Contrec 212 - Operating Modes

212-M-V2.1
Operation 27
3.6 OPERATING MODES
The Model 212 may be programmed to operate in either of four modes, as
follows:
1. Heating
2. Cooling
3. Heating/Cooling
4. Charge/Discharge
3.6.1 Heating
Heating mode is used when the application is for Heating only and assumes that
the Feed Temperature will always be higher than the Return Temperature
(positive∆t).
IftheFeedTemperatureislowerthantheReturnTemperature(negative∆t),
then no Energy is totalised, but Volumetric Flow is still totalised.
3.6.2 Cooling
Cooling mode is used when the application is for Cooling only and assumes
that the Feed Temperature will always be lower than the Return Temperature
(negative∆t). IftheFeedTemperatureishigherthantheReturnTemperature
(posi tive∆t),thennoEnerg y istotalised,but VolumetricFlowisstilltotalised.
3.6.3 Heating/Cooling
Heating/Cooling mode is used where the flow of Energy may be for Heating
orCooling. In this mode Energyi s increasedregardless of whether ∆t is
positive or negative.
3.6.4 Charge/Discharge
Charge/Discharge mode is used when it is necessary to maintain two Energy
totals.
Oneforwh en∆tispositiveandoneforwhen∆tisnegative. Onlyonetotal
at a time is used.