Lennox International Inc SL280DFV VAC Room Thermostat Calls for First Stage Cooling

Page 38

TABLE 21

SL280DFV, Non−Communicating Thermostat with Humidity Control Feature and Two−Speed Outdoor Unit

OPERATING

 

 

 

 

SYSTEM DEMAND

 

 

SYSTEM RESPONSE

SEQUENCE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Thermostat Demand

 

Relative Humidity

 

Blower

 

System

 

 

 

 

 

 

 

 

 

 

 

 

Step

 

 

 

 

W

 

W

 

 

Compressor

 

CFM

Comments

Condition

Y1

Y2

O

G

 

Status

D

 

 

1

 

2

 

(COOL)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NO CALL FOR DEHUMIDIFICATION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Normal Operation −

1

On

 

On

On

 

 

 

Acceptable

24

Low

 

70%*

 

Y1

 

 

 

 

VAC

 

Compressor and indoor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

blower follow thermostat

Normal Operation −

 

 

 

 

 

 

 

 

 

24

 

 

 

2

On

On

On

On

 

 

 

Acceptable

High

 

100%

demand

Y2

 

 

 

VAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ROOM THERMOSTAT CALLS FOR FIRST STAGE COOLING

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BASIC MODE (only active on a Y1 thermostat demand)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Normal Operation

1

On

 

On

On

 

 

 

Acceptable

24

Low

 

70%*

ComfortSense® 7000

 

 

 

 

 

 

 

 

 

 

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 Operation

1

On

 

On

On

 

 

 

Acceptable

24

Low

 

70%*

 

 

 

 

 

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 Operation

1

On

On

On

On

 

 

 

Acceptable

24

High

 

100%

ComfortSense® 7000

 

 

 

 

 

 

 

 

 

 

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 Operation

1

On

 

On

On

 

 

 

Acceptable

24

Low

 

70%*

 

 

 

 

 

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

 

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

 

 

 

 

 

 

 

a cooler room thermostat

 

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

 

 

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

 

setpoint***

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.

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Contents Installation Instructions SL280DFV Table of ContentsUnit Dimensions − inches mm TOP ViewParts Arrangement Shipping and Packing List Safety InformationSL280DFV Gas Furnace Use of Furnace as Construction Heater GeneralCombustion, Dilution & Ventilation Air Equipment in Confined Space ALL AIR from Inside Equipment Confined Space ALL AIR from Outside Equipment in Confined Space ALL AIR from OutsideEquipment in Confined Space Downflow Installation NON−COMBUSTIBLE Floor Opening SizeCooling Coil Setting EquipmentSL280DFV Unit Properly Plenum Sized Floor OpeningFilters Duct System VentingTables for installations −1/2 MIN MAX 126 FAN + FAN FAN + NAT 168 Gas Piping Carbon Monoxide Poisoning HazardGas Pipe Capacity − ft3/hr m3/hr Electrical MAKE−UP BOXNon−Communicating Icomfortt Integrated Control Outdoor Unit Icomfort Touch Applications System Wiring120V Connections 24V Humidifier ConnectionsSL280 Field Wiring Applications With Conventional Thermostat OFF Single Stage Thermostat w Dual fuel capa Bilities SL280DFV Schematic Wiring Diagram Typical SL280DFV Field Wiring Diagram Integrated Control + = Data High Connection − = Data LOW Connection−10% approx OFF On−Board Links Blower Data 1400 Operating System Demand System Response Sequence VAC Room Thermostat Calls for First Stage Cooling Unit Start−Up GAS Valve Shown in on PositionGas Pressure Adjustment Proper CombustionManifold Pressure Settings High AltitudeOther Unit Adjustments Heating Sequence of OperationHeating Operation with TWO−STAGE Thermostat SECService Electrical SHOCK, Fire Or Explosion HazardSL280DFV BURNER, Combustion AIR Inducer Assembly Page Planned Service Repair Parts ListIntegrated Control Diagnostic Modes Integrated Control Diagnostic CodesEquipment is unable to communicate. Indicates Reconfigure the system. Replace control if heating Low pressure switch failed open To flame failure Limiters to protect the motor from damage caused Sor run cycle, or after power reset Program Unit Capacity/Size Mode Volt power−up of the furnace control,Troubleshooting 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
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Manual 6 pages 24.8 Kb

DAVE LENNOX SIGNATURE COLLECTION GAS FURNACE, SL280DFV specifications

Lennox International Inc has made a significant mark in the heating, ventilation, and air conditioning (HVAC) industry, known for its commitment to innovation and energy efficiency. One of its standout products is the SL280DFV model, a high-efficiency gas furnace designed to meet the needs of modern homes.

The SL280DFV boasts an impressive Annual Fuel Utilization Efficiency (AFUE) rating of up to 80%. This rating indicates that the furnace converts 80% of the fuel it consumes into usable heat, making it a cost-effective choice for homeowners. The high efficiency not only reduces energy bills but also lessens the environmental impact by minimizing greenhouse gas emissions.

One of the key features of the SL280DFV is its two-stage gas valve operation. This technology allows the furnace to operate at two levels of heating output: low stage for milder days and high stage for extremely cold temperatures. This adaptability enhances comfort by maintaining more consistent indoor temperatures while also saving energy when full power is unnecessary.

Another innovative aspect of the SL280DFV is its variable-speed blower motor. This smart technology enables the furnace to adjust airflow based on the heating needs of a home, which promotes quiet operation and improved temperature consistency throughout living spaces.

The SL280DFV is equipped with a durable heat exchanger that is designed to withstand the rigors of daily use, contributing to the unit’s longevity. Additionally, the furnace features a smart ignition system that ensures reliable start-ups, so homeowners can depend on it through the coldest winter nights.

Safety is also a priority in the design of the SL280DFV. It includes various safety features such as a built-in flame sensor and advanced venting system, designed to avert hazardous situations and ensure optimal operation.

Furthermore, Lennox offers convenient installation and maintenance support, making the SL280DFV not only an efficient heating solution but also a practical choice for homeowners. With its blend of advanced technology, high efficiency, and reliability, the Lennox SL280DFV is an appealing option for those looking to upgrade their home’s heating system, promising comfort and peace of mind for many winters to come.
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