Daikin Pathfinder AWV Installation, Operation And Maintenance Manual page 60

RapidRestore
®
The option allows the capability to restart more quickly and to
load faster than normal when power is lost and restored.
Enabling
Changing the RapidRestore
the following to be true:
• RapidRestore ® module is present at address 22
• DI1 on the RapidRestore
If any of the above are no longer true, the RapidRestore
point will be changed to Disable.
Operation Following Cycling of Power
The chiller will enter RapidRestore
the following conditions are met:
• RapidRestore ® is enabled
• Power failure lasts less than the value of the Max Power
Failure Time set point
• Power failure lasts at least one second
• Unit is enabled
• LWT Error is at least equal to the Stage Up Delta T set
point
RapidRestore will end if any of the following conditions occur:
®
• LWT Error is less than the Stage Up Delta T set point
• Unit capacity = 100%
• All circuits become disabled for any reason
• Unit becomes disabled for any reason
• 10 minutes have passed since unit powered up
Unit Level Changes
During RapidRestore operation, unit capacity control logic
®
allows both circuits to start simultaneously.
In the event that both circuits do not start simultaneously, the
requirement for the running circuit to reach maximum capacity
will be ignored for staging the other circuit on.
Circuit Level Changes
When RapidRestore ® is triggered, all compressor cycle timers
are cleared to allow for starting more quickly. The limit of four
starts per hour will remain in effect and will not be cleared by
triggering RapidRestore .
®
Waterside Economizer
The waterside economizer (WSE) option will be considered
available if the following conditions are all true:
• Waterside Economizer Option set point = Yes
• Waterside Economizer Enable DI is on
• Waterside Economizer Enable set point = Yes
• If Control Source = Network and it is NOT configured
with LON, then BAS Waterside Economizer Command =
IOM 1242-8 • PATHFINDER
set point to Enable will require
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module has a signal
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upon powering up when
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MODEL AWV CHILLERS
®
Enable
• WSE EWT sensor fault alarm, WSE Valve Problem alarm,
and WSE Valve Fault alarm are not active
• Unit Mode = Cool
NOTE: WSE parameters are not available on LON, so the
BAS WSE Command setting cannot be set with LON
and therefore must be ignored.
When the WSE loop is active, WSE Capacity =
[(Cir 1 Num Fans Running – 1) + (Cir 1 Fan Speed ÷ 100) +
(Cir 2 Num Fans Running – 1) + (Cir 2 Fan Speed ÷ 100)] /
set Total Number of Fans
®
WSE Cooling States
Off: No cooling is being provided
Waterside Economizer: Only cooling via waterside
economizer is provided
Hybrid Cooling Pulldown: Cooling via both mechanical
cooling and waterside economizer are being provided, during
loop pulldown phase of run cycle
Hybrid Cooling Modulation: Cooling via both mechanical
cooling and waterside economizer are being provided, after
loop has been pulled down.
Mechanical Cooling: Only cooling via mechanical cooling is
being provided
Operation in Off State
When cooling state is Off:
• Waterside Economizer Valve 1 should be fully open.
• Waterside Economizer Valve 2 should be fully closed.
• No condenser fans will run.
• No compressors will run.
Operation in Waterside Economizer State
When cooling state is Waterside Economizer:
• Waterside Economizer Valve 1 should be fully closed.
• Waterside Economizer Valve 2 should be fully opened.
• Condenser fans may be running for the purpose of WSE
only.
• No compressors will run.
Operation in Hybrid Cooling - Pulldown State
When cooling state is Hybrid Cooling – Pulldown:
• Waterside Economizer Valve 1 should be fully closed.
• Waterside Economizer Valve 2 should be fully opened.
• Condenser fans may be running for the primary purpose
of condenser pressure control on a circuit running
a compressor. Any WSE effect from running fans is
secondary.
• One or both compressors may be running.
Fans on a circuit running the compressor should operate the
60
Unit Functions
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