Leaving Water Temperature (Lwt) Reset - Daikin MICROTECH III Operating Manual

7.10.2 Pressure condensation control
Refer to Circuit Functions.

7.11 Leaving Water Temperature (LWT) Reset

7.11.1 LWT Target
The LWT Target varies based on settings and inputs and is selected as follows:
Control Source
Set Point
Local
Local
Network
Local
Local
Network
Local
Local
Network
Network
Local
Network
Local
Local
Network
7.11.2 Leaving Water Temperature (LWT) Reset
The base LWT target may be reset if the unit is in Cool or Heat mode and it is configured for a reset. The type of reset to
be used is determined by the LWT Reset Type set point.
When the active reset increases, the Active LWT Target is changed at a rate of 0.05 °C every 10 seconds. When the active
reset decreases, the Active LWT Target is changed all at once.
After resets are applied, the LWT target can never exceed a value of 15°C.
Reset Type – None
The Active Leaving Water variable is set equal to the current LWT set point.
Reset Type – Return
The Active Leaving Water variable is adjusted by the return water temperature.
LWT set Point+Max Reset
(54)
Active
Max Reset
LWT
(10)
o
( F)
LWT Set Point
(44)
The active set point is reset using the following parameters:
1. Cool LWT set point
2. Max Reset set point
3. Start Reset Delta T set point
4. Evap Delta T
D–EOMWC00A07-16_02EN
Mode HP
Input Switch Request
OFF OFF
ON OFF
X OFF
OFF OFF
ON OFF
X OFF
OFF OFF
ON OFF
x OFF
x OFF
x OFF
x OFF
OFF ON
ON ON
X x
Return Reset
0
Start Reset Delta T
Evap Delta T (
BAS Available Modes
Set Point
X COOL
X COOL
COOL COOL
X COOL w/Glycol
X COOL w/Glycol
X COOL w/Glycol
x COOL/ICE w/Glycol
x COOL/ICE w/Glycol
COOL COOL/ICE w/Glycol
ICE COOL/ICE w/Glycol
x ICE w/Glycol
x ICE w/Glycol
X HEAT
X HEAT
HEAT HEAT
o
F)
Operation Manual
Base LWT Target
Cool Set Point 1
Cool Set Point 2
BAS Cool Set Point
Cool Set Point 1
Cool Set Point 2
BAS Cool Set Point
Cool Set Point 1
Ice Set Point
BAS Cool Set Point
BAS Ice Set Point
Ice Set Point
BAS Ice Set Point
Heat Set Point 1
Heat Set Point 2
BAS Heat Set Point
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