Daikin AGZ 160D - Unit Status Conditions and Evaporator Pump Control; Unit Status Definition Details; Evaporator Pump Control States and Transitions

24 AGZ 025D through 190D OMM 1166-1
Enum
Status
Conditions
6
Off:Keypad Disable
Unit State = Off and Unit Enable Set Point = Disable
7
Off:Remote Switch
Unit State = Off and Remote Switch is open
8
Off:BAS Disable
Unit State = Off, Control Source = Network, and BAS Enable =
false
9
Off:Unit Switch
Unit State = Off and Unit Switch = Disable
10
Off:Test Mode
Unit State = Off and Unit Mode = Test
11
Auto:Wait for load
Unit State = Auto, no circuits running, and LWT is less than the
active set point + startup delta
12
Auto:Evap Recirc
Unit State = Auto and Evaporator State = Start
13
Auto:Wait for flow
Unit State = Auto, Evaporator State = Start, and Flow Switch is
open
14
Auto:Pumpdown
Unit State = Pumpdown
15
Auto:Max Pulldown
Unit State = Auto, max pulldown rate has been met or exceeded
16
Auto:Unit Cap Limit
Unit State = Auto, unit capacity limit has been met or exceeded
17
Auto: High Ambient Limit
---
18
Config Changed, Reboot
Required
A configuration change requiring a reboot has occurred but
controller has not been rebooted yet.
Evaporator Pump Control
For control of the evaporator pumps, three evaporator pump control states should be used:
Off - No pump on.
 Start – Pump is on, water loop is being recirculated.
 Run – Pump is on, water loop has been recirculated and circuits can start if needed.
Transitions between these states are shown in the following diagram.
OFF
STARTRUN
T
3
T2
T
4
T
1
POWER
ON
T5
T1 – Off to Start
Requires any of the following
 Unit state = Auto
 LWT is less than the Evap Freeze set point – 0.6°C (1.1°F) and LWT sensor fault isn’t active
T2 – Start to Run
Requires the following
 Flow ok for time longer than evaporator recirculate time set point