Specifications

PRT-CTRL-SE Protege System Controller Reference Manual | PRT-CTRL-SE 221
Register Offset Register Function
4 Cooling Hysteresis Setting
The cooling hysteresis value is subtracted from the cooling set point to allow the plant to
drive slightly below the set point. This allows specific heating and cooling tuning. Setting
a value of 0 is not recommended as it can cause oscillations between the dead band and
cooling modes.
5 Relative Humidity Hysteresis Setting
The relative humidity hysteresis value is subtracted or added depending if the set point
has already been exceeded to the relative humidity set point. This allows the relative
humidity cycles to be tuned. Setting a value of 0 is not recommended as it can cause the
system to oscillate between the relative humidity states.
6 Warm Up Set Point
If the warm up set point is not equal to 0 the system will check the space temperature
against the warm up set point when the occupied relay is activated. If the internal temp is
below the warm up set point the system will close the fresh air damper and drive the
heating to achieve the heating set point. Once set point is reached the unit will operate in
a normal mode.
7 Fresh Air Cooling Set Point
If the fresh air cooling set point is not 0 the system will check the fresh air temperature
when a cooling demand exists and modulate the dampers to allow free cooling. The
system will remain in the free cooling mode for the time set by the free cooling time.
8 Stage 1 Demand Value
The stage one demand value is the amount of plant error that is required to activate the
first stage of cooling or heating. Plant error is calculated using a custom PI loop. The
error is accumulated using the settings for the Integral Value and Hysteresis Settings. The
error value is the difference between the set point and the current space temperature
with the addition of the accumulated error.
9 Stage 2 Demand Value
The stage two demand value is the amount of plant error that is required to activate the
second stage of cooling or heating.
10 Stage 3 Demand Value
The stage three demand value is the amount of plant error that is required to activate the
third stage of cooling or heating.
11 Stage 4 Demand Value
The stage four demand value is the amount of plant error that is required to activate the
fourth stage of cooling or heating.
12 Current RTHP Mode
The current mode that the RTHP is operating in. The RTHP modes are listed in the
section below.
13 Current Plant Error
The current plant error is the error in the temperature value difference between the set
point and the current temperature. This value is for display only and used to calculate the
drive required for the RTHP to obtain the desired set point.
14 Integral Error
The integral error is the amount of raw calculated error using the integral portion of the PI
loop used for the control of the RTHP unit and is calculated ONLY in a cooling or heating
requirement mode.