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Lennox iComfort SL280UH070V36A Manual
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Lennox iComfort SL280UH070V36A Manual

Enabled sl280uhv(x) series units
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Service Literature
iComfort
SL280UHV(X) series units are 80% efficiency gas furnaces
used for upflow or horizontal applications only, manufac­
tured with Lennox Duralokt heat exchangers formed of
aluminized steel. SL280UHV(X) units are available in heat­
ing capacities of 66,000 to 132,000 Btuh and cooling ap­
plications up to 5 tons. Refer to Engineering Handbook for
proper sizing.
Units are factory equipped for use with natural gas. Kits are
available for conversion to LPG operation. SL280UHV(X)
model units are equipped with the iComfort
®
eLight
two-stage variable speed integrated control.
SL280UHV(X) unit meets the California Nitrogen Oxides
(NO
) Standards and California Seasonal Efficiency re­
x
quirements. All units use a redundant gas valve to assure
safety shut-off as required by C.S.A.
All specifications in this manual are subject to change. Pro­
cedures outlined in this manual are presented as a recom­
mendation only and do not supersede or replace local or
state codes. In the absence of local or state codes, the
guidelines and procedures outlined in this manual (except
where noted) are recommendations only and do not consti­
tute code.
TABLE OF CONTENTS
Specifications
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I Unit Components
. . . . . . . . . . . . . . . . . . . . . . . .
II Installation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
III Start Up
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IV Heating System Service Checks
V Typical Operating Characteristics
VI Maintenance
. . . . . . . . . . . . . . . . . . . . . . . . . .
VII Wiring and Sequence of Operation
VIII Field Wiring and Jumper Settings
IX Program Unit Capacity Size Mode
X Troubleshooting
. . . . . . . . . . . . . . . . . . . . . . . .
Corp. 1116-L4
Revised 04/2020
®
ENABLED SL280UHV(X) SERIES UNITS
®
enabled Sur­
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Page 5
Page 43
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Page 44
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Page 47
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Page 59
Page 60
Page 1
SL280UHV(X)
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 HVAC in­
staller (or equivalent), service agency or the gas sup­
plier.
CAUTION
As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal in­
jury. Take care while handling this equipment and
wear gloves and protective clothing.
© 2016 Lennox Industries Inc.

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Summary of Contents for Lennox iComfort SL280UH070V36A

  • Page 1 SL280UHV(X) series units are 80% efficiency gas furnaces used for upflow or horizontal applications only, manufac­ tured with Lennox Duralokt heat exchangers formed of aluminized steel. SL280UHV(X) units are available in heat­ ing capacities of 66,000 to 132,000 Btuh and cooling ap­...
  • Page 2 SPECIFICATIONS Model No. SL280UH070V36A SL280UH090V36B SL280UH090V48B Heating Model No. - Low Nox SL280UH070XV36A - - - SL280UH090XV48B Performance AFUE High Input - Btuh 66,000 88,000 88,000 Fire Output - Btuh 52,000 70,000 70,000 Temperature rise range - °F 40 - 70 40 - 70 40 - 70 Gas Manifold Pressure (in.
  • Page 3 OPTIONAL ACCESSORIES - MUST BE ORDERED EXTRA “A” Width “B” Width “C” Width “D” Width Models Models Models Models CABINET ACCESSORIES Horizontal Suspension Kit - Horizontal only 51W10 51W10 51W10 51W10 Return Air Base - Upflow only 65W75 50W98 50W99 51W00 CONTROLS ComfortSense...
  • Page 4 SL280UHV Parts Arrangement HEAT EXCHANGER COMBUSTION AIR INDUCER COMBUSTION AIR INDUCER PRESSURE SWITCH GAS VALVE CABINET BURNER BOX INNER BLOWER PRIMARY LIMIT ACCESS PANEL CONTROL BOX (Includes two-stage integrated control, transformer and circuit breaker) SIGHT GLASS SECONDARY LIMITS (2 switches) ACCESS PAN­...
  • Page 5 I-UNIT COMPONENTS 3. Circuit Breaker (CB8) A 24V circuit breaker is also located in the control box. The switch provides overcurrent protection to the trans­ SL280UHV(X) unit components are shown in figure 1. The former (T1). The breaker is rated 3A at 32V. If the current gas valve, combustion air inducer and burners can be ac­...
  • Page 6 the combustion air inducer is energized on low (first stage) TABLE 1 heat speed. When the differential in the prove switch is ® SureLight Control 5 Pin Terminal Designation great enough, the prove switch closes and a 15-second PIN # Function pre-purge begins.
  • Page 7 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 8 INTEGRATED CONTROL CONFIGURATION GUIDE CLG BLOWER SPEED ADJUSTMENT 2ND STAGE HEAT ON DELAY DEFAULT 7 MIN CONTINUOUS FAN MODE BLOWER SPEED UPSTAGE THERMOSTAT SELECTION DELAY + 10% MEDIUM−LOW SPEED TWO STAGE (38%) THERMOSTAT 12 MIN UPSTAGE − 10% MEDIUM−HIGH DELAY SPEED 1−STAGE (70%)
  • Page 9 TABLE 4 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..)
  • Page 10 TABLE 5 Integrated Diagnostic Codes/Status of Equipment I. Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover Idle mode (Decimal blinks at 1 Hertz -- 0.5 second ON, 0.5 second OFF). Cubic feet per minute (cfm) setting for indoor blower (1 second ON, 0.5 second OFF) / cfm setting for current mode displayed.
  • Page 11 TABLE 5 Continued Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E 124 Active communicating thermostat signal missing for more than 3 min­ Equipment lost communication with the thermostat. utes. Check four wiring connections, ohm wires and cycle power at the thermostat.
  • Page 12 TABLE 5 Continued Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E 206 Gas valve second-stage relay failure Furnace will operate on 1 stage for remainder of the heating demand. Will clear after fault recovered. If unable to operate 2nd stage, replace control. E 207 Hot surface ignitor sensed open - Refer to troubleshooting.
  • Page 13 TABLE 5 Continued Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E 271 Soft lockout - Exceeded maximum number of retries. Last retry failed due Check pressure (inches w.c.) of low pressure switch to the pressure switch opening. closing on heat call.
  • Page 14 TABLE 5 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 - The variable speed motor has pre-set speed and torque limiters to protect the motor from damage caused by operating outside of design parameters (0 to 0.8”...
  • Page 15 TABLE 5 Continued Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover 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.
  • Page 16 -10% to better suit the application. Table 8 below provides Ramping Option C S Motor runs at 100% until demand is satisfied. blower speed adjustments that will result from different switch settings. Refer to tables for corresponding cfm val­ S Once demand is met, motor runs at 100% for 45 sec­ ues.
  • Page 17 Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 250 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 250 cfm. SL280UH070V36A BLOWER MOTOR WATTS (COOLING) Motor Watts @ Various External Static Pressures - in.
  • Page 18 Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 250 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 250 cfm. SL28UH070V36A BLOWER MOTOR WATTS (COOLING) Motor Watts @ Various External Static Pressures - in.
  • Page 19 Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 250 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 250 cfm. SL280UH090V36B BLOWER MOTOR WATTS (COOLING) Motor Watts @ Various External Static Pressures - in.
  • Page 20 Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 250 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 250 cfm. SL280UH090V36B BLOWER MOTOR WATTS (COOLING) Motor Watts @ Various External Static Pressures - in.
  • Page 21 Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 380 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 380 cfm. SL280UH090V48B BLOWER MOTOR WATTS (COOLING) Motor Watts @ Various External Static Pressures - in.
  • Page 22 Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 380 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 380 cfm. SL280UH090V48B BLOWER MOTOR WATTS (COOLING) Motor Watts @ Various External Static Pressures - in.
  • Page 23 Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 380 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 380 cfm. SL280UH090V48B BLOWER MOTOR WATTS (COOLING) Motor Watts @ Various External Static Pressures - in.
  • Page 24 Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 450 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 450 cfm. SL280UH090V60C BLOWER MOTOR WATTS (COOLING) Motor Watts @ Various External Static Pressures - in.
  • Page 25 Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 450 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 450 cfm. SL280UH090V60C BLOWER MOTOR WATTS (COOLING) Motor Watts @ Various External Static Pressures - in.
  • Page 26 Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 450 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 450 cfm. SL280UH090V60C BLOWER MOTOR WATTS (COOLING) Motor Watts @ Various External Static Pressures - in.
  • Page 27 Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 450 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 450 cfm. SL280UH110V60C BLOWER MOTOR WATTS (COOLING) Motor Watts @ Various External Static Pressures - in.
  • Page 28 Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 450 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 450 cfm. SL280UH110V60C BLOWER MOTOR WATTS (COOLING) Motor Watts @ Various External Static Pressures - in.
  • Page 29 Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 450 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 450 cfm. SL280UH110V60C BLOWER MOTOR WATTS (COOLING) Motor Watts @ Various External Static Pressures - in.
  • Page 30 Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 450 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 450 cfm. SL280UH135V60D BLOWER MOTOR WATTS (COOLING) Motor Watts @ Various External Static Pressures - in.
  • Page 31 Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 450 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 450 cfm. SL280UH135V60D BLOWER MOTOR WATTS (COOLING) Motor Watts @ Various External Static Pressures - in.
  • Page 32 With Heat Pump - Cut W914 (R to DS) & W951 (R to O) on SureLight control setpoint** ® Use Dave Lennox ComfortSense 7000 thermostat Y2081 4 heat / 2 cool for this application *Dehumidification blower speed is 70% of COOL speed for all units . ®...
  • Page 33 With Heat Pump - Cut W914 (R to DS) & W951 (R to O) on SureLight control ® Use Dave Lennox ComfortSense 7000 thermostat Y2081 4 heat / 2 cool for this application. *Normal operation first stage cooling blower speed is 70% COOL speed.
  • Page 34 DC filter capacitors inside the controller. If the discon­ nect switch is bounced when the disconnect is closed, the dis­ Earlier ECM motors used on other Lennox furnace models are not interchangeable with motors used on connect contacts may become welded. Try not to bounce the the SL280UH furnace line.
  • Page 35 Motor Start‐Up Troubleshooting Motor Operation When B3 begins start‐up, the motor gently vibrates back and To verify motor operation see steps below and figures 8 forth for a moment. This is normal. During this time the elec­ tronic controller is determining the exact position of the rotor. and 9.
  • Page 36 BLOWER B3 HARNESS CONNECTORS BLOWER B3 HARNESS CONNECTORS P48 5 Pin SHAFT P48 5 Pin P49 4 Pin SHAFT P49 4 Pin MOTOR with INTEGRATED CONTROLLER MOTOR with INTEGRATED CONTROLLER J48 5 Pin J49 4 Pin P48 5 Pin P49 4 Pin J49 4 Pin Control Connector J48 5 Pin Line Voltage Connector J48 Connector...
  • Page 37 Troubleshooting Motor Windings TEST A Measure the resistance between each of the three motor Ensure that motor windings are not damaged by perform­ leads (3-pin plug) and the unpainted part of the end shield. ing the following tests: If the winding resistance to ground is <100k ohms, replace the motor and control module.
  • Page 38 The switch may have a different type valve must be used. set point for each unit model number. See Lennox Repair 24VAC terminals and gas control knob are located on the Parts Handbook if limit switch must be replaced, valve.
  • Page 39 SL280UHV HEATING COMPONENTS Ignitor Rollout Switch (alternate location) Burner Assembly Rollout Switch Rollout Switch Gas Valve Sensor Burner Box Front Panel Screw (remove and panel will swing open and off) FIGURE 13 Page 39...
  • Page 40 SL280UH Ignitor Check Out Test 1 Remove 5-pin plug from control Check ohms reading across terminals 1and 5 Ohm value should be between 39 - 70. Meter (set to ohms) Integrated control detail Test 2 Seperate the 2-pin jack plug near the manifold and check resistance of the ignitor.
  • Page 41 NOTE - Each furnace model uses a unique CAI. Refer to Lennox Repair Parts listing for correct inducer for replace­ ment. COMBUSTION AIR PRESSURE SWITCH A proving switch connected to the combustion air inducer orifice plate is used to prove inducer operation.
  • Page 42 Multiple Venting screws, rotate the assembly (assembly consists of orifice plate, proving switch, gasket and combustion air inducer), The SL280UHV(X) furnace can vent in multiple positions. then reinstall the mounting screws. See unit Installation In­ See figure 16. structions for more detail. The make up box may be removed and the combustion air IMPORTANT inducer may be rotated clockwise or counterclockwise 90°...
  • Page 43 II-PLACEMENT AND INSTALLATION HONEYWELL GAS VALVE Make sure unit is installed in accordance with installation HIGH FIRE ADJUSTING SCREW instructions and applicable codes. INLET PRESSURE TAP (under cap) ON SIDE III-START‐UP A-Preliminary and Seasonal Checks 1 - Inspect electrical wiring, both field and factory installed for loose connections.
  • Page 44 Kitchen detergents can cause harmful corro­ sion on various metals used in gas piping. Use of a specialty Gas Leak Detector is strongly recommended. It is available through Lennox under part number 31B2001. See Corp. CAUTION 8411-L10, for further details.
  • Page 45 2 - Ignite unit on low fire and let run for 5 minutes to allow IMPORTANT for steady state conditions. 3 - After allowing unit to stabilize for 5 minutes, record For safety, shut unit off and remove manometer as manifold pressure and compare to value given in table soon as an accurate reading has been obtained.
  • Page 46 TABLE 19 Manifold Pressure Settings Manifold Manifold Manifold Supply Line Orifice Size Pressure in.wg. Pressure in.wg. Pressure in.wg. Pressure Unit Orifice Size 7501 - 0-4500 ft. 4501-7500 ft. 7501 - 10,000 ft. in. w.g. Input 0 - 7500 ft. 10,000 ft. High High High...
  • Page 47 V-TYPICAL OPERATING CHARACTERISTICS C-External Static Pressure A-Blower Operation and Adjustment 1 - Tap locations shown in figure 21. 1 - Blower operation is dependent on thermostat control 2 - Punch a 1/4” diameter hole in supply and return air ple­ system.
  • Page 48 Annual Furnace Maintenance At the beginning of each heating season, and to comply 7- Inspect the combustion air inducer and clean if neces­ with the Lennox Limited Warranty, your system should sary. be checked by a licensed professional technician (or equiv­...
  • Page 49 A-Heat Exchanger and Burners 13- To clean the combustion air inducer visually inspect and using a wire brush clean where necessary. Use Cleaning the Heat Exchanger and Burners compressed air to clean off debris and any rust. NOTE - Use papers or protective covering in front of the fur­ nace during cleaning.
  • Page 50 SL280UHV BURNER, C.A.I ASSEMBLY & HEAT EXCHANGER REMOVAL gasket pressure switch flue transition rollout switches heat exchanger collector box (alternate location) orifice plate burners combustion air inducer rollout switch retention rings rollout switch gasket manifold and gas valve burner box cover plate cross over FIGURE 22 Remove 5 screws if necessary...
  • Page 51 VII- Wiring and Sequence of Operation Integrated Control Self Check WARNING When there is a call for heat, the icomfortt enabled inte­ Electric Shock Hazard. Can cause grated control runs a self check. The control checks for S10 injury or death. Unit must be properly grounded in accordance with national primary limit, S21 secondary limit (s) and S47 rollout switch and local codes.
  • Page 52 8 - When the thermostat demand for low-fire (first stage) CAUTION heat is satisfied, the gas valve is de-energized and the field-selected indoor blower off delay begins. The Failure to use properly sized wiring and circuit combustion air inducer begins a 5-second post-purge breaker may result in property damage.
  • Page 53 ® icomfort WI-Fi Thermostat with SL280UHV ® icomfort Wi-Fi Thermostat with SL280UHV and Non-Communicating Outdoor Unit and icomfortt-ENABLED Outdoor Unit ® ® icomfort Wi-Fi Thermostat icomfort Wi-Fi 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...
  • Page 54 ® Optional Accessories for use with any icomfort Touch System ® NOTE: icomfort Wi-Fi 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...
  • Page 55 VIII- SL280 Field Wiring Applications With Conventional Thermostat DIP Switch Settings and On-Board Links (See figure 4) 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 56 SL280 Field Wiring Applications With Conventional Thermostat (Continued) DIP Switch Settings and On-Board Links (See figure 4) 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 57 SL280 Field Wiring Applications With Conventional Thermostat (Continued) DIP Switch Settings and On-Board Links (figure 4) DIP Switch 1 Wiring Connections Thermostat On Board Links Must Be Cut To Select Thermostat Heating System Options Stages Dual Fuel FURNACE HEAT PUMP L7742U TERM.
  • Page 58 SL280 Field Wiring Applications With Conventional Thermostat (Continued) DIP Switch Settings and On-Board Links (figure 4) DIP Switch 1 Wiring Connections Thermostat On Board Links Must Be Cut To Select Thermostat Heating System Options Stages Dual Fuel FURNACE HEAT PUMP L7742U TERM.
  • Page 59 IX- Program Unit Capacity Size Modes 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 60 X- 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 INDOOR WATCHGUARD − AFTER HEAT FAN LIMIT SWITCH CODE CLOSED WITHIN 3...
  • Page 61 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? EXPIRED? ONLY FOR 1ST REQUEST FOR 2ND STAGE HEAT INDUCER SWITCHED TO HIGH SPEED HIGH...
  • Page 62 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 63 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 64 Troubleshooting: Continuous Fan Sequence of Operation CALL FOR FAN CALL FOR FAN INDOOR BLOWER ON CONTINUOUS FAN SPEED CALL FOR FAN MAINTAIN INDOOR BLOWER AT REMOVED? CONTINUOUS FAN REQUEST MAINTAIN INDOOR FOR COOLING GO TO CALL FOR COOLING BLOWER AT RECEIVED? CONTINUOUS FAN MAINTAIN INDOOR...

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