Yokogawa 212 Heat Calculator - Manual (Page 31)

3.7 PEAK AND OFF-PEAK
When the Model 212 is programmed for either Heating, Cooling or Heating and
Cooling, it is possible to program Peak and Off-Peak times. This enables the
Model 212 to record Energy totals in two separate registers, depending on the
time of day.
A 24 hour period can be programmed as having one peak period and one off-peak
period. For example, if "PEAK ON" is programmed as 09 and "PEAK OFF" is
programmed as 18, then between 9.00am and 6.00pm totalisation would occur in
the Peak register and between 6.00pm and 9.00am, totalisation would occur in
the Off-Peak register.
Operation 29