Carrier 30WI Manual page 71

11 - MANAGEMENT OF THE WATER PUMPS
P240.6: Pump 1, boost mode max. speed
P 2 4 0 . 6
B O O S T
P240.7: Pump 1, STANDARD mode min. speed
P 2 4 0 . 7
S E R
Note: The minimum speed setpoint must be set based on the specifications for the pump and the minimum acceptable flow
rate for the evaporator (water flow safety device cut-off)..
P240.8: Pump 1, STANDARD mode max. speed
P 2 4 0 . 8
P U M P
11.5.4 - PUMP 1 reading :
P580: Pump 1 speed variation mode
P 5 8 0
M O D E
P581: Pump 1 speed
P 5 8 1
11.5.5 - Operating principle :
- The controller provides one 0-10 V signal so that it can actuate the pump installed by the customer on the indoor circuit (one
pump).
- The pump is actuated based on the temperature difference between the evaporator water outlet in COOLING control mode; in
heating mode, a fixed speed set by the parameter P240.9 is imposed on the pump.
- The control will return the pump speed value (in %) using a PID controller, based on the control mode selected.
- The speed value calculated in % by the controller is converted into an analogue signal (0/10V) to control the pump.
- A PID loop is applied to control the analogue outputs.
- The default sampling frequency of the PID is 1 second.
- The PID can be configured and must be adapted for each site.
11.5.6 - Water pump control :
► In COOLING mode :
- Pump 1 is actuated by the evaporator ΔT.
► In HEATING mode :
The speed of pump 1 is set at the value configured using the parameter P240.9.
- The actuation of the 0/10V signal for pump 1 is identical to that for the pump 1 binary outputs for water-towater machines.
- Conditions, pump OFF, 0V signal; conditions pump ON, control of the ΔT in PID.
- The pump is started with an actuation voltage of 10V.
- The PID algorithm for managing the ΔT only produces an action 10 s after being triggered and 60 s after a thermodynamic control
stage is stopped.
- In the event of a cut-out on the water flow rate safety, the min. voltage which can be imposed on pump 1 in COOLING mode is
that stored before the cut-out +10%; a message is sent on the console.
To enable this, the actuation voltage for the pump is stored before a control stage is stopped.
P U M P
- To ensure the minimum flow rate value accessible by the pump is that set by the parameters P240.7 once more, go into the
parameter, modify the value if necessary, and confirm with the OK key.
A change in the operating mode (HEATING/COOLING) also cancels the override function.
The values CONS (setpoint) and MOTOR will then be the same.
11.5.7 - Boost mode :
- The control for the indoor pump (pump 1) is forced to boost mode max speed in HEATING mode if there is a HP cut-off and in
COOLING mode if there is a frost protection cut-off.
- The pump output speed will always be between the values set in the parameters P240.7 and P240.8 in both Normal and Boost
mode.
M A X
M O D E
M I N I
P T : X X X %
M A X I
1
S P E E D
P U M P
P U M P
F O R C E D M I N I
X
S P E E D
P U M P 1
S P E E D
M O T O R : x x x %
S P E E D
V A R I A B L E
1
1 S P E E D
S P E E D
1 0 0 %
P 1
0 %
B O O S T
x x x %
x x x %
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