Lennox SLP98UHV SERIES Unit Information
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Lennox SLP98UHV SERIES Unit Information

Slp98uhv series
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See also: User's Information Manual , User Manual
Service Literature
SLP98UHV series units are high−efficiency upflow, horizon-
tal right and left) gas furnaces equipped with variable ca-
pacity gas valve, variable speed combustion air inducer and
variable speed indoor blower motor. All models are de-
signed only for direct vent (dual pipe) venting system.
SLP98UHV units are available in heating capacities from
66,000 to 132,000 Btuh (19.3 to 38.6 kW) and cooling ap-
plications from 2 to 5 tons (7.0 kW to 17.5 kW). Refer to En-
gineering Handbook for proper sizing.
Units are factory−equipped for use with natural gas. Kits are
available for conversion to LPG operation. SLP98UHV mod-
®
els include a SureLight
Variable Capacity integrated control
that can be used with Lennox icomfort Toucht thermostat as
part of a communicating comfort system. All SLP98UHV
units meet the California Nitrogen Oxides (NO
and California Seasonal 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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II Icomfort Toucht Thermostat
III Placement and Installation
IV Start Up
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V Heating System Service Checks
VI Typical Operating Characteristics
VII Maintenance
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VIII Wiring and Sequence of Operation
XI Field Wiring
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Corp. 1029−L7
SLP98UHV SERIES UNITS
) Standards
x
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Page 1
SLP98UHV
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.
WARNING
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.
WARNING
Sharp edges.
Be careful when servicing unit to avoid sharp edges
which may result in personal injury.
© 2010 Lennox Industries Inc.

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Summary of Contents for Lennox SLP98UHV SERIES

  • Page 1 LPG operation. SLP98UHV mod- ® els include a SureLight variable capacity integrated control that can be used with Lennox icomfort Toucht thermostat as part of a communicating comfort system. All SLP98UHV units meet the California Nitrogen Oxides (NO ) Standards and California Seasonal Efficiency requirements.

  • Page 2: Specifications

    SPECIFICATIONS Model No. SLP98UH070V36B SLP98UH090V36C SLP98UH090V48C Heating AFUE 97.0% 98.0% 97.5% Performance Maximum Input - Btuh 66,000 88,000 88,000 Output - Btuh 64,000 85,000 85,000 Temperature rise range - °F 50 - 80 60 - 90 50 - 80 Gas Manifold Pressure (in. w.g.) 3.5 / 10.0 3.5 / 10.0 3.5 / 10.0...
  • Page 3 OPTIONAL ACCESSORIES - MUST BE ORDERED EXTRA “B” Width “C” Width “D” Width Models Models Models CABINET ACCESSORIES Horizontal Suspension Kit - Horizontal only 51W10 51W10 51W10 Return Air Base - Upflow only 50W98 50W99 51W00 CONDENSATE DRAIN KITS Condensate Drain Heat Cable 6 ft.

  • 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%, 38%, 70% and 100% (DIP switch selectable) of the same second-stage COOL speed position minimum 300 cfm. Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 250 cfm. Page 4...
  • 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%, 38%, 70% and 100% (DIP switch selectable) of the same second-stage COOL speed position minimum 300 cfm. Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 250 cfm. Page 5...
  • 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%, 38%, 70% and 100% (DIP switch selectable) of the same second-stage COOL speed position minimum 300 cfm. Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 250 cfm. Page 6...
  • 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%, 38%, 70% and 100% (DIP switch selectable) of the same second-stage COOL speed position minimum 300 cfm. Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 380 cfm. Page 7...
  • Page 8 Continuous Fan speeds are approximately 28%, 38%, 70% and 100% (DIP switch selectable) of the same second-stage COOL speed position minimum 300 cfm. Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 380 cfm (SLP98UH090V48C) and 450 cfm (SLP98UH090V60C). Page 8...
  • Page 9 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%, 38%, 70% and 100% (DIP switch selectable) of the same second-stage COOL speed position minimum 300 cfm. Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 450 cfm. Page 9...
  • Page 10 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%, 38%, 70% and 100% (DIP switch selectable) of the same second-stage COOL speed position minimum 300 cfm. Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 450 cfm. Page 10...
  • Page 11 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%, 38%, 70% and 100% (DIP switch selectable) of the same second-stage COOL speed position minimum 300 cfm. Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 450 cfm. Page 11...
  • Page 12 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%, 38%, 70% and 100% (DIP switch selectable) of the same second-stage COOL speed position minimum 300 cfm. Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 450 cfm. Page 12...
  • Page 13 SLP98UHV PARTS ARRANGEMENT BURNER BOX ASSEMBLY PRESSURE SWITCHES HEAT EXCHANGER VARIABLE CAPACITY PRIMARY LIMIT GAS VALVE VARIABLE SPEED COMBUSTION AIR INDUCER BAG ASSEMBLIES (shipping location) COLD END HEADER ACCESS PANEL VARIABLE SPEED BLOWER MOTOR SIGHT GLASS INNER BLOWER ACCESS PANEL CONTROL BOX (includes variable capacity integrated control transformer circuit breaker and door switch)
  • Page 14 Transformers on all mod- 4. Integrated Control (A92) els are rated 40VA with a 120V primary and a 24V secon- ® SLP98UHV units are equipped with the Lennox SureLight dary. variable−capacity integrated control. This control can be 2. Interlock Switch (S51)
  • Page 15 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 16 NEUTRAL TERMINALS COMBUSTION AIR INDUCER CONNECTOR IGNITOR FLAME CONNECTOR 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 17 SLP98UHV INTEGRATED CONTROL CONFIGURATION GUIDE FIGURE 5 Page 17...
  • Page 18 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 19 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 20 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 21 On−Board Link W914 DS to R (Figure 4) Error Code Recall Mode Select "E" from the menu to access the most recent 10 error On−board link W914, is a clippable connection between ter- codes. Select c" from the Error Code Recall menu to clear minals DS and R on the integrated control.
  • Page 22 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 −...

  • Page 23: Configuring Unit Size Codes

    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 24: Integrated Control Diagnostic Codes

    TABLE 14 LED 7 Segment Status / Error Code Integrated Control Diagnostic Codes 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 25 Integrated Control Diagnostic Codes (continued) Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E 223 Low pressure switch failed open − Refer to troubleshooting in installation instruc- Check inches of water column pressure during operation tion. of low pressure switch on heat call, measure inches of water column of operating pressure, inspect vent and com- bustion air inducer for correct operation and restriction.
  • Page 26 Integrated Control Diagnostic Codes (continued) Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E 295 Indoor blower motor temperature is too high. Indoor blower motor over temperature (motor tripped on internal protector), Check motor bear- ings, amperes. Replace if necessary. E 310 Discharge error sensor failure −...
  • Page 27 TABLE 15 OPERATING SEQUENCE SLP98UHV 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 blower follow thermostat Normal Operation Acceptable High 100% demand...
  • Page 28 TABLE 16 OPERATING SEQUENCE SLP98UHV and Two−Stage Outdoor Unit OPERATING SYSTEM DEMAND SYSTEM RESPONSE SEQUENCE Demand Relative Humidity Blower System Step Compressor Comments Condition Status (COOL) stage stage NO CALL FOR DEHUMIDIFICATION Normal Operation − Acceptable Compressor and indoor blower follow thermostat Normal Operation −...
  • Page 29 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 SLP98UHV furnace line.
  • Page 30 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- tronic controller is determining the exact position of the rotor. P48 5 Pin Once the motor begins turning, the controller slowly eases the SHAFT motor up to speed (this is called soft-start").
  • Page 31 Troubleshooting To verify motor operation see steps below: BLOWER B3 HARNESS CONNECTORS 1− Remove J48 (5 pin power plug) from P48 on the mo- 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 32 3. Flame Rollout Switches (Figure 11) Burners can be removed as a one piece assembly for service. Flame rollout switch S47 is a high temperature limit located If burner assembly has been removed, it is critical to align cen- inside the burner box. Each furnace is equipped with two ter of each burner to the center of the clamshell when re−instal- identical switches.
  • Page 33 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 34 8. Combustion Air Inducer (B6) & Pressure Switch WARNING (S18) All SLP98UHV units are equipped with a combustion air in- The pressure switch is a safety shut−down control ducer (B6) and dual pressure switch assembly (high fire and in the furnace and must not be jumpered for any low fire).
  • Page 35 Vent Calibration After calibration, the integrated control stores the RPM1 and RPM2 values. The low fire (35%) and high fire (100%) The vent calibration sequence establishes furnace operat- RPM points are calculated by adding margin values to the ing parameters in a specific installation. The integrated con- RPM1 and RPM2 values.
  • Page 36 Measuring Pressure Differential RED TUBING NEGATIVE BLACK TUBING POSITIVE 4 − Operate unit and observe manometer reading. 1 − Remove thermostat demand and allow unit to cycle off. Readings will change as heat exchanger warms. 2 − Install a tee in the negative (−) line (red tubing) and a tee in the a.
  • Page 37 Refer to the illustrations pro- vided with the thermostat for installation, set−up and opera- tion. In communicating applications the Lennox icomfort See figures 16 and 17 for icomfort Toucht thermostat wir- Toucht thermostat must be used. In these applications the icomfort Toucht thermostat overrides the DIP switch set- ing in communicating applications.
  • Page 38 Optional Accessories for use with any icomfortt System Optional Accessories for use with any icomfort Toucht System icomfortt− NOTE: icomfortt THERMOSTAT SENSES HUMIDITY & CONTROLS ENABLED 24V H" OUTPUT (& 120V H" OUTPUT) TO CYCLE HUMIDIFIER SLP98UHV BASED ON DEMAND. NO OTHER CONTROL OR HUMIDISTAT FURNACE REQUIRED.
  • 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: Joint Cementing Procedure

    TABLE 21 OUTDOOR TERMINATION KITS USAGE STANDARD CONCENTRIC Outdoor Ex- Outdoor Ex- Flush- 1−1/2" haust Accel- haust Accel- 2" Wall Plate 3" Wall Plate 2" Wall 2" Con- 3" Con- VENT erator erator Mount Concentric Ring Kit centric Kit centric Kit SLP98UH PIPE (Dia.

  • Page 41: Venting Practices

    Without the heat of the original furnace flue products, the existing vent pipe is probably oversized for Contact Lennox’ Application Department for assistance in the single water heater or other appliance. The vent sizing vent pipe in these applications.
  • Page 42 Exhaust Pipe 070, 090, 110 12" Min. or 135 btuh Furnace capacity? 12" max of straight pipe Standard or Which termination? Concentric? Horizontal Application Horizontal Application See table NOTE − All horizontal runs of exhaust pipe must slope back to- ward unit.
  • Page 43 TABLE 23 Maximum Allowable Vent Length in Feet Standard Termination at Elevation 0 − 7500’ Pipe 2" 2−1/2" 3" Size Model Number Of 90° Elbows Used Standard Termination at Elevation 7501’ − 10,000’ Pipe 2" 2−1/2" 3" Size Model Number Of 90°...
  • Page 44 TYPICAL EXHAUST PIPE CONNECTIONS AND CONDENSATE TRAP INSTALLATION IN UPFLOW APPLICATIONS 2” 2” 2” 3” TRANSITION 2” DO NOT transition from smaller to larger pipe size in horizontal runs of exhaust pipe. Use only the factory− supplied trap. Trap can be installed on TRAP either side of cabinet within 5 ft of the furnace...
  • Page 45 Intake Piping The SLP98UHV is designed for combustion air intake through an inlet in the unit’s top cap. Intake air piping is inde- The SLP98UHV furnace may be installed only in direct vent applications. pendent of exhaust piping. TYPICAL AIR INTAKE PIPE CONNECTIONS IN UPFLOW APPLICATIONS 3”...

  • Page 46: Vent Termination Clearances

    ‡ 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 26 Page 46...
  • Page 47 Details of Intake and Exhaust Piping Terminations for FIELD−SUPPLIED WALL TERMINATION OR Direct Vent Installations (15F74) WALL RING TERMINATION KIT NOTE − In Direct Vent installations, combustion air is taken NOTE − FIELD−PROVIDED from outdoors and flue gases are discharged to outdoors. REDUCER MAY BE 1/2"...
  • Page 48 TABLE 24 FIELD−SUPPLIED WALL TERMINATION OR EXHAUST PIPE TERMINATION SIZE REDUCTION (15F74) WALL RING TERMINATION KIT SLP98UHV With INTAKE ELBOW Exhaust Pipe Size Termination Pipe Size MODEL *070 2", 2−1/2" or 3" 1−1/2" NOTE − FIELD−PROVIDED *090 2", 2−1/2" or 3" 2"...

  • Page 49: Front View

    1 1/2" (38mm) accelerator EXHAUST VENT Front View provided with 71M80 & 44W92 kits for SIZE SL98UH070V36B TERMINATION PIPE PER INTAKE TABLE 24. FLASHING 12” (305mm) INTAKE (Not Furnished) Minimum Above Average Snow Accumulation Top View 1/2" (13mm) Foam Insulation in Unconditioned Space SHEET METAL STRAP (Clamp and sheet metal strap...

  • Page 50: Snow Accumulation

    WALL TERMINATION KITS (CLOSE−COUPLE) EXTENDED VENT FOR GRADE CLEARANCE 2 inch (51 mm) 22G44 (US) 3 inch (76 mm) 44J40 (US) If intake and exhaust pipe is less than 12 in. (305 mm) above snow accumulation or other obstructions, FIELD−PROVIDED field−fabricated piping must be installed.
  • Page 51 If this is not possible, a heat cable kit may be used on the condensate trap and line. Heating cable kit is available from Lennox in various lengths; 6 ft. (1.8m) − kit no. 26K68; 24 ft. (7.3m) − kit no.
  • Page 52 CONDENSATE ASSEMBLY SLP98UHV with Evaporator Coil 90° PVC Elbow Condensate Drain 5 Feet (field−provided) Connection In Unit Condensate trap and Maximum evaporator coil must be drained separately as shown. Adapter 1/2" slip X 1/2" Field−Provided Vent (field−provided) Drain Trap Field−Provided Assembly Vent (furnished)
  • Page 53 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 54 Gas Leak Detector is strongly recommended. It is available C−Safety or Emergency Shutdown through Lennox under part number 31B2001. See Corp. 8411−L10, for further details. Turn off unit power. Close manual and main gas valves.
  • Page 55 (available as Lennox part 10L34) to assist in G− Proper Combustion Furnace should operate minimum 15 minutes with correct measurement. manifold pressure and gas flow rate before checking com- 1 − Connect test gauge +" connection to manifold pres bustion.
  • Page 56 TABLE 29 Conversion Kit Requirements and Manifold Test Pressures LP/Propane High Altitude Pressure Manifold Pressure at All Altitudes (in. w.g.) Switch Kit Model Gas Orifice Size Low Fire High Fire Input 7,501 − 10,000 0 − 10,000 0 − 7,500 Size (35% rate) (100% rate)
  • Page 57 VII−MAINTENANCE Cleaning Heat Exchanger If cleaning the heat exchanger becomes necessary, follow the below procedures and refer to figure 1 when disassem- bling unit. Use papers or protective covering in front of fur- WARNING nace while removing heat exchanger assembly. 1 −...
  • Page 58 21 − Reinstall heat exchanger into cabinet making sure that 41 − Replace the blower compartment access panel. the clamshells of the heat exchanger assembly are 42 − Refer to instruction on verifying gas and electrical con- resting in the support located at the rear of the cabinet. nections when re−establishing supplies.
  • Page 59 VIII− Wiring and Sequence of Operation NOTE − The thermostat selection DIP switch on the control is 4 − After the 20−second warm−up period has ended, the gas factory−set in the TWO−STAGE" position. valve is energized and ignition occurs. At the same time, the control module begins an indoor blower 45−second Applications Using a Two−Stage Thermostat ON−delay.
  • Page 60 5 − If second−stage heat is required, the thermostat sec- 6 − If the heating demand continues beyond the third− ond−stage heat contacts close and send a signal to the stage on delay, the integrated control energizes the in- integrated control. The integrated control either in- ducer at high speed.
  • Page 61 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 62 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 63 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 64 IGNITION AND CALL FOR LOW FIRE WITH SINGLE−STAGE THERMOSTAT Safety Check Verify There Is No Main Burner Indoor Blower OFF After Flame 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 65 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 66 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 67 IX− Field Wiring TABLE 30 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 68 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 69 TABLE 30 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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