Daikin AGZ065E - Evaporator Pump Control

IOM 1206-7 • TRAILBLAZER
™
MODEL AGZ CHILLERS 64 www.DaikinApplied.com
UnIT fUnCTIons
Unit Status
The displayed unit status should be determined by the
conditions in the following table:
# Status Conditions
1 Auto Unit State = Auto
2 Auto: Sound Reduction
Unit State = Auto and Sound
Reduction is active
3 Off: Motor Prot Delay
Unit State = Auto and MP start
up delay is active
4 Off: Ice Mode Timer
Unit State = Off,
Unit Mode = Ice, and
Ice Delay = Active
5 Off: Low OAT Lockout
Unit State = Off and Low OAT
Lockout is active
6 Off: All Cir Disabled
Unit State = Off and both circuits
unavailable
7 Off: Unit Alarm
Unit State = Off and Unit Alarm
active
8 Off: Keypad Disable
Unit State = Off and Unit Enable
Set Point = Disable
9 Off: Remote Switch
Unit State = Off and Remote
Switch is open
10 Off: BAS Disable
Unit State = Off, Control Source
= Network, and BAS Enable =
false
11 Off: Unit Switch
Unit State = Off and Unit Switch
= Disable
12 Off: Test Mode
Unit State = Off and Unit Mode
= Test
13 Auto: Wait for load
Unit State = Auto, no circuits
running, and LWT is less than
the active set point + startup
delta
14 Auto: Evap Recirculate
Unit State = Auto and
Evaporator State = Start
15 Auto: Wait for ow
Unit State = Auto, Evaporator
State = Start, and Flow Switch
is open
16 Auto: Pumpdown Unit State = Pumpdown
17 Auto: Max Pulldown Rate
Unit State = Auto, max pulldown
rate has been met or exceeded
18 Auto: Unit Cap Limit
Unit State = Auto, unit capacity
limit has been met or exceeded
19 Auto: High Amb Limit
Unit State = Auto and high
ambient capacity limit is active
20 Auto:Rapid Restore
Unit State = Auto and unit is
performing Rapid Restore
operation
21 Off:Cond Type Not Set
Condenser type setting is set to
‘Not Set’
22 Off:ExVlv Type Not Set
Expansion valve type setting is
set to ‘Not Set’
23 Off:Invalid Cong Unit model selected not valid
24 Cfg Chg, Rst Ctlr
A conguration change requiring
a reboot 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.
T1 – Off to Start
Requires any of the following
• Unit state = Auto
• Freeze protection started
T2 – Start to Run
Requires the following
• Flow ok for time longer than evaporator recirculate time
set point
T3 – Run to Off
Requires all of the following
• Unit state is Off
• Freeze protection not active
T4 – Start to Off
Requires all of the following
• Unit state is Off
• Freeze protection not active
T5 – Run to Start
Flow switch input is low for longer than the ow proof set
point.
STAR
T
RUN
3
5