Daikin EWTP140MBYN [243/452] Floating setpoint ambient mode

ESIE05-07 Functional Control for a Standalone Unit

Part 2 – Functional Description 2–47

2.12 Floating Setpoint - Ambient Mode

Introduction The ambient mode can be used to modify the setpoint in function of the ambient temperature.

The user is able to choose to use the floating setpoint or not. The result of using the ambient mode is

that the unit will be used more efficiently and that the modified setpoint will be displayed under the

normal setpoint.

The floating setpoint parameters and function can be set in the user settings menu.

Applicable units This function is active in cooling and heating, for units with an ambient sensor present.

Function

description

1 Source of the floating setpoint outdoor temperature = floating source.

2 A reference at which the floating setpoint value is equal to zero = ambient zero (zero on screen ).

3 A reference at which the floating setpoint value is maximum = ambient - 10°.

4 The maximum floating setpoint value = max value (max. value on screen).

Remark: the default and limit values for this function are given in the chapter concerning the user

settings menu.

Explanation: When in cooling mode the load of the unit drops (by drop in outdoor temperature), then the setpoint

will be changed upwards by the floating setpoint value. Because of this the unit will evaporate at a

higher temperature and thus the performance of the unit will be better.

Remark: When you use the floating setpoint, the value of the setpoint on the readout and set point

menu can be different. The readout screen will show the calculated value and the setpoint screen the

set value.

1. Air-cooled 2. Evaporater-

less unit

3. Water-cooled

unit

4. Condenser-

less units

EWTP EWAP/EWAD ERAP EWWD EWLD

HR CO CA HP RC

Floating

setpoint

OO O -- O

Slope

def. 5°C

Value added

to active setpoint

Max. value

def. 3°C

Ambient tempAmbient zeroAmbient zero -10°C

For cooling

ESIE05-07.book Page 47 Wednesday, October 11, 2006 10:42 AM