Diameter − D (inches) Height Lateral 3 Inch 4 Inch 5 Inch 6 Inch Appliance Input Rating in Thousands of Btu Per Hour (feet) (feet) NOTE −...
Page 19 TABLE 4 Capacity of Type B Double−Wall Vents with Single−Wall Metal Connectors Serving a Single Category I Appliance Vent and Connector Diameter − D (inches) Height Lateral 3 Inch 4 Inch 5 Inch 6 Inch Appliance Input Rating in Thousands of Btu Per Hour (feet) (feet) NOTE −...
Page 20 TABLE 5 Vent Connector Capacity Type B Double−Wall Vents with Type B Double−Wall Connectors Serving Two or More Category I Appliances Vent and Connector Diameter − D (inches) Vent Connector 3 Inch 4 Inch 5 Inch 6 Inch Height Rise Appliance Input Rating in Thousands of Btu Per Hour (feet) (feet)
Page 21 TABLE 7 Vent Connector Capacity Type B Double−Wall Vents with Single−Wall Metal Connectors Serving Two or More Category I Appliances Vent and Connector Diameter − D (inches) Height Lateral 3 Inch 4 Inch 5 Inch 6 Inch Appliance Input Rating in Thousands of Btu Per Hour (feet) (feet) NOTE −...
Page 22 Removal of the Furnace from Common Vent 3 − Close all building doors and windows and all doors be- tween the space in which the appliances remaining In the event that an existing furnace is removed from a connected to the common venting system are located venting system commonly run with separate gas ap- and other spaces of the building.
Page 23: Gas Piping
4 − The piping should be sloped 1/4 inch (6.4 mm) per 15 Gas Piping feet (4.57 m) upward toward the meter from the fur- nace. The piping must be supported at proper intervals CAUTION [every 8 to 10 feet (2.44 to 3.01 m)] with suitable hang- ers or straps.
Page 24 Left Side Piping MANUAL (Standard) MAIN SHUT−OFF AUTOMATIC MANUAL VALVE GAS VALVE MAIN SHUT−OFF (With 1/8 in. NPT AUTOMATIC VALVE Plugged Tap GAS VALVE (With 1/8 in. NPT Shown) Plugged Tap Shown) GROUND JOINT UNION GROUND JOINT UNION DRIP LEG Right Side Piping FIELD (Alternate)
Page 25: Electrical
Refer to figure 33 for unit field wiring. See figures 30 and 31 Electrical ® for icomfort Touch thermostat wiring in communicating ELECTROSTATIC DISCHARGE (ESD) applications. Table 11 shows DIP switch and on−board link settings for non−communicating thermostat applications. Precautions and Procedures Typical wiring schematic is shown in figure 32.
Page 26 For optimal performance in non−communicating applica- 2 − When there is a heating demand the fan will run on ® tions, Lennox recommends use of a ComfortSense 7000 heating speeds for firing rate. high quality electronic digital thermostat or any other with 3 −...
Page 27 ® icomfort Touch Thermostat with SL280UHV ® icomfort Touch Thermostat with SL280UHV and Non−Communicating Outdoor Unit and icomfortt−ENABLED Outdoor Unit ® ® icomfort Touch Thermostat icomfort Touch Thermostat icomfortt−Enabled SL280UHV Indoor Furnace icomfortt−Enabled SL280UHV Indoor Furnace Non−Communicating Outdoor Air Conditioner icomfortt−Enabled Outdoor Air Conditioner or Heat Pump icomfortt−...
Page 28 ® Optional Accessories for use with any icomfort Touch System ® NOTE: icomfort Touch THERMOSTAT SENSES HUMIDITY & CONTROLS HUM CONTACTS TO CYCLE HUMIDIFIER 120V CONNECTIONS BASED ON DEMAND. NO OTHER CONTROL OR HUMIDIS- TAT REQUIRED. HUM" CONTACT IS CLOSED ANYTIME OPTIONAL OUTDOOR AIR SENSOR FOR USE WITH HU- HUMIDITY DEMAND MIDIFIER (IF NOT ALREADY IN THE SYSTEM FOR OTHER...
Page 29 TABLE 11 SL280 Field Wiring Applications With Conventional Thermostat DIP Switch Settings and On−Board Links (See figure 34) DIP Switch 1 On Board Links Must Be Cut To Select Thermostat Thermostat Wiring Connections System Options Heating Stages 1 Heat / 1 Cool FURNACE OUTDOOR T’STAT...
Page 30 TABLE 11 SL280 Field Wiring Applications With Conventional Thermostat (Continued) DIP Switch Settings and On−Board Links (See figure 34) DIP Switch 1 On Board Links Must Be Cut To Select Thermostat Thermostat Wiring Connections System Options Heating Stages 2 Heat / 2 Cool FURNACE OUTDOOR T’STAT...
Page 31 TABLE 11 SL280 Field Wiring Applications With Conventional Thermostat (Continued) DIP Switch Settings and On−Board Links (figure 34) DIP Switch 1 Thermostat On Board Links Must Be Cut To Select Wiring Connections Thermostat Heating System Options Stages Dual Fuel FURNACE HEAT PUMP L7724U TERM.
Page 32 TABLE 11 SL280 Field Wiring Applications With Conventional Thermostat (Continued) DIP Switch Settings and On−Board Links (figure 34) DIP Switch 1 Thermostat On Board Links Must Be Cut To Select Wiring Connections Thermostat Heating System Options Stages Dual Fuel FURNACE HEAT PUMP L7724U TERM.
Page 33 SL280UHV Schematic Wiring Diagram FIGURE 32 Page 33...
Page 34 TYPICAL SL280UHV FIELD WIRING DIAGRAM FIELD INSTALLED CLASS II 24V FIELD INSTALLED LINE VOLTAGE FIGURE 33 Page 34...
Page 35 Integrated Control HS/ CAI LINE 1 NEUTRAL 7 SEGMENT LED FLAME SENSE INDOOR BLOWER DIAGNOSTIC CONNECTOR PUSH BUTTON DIP SWITCHES 12 PIN LOW OUTDOOR AIR VOLTAGE SENSOR CONNECTOR TERMINALS DISCHARGE AIR W915 Y1 TO Y2 SENSOR 2 STAGE COMPR TERMINALS W951 R TO O HEAT PUMP TB83...
Page 36: Integrated Control Settings
settings provide lower supply air temperatures; shorter set- Integrated Control DIP Switch Settings − tings provide higher supply air temperatures.Table 12 pro- Conventional Thermostat (non−communi- vides the blower off timings that will result from different cating) switch settings. TABLE 12 SL280UHV units are equipped with a two−stage, variable Blower Off Delay Switch Settings speed integrated control.
Page 37: Table 15
TABLE 15 Ramping Option D S Motor runs at 100% until demand is satisfied. Cooling Mode Blower Speed Ramping Ramping Option Switch 9 Switch 10 S Once demand is met, motor ramps down to stop. A (Factory) 100% CFM COMPRESSOR DEMAND Ramping Option A (Factory Selection) Switches 11, 12 and 13 −−...
Page 38 On−Board Link W915 2 Stage Compr (Y1 to Y2) On−Board Links On−board link W915 is a clippable connection between ter- minals Y1 and Y2 on the integrated control. W915 must be Note: In icomfortt systems with a conventional outdoor cut if two−stage cooling will be used. If the Y1 to Y2 link is unit (non−communicating), the on−board clippable links not cut the outdoor unit will operate in second−stage cooling must be set to properly configure the system.
Page 39: Blower Performance Data
First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 500 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 425 cfm. Page 39...
Page 40 First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 500 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 455 cfm. Page 40...
Page 41 First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 500 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 455 cfm. Page 41...
Page 42 First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 500 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 455 cfm. Page 42...
Page 43 First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 500 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 480 cfm. Page 43...
Page 44 First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 500 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 480 cfm. Page 44...
Page 45 First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 500 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 485 cfm. Page 45...
Page 46 First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 500 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 485 cfm. Page 46...
Page 47 First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 500 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 426 cfm. Page 47...
Page 48 First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 500 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 495 cfm. Page 48...
Page 49 With Heat Pump − Cut W914 (R to DS) & W951 (R to O) on SureLight control setpoint** ® Dave Lennox ComfortSense 7000 thermostat to use for this application − Y2081 4 heat / 2 cool *Dehumidification blower speed is 70% of COOL speed for all units . ®...
Page 50 With Heat Pump − Cut W914 (R to DS) & W951 (R to O) on SureLight control ® Dave Lennox ComfortSense 7000 thermostat to use for this application − Y2081 4 heat / 2 cool *Normal operation first stage cooling blower speed is 70% COOL speed.
Page 51: Unit Start−Up
2 − Set the thermostat to the lowest setting. Unit Start−Up 3 − Turn off all electrical power to the unit. FOR YOUR SAFETY READ BEFORE LIGHTING 4 − This furnace is equipped with an ignition device which automatically lights the burners. Do not try to light the WARNING burners by hand.
Page 52: Gas Pressure Adjustment
Check flue and outlet NOTE − Pressure test adapter kit (10L34) is available from for blockages. Lennox to facilitate manifold pressure measurement. 11 −Are flame rollout switches tripped? If flame rollout 1 − Connect test gauge to manifold pressure post (figure switches are tripped, call the service technician for in- 35) or tap (figure 36) on gas valve.
Page 53: High Altitude
High Altitude IMPORTANT The manifold pressure, gas orifice and pressure switch For safety, shut unit off and remove manometer as may require adjustment or replacement to ensure proper soon as an accurate reading has been obtained. operation at higher altitudes. Tables 22 through 25 shows Take care to replace pressure tap plug.
Page 54: Other Unit Adjustments
Applications Using a Two−Stage Thermostat Other Unit Adjustments See figure 37 for ignition control sequence A − Heating Sequence −− Integrated Control Thermostat Selection DIP Switch 1 OFF in Two−Stage" Position Primary and Secondary Limits (Factory Setting) 1 − On a call for heat, thermostat first−stage contacts close The primary limit is located on the heating compartment sending a signal to the integrated control.
Page 55 Applications Using A Single−Stage Thermostat 4 − After the 20−second warm−up period has ended, the gas valve is energized on low fire (first stage) and ignition oc- See figure 38 for ignition control sequence curs. At the same time, the control module sends a sig- B −...
Page 56: Service
Flue And Chimney Service 1 − Check flue pipe, chimney and all connections for tight- ness and to make sure there is no blockage. 2 − Check unit for proper draft. WARNING Electrical 1 − Check all wiring for loose connections. ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD.
Page 57 SL280UHV BURNER, COMBUSTION AIR INDUCER ASSEMBLY & HEAT EXCHANGER REMOVAL gasket pressure switch rollout switch flue transition ignitor heat exchanger collector box burner box assembly orifice plate sensor combustion air inducer gasket burners manifold and gas valve retention rings burner box cover plate cross over FIGURE 39 9 −...
Page 58 SL280UHV NOX INSERTS 18− Reconnect all wires. 19− Reconnect top cap and vent pipe to combustion air in- ducer outlet. 20− Reconnect gas supply piping. 21− Turn on power and gas supply to unit. 22− Set thermostat and check for proper operation. 23−...
Page 59: Planned Service
Repair Parts List The following repair parts are available through independent Lennox dealers. When ordering parts, include the complete furnace model number listed on the CSA International nameplate −− Example: SL280UH070V36A. All service must be performed by a licensed professional installer (or equivalent), service agency, or gas supplier.
Page 60: Integrated Control Diagnostic Codes
Integrated Control Diagnostic Modes Display Action (when button released) No change (idle)* Remain in idle mode Solid E" Enter diagnostic recall mode Solid D" Discharge Air Installed Solid F" Enter flame signal mode Solid P" (variable speed only) Program unit capacity/size (Unit Code)** * No change implies the display will continue to show whatever is currently being displayed for normal operation (blinking decimal, active error code, heat state, etc..) ** After the P"...
Page 61 Integrated Control Diagnostic Codes (continued) Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E 105 Device communication problem − No other devices on RS BUS (Commu- Equipment is unable to communicate. Indicates nication numerous message errors. In most cases errors are system).
Page 62 Integrated Control Diagnostic Codes (continued) E 131 Corrupted control parameters (Verify configuration of system). Communi- Reconfigure the system. Replace control if heating cating only. or cooling is not available. Only applicable in the communicating mode, not in startup. Exit from Com- missioning and Execute ’Set Factory Default mode’.
Page 63 Integrated Control Diagnostic Codes (continued) Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E 223 Low pressure switch failed open. Check pressure (inches w.c.) of low pressure switch closing on heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air in- ducer for correct operation and restriction.
Page 64 Integrated Control Diagnostic Codes (continued) E 272 Soft lockout − Exceeded maximum number of recycles. Last recycle due Check operation of low pressure switch to see if it is to the pressure switch opening. stuck closed on heat call. Check pressure (inches w.c.) of high pressure switch closing on heat call.
Page 65 Integrated Control Diagnostic Codes (continued) Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E 312 Restricted air flow in cooling or continuous fan mode is lower than cfm Warning Only. Restricted airflow − Indoor blower is setting. running at a reduced CFM (Cutback Mode −...
Page 66 Integrated Control Diagnostic Codes (continued) E 406 LSOM − Compressor open start circuit. Required amount of current is not passing through Start current transformer. Clears the error after cur- rent is sensed in START sensor, or after power re- set. E 407 LSOM −...
Page 67: Program Unit Capacity/Size Mode
Program Unit Capacity/Size Mode − − Power−Up − Number displayed represents by integrated control unit size code (furnace model − and capacity). If three horizontal bars are displayed followed by continuous E203, furnace control does not recognize unit size code. Configure per the following: Furnace control in IDLE mode No heating, cooling or indoor fan operation)
Page 68: Troubleshooting
Troubleshooting: Heating Sequence of Operation CALL FOR FIRST−STAGE HEAT CALL FOR 1ST STAGE HEAT (LOW FIRE) INDOOR BLOWER OFF AFTER HEAT FAN OFF DELAY (LOW HEAT SPEED) INDOOR LIMIT BLOWER OFF HIGH ERROR SWITCH WATCHGUARD − INDOOR AFTER HEAT FAN LIMIT SWITCH CODE CLOSED WITHIN 3...
Page 69 Troubleshooting: Heating Sequence of Operation (Continued) CALL FOR SECOND−STAGE HEAT CALL FOR 2ND STAGE HEAT (HIGH FIRE) SINGLE STAGE 2 STAGE THERMOSTAT THERMOSTAT 2ND STAGE RECOGNITION DELAY ON DELAY (30 SECONDS) EXPIRED? ONLY FOR 1ST EXPIRED? REQUEST FOR 2ND STAGE HEAT INDUCER SWITCHED TO HIGH SPEED HIGH...
Page 70 Troubleshooting: Heating Sequence of Operation (Continued) CALL FOR HEAT SATISFIED FIRST−STAGE HEAT SECOND−STAGE HEAT RUN MODE: 1ST OR 2ND STAGE CALL FOR HEAT. ALL INPUTS MONITORED (LIMIT, PRESSURE, CALL FOR HEAT/COOL, FLAME LEVEL) 2ND STAGE HEAT 2ND STAGE CALL FOR HEAT SATISFIED? DE−ENERGIZE 2ND STAGE GAS VALVE...
Page 71 Troubleshooting: Cooling Sequence of Operation (Continued) CALL FOR COOLING 1ST STAGE COOLING REQUEST RECEIVED WAIT FOR COMPRESSOR TIMED OFF DELAY TO EXPIRE ENERGIZE 1ST STAGE COOLING CONTACTOR (COMPRESSOR & FAN) INDOOR BLOWER 2 SECOND ON DELAY ENERGIZE INDOOR BLOWER (LOW COOLING MODE) MAINTAIN INDOOR BLOWER (LOW COOLING MODE)
Page 72 Troubleshooting: Continuous Fan Sequence of Operation CALL FOR FAN CALL FOR FAN INDOOR BLOWER ON CONTINUOUS FAN SPEED CALL FOR FAN MAINTAIN INDOOR REMOVED? BLOWER AT CONTINUOUS FAN REQUEST MAINTAIN INDOOR FOR COOLING GO TO CALL FOR COOLING BLOWER AT RECEIVED? CONTINUOUS FAN REQUEST...

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