Lennox SL280UHV Installation Instructions Manual
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Lennox SL280UHV Installation Instructions Manual

Sl280uhv series dave lennox signature collection gas furnace upflow / horizontal air discharge
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See also: User Instruction Manual , User's Information Manual
E 2011 Lennox Industries Inc.
Dallas, Texas, USA
AIR FLOW
HORIZONTAL LEFT
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person-
al injury or loss of life. Installation and service must
be performed by a licensed professional installer (or
equivalent), service agency or the gas supplier.
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06/11
*2P0611*
UPFLOW
AIR FLOW
AIR FLOW
HORIZONTAL RIGHT

Table of Contents

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INSTALLATION
INSTRUCTIONS
SL280UHV
DAVE LENNOX SIGNATURE
COLLECTION GAS FURNACE
UPFLOW / HORIZONTAL AIR DISCHARGE
506763−01
06/2011
Supersedes 03/2011
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
This a safety alert symbol and should never be ignored.
When you see this symbol on labels or in manuals, be alert
to the potential for personal injury or death.
As with any mechanical equipment, personal injury
can result from contact with sharp sheet metal
edges. Be careful when you handle this equipment.
A thermostat is not included and must be ordered
separately.
D The Lennox icomfort Touch
used in communicating applications.
D In non−communicating applications, the Lennox
ComfortSense
well as other non−communicating thermostats.
In all cases, setup is critical to ensure proper sys-
tem operation.
Field wiring for both communicating and non−com-
municating applications is illustrated in diagrams,
which begin on Page 27.
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CAUTION
NOTICE
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thermostat must be
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7000 thermostat may be used, as
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506763−01
*P506763-01*
Litho U.S.A.
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Summary of Contents for Lennox SL280UHV

  • 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...

  • Page 5: Use Of Furnace As A Construction Heater

    Never use an open flame to test for gas leaks. Check all This SL280UHV furnace must be installed so that its elec- connections using a commercially available soap solution trical components are protected from water.

  • Page 6: Combustion, Dilution & Ventilation Air

    SL280UHV furnaces to ensure effi- cient and safe operation. You must consider combustion air an unconfined or a confined space.
  • 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

    Doing so will adversely affect the operation of the safety control devices, which could result in per- sonal injury or death. The SL280UHV gas furnace can be installed as shipped in either the upflow position or the horizontal position. Left Side...
  • 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 Horizontal Applications Remove the two screws that secure the bottom cap to the The SL280UHV furnace can be installed in horizontal ap- furnace. Pivot the bottom cap down to release the bottom plications. Order kit number 51W10 (or use equivalent) panel.

  • 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 inches (152 mm) from the furnace vent outlet. See figure SL280UHV is not approved for use with horizontal venting.. NOTE − Use these instructions as a guide. They do not su- Venting Using a Masonry Chimney persede local codes.
  • Page 16 (interior or outside General Venting Requirements wall) is PROHIBITED. The chimney must first be lined Vent all SL280UHV furnaces according to these instruc- with either type B1 vent or an insulated single wall tions: flexible vent lining system which has been sized ac- 1 −...
  • 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

    National Electric Code (ANSI/NFPA No. 70). A green ground wire is provided in the field make−up box. NOTE − The SL280UHV furnace contains electronic components that are polarity sensitive. Make sure that the furnace is wired correctly and is properly grounded.
  • Page 26 38% of cool speed. 9 − Install the room thermostat according to the instruc- 2 − When the SL280UHV is running in the heating mode, tions provided with the thermostat. See table 11 for the indoor blower will run on the heating speed desig- field wiring connections in varying applications.
  • Page 27 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− ENABLED icomfortt− SL280UHV ENABLED...
  • Page 28 HUMIDITY DEMAND MIDIFIER (IF NOT ALREADY IN THE SYSTEM FOR OTHER IS PRESENT FUNCTIONS. BUILT INTO ALL icomfort by Lennoxt OUT- DOOR UNITS). icomfortt ENABLED 24V HUMIDIFIER CONNECTIONS SL280UHV FURNACE Discharge Air Sensor (Required for even heat) CS 7000 THERMOSTAT ®...

  • Page 29: Sl280 Field Wiring Applications Table

    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

    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

    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

    TABLE 12 SL280UHV units are equipped with a two−stage, variable Blower Off Delay Switch Settings speed integrated control. This control manages ignition timing, heating mode fan off delays and indoor blower...

  • 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 Links

    Refer to table 18 for operation sequence in ap- button is released. plications including SL280UHV, a thermostat which fea- Error Code Recall Mode tures humidity control and a single−speed outdoor unit.

  • 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 TABLE 18 OPERATING SEQUENCE SL280UHV, Non−Communicating Thermostat with Humidity Control Feature and Single−Speed Outdoor Unit OPERATING SYSTEM DEMAND SYSTEM RESPONSE SEQUENCE Thermostat Demand Relative Humidity Blower System Compres- Step Comments Condition Status (COOL) NO CALL FOR DEHUMIDIFICATION Compressor and indoor...
  • Page 50 TABLE 19 OPERATING SEQUENCE SL280UHV, Non−Communicating Thermostat with Humidity Control Feature and Two−Speed Outdoor Unit OPERATING SYSTEM DEMAND SYSTEM RESPONSE SEQUENCE Thermostat Demand Relative Humidity Blower System Compressor Comments Condition Status (COOL) NO CALL FOR DEHUMIDIFICATION Normal Opera- Acceptable 70%* Compressor and indoor tion −...

  • Page 51: Unit Start−Up

    INLET PRESSURE TAP (under cap) ON SIDE The gas valve on the SL280UHV unit will be equipped with a gas control switch. Use only your hand to move the switch. Never use tools. If the switch will not turn or if the control switch will not move by hand, do not try to repair it.

  • Page 52: Gas Pressure Adjustment

    Furnace should operate minimum 15 minutes with correct manifold pressure and gas flow rate before checking com- bustion. Table 21 shows acceptable combustion for ALL SL280UHV models. The maximum carbon monoxide read- ing should not exceed 50 ppm. TABLE 21...

  • 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

    The two−stage, variable speed integrated control used in blower motor is switched to the low−fire heating speed. SL280UHV units has an added feature of an internal Watch- 8 − When the thermostat demand for low−fire (first stage) guard control. The feature serves as an automatic reset de- heat is satisfied, the gas valve is de−energized and the...
  • 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

    All SL280UHV filters are installed external to the unit. Fil- 7 − Remove screws securing burner box and remove ters should be inspected monthly. Clean or replace the fil- burner box.
  • 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...
  • 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.

  • 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...

This manual is also suitable for:

Sl280uh070v36aSl280uh090v36bSl280uh090v48bSl280uh090v60cSl280uh110v60cSl280uh135v60d

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