Ak-Pc 782B High Ejector Control Settings - Danfoss ADAP-KOOL AK-PC 782B User Manual

User Guide | Testing and startup guide, type AK-PC 782B
11. AK-PC 782B high ejector
control settings
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Open ST500, press , then select "Setpoint management". Press the "+" icon to move to "HP control"
page.
Control mode = auto means the pack controller is staging the ejectors. Man is mainly used for testing
purposes and allows the user to de ne a percentage from 0 – 100 (remember to change this setting
back to auto! The man settings remain forever).
Pgc neutral zone = this setting straddles Pgc max. Setting to determine when to activate and de-
activate ejector stages. This prevents excessive cycling of ejector solenoids.
Example: Pgc max. = 1350 psi, Pgc neutral zone = 43 psi, ejectors staging will increase at 1371 psi and
descrease at 1329 psi
Ejector 1 cycle = total number of time that ejector 1 has been activated since the last time the pack
controller was power cycled.
Cycle rate: an ejector valve should not disconnect more than once/minute over.
An average of 24 hours. The setting Pgc neutral zone described above can be used to slow down
ejector cycling. Increasing Pgc neutral zone reduces number of cycles
Wiring note: ejectors solenoids wire to solid state relay outputs.
General operation: ejectors operate in a similar fashion as condenser fans. As the gas cooler psi
increases, additional ejectors will activate. When the gas cooler psi decreases, ejectors will de-activate.
The pack controller will stage ejectors in random order when needed to keep the cycle counts
relatively close to each other.
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