UnIT fUnCTIons
www.DaikinApplied.com 67 IOM 1206-7 • TRAILBLAZER
™
MODEL AGZ CHILLERS
Table 56: Stage Limits - Four Compressors
Demand Limit Signal
(%)
Demand Limit Range (mA) Stage
Limit ≥ 75% Limit ≥ 16 mA 1
75% > Limit ≥ 50% 16 mA > Limit ≥ 12 mA 2
50% > Limit ≥ 25% 12 mA > Limit ≥ 8 mA 3
25% > Limit 8 mA > Limit 4
Table 57: Stage Limits - Six Compressors
Demand Limit Signal
(%)
Demand Limit Range
(mA)
Stage
Limit ≥ 83.3% Limit ≥ 17.3 mA 1
83.3% > Limit ≥ 66.7% 17.3 mA > Limit ≥ 14.7 mA 2
66.7% > Limit ≥ 50% 14.7 mA > Limit ≥ 12 mA 3
50% > Limit ≥ 33.3% 12 mA > Limit ≥ 9.3 mA 4
33.3% > Limit ≥ 16.7% 9.3 mA > Limit ≥ 6.7 mA 5
16.7% > Limit 6.7 mA > Limit 6
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 Stage
Limit ≥ 100% 4
100% > Limit ≥ 75% 3
75% > Limit ≥ 50% 2
50% > Limit 1
Table 59: Stage Limits - Six Compressors
Network Limit Stage
Limit ≥ 100% 6
100% > Limit ≥ 83.3% 5
83.3% > Limit ≥ 66.7% 4
66.7% > Limit ≥ 50% 3
50% > Limit ≥ 33.3% 2
33.3% > Limit 1
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 congured 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.
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