TABLE 21
SL280DFV, Non−Communicating Thermostat with Humidity Control Feature and Two−Speed Outdoor Unit
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SEQUENCE |
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| Thermostat Demand |
| Relative Humidity |
| Blower |
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System |
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Step |
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| Compressor |
| CFM | Comments | |
Condition | Y1 | Y2 | O | G |
| Status | D |
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| 1 |
| 2 |
| (COOL) |
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NO CALL FOR DEHUMIDIFICATION |
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Normal Operation − | 1 | On |
| On | On |
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| Acceptable | 24 | Low |
| 70%* |
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Y1 |
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| VAC |
| Compressor and indoor | |||||||
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| blower follow thermostat |
Normal Operation − |
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| 24 |
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2 | On | On | On | On |
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| Acceptable | High |
| 100% | demand | ||
Y2 |
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| VAC |
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ROOM THERMOSTAT CALLS FOR FIRST STAGE COOLING |
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BASIC MODE (only active on a Y1 thermostat demand) |
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Normal Operation | 1 | On |
| On | On |
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| Acceptable | 24 | Low |
| 70%* | ComfortSense® 7000 |
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| VAC |
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| thermostat energizes Y2 |
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Dehumidification | 2 | On | On | On | On |
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| Demand | 0 | High |
| 70%** | and de−energizes D on a |
Call |
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| VAC |
| call for de−humidification | ||||||||
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PRECISION MODE (operates independent of a Y1 thermostat demand) |
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Normal Operation | 1 | On |
| On | On |
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| Acceptable | 24 | Low |
| 70%* |
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| VAC |
| Dehumidification mode | ||||||||
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| begins when humidity is |
Dehumidification |
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| 0 |
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2 | On | On | On | On |
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| Demand | High |
| 70%** | greater than set point | ||
call |
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| ComfortSense® 7000 |
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| thermostat will try to |
Dehumidification |
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| 0 |
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| maintain room humidity |
1 | On | On | On | On |
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| Demand | High |
| 70%** | setpoint by allowing the | ||
call ONLY |
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| room space to maintain | ||
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| a cooler room thermostat |
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| setpoint*** |
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ROOM THERMOSTAT CALLS FOR FIRST AND SECOND STAGE COOLING |
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BASIC MODE (only active on a Y1 thermostat demand) |
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Normal Operation | 1 | On | On | On | On |
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| Acceptable | 24 | High |
| 100% | ComfortSense® 7000 |
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| VAC |
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| thermostat energizes Y2 |
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Dehumidification | 2 | On | On | On | On |
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| Demand | 0 | High |
| 70%** | and de−energizes D on a |
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| call for de−humidification | ||||||||||
Call |
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| VAC |
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PRECISION MODE (operates independent of a Y1 thermostat demand) |
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Normal Operation | 1 | On |
| On | On |
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| Acceptable | 24 | Low |
| 70%* |
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| VAC |
| Dehumidification mode | ||||||||
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| begins when humidity is |
Dehumidification |
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| 0 |
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2 | On | On | On | On |
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| Demand | High |
| 70%** | greater than set point | ||
call |
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| VAC |
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Dehumidification | 1 | On | On | On | On |
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| Demand | 0 | High |
| 70%** | ComfortSense® 7000 |
call ONLY |
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| VAC |
| thermostat will try to | ||||||||
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| maintain room humidity |
| Jumpers at indoor unit with a two stage outdoor unit |
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| setpoint by allowing the | ||||||||
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| Cut factory jumper from Y1 to Y2 or cut W915 (Y1 to Y2) |
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| a cooler room thermostat | ||||||||||
| With Condensing unit − Cut W914 (R to DS) on SureLight® board |
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| 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.
Page 38
