Protege System Controller Reference Manual

Register Offset
Register Function
19 Integral Calculation Time
The integral calculation time is a time base used by the integral portion of the PI loop to
update the Integral Error. It is advised not to set this below a value of 30 seconds.
20 Fresh Air Damper Normal Setting
The fresh air damper normal setting is the value that is output on the fresh air economies
analog output used to control the fresh air damper position. This value allows the system
to be tuned to an appropriate setting to allow the require Litres Per Second of fresh air to
enter the RTHP.
Roof Top Heat Pack Mode Definition
Register Offset
Register Function
0 RTHP Idle Condition
The programmable function is idle and no processing is taking place.
1 RTHP Waiting For Start Signal
The programmable function is waiting for the enable PGM signal to be controlled to an
ON state to start operation. This is usually managed by a schedule or the alarm status.
When the signal is received the Fan PGM will be activated and the programmable
function will enter a delay of 30 seconds before starting.
2 RTHP Warm Up Check
If the RTHP is programmed to enter a warm up state at the start of operation the
temperature will be checked here to verify if the warm up temperature is above the
current space temperature if it is then the RTHP will enter the warm up mode.
3 RTHP Warm Up Space
When in warm up mode the RTHP is driven to full capacity to get the space above the
heating set point in the fastest possible time. Once the temperature reaches this level the
system will operate normally.
4 RTHP Deadband Process
The deadband process is where the RTHP will wait for a condition that is outside the set
points for heating, cooling or dehumidification.
5 On Call For Space Heating
The space temperature is below the heating set point and the function to start the
heating process is active. This will activate the stages required to bring the temperature
up to the heating set point.
6 On Call For Space Cooling
The space temperature is above the cooling set point and the function to start the
cooling process is active. This will activate the stages required to bring the temperature
down to the cooling set point.
7 On Call For Fresh Air Space Cooling
8 Heating Stage Off
The space temperature is above the cooling set point and the outside air is below the
free air cooling set point, the RTHP will oscillate the fresh air economizer in attempt to
cool the space using the fresh air intake. This will remain active until the temperature is
below the cooling set point or if the free cooling fails to achieve set point in the set time
(Free Cooling Time) mode 6 will be entered.
Heating stages are being turned off progressively due to the set point being reached.
230 PRT-CTRL-SE Protege System Controller Reference Manual | PRT-CTRL-SE