Daikin EWWQ-KC, Operating Manual

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D-EOMHP01501-22_00EN 16/29
*Nominal DT is the difference between entering and leaving water temperature when the unit is operating at full capacity
with nominal plant water flow rate.
Parameter Description/Value
Control Temperature
Leaving Water Temperature
SP
Based on Leaving Water Temperature
Startup DT
7.7 dK (example with 5 °C of nominal flow rate and unit with 1 compressor)
Shutdown DT
1.7 dK (default value as described in previous chapter)
Nominal DT
Depends on Unit Mode, set it in 15.14, 15.15 parameters (Nominal Evap DT, Nominal Cond DT)
3.10. Unit Capacity
Information about the unit's current and individual circuit capacities can be accessed from menu Page [3].
Menu Parameter Range Description R/W
03 00
(
Circuit 1 Capacity )
0-100% Circuit 1 capacity in percentage R
01
(
Circuit 2 Capacity )
0-100% Circuit 2 capacity in percentage R
In the HMI Web Interface, some of this information is available in the paths:
•
Main Menu
→
View/Set Circuit
→
Circuit 1 (or Circuit 2)
→
Data
•
Main Menu → View/Set Circuit → Circuit 1 (or Circuit 2) → Compressors
3.11. Power Conservation
In this chapters will be explained the functions used to reduce the unit power consumption.
3.11.1. Setpoint Reset
The “Setpoint Reset” function can override the chiller water temperature active setpoint when certain circumstances occur. The
aim of this function is to reduce the unit energy consumption whilst maintaining the same comfort level. To this purpose, three
different control strategies are available:
•
Setpoint Reset by an external signal (0-10V)
•
Setpoint Reset by Evaporator/Condenser
ΔT (EEWT/CEWT)
The controlled Delta T is set in accord of actual unit mode: if unit is operating in Cool Mode, Evaporator Delta T will be considered
to activate Setpoint Reset, otherwise if it is operating in Heat Mode, Condenser Delta T will be considered to activate Setpoint
Reset.
In order to set the desired setpoint-reset strategy, go to the parameter group number [20
] “Setpoint Reset”, according to the
following table:
Menu Parameter Range Description R/W
18 00
(
Reset Type
)
0-2 0 = No W
1 = 0-10V
2 = DT