Potterton Gas condensing boiler Installation, Operation And Maintenance Manual page 76

Programming
Boost heating
(770, 1070, 1370)
Quick setback
(780, 1080, 1380)
76
The boost heating is active if the room set point is switched from protection
mode or reduced mode to comfort mode. During the boost heating the the room
set point is increased to the value set here. This causes the actual room tempera-
ture to increase to the new set point within a short period of time. The boost
heating is ended if the room temperature measured with a RGT/RGTF or RGB
room unit increases to 0.25 °C below the comfort set point.
Without room sensor or without room influence the boost heating is carried out
based on an internal calculation. Due to the room set point acting as a basis, the
effect of the duration of the boost heating and that of the flow temperature
works differently for each outside temperature.
Fig. 15: Boost heating
TRw Room temperature setpoint
TRx Room temperature actual value
DTRSA Room temperature set point-raised
The quick setback is active if the room setpoint is switched from comfort level to
another operating level (selected between reduced mode or protection mode).
During the quick setback the heating circuit pump is turned off and the mixing
valve is also closed during mixing circuits. During the quick setback no heat re-
quirement is sent to the heat generator.
The quick setback is possible with or without room sensor: with room sensor the
heating circle function is switched off as long as the room temperature has drop-
ped to the reduced setpoint or frost protection setpoint. If the room temperature
has dropped to the reduced setpoint or the frost protection setpoint, the heating
circuit pump is switched on again and the mixing valve is released. Without the
room sensor the quick setback switched the heater off depending on the outside
temperature and the building time constant (prog.no. 6110) as long as the tem-
perature has theoretically dropped to the reduced target value or the frost protec-
tion value.
2 ) accessories
Paramount three 30-115 kW
TRSPR
396532 05.11
2)