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Sd = 2
Stage 2 Span (See page 33 for an overview of this control function)
Hysteresis for Stage 2.
(difference between heating and cooling turning on and off)
Sd = 1
0.5c
Sd = 2
1.0c
Sd = 3
1.5c
S3 = 2
Stage 3 Heat Span
When set to 2 stage heat pump, this value sets the span for the 3rd stage heating.
SU = 10
Smart Upstage
When the room temperature is far enough from the set temperature to call extra
heating and cooling stages, the SMT‐770 will wait the minimum Su= value before
bringing on extra stages. This delay provides time for the thermostat to determine
whether additional stages are needed or if the current stages will bring the room
to set point in a "reasonable" period of time.
dt= 30
Upstage delay time
Time in minutes before next stage of heating or cooling is to be called.
Delay only operates if stage trip temperature has not yet been reached.
Adjustable between 10 ~ 90 Minutes in 5 minute steps.
oS = 0
Optimised Start/stop. (Adaptive Recovery)
OS = 0 ‐ Optimised start/stop function Off.
OS = 1 ‐ Optimised start/stop function running.
(See page 42 for more information on this function)
C2 = 0.0 Calibration Remote Sensor
28 | P a g e
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