Salus Limited. ST880ZB User Manual
ST880ZB / Optima USA
Rev. 3.9
Form No. : F-ENG-1023A
Page 3 of 38
Relative humidity measurement
Humidity display format:
Percentage RH
(Humidity data is only for thermostat internal use. It is displayed in test mode
only. Humidity information is not available to end users.)
(Humidity data is only for thermostat internal use. It is displayed in test mode
only. Humidity information is not available to end users.)
Display / measurement range
20% ~ 95% in 1% resolution
Humidity measurement accuracy:
+/-8% at 60%, 25°C
+/-10% full measurement range.
+/-10% full measurement range.
Temperature Control
Temperature setting range:
(Program, Temporary hold and
Permanent Hold)
(Program, Temporary hold and
Permanent Hold)
Heating and cooling:
Fahrenheit: 41°F ~ 95°F, 1°F setting resolution
Celsius: 5°C ~ 35°C, 1°C setting resolution
Heating setpoint cannot be set higher than cooling in the same program.
Fahrenheit: 41°F ~ 95°F, 1°F setting resolution
Celsius: 5°C ~ 35°C, 1°C setting resolution
Heating setpoint cannot be set higher than cooling in the same program.
Temperature setting range:
(Vacation hold)
(Vacation hold)
Heating only
Fahrenheit: 32°F ~ 60°F, 1°F setting resolution
Celsius: 0°C ~ 15°C, 1°C setting resolution
Fahrenheit: 32°F ~ 60°F, 1°F setting resolution
Celsius: 0°C ~ 15°C, 1°C setting resolution
Switching differential (span):
Stage 1:
Fahrenheit: 0.5°F, 1.0°F and 2.0°F user selectable.
Celsius: 0.2°C, 0.5°C and 1.0°C user selectable.
Stage 2:
Fahrenheit: 2.0°F (fixed).
Celsius: 1.0°C (fixed).
Stage 3:
Fahrenheit: 2.0°F (fixed).
Celsius: 1.0°C (fixed).
Fahrenheit: 0.5°F, 1.0°F and 2.0°F user selectable.
Celsius: 0.2°C, 0.5°C and 1.0°C user selectable.
Stage 2:
Fahrenheit: 2.0°F (fixed).
Celsius: 1.0°C (fixed).
Stage 3:
Fahrenheit: 2.0°F (fixed).
Celsius: 1.0°C (fixed).
Auto season changeover deadband:
Fahrenheit: 5°F ~ 11°F, 1°F setting resolution
Celsius: 2.5°C ~ 6°C, 0.5°C setting resolution
Celsius: 2.5°C ~ 6°C, 0.5°C setting resolution
Temperature control accuracy:
Base on NEMA test result:
Span set to minimum. Total loading 2.5A. After control is stabilized, the
following should be achieved:
Differential: less than 2°F
Droop: less than +/-1°F
Span set to minimum. Total loading 2.5A. After control is stabilized, the
following should be achieved:
Differential: less than 2°F
Droop: less than +/-1°F
Control protection
Compressor short cycle protection timer:
5 ~ 10 minutes, 1 minute setting resolution.
Set through network.
Set through network.
Residual Cooling fan delay timer:
30 ~ 300 seconds, 30 seconds setting resolution.
Set through network.
Set through network.
Auto heat cut-off:
When room temperature is higher than 99°F or 35°C.
Auto cool cut-off:
When room temperature is lower than 40°F or 5°C.
Temperature error cut-off:
When error is found in room temperature measurement.
Filter counter
Filter counter:
Counts Y1 or G turn on time for up to 999 hours.
Filter change reminder:
300, 500 or 700 hours user selectable.
Indication on LCD when Filter counter reached the reminder setting.
Indication on LCD when Filter counter reached the reminder setting.