Lennox International Inc SL280UH090V36B, SL280UH090V48B Compressor, Thermostat energizes Y2

Page 50

TABLE 19

OPERATING SEQUENCE

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

OPERATING

 

 

 

 

SYSTEM DEMAND

 

 

SYSTEM RESPONSE

SEQUENCE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Thermostat Demand

 

Relative Humidity

 

Blower

 

System

Ste

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

W

W

 

 

 

Compressor

CFM

Comments

Condition

p

Y1

Y2

O

G

Status

 

D

1

2

 

 

(COOL)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NO CALL FOR DEHUMIDIFICATION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Normal Opera-

1

On

 

On

On

 

 

Acceptable

 

24

Low

70%*

 

tion − Y1

 

 

 

 

VAC

Compressor and indoor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

blower follow thermostat

Normal Opera-

 

 

 

 

 

 

 

 

 

24

 

 

2

On

On

On

On

 

 

Acceptable

 

High

100%

demand

tion − Y2

 

 

 

VAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ROOM THERMOSTAT CALLS FOR FIRST STAGE COOLING

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BASIC MODE (only active on a Y1 thermostat demand)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Normal Opera-

1

On

 

On

On

 

 

Acceptable

 

24

Low

70%*

ComfortSense® 7000

tion

 

 

 

 

 

 

 

 

 

VAC

 

 

thermostat energizes Y2

 

 

 

 

 

 

 

 

 

 

 

 

 

Dehumidification

2

On

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 Opera-

1

On

 

On

On

 

 

Acceptable

 

24

Low

70%*

 

tion

 

 

 

 

VAC

Dehumidification mode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

begins when humidity is

Dehumidification

 

 

 

 

 

 

 

 

 

0

 

 

2

On

On

On

On

 

 

Demand

 

High

70%**

greater than set point

call

 

 

 

VAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ComfortSense® 7000

 

 

 

 

 

 

 

 

 

 

 

 

 

thermostat will try to

Dehumidification

 

 

 

 

 

 

 

 

 

0

 

 

maintain room humidity

1

On

On

On

On

 

 

Demand

 

High

70%**

setpoint by allowing the

call ONLY

 

 

 

VAC

 

 

 

 

 

 

 

 

 

 

 

room space to maintain a

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

cooler room thermostat

 

 

 

 

 

 

 

 

 

 

 

 

 

setpoint***

 

 

 

 

 

 

 

 

 

 

 

 

 

ROOM THERMOSTAT CALLS FOR FIRST AND SECOND STAGE COOLING

 

 

 

 

 

 

 

 

 

 

 

 

BASIC MODE (only active on a Y1 thermostat demand)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Normal Opera-

1

On

On

On

On

 

 

Acceptable

 

24

High

100%

ComfortSense® 7000

tion

 

 

 

 

 

 

 

 

 

VAC

 

 

thermostat energizes Y2

 

 

 

 

 

 

 

 

 

 

 

 

 

Dehumidification

2

On

On

On

On

 

 

Demand

 

0

High

70%**

and de−energizes D on a

 

 

 

call for de−humidification

Call

 

 

 

VAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PRECISION MODE (operates independent of a Y1 thermostat demand)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Normal Opera-

1

On

 

On

On

 

 

Acceptable

 

24

Low

70%*

 

tion

 

 

 

 

VAC

Dehumidification mode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

begins when humidity is

Dehumidification

 

 

 

 

 

 

 

 

 

0

 

 

2

On

On

On

On

 

 

Demand

 

High

70%**

greater than set point

call

 

 

 

VAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Dehumidification

1

On

On

On

On

 

 

Demand

 

0

High

70%**

ComfortSense® 7000

call ONLY

 

 

 

VAC

thermostat will try to

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

maintain room humidity

 

Jumpers at indoor unit with a two stage outdoor unit

 

 

 

setpoint by allowing the

 

 

 

 

room space to maintain a

 

Cut factory jumper from Y1 to Y2 or cut W915 (Y1 to Y2)

 

 

 

 

 

cooler room thermostat

 

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

 

 

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 *Normal operation first stage cooling blower speed is 70% COOL speed.

**Dehumidification blower speed is, reduced to 70% of COOL.

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

Page 50

Page 49 Page 51
Image 50
Page 49 Page 51
Contents Installation Instructions SL280UHV Table of ContentsSide Return Air Opening Unit Dimensions − inches mmReturn air from both sides Either SideSight Glass Access Panel Blower AssemblyParts Arrangement Shipping and Packing List Safety InformationSL280UHV Gas Furnace Air Handler Unit Use of Furnace as Construction HeaterGeneral EvaporatorCombustion, Dilution & Ventilation Air Equipment in Confined Space ALL AIR from InsideEquipment Confined Space ALL AIR from Outside Equipment in Confined Space ALL AIR from OutsideEquipment in Confined Space Blower Motor Rigid LEG Setting EquipmentBottom Indoor AIR 20 X 25 XFurnace Front Return AIR BaseEnd Bottom Horizontal Application Installation Clearances Top LeftRight Typical Horizontal ApplicationFilters Duct SystemTop Vent Discharge VentingUpflow Position Left Side Vent DischargeSide Vent Discharge Horizontal Left PositionHorizontal Right Position Sticker Common Venting Using Metal−Lined Masonry ChimneyDisconnected Vent Vent PipeVent Connector Through an unused masonry chimney flue is not considered102 127 −1/2 152 178 10−1/2 MIN MAX Feet FAN + FAN FAN + NAT 130 Carbon Monoxide Poisoning Hazard Gas Piping Ers or straps. Install a drip leg in vertical pipe runs to− In some localities, codes may require the installation Every 8 to 10 feet 2.44 to 3.01 m with suitable hangRight−Side Air Discharge Horizontal ApplicationLeft−Side Air Discharge Electrostatic Discharge ESD Interior MAKE−UP BOX InstallationElectrical BOXNon−Communicating CommunicatingIcomfortt Integrated Control Outdoor Unit Icomfort Touch 120V Connections NON−COMMUNICATING System WiringCommunicating System Wiring 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 + = Data High Connection − = Data LOW Connection Integrated ControlRS−BUS Link TB82, future use −10% approx OFF On−Board Links 940 1045985 880SL280UH090V36B Blower Performance less filter 1155 12801220 10951170 12951235 11101165 13601230 11001160 12901225 1380+18% 1605 SL280UH110V60C Blower Performance less filter +18% 1785 SL280UH135V60D Blower Performance less filter Operating Sequence Compressor Thermostat energizes Y2White Rodgers GAS Valve For Your Safety Read Before LightingUnit Start−Up Honeywell GAS ValveProper Combustion Gas Pressure AdjustmentGAS Meter Clocking Chart DialHigh Altitude Other Unit Adjustments Heating Sequence of OperationSEC Heating Operation with TWO−STAGE ThermostatHeating Operation with Single Stage Thermostat Service Electrical SHOCK, Fire Or Explosion Hazard11− Back wash using steam. Begin from the burner opening SL280UHV BURNER, Combustion AIR Inducer Assembly13− To clean the combustion air inducer visually inspect 17− Reinstall burner box, manifold assembly and burner boxSL280UHV NOX Inserts Planned Service Repair Parts ListIntegrated Control Diagnostic Modes Integrated Control Diagnostic CodesPower at the thermostat. Alert stops all services Normal operation 5 seconds after fault recoveredFurnace / air handler. Clears after fault recovered Equipment is unable to communicate. IndicatesControl will still operate on default parameter set Reconfigure the system. Replace control if heatingMissioning and Execute ’Set Factory Default mode’ Ate feature will be set as ’installed’ and that couldFault is cleared Low pressure switch failed openSumes normal operation after fault is cleared Tion after fault is clearedSoft lockout or reset Open or not within specifications −hour soft lockOut. Clears when flame has been proven stable To flame failureError after current is sensed in both RUN Pair/add duct. Cleared after the current service deIs not running. Check power to outdoor unit. Clears Vice is removed, or after power resetSor run cycle, or after power reset Program Unit Capacity/Size Mode FinishedTroubleshooting Heating Sequence of Operation Call for FIRST−STAGE HeatCall for SECOND−STAGE Heat Call for Heat SatisfiedCall for Heat Satisfied FIRST−STAGE Heat SECOND−STAGE Heat 2ND Stage HeatTroubleshooting Cooling Sequence of Operation Call for CoolingTroubleshooting Continuous Fan Sequence of Operation Call for FAN
Top Page Image Contents