TABLE 25
COOLING OPERATING SEQUENCE
SLP98DFV and Two−Stage Outdoor Unit
OPERATING |
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SEQUENCE |
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| Demand |
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| Relative Humidity |
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System |
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Step | 1st | 2nd |
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| Compressor | CFM | Comments | |
Condition |
| O | G | Status | D* | ||||||
| stage | stage |
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| (COOL) |
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NO CALL FOR DEHUMIDIFICATION |
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Normal Operation − | 1 | On |
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| On | On | 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 | Acceptable | High | 100% | demand | ||
Y2 |
| VAC | |||||||||
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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% | Thermostat energizes | |
| VAC | ||||||||||
| 2nd stage and de−ener- | ||||||||||
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Dehumidification | 2 | On | On | On | On | Demand | 0 | High | 70% | gizes D on a call for de− | |
humidification | |||||||||||
Call | VAC | ||||||||||
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PRECISION MODE (operates independent of a Y1 thermostat demand)
Normal Operation | 1 | On |
| On | On | 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 | Demand | High | 70% | greater than set point | |||
call | VAC | ||||||||||
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| Thermostat will keep out- | |
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| door unit energized after | |
Dehumidification | 1 | On | On | On | On | Demand | 0 | High | 70% | cooling temperature set- | |
call ONLY | VAC | point has been reached | |||||||||
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| in order to maintain room | |
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| humidity setpoint.* | |
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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% | Thermostat energizes | |
VAC | |||||||||||
2nd stage and de−ener- | |||||||||||
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Dehumidification | 2 | On | On | On | On | Demand | 0 | High | 70% | gizes D on a call for de− | |
humidification | |||||||||||
Call | VAC | ||||||||||
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PRECISION MODE (operates independent of a Y1 thermostat demand)
Normal Operation | 1 | On |
| On | On | Acceptable | 24 |
| Low |
| 70% |
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| VAC |
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| 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 | Demand |
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| 70% | greater than set point | ||
call | VAC |
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Dehumidification | 1 | On | On | On | On | Demand | 0 |
| High |
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call ONLY | VAC |
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| Thermostat will keep out- |
| On−board links at indoor unit with a two−stage outdoor unit: |
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| door unit energized after | |||||||
| Cut factory link from Y1 to Y2 or cut W915 (Y1 to Y2) on SureLight® inte- | cooling temperature set- | ||||||||||
| grated control. |
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| point has been reached | |
| With Condensing unit − Cut W914 (R to DS) on SureLight® integrated control; | in order to maintain room | ||||||||||
| With Heat Pump − Cut W914 (R to DS) & W951 (R to O) on SureLight® |
| humidity setpoint. | |||||||||
| integrated control. |
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| *ComfortSense® 7000 thermostat only |
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Page 44
