Daikin EWAP400MBYN [291/452] Priority management
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Daikin EWAP400MBYN [291/452] Priority management

Daikin EWWD180MBYNN [291/452] Priority management
ESIE05-07 The Functional Controller for DICN
Part 2 – Functional Description 2–95
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2
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3.12 Priority Management
Introduction This function determines the priority of each unit in a master slave setup.
Basic rules:
P Load-up as fast as possible.
P Use as less possible units.
The following items determine the priority:
P Standby function.
P Load-up or load-down request. Possibility evaluated according to: outlet water temp, unit priority,
unit running, unit offset.
Standby function This function determines which unit will be used as standby unit.
How to determine which unit is set in standby mode
The standby unit will be needed if:
P All units are operating at 100% capacity.
P All units are operating at 100% capacity and the standby unit is not at 0% request capacity.
P A unit safety is present on a unit.
P A circuit safety is present on a unit.
P The "DICONNECT ON/OFF" mode is selected on a unit.
Determine priority
for each unit
according to
1. Load-up requested
Remark: Steplength value = 1.5
If only one unit is in “STANDBY” mode This unit will be the standby unit.
If more than one unit is in “ STANDBY” mode The standby unit will be the one with capacity
step 0% and with the highest Running
hours-Offset.
LOW Priority High Priority
1. Unit Loadup possible
No loadup possible Loadup possible
2. Unit Outlet water
temperature
Outlet temp(unit) < MOW +
steplPriority *steplength
Outlet temp(unit) ≥ MOW +
step 1 Priority * steplength
3. Unit priority 0
(lowest priority)
12 3
(highest priority)
4. Units that are already
running
Unit capacity step = 0 Unit capacity step<>0
5. unit offset (running
hours-RHOffset)
Highest (running
hours-RHOffset )
> > Smallest (run-
ning hours-
RHOffset)
ESIE05-07.book Page 95 Wednesday, October 11, 2006 10:42 AM

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