Deltat - Daikin EWWQ-KC Operating Manual

Unit controller switches the pump frequency on the basis of:
1. Actual unit capacity
2. Double Speed digital input state
If there are no active compressors (Unit Capacity = 0%) pump speed is set to Standby Speed, otherwise Speed 1 is selected
depending on the Double Speed input state.

3.6.2. DeltaT

The third control mode is the DeltaT mode where the pump speed is modulated through a PID to ensure a constant difference
between Evaporator Entering Water Temperature and Evaporator Leaving Water Temperature.
This mode is regulated by following setting:
▪
Evaporator DeltaT in Cool Mode
▪
Condenser Delta T in Heat Mode
All settings related to pump management are available in the menu [8].
Menu Parameter
08 00
(Recirculation time)
01
(Standby Speed)
02
(Evap pump Speed)
03
(Max Speed)
04
(Min Speed)
05
(Sp Speed1)
06
(Parameter-K)
07
(Evap Setpoint DeltaT)
08
(Evap Delta T)
09
(Evap Pump Run Hours 1)
10
(Evap Pump Run Hours 2)
11
(Evap Pump Mode)
12
(Evap Manual Speed)
13
Thermo
(Evap
Stanby Speed)
14
(Cond Stanby Speed)
15
(Cond Pump Speed)
16
(Cond Max Speed)
17
(Cond Min Speed)
18
(Cond Speed 1)
19
(Cond Parameter-K)
20
(Cond Setpoint DT)
21
(Cond Delta T)
22
(Cond Pump Run Hours)
23
ond Pump Mode
(C
24
ond Manual Speed
(C
25
(Cond Thermo
Stably Speed)
The path in the Web HMI interface for Pump Settings is "Main Menu à View/Set Unit à Pumps".
Delta T control must have both water probes at the evaporator inlet in order to operate. The path in the Web HMI interface
for EWT Sensor enabling is "Main Menu à Commission Unit à Configuration →Options".
D-EOMHP01501-22_00EN 12/29
Range Description
0-300 Minimum time required within flow switch has to be closed to allow unit
startup.
0-100 Pump speed with Unit Capacity = 0
0-100 Actual Evaporator feedback pump speed.
0-100 Maximum value for pump speed.
0-100 Minimum value for pump speed.
0-100 First target value for pump speed in Fixed Speed control conditions.
1-10 This value scales the PI algorithm parameters to obtain a faster response.
0-10 Evaporator Water Temperature difference setpoint.
0-10 Evaporator Delta temperature Between EWT and LWT
0-99999 Evaporator Operation Hours
0-99999 Evaporator Operation Hours
Auto/Manual Pump mode. This parameter allows to switch the control of the pump to a
fixed speed.
0-100 Manual Pump Speed. Pump speed when the manual mode is selected.
0-100
Pump Speed in Thermostat Off Unit condition
Off
0-100 Speed when there are no compressors running
0-100 Actual Condenser feedback pump speed.
0-100 Maximum value for pump speed.
0-100 Minimum value for pump speed.
0-100 Speed when the input Speed Switch is open
0-10 This value scales the PI algorithm parameters to obtain a faster response.
0-10 Condenser Water Temperature difference setpoint.
0-10 Condenser Delta temperature Between EWT and LWT
0-99999 Condenser Operation Hours
Auto/Manual Pump mode. This parameter allows to switch the control of the pump to a
)
fixed speed.
0-100 Manual Pump Speed. Pump speed when the manual mode is selected.
)
0-100
Pump Speed in Thermostat Off Unit condition
Off
R/W Psw
W 1
W 1
R 1
W 1
W 1
W 1
W 1
W 1
R 1
R 1
R 1
W 1
W 1
W 1
W 1
R 1
W 1
W 1
W 1
W 1
W 1
R 1
R 1
W 1
W 1
W 1