Honeywell EXCEL 5000 User Manual page 167

EXCEL CARE CONTROL ICONS
Occupied/ Un-occupied Period
P4 Minimum outdoor temperature for early setback
P5 Preheat time for 0°C
P6 Optimum stop factor
P7 Room comfort zone optimum stop
P8 Dead time short
P9 Time constant short
P10 Dead time long
P11 Time constant long
P12 Building model adaption enable
0 = disable
1 = enable
2 = restart
P13 Room control P-band
P14 Room control integral action time
P15 Maximum supply water temperature
P16 Heating curve curvature
P17 Heating curve slope
P18 Heating curve maximum slope
P19 Heating curve adaption mode
0 = disable
1 = enable
2 = new start
3 = refresh new start (outdoor temperature dependent)
4 = direct room temperature compensation
P20 Occupied/ unoccupied changeover
P21 Frost protection limit
P22 Boost factor
P23 Room temperature compensation
P24 Minimum room temperature
P25 Minimum room temperature hysteresis
With the parameter P20 occupied / un-occupied changeover, you can decide
whether you want to run the heating circuit with night setback or with total cool-
down. If the room temperature setpoint is higher or equal than P20, the flow
temperature is controlled by the room temperature setpoint using the heating curve;
otherwise it is set to 0.
TSup = Heating Curve Setpoint + P23*F
Heating Curve Setpoint = HC (TSet +/- Toff (CPA), TOat, P15, P16)
TSup = 0, for total cool down
F = 1; if P19 = [4]
ADAPT
F = 0; if P19 = [0;1;2;3]
ADAPT
Total cool-down is possible only if one of the following conditions is true:
1. No room temperature connected.
There is total cool-down if the filtered outside air temperature is above the limit
frost protection P20. Below the outside air temperature limit frost protection,
normal outside air temperature compensated control with night set-back will be
performed. For total cool-down the room temperature setpoint has to be lower
than the setting P20.
2. A room temperature sensor is configured.
With a room temperature sensor, the heating circuit will always be switched off
during un-occupied periods. If the room temperature falls below the room
temperature setpoint defined by the time schedule, minimum room temperature
protection will be performed (see section "Minimum Room Temperature
Protection").
169
ALPHABETIC REFERENCE
(TSet +/- Toff(CPA) - TRm)
ADAPT*
EN2B-0184 GE51 R0518 (Europe)
74-5577–33 (US)