EPH Controls CDC2 Installation And Operation Manual page 22

PO 1 Operating Mode
(Normal / Delay Start / TPI)
Time Proportional Integral Mode (TPI)
When the thermostat is in TPI mode and the temperature is rising in the
zone and falls into the Proportional Bandwidth section, TPI will start to
affect the thermostats operation. The thermostat will turn on and off as
it gains heat so that it doesn't overshoot the target by too much. It will
also turn on if the temperature is falling so it doesn't undershoot the
target which will leave the user with a more comfortable level of heat.
There are 2 settings that will affect the thermostats operation
1. The number of heating cycles per hour
2. The Proportional Bandwidth
CyC – Number of Heating Cycles per hour 6 Cycles
This value will decide how often the thermostat will cycle the heating
on and off when trying to achieve the target temperature. You can
select 2/3/6 or 12.
Pb -Proportional Bandwidth 2°C
20
CDC2