Lennox International Inc SL280UH070V36A, SL280UH090V48B, SL280UH090V36B Operating Sequence

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TABLE 18

OPERATING SEQUENCE

SL280UHV, Non−Communicating Thermostat with Humidity Control Feature and Single−Speed Outdoor Unit

OPERATING

SYSTEM DEMAND

SYSTEM RESPONSE

SEQUENCE

Thermostat Demand

Relative Humidity

Blower

System

Compres-

Step

W

CFM

Comments

Condition

Y1

O

G

Status

D

sor

1

(COOL)

NO CALL FOR DEHUMIDIFICATION

24

Compressor and indoor

Normal Operation

1

On

On

On

Acceptable

High

100%

blower follow thermostat

VAC

demand

BASIC MODE (only active on a Y1 thermostat demand)

Normal Operation

1

On

On

On

Acceptable

24

High

100%

ComfortSense® 7000

VAC

thermostat energizes Y1

Dehumidification

2

On

On

On

Demand

0

High

70%*

and de−energizes D on a

Call

VAC

call for de−humidification

PRECISION MODE (operates independent of a Y1 thermostat demand)

Normal Operation

1

On

On

On

Acceptable

24

High

100%

VAC

Dehumidification mode

begins when humidity is

Dehumidification

0

2

On

On

On

Demand

High

70%*

greater than set point

call

VAC

Dehumidification

0

ComfortSense® 7000

1

On

On

On

Demand

High

70%*

thermostat will try to

call ONLY

VAC

maintain room humidity

setpoint by allowing the

Jumpers at indoor unit with a single stage outdoor unit

room space to maintain a

With Condensing unit − Cut W914 (R to DS) on SureLight® control

cooler room thermostat

With Heat Pump − Cut W914 (R to DS) & W951 (R to O) on SureLight® control

setpoint**

Dave Lennox ComfortSense® 7000 thermostat to use for this application − Y2081 4 heat / 2 cool *Dehumidification blower speed is 70% of COOL speed for all units .

**In Precision mode, ComfortSense® 7000 thermostat will maintain room temperature up to 2 °F (1.2°C) cooler than room setting.

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Contents Table of Contents Installation Instructions SL280UHVReturn air from both sides Unit Dimensions − inches mmSide Return Air Opening Either SideParts Arrangement Access Panel Blower AssemblySight Glass SL280UHV Gas Furnace Safety InformationShipping and Packing List General Use of Furnace as Construction HeaterAir Handler Unit EvaporatorCombustion, Dilution & Ventilation Air Space ALL AIR from Inside Equipment in ConfinedEquipment in Confined Space Equipment in Confined Space ALL AIR from OutsideEquipment Confined Space ALL AIR from Outside Bottom Setting EquipmentBlower Motor Rigid LEG Furnace Front 20 X 25 XIndoor AIR Return AIR BaseRight Horizontal Application Installation Clearances Top LeftEnd Bottom Typical Horizontal ApplicationDuct System FiltersUpflow Position VentingTop Vent Discharge Left Side Vent DischargeHorizontal Right Position Horizontal Left PositionSide Vent Discharge Disconnected Vent Common Venting Using Metal−Lined Masonry ChimneySticker Vent PipeThrough an unused masonry chimney flue is not considered Vent Connector102 127 −1/2 152 178 10−1/2 MIN MAX Feet FAN + FAN FAN + NAT 130 Carbon Monoxide Poisoning Hazard − In some localities, codes may require the installation Ers or straps. Install a drip leg in vertical pipe runs toGas Piping Every 8 to 10 feet 2.44 to 3.01 m with suitable hangLeft−Side Air Discharge Horizontal ApplicationRight−Side Air Discharge Electrical Interior MAKE−UP BOX InstallationElectrostatic Discharge ESD BOXCommunicating Non−CommunicatingIcomfortt Integrated Control Outdoor Unit Icomfort Touch Communicating System Wiring NON−COMMUNICATING System Wiring120V Connections ApplicationsDIP Switch Settings and On−Board Links See figure OFF Single Stage Thermostat w Dual fuel capa Bilities SL280UHV Schematic Wiring Diagram Typical SL280UHV Field Wiring Diagram RS−BUS Link TB82, future use Integrated Control+ = Data High Connection − = Data LOW Connection −10% approx OFF On−Board Links 985 1045940 880SL280UH090V36B Blower Performance less filter 1220 12801155 10951235 12951170 11101230 13601165 11001225 12901160 1380+18% 1605 SL280UH110V60C Blower Performance less filter +18% 1785 SL280UH135V60D Blower Performance less filter Operating Sequence Thermostat energizes Y2 CompressorUnit Start−Up For Your Safety Read Before LightingWhite Rodgers GAS Valve Honeywell GAS ValveGAS Meter Clocking Chart Gas Pressure AdjustmentProper Combustion DialHigh Altitude Heating Sequence of Operation Other Unit AdjustmentsHeating Operation with Single Stage Thermostat Heating Operation with TWO−STAGE ThermostatSEC Electrical SHOCK, Fire Or Explosion Hazard Service13− To clean the combustion air inducer visually inspect SL280UHV BURNER, Combustion AIR Inducer Assembly11− Back wash using steam. Begin from the burner opening 17− Reinstall burner box, manifold assembly and burner boxSL280UHV NOX Inserts Repair Parts List Planned ServiceIntegrated Control Diagnostic Codes Integrated Control Diagnostic ModesFurnace / air handler. Clears after fault recovered Normal operation 5 seconds after fault recoveredPower at the thermostat. Alert stops all services Equipment is unable to communicate. IndicatesMissioning and Execute ’Set Factory Default mode’ Reconfigure the system. Replace control if heatingControl will still operate on default parameter set Ate feature will be set as ’installed’ and that couldSumes normal operation after fault is cleared Low pressure switch failed openFault is cleared Tion after fault is clearedOut. Clears when flame has been proven stable Open or not within specifications −hour soft lockSoft lockout or reset To flame failureIs not running. Check power to outdoor unit. Clears Pair/add duct. Cleared after the current service deError after current is sensed in both RUN Vice is removed, or after power resetSor run cycle, or after power reset Finished Program Unit Capacity/Size ModeCall for FIRST−STAGE Heat Troubleshooting Heating Sequence of OperationCall for Heat Satisfied Call for SECOND−STAGE Heat2ND Stage Heat Call for Heat Satisfied FIRST−STAGE Heat SECOND−STAGE HeatCall for Cooling Troubleshooting Cooling Sequence of OperationCall for FAN Troubleshooting Continuous Fan Sequence of Operation