Carrier CCU - Free Cooling and Air Temperature Limits; Setpoint Shift and Air Flow Control; Pressure Control and Fan Speed Limitations; Air Temperature Control Parameters

6 - CONFIGURING THE UNIT
Access level No. Description Setting By default Display condition
FREE COOLING CONTROL
2 125
Free cooling activation
di󰀨erential
3 to 20 K 3 K P11 = 1
2 126
Free cooling activation low limit
setpoint
-5 to 20°C 0°C P11 = 1
2 128 Free cooling opening limit 0 to 100% 100% P11 = 1
2 129
External weight in water low
limit setpoint
0 to 15 g 4 g
P11 = 1 and
(P09>0 or
P10>0)
2 130
External weight in water high
limit setpoint
8 to 18 g 12 g
P11 = 1 and
(P09 >0 or
P10 > 0)
LIMITATION OF THE SUPPLY AIR TEMPERATURE
1 140 Low limit setpoint 5 to 30 °C 14°C
P06 = 1 and (P07 > 0 or P09 > 0)
1 141 Proportional band for the low limit 1 to 20 K 4 K P06 = 1 and (P07 > 0 or P09 > 0)
1 142 High limit setpoint 30 at 60°C 50°C P06 = 1 and P08 > 0
1 143
Proportional band for the high
limit
1 to 20 K 4 K P06 = 1 and P08 > 0
TEMPERATURE SETPOINT SHIFT
2 144 Cooling setpoint o󰀨set 0 to 30 K 5 K P31 > 0
2 145 Heating setpoint o󰀨set 0 to 20 K 5 K P32 > 0
AIR FLOW
2 146 Air ow rate setpoint 4000 to P40 m³/h 1000 m³/h P02 = 17
2 147 Air ow rate proportional band 100 to 50000 m³/h 6000 m³/h P02 = 17
2 148 Air ow rate integration time 0 to 1800 s 0 s P02 = 17
2 149 Air ow rate derivation time 0 to 1800 s 0 s P02 = 17
FLOOR PRESSURE
2 150 Discharge pressure setpoint 20 to 250 Pa 100 Pa P2 = 15
2 151
Discharge pressure
proportional band
20 to 1000 Pa 50 Pa P2 = 15
2 152
Discharge pressure integral
time
0 min 0 s to 30 min 0 s (0 to 1800 s) 3 min 0 s P2 = 15
2 153
Discharge pressure derivative
time
0 min 0 s to 30 min 0 s (0 to 1800 s) 3 min 0 s P2 = 15
LIMITING THE POWER OF THE GRADUAL ELECTRIC HEATER
2 154
Electric heater maximum
percentage
0 to 100% 100%
(P08 = 2 or 3) and (P16 = 3 or 4)
LIMITATION OF THE FAN ROTATION VARIABLE SPEED CONTROL
2 155
Percentage of the rotation
speed
P156 to P157 (P156+P157)/2
2 156
Minimum percentage of the
rotation speed
0 to 90 % if P08 = 0 or 1 and P10 = 0
50 to 90% if P08 > 1 or P10 > 0
60% P02 > 9
2 157
Maximum percentage of the
rotation speed
P156 to 100% 100% P02 > 9
2 158
Percentage of proportional
bands reserved for controlling
just the valves
0 to 100% 50 % P02 = 10 to 13
RETURN/SUPPLY AIR TEMPERATURE CONTROL
2 159
Return/supply air temperature
di󰀨erential setpoint
5,0 to 20,0 °C 10,0 °C P2 = 16
2 160
Return/supply air temperature
proportional band
1,0 to 10,0 °C 2,0 °C P2 = 16
18