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Lennox SLP99DFV Series Manual
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Lennox SLP99DFV Series Manual

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S e r v i c e L i t e r a t u r e
SLP99DFV series units are high-efficiency downflow gas
furnaces equipped with variable capacity gas valve, vari-
able speed combustion air inducer and variable speed
indoor blower motor. All models are designed for direct
vent (dual pipe) venting system only. SLP99DFV units are
available in heating capacities from 66,000 to 132,000
Btuh (19.3 to 38.6 kW) and cooling applications from 2 to
5 tons (7.0 kW to 17.5 kW). Refer to Engineering Hand-
book for proper sizing.
Units are factory-equipped for use with natural gas. Kits
are available for conversion to LP operation. SLP99DFV
models include a SureLight
that can be used with a communication thermostat as part
of a communicating comfort system. All SLP99DFV units
meet the California Nitrogen Oxides (NOx) Standards and
California Seasonal Efficiency requirements.
All specifications in this manual are subject to change.
Procedures outlined in this manual are presented as rec-
ommendations 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 con-
stitute code.

TABLE OF CONTENTS

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2
Optional Accessories . . . . . . . . . . . . . . . . . . . . . . Page 3
Blower Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4
I Unit Components . . . . . . . . . . . . . . . . . . . . . . . Page 10
II Communicating Thermostat . . . . . . . . . . . . . . Page 36
III Placement and Installation . . . . . . . . . . . . . .
IV Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 55
V Heating System Service Checks . . . . . . . . . . Page 56
VI Typical Operating Characteristics . . . . . . . .
VII Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . Page 62
VIII Wiring and Sequence of Operation . . . . .
IX Field Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 73
UNIT INFORMATION
UNIT INFORMATION
SLP99DFV SERIES UNITS
variable integrated control
®
Page 39
Page 62
Page 65
100002
10/2021
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional HVAC installer or
equivalent, service agency, or the gas supplier.
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
Electric shock hazard. Can cause injury or
death. Before attempting to perform any
service or maintenance, turn the electrical
power to unit OFF at disconnect switch(es).
Unit may have multiple power supplies.
Page 1
SLP99DFV
WARNING
CAUTION
WARNING
©2016 Lennox Industries, Inc.

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Summary of Contents for Lennox SLP99DFV Series

  • Page 1: Table Of Contents

    S e r v i c e L i t e r a t u r e 10/2021 SLP99DFV SERIES UNITS SLP99DFV series units are high-efficiency downflow gas furnaces equipped with variable capacity gas valve, vari- able speed combustion air inducer and variable speed indoor blower motor.

  • Page 2: Specifications

    S P ECIF ICATIONS Model No. SLP99DF070XV36B SLP99DF090XV36C SLP99DF090XV48C Heating AFUE 97.5% 97.5% 97.5% Performance Maximum Input - Btuh 66,000 88,000 88,000 Output - Btuh 64,000 84,000 85,000 Temperature rise range - °F 50 - 80 60 - 90 50 - 80 Gas Manifold Pressure (in.

  • Page 3: Optional Accessories

    OPT IONAL AC C ESSORIES - ORD ER SEPARAT ELY NOTE - FURNACES CANNOT BE TWINNED! “B” Width Models “C” Width Models CABINET ACCESSORIES Downflow Combustible Flooring Base 11M60 11M61 High Performance Economizer (Commercial Only) 10U53 10U53 CONDENSATE DRAIN KITS Condensate Drain Heat Cable 26K68 26K68...

  • Page 4: Blower Data

    First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan speeds are approximately 28% and 38% (DIP switch selectable) of the same second-stage COOL speed position minimum 250 cfm. Lennox iHarmony Zoning System Applications - Minimum blower speed is 250 cfm.
  • Page 5 First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan speeds are approximately 28% and 38% (DIP switch selectable) of the same second-stage COOL speed position minimum 250 cfm. Lennox iHarmony Zoning System Applications - Minimum blower speed is 250 cfm.
  • Page 6 First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan speeds are approximately 28% and 38% (DIP switch selectable) of the same second-stage COOL speed position minimum 250 cfm. Lennox iHarmony Zoning System Applications - Minimum blower speed is 380 cfm.
  • Page 7 First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan speeds are approximately 28% and 38% (DIP switch selectable) of the same second-stage COOL speed position minimum 250 cfm. Lennox iHarmony Zoning System Applications - Minimum blower speed is 450 cfm.
  • Page 8 First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan speeds are approximately 28% and 38% (DIP switch selectable) of the same second-stage COOL speed position minimum 250 cfm. Lennox iHarmony Zoning System Applications - Minimum blower speed is 450 cfm.
  • Page 9 Parts Arrangement CONTROL BOX (includes variable capacity integrated control, transformer, circuit breaker and door switch) BLOWER ASSEMBLY (Variable Speed Blower Motor Is Hidden) BAG ASSEMBLY BLOWER SIDE VENT ACCESS PATCH PLATE PANEL ACCESS PANEL COMBUSTION AIR INDUCER PRIMARY LIMIT GAS VALVE BURNER BOX ASSEMBLY FIGURE 1 Page 9...

  • Page 10: I Unit Components

    An interlock switch rated 14A at 125VAC is wired in series with line voltage. When the inner blower access panel is 4. Integrated Control (A92) removed the unit will shut down. SLP99DFV units are equipped with the Lennox SureLight ® CONTROL BOX variable-capacity integrated control. This control can be used with a communicating thermostat as part of a com- SURELIGHT®...
  • Page 11 Electronic Ignition Three- Stage Timed Operation Using a single-stage thermostat the system will operate At the beginning of the heat cycle the SureLight integrat- ® in a three stage timed mode. Upon a call for heat and a ed control monitors the low fire combustion air inducer successful ignition, the combustion air inducer will operate pressure switch.
  • Page 12 NEUTRAL TERMINALS COMBUSTION AIR INDUCER CONNECTOR IGNITOR CONNECTOR FLAME SENSE DIAGNOSTIC LINE VOLTAGE PUSH BUTTON TERMINALS DIP SWITCHES ON-BOARD LINKS OUTDOOR AIR INDOOR SENSOR BLOWER TERMINALS 7-SEGMENT CONNECTOR DIAGNOSTIC LED W915 Y1 TO Y2 DISCHARGE AIR SENSOR W951 R TO O TERMINALS W914 R TO DS FACTORY TEST...
  • Page 13 SLP99UHV INTEGRATED CONTROL CONFIGURATION GUIDE FIGURE 5 Page 13...
  • Page 14 TABLE 3 Thermostat Selection Switch Settings Operation Thermostat Switch 1 Switch 2 Switch 3 Variable Capacity Heat (35% to 100%) Two-Stage 2nd stage delay OFF = 7 minutes Three-Stage Heat Single-Stage ON = 12 minutes 3rd stage delay (35%, 70%, 100%) 10 minutes fixed Two-Stage Heat (W1 70%, W2 100%) Two-Stage...
  • Page 15 Switches 10 and 11 -- Cooling Mode Blower Speed Ad- Ramping Option A (Factory Selection) justment -- Switches 10 and 11 are used to select blower • Motor runs at 50% for 30 seconds. speed adjustment settings. The unit is shipped from the •...
  • Page 16 Switches 14 through19 -- Heating Mode Blower Speed TABLE 10 -- Switches 14 through 19 are used to select heating mode High Heat Blower Speeds blower motor speeds. These switches are factory set at Thermostat the OFF position which provides 100 % of normal speed DIP Switch Settings Blower Speed Demand...
  • Page 17 On-Board Link W914 DS to R (FIGURE 4) While in the Field Test mode the technician can: • Initiate furnace ignition and move to and hold low- On-board link W914, is a clippable connection between fire rate by applying a R to W1 jumper. terminals DS and R on the integrated control.
  • Page 18 TABLE 11 Idle Menu Options These options are displayed on the menu when the button is pressed during normal operation DISPLAY ACTION (when button released) No change (idle) remain in idle mode Solid “E” enter diagnostic mode Solid “-” enter field test mode NOTE - No change implies the display will continue to show whatever is currently being displayed for normal operation TABLE 12 Idle Menu Options...
  • Page 19 Configuring Unit Size Codes 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 20 TABLE 14 LED 7 Segment Status / Error Code Press the diagnostic push button and hold it to cycle through a menu of options. Every five seconds a new menu item will be displayed. Release the button when the desired mode is displayed. When a solid ”P”...
  • Page 21 Integrated Control Diagnostic Codes (Continued) Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E200 Hard lockout - Rollout circuit open or previously Correct unit cause of rollout trip or replace flame rollout switch and test furnace open. operation.
  • Page 22 Integrated Control Diagnostic Codes (Continued) Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E274 Soft lockout - Exceeded maximum number of See E 250. recycles. Last recycle failed due to the limit circuit opening or limit remained open longer than 3 minutes.
  • Page 23 Integrated Control Diagnostic Codes (Continued) Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E402 LSOM - Outdoor unit system pressure trip. Compressor ran over 18 hours in air conditioning mode. LSOM - Compressor short-cycling (Running less than Outdoor unit pressure trip.
  • Page 24 TABLE 16 OPERATING SEQUENCE SLP99DFDV and Single-Stage Outdoor Unit OPERATING SYSTEM DEMAND SYSTEM RESPONSE SEQUENCE Demand Relative Humidity Blower System Comments Step Compressor Condition Status (COOL) stage stage NO CALL FOR DEHUMIDIFICATION Normal Operation - Acceptable Compressor and indoor blower follow thermostat Normal Operation - demand Acceptable...
  • Page 25 B-Blower Compartment (FIGURE 7) BLOWER MOTOR COMPONENTS STATOR (WINDINGS) BEARING ROTOR FIGURE 8 To Remove Blower From Unit: 1. Disconnect Power, 2. Remove access panels. 3. Remove A solid-state controller is permanently attached to the mo- Control Box 4. Remove Bolts. 5. Unplug Motor Wires From tor.
  • Page 26 Motor Start-Up BLOWER B3 HARNESS CONNECTORS When B3 begins start-up, the motor gently vibrates back and forth for a moment. This is normal. During this time P48 5 Pin the electronic controller is determining the exact position SHAFT of the rotor. Once the motor begins turning, the controller slowly eases the motor up to speed (this is called “soft- start”).
  • Page 27 Troubleshooting Motor Operation (FIGURE 10) BLOWER B3 HARNESS CONNECTORS To verify motor operation see steps below: P48 5 Pin 1 - Remove J48 (5 pin power plug) from P48 on the P49 4 Pin motor. SHAFT 2 - With the power on at the furnace and door switch depressed, use a test meter to verify 120V between pins 4 and 5 on J48.
  • Page 28 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, NOTE - If your ohm meter is not an auto-ranging type, set replace the motor and control module.
  • Page 29 C-Heating Components (FIGURE 14) When S47 senses rollout, the circuit breaks and the inte- grated control immediately stops ignition and closes the 1. Ignitor gas valve. If unit is running and flame rollout is detected, The SureLight ignitor is made of durable silicon nitride. the gas valve will close and integrated control will be dis- ®...
  • Page 30 Burner Box Assembly burner assembly intake air collar rollout switch flame sensor Cover plate (-090XV60C model only) ignitor burner box front cover (remove screw to open cover) sight glass FIGURE 14 Page 30...
  • Page 31 Inlet and outlet pressure taps are located on the valve. SLP99DFV units located in the heating vestibule panel. LPG change over kits are available from Lennox. Kits in- When excess heat is sensed in the heat exchanger, the clude burner orifices and an LP gas valve.
  • Page 32 8. Combustion Air Inducer (B6) & Pressure Switch WARNING (S18) The pressure switch is a safety shut-down control All SLP99UHV units are equipped with a combustion air in the furnace and must not be jumpered for any inducer (B6) and dual pressure switch assembly (high fire reason other than troubleshooting.
  • Page 33 Checks of pressure differential can aid in troubleshooting. state and go straight into ignitor warm up Lennox provides a kit (10L34) if necessary. When measur- ing the pressure differential, readings should be taken at After calibration, the integrated control stores the RPM1 the pressure switch.
  • Page 34 Measuring Pressure Differential BLACK TUBING POSITIVE To Cold End Header Box Field Installed RED and BLACK TUBING or RED TUBING NEGATIVE Measuring Device Operate unit and observe measuring device reading. Remove thermostat demand and allow unit to cycle off. Readings will change as heat exchanger warms. Install a tee in the negative (-) line (red and black tubing or red a.
  • Page 35 Combustion Air Inducer / Cold End Header Box / Vent Pipe Assembly Intake Air Pipe Exhaust Pipe Cold End Header Box Pipe Clamp Exhaust Connector Blower Deck Seal with Alignment Tabs Exhaust Coupling Drain Cap Exhaust Elbow Tubing Combustion Air Inducer (CAI) Clamp Intake Air Coupling CAI Embossment...

  • Page 36: Communicating Thermostat

    II-Communicating Thermostat (if applicable) In communicating applications a communicating thermostatmust be used. In these applications the thermostat overrides the DIP switch settings on the integrated control. Refer to the illustrations provided with the thermostat for installation, set-up and operation. See FIGURE 20, FIGURE 21 and FIGURE 22 for thermostat wiring in communicating applications. Communicating Enabled Furnace and Communicating Enabled Furnace and Non-Communicating Outdoor Unit...
  • Page 37 Optional Accessories for use with any Communicating System NOTE: ICOMMUNICATING THERMOSTAT SENSES HUMIDITY & CONTROLS HUM CONTACTS TO CYCLE HUMIDIFIER BASED 120V CONNECTIONS “HUM” CONTACT IS QUIRED. CLOSED ANYTIME HUMIDITY DEMAND IS PRESENT TIONS. BUILT INTO ALL COMMUNICATING ENABLED OUT DOOR UNITS).
  • Page 38 LENNOX COMMUNICATING OUTDOOR UNIT INDOOR UNIT (1 OR 2 STAGE) FLOAT SWITCH LENNOX COMMUNICATING OUTDOOR UNIT LENNOX COMMUNICATING FURNACE EL296V, SL280V, SL280VN, SL297V, SLP99V cutting DS to R will not cause communication interuption or error code CUT* R-DS W914 FIGURE 22...
  • Page 39 III-PLACEMENT AND INSTALLATION CAUTION All pipe, fittings, primer and solvent cement must conform Solvent cements for plastic pipe are flammable with American National Standard Institute and the Ameri- liquids and should be kept away from all sources of can Society for Testing and Materials (ANSI/ASTM) stan- ignition.
  • Page 40 TABLE 22 OUTDOOR TERMINATION USAGE* STANDARD CONCENTRIC Wall Kit 1-1.2 inch 2 inch 3 inch Flush Mount Vent Pipe 2 inch 3 inch Input Size Field 71M80 (US) 69M29 (US) 60L46 (US) Dia. in. 51W11 (US) Fabricated 44W92 44W92 44W93 22G44 (US) 44J40 (US) 51W12...
  • Page 41 REPLACING FURNACE THAT WAS PART OF A COMMON VENT SYSTEM Vent Piping Guidelines NOTE - Lennox has approved the use of DuraVent ® CHIMNEY Centrotherm manufactured vent pipe and terminations as OR GAS VENT an option to PVC.
  • Page 42 TABLE 23 Flue Coupling To Exhaust Coupling MINIMUM VENT PIPE LENGTHS SLP99UHV MIN.EQUIV. VENT EXAMPLE MODEL LENGTH Exhaust Pipe 5 ft. plus 2 elbows of Flue Couplig 1-/12”, 2”, 2-1/2” or Top Band (torque to 40in-lbs) 3” diameter pipe 15 ft* Furnace 5 ft.
  • Page 43 TABLE 24 Maximum Allowable Intake or Exhaust Vent Length in Feet *Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size. NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation. Standard Termination at Elevation 0 - 4500’...
  • Page 44 TABLE 25 Maximum Allowable Intake or Exhaust Vent Length in Feet *Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size. Concentric Termination at Elevation 0 - 4500’ Number 1-1/2”...
  • Page 45 TYPICAL EXHAUST PIPE CONNECTIONS 070 Only 2” 1−1/2” 2” 2” 2” TRANSITION 2” 2” Exhaust Exhaust 3” DO NOT transition from larger to smaller pipe in horizontal runs TRANSITION of exhaust pipe. INTAKE EXHAUST DO NOT transition from smaller *2” to larger pipe size in horizontal TOP VIEW runs of exhaust pipe.
  • Page 46 ‡ Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor. Lennox recommends avoiding this location if possible. FIGURE 29 Page 46...
  • Page 47 General Guidelines for Vent Terminations NOTE - See TABLE 26 for maximum allowed exhaust pipe length without insulation in unconditioned space during In Direct Vent applications, combustion air is taken from winter design temperatures below 32°F (0°C). If required outdoors and the flue gases are discharged to the out- exhaust pipe should be insulated with 1/2”...
  • Page 48 Conditioned Space Exhaust Pipe Pipe Insulation Intake Conditioned Pipe Unconditioned Space Space FIGURE 30 NOTE - When venting in different pressure zones, Details of Intake and Exhaust Piping Terminations for the maximum separation requirement of intake and Direct Vent Installations exhaust pipe DOES NOT apply.
  • Page 49 Exiting Exhaust and Intake Vent 3”(76mm) MAX. Inches(mm) SIZE TERMINATION (different pressure zone) PIPE PER TABLE 7. UNCONDITIONED Roof T erminated ATTIC SPACE 8” (203mm) MIN Exhaust Pipe 12” (305mm) ABOVE AVERAGE SNOW ACCUMULATION Inlet Air (Minimum 12 in. Furnace 305 MM) above 3”...
  • Page 50 FIELD FABRICATED WALL TERMINATION NOTE − FIELD−PROVIDED REDUCER MAY BE 2” (51mm) 3” (76mm) REQUIRED TO ADAPT Vent Pipe Vent Pipe LARGER VENT PIPE SIZE TO TERMINATION A− Minimum clearance above grade or average 12” (305 mm) 12” (305 mm) snow accumulation B−...
  • Page 51 Accelerator not required for 3” concentric FIELD-PROVIDED Accelerator not required REDUCER MAY BE for 3” concentric REQUIRED TO ADAPT DIFFERENT VENT PIPE FLASHING 12” (305mm) OUTSIDE SIZE TO TERMINATION (Not Furnished) INTAKE INTAKE WALL Minimum Above Average EXHAUST Snow EXHAUST Accumulation SHEET METAL STRAP 12”...
  • Page 52 Heat cable kit is available length of PVC pipe required to reach available drain from Lennox in various lengths; 6 ft. (1.8m) - kit no. 26K68 and 24 ft. (7.3m) - kit no. 26K69. Page 52...
  • Page 53 CONDENSATE TRAP LOCATION Furnace with Evaporator (shown with right side exit of condensation) Coil Using a Common Drain Field Provided Vent 1” min. 2” max. above Trap can be installed a maximum condensate drain. of 5ft. from furnace (*PVC only) Field Provided Vent Condensate 1”...
  • Page 54 TRAP / DRAIN ASSEMBLY USING 1/2” PVC OR 3/4” PVC Optional Condensate Drain Connection Adapter 3/4 inch slip X 3/4 inch mpt (not furnished) 90° Street Elbow 3/4 inch PVC (not furnished) Adapter 3/4 inch slip X 3/4 inch mpt (not furnished) Condensate Drain Connection In Unit 1 (25 mm) Min.

  • Page 55: Start Up

    IV-START-UP BEFORE PLACING THE UNIT INTO OPERATION, the unit, smell all around the furnace area for gas. Be sure to A-Preliminary and Seasonal Checks smell next to the floor because some gas is heavier than air and will settle on the floor. 1 - Inspect electrical wiring, both field and factory installed for loose connections.

  • Page 56: Heating System Service Checks

    Gas Leak Detector is strongly recommended. It Turn off thermostat or set to “UNOCCUPIED” mode. Close is available through Lennox under part number 31B2001. all gas valves (both internal and external to unit) to guar- See Corp. 8411-L10, for further details.
  • Page 57 Use pressure test 4 - After allowing unit to stabilize for 5 minutes, record adapter kit (available as Lennox part 10L34) to assist in operating pressure signal and compare to value measurement.
  • Page 58 MANIFOLD PRESSURE MEASUREMENT Gas Valve Field Installed FIGURE 49 Negative Port Operating Signal (Delta P) Measurement Positive Port Red and Black Tubing - Black Tubing + Gas Valve Field Installed Measuring Device FIGURE 50 Page 58...
  • Page 59 G- Proper Combustion H- High Altitude Furnace should operate minimum 15 minutes with correct NOTE - In Canada, certification for installations at eleva- manifold pressure and gas flow rate before checking com- tions over 4500 feet (1372 m) is the jurisdiction of local bustion.
  • Page 60 I- Proper Ground and Voltage 2 - In addition, measure the AC voltage from Line Hot to Line Neutral (spade terminals) on the integrated A poorly grounded furnace can contribute to premature control. See FIGURE 51. This voltage should be in ignitor failure.
  • Page 61 J-Discharge Air Temperature Sensor (DATS) Type 2 Units may have a discharge air temperature sensor locat- ed in the supply duct or in the coil. Two type sensors are used. FIGURE 52 (located in the coil) and FIGURE 54 (located in the plenum). If the sensor is suspect, check the location using TABLE 35 and FIGURE 53 (type 1) or TABLE 36 and FIGURE 55 (type 2).
  • Page 62 VI-TYPICAL OPERATING CHARACTERISTICS TEMPERATURE RISE Supply Duct Temperature A-Blower Operation and Adjustment Return Duct Temperature Temperature Rise = 1 - Blower operation is dependent on thermostat control system. Return 2 - Generally, blower operation is set at thermostat subbase fan switch. With fan switch in ON position, blower operates continuously.
  • Page 63 Before using any filter with this system, check the specifications provided by the filter manufacturer 3 - Inspect screen and rinse with tap water if needed. against the data given in the appropriate Lennox 4 - Reinstall screen and turn on power to unit. Product Specifications bulletin.
  • Page 64 11 - Mark and disconnect all combustion air pressure 36 - Reconnect flame roll-out switch wires. tubing from cold end header collector box. 37 - Reconnect sensor wire and reconnect 2-pin plug 12 - Mark and remove wires from pressure switches. from ignitor.
  • Page 65 VIII- Wiring and Sequence of Operation 3 - After the pre-purge is complete, a 20-second initial NOTE - The thermostat selection DIP switch on the con- ignitor warm-up period begins. The combustion air trol is factory-set in the “TWO-STAGE” position. inducer continues to operate at the ignition speed.
  • Page 66 5 - If second-stage heat is required, the thermostat is adjusted to a speed which is appropriate for the second- stage heat contacts close and send a signal target rate. to the integrated control. The integrated control 7 - When the thermostat heating demand is satisfied, either increases the firing rate to 70 percent (if the the gas valve is de-energized and the combustion current rate is at or below 60 percent) or increases...
  • Page 67 A - Sequence of Operation and Troubleshooting Flow Chart IGNITION AND CALL FOR LOW FIRE WITH TWO-STAGE THERMOSTAT Safety Check Verify There Is No Main Burner Flame After Indoor blower OFF Heat OFF Delay (Low Heat Speed) Limit Combustion Air Limit Indoor Blower De-Energize...
  • Page 68 CALL FOR HIGH FIRE WITH TWO-STAGE THERMOSTAT 2 Stage Thermostat 1st Call for High Fire? 2nd Stage Recognition Delay (30 Seconds) Combustion Air Inducer ON (100% Rate Speed) High Pressure Switch Increase Combustion Error Code Wait 5 Closes Within Air Inducer Speed Flashes Minutes 10 Seconds?
  • Page 69 CALL FOR HEAT SATISFIED RUN MODE (2 STAGE THEREMOSTAT) RUN MODE (SINGLE STAGE THERMOSTAT) 1ST OR 2ND STAGE CALL FOR HEAT ALL ALL INPUTS MONITORED (LIMIT, PRESSURE, INPUTS MONITORED (LIMIT, PRESSURE, CALL FOR HEAT / COOL, FLAME LEVEL) CALL FOR HEAT / COOL, FLAME LEVEL) 2nd Stage Heat 2nd Stage Call for Heat...
  • Page 70 IGNITION AND CALL FOR HEAT WITH SINGLE-STAGE THERMOSTAT Safety Check Verify There Is No Main Burner Flame Indoor Blower OFF After Heat OFF Delay (Low Heat Speed) Indoor Blower Limit Limit De-Energize Combustion Air Error Code Switch Closes Within 3 Gas Valve Flashes Inducer ON...
  • Page 71 CALL FOR COOLING 1st Stage Cooling Request Received Energize 1st Stage Cooling Contactor (Compressor & Fan) Indoor Blower On After 2-second delay Energize Indoor Blower (Per Ramping Profile) 1st Stage 2nd Stage Cooling Request Cooling Still Active? Request? Energize 2nd Stage Energize Indoor Blower Cooling Contactor (High Cooling mode)
  • Page 72 CONTINUOUS LOW SPEED INDOOR BLOWER SEQUENCE OF OPERATION Call for Continuous Blower Indoor Blower On (Speed Determined by Dip Switch settings) Request Maintain Indoor for Cooling Go to Call for Cooling Blower at set speed Received? Go to Call for Heat -- Two-Stage Thermostat Request Maintain Indoor for Heat...

  • Page 73: Field Wiring

    IX- Field Wiring For Non-Communicating Thermostats DIP Switch Settings and On-Board Links W914 W915 (DS to R) W951 (Y1 to Y2) Thermostat Wiring Connections DIP Switch 1 (O to R) Two-Stage cation or Heat Pumps Cooling Harmony 1Heat / 1 Cool Intact Intact Intact...
  • Page 74 DIP Switch Settings and On-Board Links W914 W915 (DS to R) (Y1 to Y2) W951 Thermostat Wiring Connections Two-Stage DIP Switch 1 (O to R) cation or Cooling Heat Pumps Harmony 2 Heat / 2 Cool Intact Intact CONTROL OUTDOOR T'STAT TERM.
  • Page 75 DIP Switch Settings and On-Board Links W914 W915 (DS to R) W951 (Y1 to Y2) Wiring Connections Thermostat DIP Switch (O to R) Two-Stage cation or Heat Pumps Cooling Harmony Dual Fuel DIP Switch 1 Intact Intact CONTROL HEAT PUMP L7742U TERM.

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Slp99df070xv36bSlp99df090xv36cSlp99df090xv48cSlp99df090xv60cSlp99df110xv60c