Lennox SLP99DF070XV36B Unit Information
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Lennox SLP99DF070XV36B Unit Information

Lennox SLP99DF070XV36B Unit Information

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Service Literature
SLP99DFV series units are high-efficiency downflow gas
furnaces equipped with variable capacity gas valve, vari­
able speed combustion air inducer and variable speed in­
door blower motor. All models are designed for direct vent
(dual pipe) venting system only. SLP99DFV units are avail­
able 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 Handbook 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
variable integrated control that can be
used with a communication thermostat as part of a commu­
nicating comfort system. All SLP99DFV units meet the Cali­
fornia Nitrogen Oxides (NO
sonal Efficiency requirements.
All specifications in this manual are subject to change. Pro­
cedures outlined in this manual are presented as recom­
mendations 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

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III Placement and Installation
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VIII Wiring and Sequence of Operation
IX Field Wiring
. . . . . . . . . . . . . . . . . . . . . . . . . . .
SLP99DFV SERIES UNITS
) Standards and California Sea­
x
Page 2
Page 3
Page 4
Page 10
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Page 36
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Page 39
Page 55
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Page 61
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Page 64
Page 72
100002
05/2021
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.
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at discon­
nect switch(es). Unit may have multiple
power supplies.
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.
Page 1
SLP99DFV
WARNING
WARNING
CAUTION
© 2021 Lennox Industries Inc.

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Summary of Contents for Lennox SLP99DF070XV36B

  • Page 1: Table Of Contents

    IX Field Wiring ......Page 72 Page 1 © 2021 Lennox Industries Inc.

  • Page 2: Specifications

    SP ECIFICATIONS 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

    BLO WER DATA SLP99DF070XV36B BLOWER PERFORMANCE (less filter) HEATING BLOWER PERFORMANCE - 0 through 0.8 in. w.g. External Static Pressure Range Heating Input Range and Blower Volume - CFM Heating Adjust CFM Selections 100% Increase (+15%) Heat CFM 1022 1118 Increase (+7.5%) Heat 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 SLP99DFV 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 ACCESS PANEL ACCESS PANEL COMBUSTION AIR INDUCER PRIMARY LIMIT GAS VALVE BURNER BOX ASSEMBLY FIGURE 1 Page 9...

  • Page 10: I Unit Components

    When the inner blower access panel is re­ moved the unit will shut down. 4. Integrated Control (A92) ® SLP99DFV units are equipped with the Lennox SureLight CONTROL BOX SLP99DFV variable-capacity integrated control. This control can be used with a communicating thermostat as part of a commu­...
  • Page 11 Electronic Ignition Three- Stage Timed Operation ® At the beginning of the heat cycle the SureLight integrated Using a single-stage thermostat the system will operate in a control monitors the low fire combustion air inducer pres­ three stage timed mode. Upon a call for heat and a success­ sure 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 SLP99DFV 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 Two-Stage (35% to 100%) Three-Stage Heat Single-Stage 2nd stage delay (35%, 70%, 100%) OFF = 7 minutes ON = 12 minutes 3rd stage delay 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) D Motor runs at 50% for 30 seconds. justment -- Switches 10 and 11 are used to select blower D Motor then runs at 82% for approximately 7-1/2 min­ speed adjustment settings.
  • Page 16 TABLE 9 TABLE 10 Low Heat Blower Speeds High Heat Blower Speeds Blower Blower DIP SWITCH SETTINGS DIP SWITCH SETTINGS Thermostat Speed Thermostat Speed Demand Adjust­ Demand Adjust­ ments ments +15% +15% +7.5% +7.5% High Heat Low Heat (R to Normal Normal (R to W1)
  • Page 17 On-Board Link W914 DS to R (Figure 4) Field Test Mode On-board link W914, is a clippable connection between ter­ Use the diagnostic push button to scroll through the menu as described above. Release the button when the LED minals DS and R on the integrated control. W914 must be flashes “-”...
  • 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 Field Test 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 E 202 Indoor blower motor mis-match - Indoor motor horsepower does not match unit Incorrect furnace size code selected. Check unit size capacity. codes on configuration guide or in installation instructions. E 203 Appliance capacity / size is NOT programmed.
  • Page 22 Integrated Control Diagnostic Codes (continued) Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E 292 Indoor blower motor unable to start - Seized bearings, stuck wheel, etc. Indoor blower motor unable to start (seized bearing, stuck wheel, etc), replace motor or wheel if assembly does not operate or meet performance.
  • Page 23 TABLE 15 OPERATING SEQUENCE SLP99DFV and Single-Stage Outdoor Unit OPERATING SYSTEM DEMAND SYSTEM RESPONSE SEQUENCE Demand Relative Humidity Blower System Step Compressor Comments Condition Status (COOL) stage NO CALL FOR DEHUMIDIFICATION Compressor and indoor Normal Operation Acceptable High 100% blower follow thermostat demand BASIC MODE (only active on a Y1 thermostat demand) Normal Operation...
  • Page 24 TABLE 16 OPERATING SEQUENCE SLP99DFV and Two-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 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 SLP99DFV furnace line.
  • 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 the elec­ P48 5 Pin tronic controller is determining the exact position of the rotor. Once the motor begins turning, the controller slowly eases the SHAFT motor up to speed (this is called “soft‐start”).
  • Page 27 Troubleshooting Motor Operation (figure 10) To verify motor operation see steps below: 1- Remove J48 (5 pin power plug) from P48 on the mo­ BLOWER B3 HARNESS CONNECTORS tor. P48 5 Pin 2- With the power on at the furnace and door switch de­ P49 4 Pin pressed, use a test meter to verify 120V between pins 4 SHAFT...
  • Page 28 Troubleshooting Motor Windings TEST A Measure the resistance between each of the three motor Ensure that motor windings are not damaged by performing leads (3-pin plug) and the unpainted part of the end shield. the following tests: If the winding resistance to ground is <100k ohms, replace the motor and control module.
  • Page 29 C-Heating Components S47 senses rollout, the circuit breaks and the integrated control immediately stops ignition and closes the gas valve. 1. Ignitor (Figure 14) ® If unit is running and flame rollout is detected, the gas valve The SureLight ignitor is made of durable silicon nitride. Ig­ nitor longevity is enhanced by controlling voltage to the igni­...
  • Page 30 Burner Box Assembly Burner Assembly Ignitor Intake Air Collar Rollout Switch Flame Sensor Gas Valve Burner Box Front Cover Sight Glass (remove screw to open cover) FIGURE 14 Page 30...
  • Page 31 Inlet and outlet pressure taps are located on the valve. is sensed in the heat exchanger, the limit will open. Once the LPG change over kits are available from Lennox. Kits include limit opens, the furnace control energizes the supply air burner orifices and an LP gas valve.
  • Page 32 8. Combustion Air Inducer (B6) & Pressure Switch WARNING (S18) All SLP99DFV units are equipped with a combustion air in­ The pressure switch is a safety shut-down control in ducer (B6) and dual pressure switch assembly (high fire and the furnace and must not be jumpered for any rea­ low fire).
  • Page 33 2- Start inducer at a predetermined low RPM (1600). 1- The inducer runs 15 seconds at the last firing rate Wait 7.5 seconds. before the heat call ended. 2- Inducer runs at 35% firing rate RPM (RPM1 + low 3- Check low pressure switch, if open, increase RPM by pressure switch open RPM margin value).
  • 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) illustrations provided with the thermostat for installation, set-up and operation. In communicating applications a communicating must be used. In these applications the thermostat overrides the DIP See figures 20 and 21 for wiring in communicating applica­ switch settings on the integrated control.
  • Page 37 Optional Accessories for use with any Communicating System NOTE: THERMOSTAT SENSES HUMIDITY & CONTROLS 24V “H” OUTPUT (& 120V “H” OUTPUT) TO CYCLE HUMIDIFIER BASED ON DEMAND. NO OTHER CONTROL OR HUMIDISTAT REQUIRED. COMMUNICATING ENABLED FURNACE OPTIONAL OUTDOOR AIR SENSOR FOR USE WITH HUMID­ IFIER (IF NOT ALREADY IN THE SYSTEM FOR OTHER FUNCTIONS.
  • 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 Pipe & Fittings Specifications Solvent cements for plastic pipe are flammable liq­ All pipe, fittings, primer and solvent cement must conform uids and should be kept away from all sources of igni­ with American National Standard Institute and the Ameri­ tion.
  • Page 40 TABLE 22 OUTDOOR TERMINATION KITS USAGE* STANDARD KITS CONCENTRIC KITS Flush­ Wall Kit Wall Ring Kit Mount 1-1/2 inch 2 inch 3 inch Vent 2 inch 3 inch 2 inch Pipe Input Size Field Dia. in. 51W11 71M80 69M29 Fabricated 44J40 (US) 22G44 (US)
  • Page 41 Vent Piping Guidelines FIGURE 23 ® NOTE - Lennox has approved the use of DuraVent Centrotherm manufactured vent pipe and terminations as ® an option to PVC. When using the PolyPro by DuraVent or ®...
  • Page 42 TABLE 23 Flue Coupling To Exhaust Coupling MINIMUM VENT PIPE LENGTHS SLP99DF MIN. EQUIV. Exhaust Pipe EXAMPLE VENT LENGTH MODEL 5 ft. plus 2 elbows of 1-1/2”, 2”, 15 ft.* 2-1/2” or 3” diameter pipe Top Band Flue Coupling (torque to 40in−lbs) 5 ft.
  • Page 43 TABLE 24 Maximum Allowable Intake or Exhaust Vent Length in Feet NOTE - 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.
  • 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”Pipe 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 DO NOT transition from smaller EXHAUST *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 exhaust pipe should be insulated with 1/2” (13mm) Arma­ flex or equivalent. In extreme cold climate areas, 3/4” In Direct Vent applications, combustion air is taken from (19mm) Armaflex or equivalent may be necessary. Insula­ outdoors and the flue gases are discharged to the out­...
  • Page 48 Conditioned Space Exhaust Pipe Pipe Insulation Intake Conditioned Pipe Unconditioned Space Space FIGURE 30 Details of Intake and Exhaust Piping Terminations for NOTE - When venting in different pressure zones, the maximum separation requirement of intake and ex­ Direct Vent Installations haust pipe DOES NOT apply.
  • Page 49 6. On field-supplied terminations, a minimum distance Exiting Exhaust and Intake Vent between the end of the exhaust pipe and the end of the (different pressure zones) intake pipe without a termination elbow is 8” and a minimum distance of 6” with a termination elbow. See Roof T erminated figure 34.
  • Page 50 FIELD FABRICATED WALL TERMINATION NOTE − FIELD−PROVIDED REDUCER MAY BE 2” (51mm) 3” (76mm) REQUIRED TO ADAPT LARGER VENT PIPE SIZE Vent Pipe Vent Pipe TO TERMINATION A− Minimum clearance above grade or average 12” (305 mm) 12” (305 mm) snow accumulation B−...
  • Page 51 1-1/2” (38mm) accelerator 1-1/2” (38mm) accelerator FIELD-PROVIDED provided on 71M80 & provided on 71M80 & REDUCER MAY BE REQUIRED 44W92 kits for TO ADAPT DIFFERENT VENT 44W92 kits for PIPE SIZE TO TERMINATION. SL98DF070V36B SLP99DFV-36B-070 INTAKE OUTSIDE FLASHING 12” (305mm) INTAKE WALL (Not Furnished)

  • Page 52: Start Up

    Heat cable kit is avail­ unit, location of trap, field-provided fittings and length of able from Lennox in various lengths; 6 ft. (1.8m) - kit no. PVC pipe required to reach available drain. 26K68 and 24 ft. (7.3m) - kit no. 26K69.
  • Page 53 CONDENSATE TRAP LOCATION SLP99DFV 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 Drain 1”...
  • Page 54 TRAP / DRAIN ASSEMBLY USING 1/2” PVC OR 3/4” PVC COLD END HEADER BOX WITH 3/4” DRAIN CONNECTION 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...
  • Page 55 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 1 - Inspect electrical wiring, both field and factory installed for air and will settle on the floor.

  • Page 56: Heating System Service Checks

    Gas Leak Detector is strongly recommended. It is available tee no gas leak into combustion chamber. Turn off power to through Lennox under part number 31B2001. See Corp. unit. All access panels and covers must be in place and se­...
  • Page 57 “+”. tive burner box must be considered. Use pressure test 3 - Start unit on low heat (35% rate) and allow 5 minutes adapter kit (available as Lennox part 10L34) to assist in for unit to reach steady state. measurement.
  • Page 58 Operating Signal (Delta P) Measurement Negative Port Positive Port Red and Black Tubing or Red Tubing - Black Tubing + Gas Valve Field Installed Measuring Device FIGURE 50 F-Discharge Air Temperature Sensor Sensor Type 1 TABLE 30 Unit “a” “b” Units may have a discharge air temperature sensor located in the supply duct or the coil cabinet.
  • Page 59 Sensor Type 2 TABLE 31 G- Proper Combustion Furnace should operate minimum 15 minutes with correct Unit “a” “b” manifold pressure and gas flow rate before checking com­ 070V36B bustion. Take combustion sample beyond the flue outlet and compare to the tables below. 090V36C 090V48C 6”...
  • Page 60 I- Proper Ground and Voltage ings exceed the maximum shown in table 1, make re­ pairs before operating the furnace. A poorly grounded furnace can contribute to premature igni­ 2 - In addition, measure the AC voltage from Line Hot to tor failure.

  • Page 61: Typical Operating Characteristics

    3 - With only the blower motor running and the evaporator specifications provided by the filter manufacturer coil dry, observe the manometer reading. Adjust blower against the data given in the appropriate Lennox motor speed to deliver the air desired according to the Product Specifications bulletin. Additional informa­...
  • Page 62 NOTE - After any heavy snow, ice or frozen fog event the Cleaning Heat Exchanger furnace vent pipes may become restricted. Always check If cleaning the heat exchanger becomes necessary, follow the vent system and remove any snow or ice that may be the below procedures and refer to figure 1 when disassem­...
  • Page 63 22 - Reinstall heat exchanger into cabinet making sure that 42 - Replace the blower compartment access panel. the clamshells of the heat exchanger assembly are 43 - Refer to instruction on verifying gas and electrical con­ resting on the support located at the rear of the cabinet. nections when re-establishing supplies.
  • Page 64 VIII- Wiring and Sequence of Operation NOTE - The thermostat selection DIP switch on the control is 2. Once the control receives a signal that the low-fire factory-set in the “TWO-STAGE” position. pressure switch has closed, the combustion air inducer begins a 15-second pre-purge in ignition speed.
  • Page 65 appropriate target rate. If the furnace is operating in the 5 - If the heating demand continues beyond the second- stage on delay, the integrated control energizes the initial heating cycle after power-up, the initial firing rate combustion air inducer at 70 percent speed. The in­ will be approximately 35 percent.
  • Page 66 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 De−Energize Error Code...
  • Page 67 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 68 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 69 IGNITION AND CALL FOR LOW FIRE 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 Error Code Combustion Air Switch Closes Within 3 Gas Valve Flashes Inducer ON...
  • Page 70 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 71 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 − 2 Stage Thermostat Request Maintain Indoor for Heat...
  • Page 72 IX- Field Wiring TABLE 37 Field Wiring for Non-Communicating Thermostat Applications DIP Switch Settings and On-Board Links (figure 4) W915 W914 (Y1 to Y2) (DS to R) W951 Thermostat Wiring Connections DIP Switch 1 Two-Stage Dehumidifi­ (O to R) Cooling cation or Heat Pumps Harmony IIIt...
  • Page 73 TABLE 44 Field Wiring for Non-Communicating Thermostat Applications DIP Switch Settings and On-Board Links (figure 4) W914 W915 (DS to R) (Y1 to Y2) W951 Dehumidifi­ Thermostat Wiring Connections Two-Stage DIP Switch 1 (O to R) cation or Cooling Heat Pumps Harmony IIIt 2 Heat / 2 Cool...
  • Page 74 TABLE 37 Field Wiring for Non-Communicating Thermostat Applications (Continued) DIP Switch Settings and On-Board Link (figure 4) W914 W915 (DS to R) W951 (Y1 to Y2) Dehumidifi­ Wiring Connections Thermostat DIP Switch (O to R) Two-Stage cation or Heat Pumps Cooling Harmony IIIt...

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