Daikin McQuay AGZ-D 25, Operating And Maintenance Manual

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28 AGZ 025D through 190D OMM 1087-1
Six Compressors:
Demand Limit Signal (%) Demand Limit (mA) Stage Limit
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 ≥ 12mA
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:
Four compressors:
Network Limit Stage Limit
Limit ≥ 100%
4
100% > Limit ≥ 75%
3
75% > Limit ≥ 50%
2
50% > Limit 1
Six compressors:
Network Limit Stage Limit
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 rate at which the leaving water temperature can drop shall be limited by the Maximum
Pulldown Rate set point, only when the unit mode is Cool.
If the rate exceeds this set point, no more compressors shall 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 all compressors are running on circuit 1 or all but one compressor on circuit 1,
power connection is single point, and the outdoor air temperature OAT is greater than 46.6°C (115.9°F),
circuit 2 is limited to running all but one compressor. This limit will allow the unit to operate at higher
temperatures than 46.6°C (115.9°F).