Liquid Line Solenoid Valve; Hot Gas Bypass Solenoid Valve; Capacity Overrides - Limits Of Operation; Alarms - Daikin AGZ 025D Operating & Maintenance Manual

Liquid Line Solenoid Valve

The liquid line solenoid output should be on when
the circuit state is either Pre-open or Run. This
output should be off at all other times.

Hot Gas Bypass Solenoid

Valve
This output shall be on when circuit state is Run
and one compressor on the circuit is running. The
output should be off at all other times.
Capacity Overrides – Limits
of Operation
The following conditions shall override automatic
capacity control as described.

Alarms

Situations may arise that require some action from
the chiller or that should be logged for future
reference. Alarms are classified in the following
sections per the Global Chiller Protocol Standard
using the Fault/Problem/Warning scheme.
When any Unit Fault Alarm is active, the alarm
digital output should be turned on. If no Unit

Unit Fault Alarms

PVM/GFP Fault
Trigger: Power Configuration = Single Point and PVM/GFP Input #1 is open.
Action Taken: Rapid stop all circuits
Reset: Auto reset when input is closed for at least 5 seconds or if Power Configuration = Multi Point.
Evaporator Flow Loss
Trigger:
1: Evaporator Pump State = Run AND Evaporator Flow Digital Input = No Flow for time > Flow Proof Set
Point AND at least one compressor running
2: Evaporator Pump State = Start for time greater than Recirc Timeout Set Point and all pumps have been
tried and Evaporator Flow Digital Input = No Flow
Action Taken: Rapid stop all circuits
Reset:
This alarm can be cleared at any time manually via the keypad or via the BAS clear alarm command.
If active via trigger condition 1:
When the alarm occurs due to this trigger, it can auto reset the first two times each day with the third
occurrence being manual reset.
OMM 1166-1
These overrides
AGZ 025D through 190D
keep the circuit from entering a condition in which
it is not designed to run.
Low Evaporator Pressure
If the Low Evaporator Pressure Hold or Low
Evaporator Pressure Unload alarms are triggered,
the circuit capacity may be limited or reduced.
See the Circuit Events section for details on
triggering, reset, and actions taken.
High Condenser Pressure
If the High Condenser Pressure Unload alarm is
triggered, the circuit capacity may be limited or
reduced. See the Circuit Events section for details
on triggering, reset, and actions taken.
Fault Alarm is active, but any Circuit Fault Alarm
is active, the alarm digital output should alternate
five seconds on and five seconds off continuously.
All alarms appear in the active alarm list while
active. All alarms are added to the alarm log
when triggered and when cleared.
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