Daikin Trailblazer AGZ030-101E Installation, Operation And Maintenance Manual page 76

Demand Limit
The maximum unit capacity can be limited by a 4 to 20 mA
signal on the Demand Limit analog input. This function is
only enabled if the Demand Limit set point is set to ON. The
maximum unit capacity stage is determined as shown in the
following tables:
Table 56: Stage Limits - Four Compressors
Demand Limit Signal Demand Limit Range (mA) Stage
(%)
Limit ≥ 75% Limit ≥ 16 mA
75% > Limit ≥ 50% 16 mA > Limit ≥ 12 mA
50% > Limit ≥ 25% 12 mA > Limit ≥ 8 mA
25% > Limit 8 mA > Limit
Table 57: Stage Limits - Six Compressors
Demand Limit Signal Demand Limit Range
(%) (mA)
Limit ≥ 83.3% Limit ≥ 17.3 mA
83.3% > Limit ≥ 66.7% 17.3 mA > Limit ≥ 14.7 mA
66.7% > Limit ≥ 50% 14.7 mA > Limit ≥ 12 mA
50% > Limit ≥ 33.3% 12 mA > Limit ≥ 9.3 mA
33.3% > Limit ≥ 16.7% 9.3 mA > Limit ≥ 6.7 mA
16.7% > Limit 6.7 mA > Limit
Network Limit
The maximum unit capacity can be limited by a network signal.
This function is only enabled if the control source is set to
network. The maximum unit capacity stage is based on the
network limit value received from the BAS and is determined
as shown in the following tables:
Table 58: Stage Limits - Four Compressors
Network Limit
Limit ≥ 100%
100% > Limit ≥ 75%
75% > Limit ≥ 50%
50% > Limit
Table 59: Stage Limits - Six Compressors
Network Limit
Limit ≥ 100%
100% > Limit ≥ 83.3%
83.3% > Limit ≥ 66.7%
66.7% > Limit ≥ 50%
50% > Limit ≥ 33.3%
33.3% > Limit
IOM 1206-13 • TRAILBLAZER
1
2
3
4
Stage
1
2
3
4
5
6
Stage
4
3
2
1
Stage
6
5
4
3
2
1
MODEL AGZ CHILLERS
®
Maximum LWT Pulldown Rate
The maximum drop rate for the leaving water temperature shall
be limited by the Maximum Pulldown Rate set point only when
the unit mode is Cool or Cool with Glycol.
If the rate exceeds the set point, no more compressors can
be started until the pulldown rate is less than the set point.
Running compressors will not be stopped as a result of
exceeding the maximum pulldown rate.
High Ambient Limit
On units configured with single point power connections, the
maximum load amps could be exceeded at high ambient
temperatures. If the power connection is single point, and the
outdoor air temperature OAT is greater than 46.6°C (115.9°F),
the high ambient limit becomes active. This limit will be
removed when the OAT drops back down to 45.56°C (114°F).
The max operating ambient temperature is 51.6°C (125°F).
When the limit is active, the unit is allowed to run all but one
compressor. So it will inhibit the unit from loading if all but one
compressor is on, and it will shut down a compressor if all
compressors are running.
RapidRestore
®
RapidRestore is an option that can be added to Trailblazer
®
chillers. The general purpose of the option is to allow the
capability to restart more quickly and to load faster than normal
operation.
Enabling
The RapidRestore ® option is be enabled via the RapidRestore
set point on the Unit Configuration screen and requires the
optional module. Doing so will require the following to be true:
• RapidRestore module is present at address 22
®
• DI1 on the RapidRestore
If the DI1 input loses the signal or the RapidRestore
is no longer communicating, then the option will be disabled in
the chiller.
When the RapidRestore Enable input is on, RapidRestore
is enabled. When the Backup Chiller input is on, the Backup
Chiller portion of the operation is enabled.
Operation Following Power Cycle
The chiller will enter RapidRestore
the following conditions are met:
• RapidRestore is enabled
®
• Power failure lasts less than the value of the Max Power
Failure Time set point
• Power failure lasts at least one second (shorter power
loss may result in unpredictable operation)
• Unit is enabled
• LWT ≥ Stage Up Temperature
When RapidRestore is triggered, the time value used for the
®
76
Unit Functions
Option
module has a signal
®
module
®
upon powering up when
®
www.DaikinApplied.com
™
®
®