WaterFurnace CLW Chiller - Manual (Page 17)

17
CLW QUAD SERIES CHILLER INSTALLATION MANUAL
Power Fail Restart
• When the controller is first powered up, the outputs will
be disabled and delay timers reset to avoid a random
start or multiple compressors staring simultaneously.
Lead Compressor Start Delay Time
• The lead compressor Fixed-On-Delay-Time that will
ensure that the lead compressor output is not enabled
for 120 seconds after the control receives a call to start
the unit and the lead compressor.
• This delay is not adjustable.
Lag Compressor Start Delay Time
• The lag compressor Fixed-On-Delay-Time will ensure
that the lead compressor output is not enabled for 5
minutes after the control receives a call to start the
lead compressor.
• This delay is adjustable from 60 – 3600 seconds over a
BAS or a local display.
Compressor Minimum On Delay
• There is no compressor minimum on time safety but in
adjusting the on off dead band for any given site no
compressor should never be enabled for less than two
(2) minutes each time the compressor output is enabled.
Compressor Minimum Off Delay Time
• The compressor minimum time delay will ensure
that the compressor output will not be enabled for a
minimum of ten (10) minutes after it is disabled.
• This allows for the system refrigerant pressures to
equalize after the compressor is disabled.
• This delay is adjustable from 480 - 1200 over a BAS or
a local display.
Compressor Lead/Lag
• Compressor lead/lag is a standard part of the
system. The unit is shipped from the factory with lead/
lag disabled.
• Lead/lag can be activated through the unit from the
user interface.
Modes
• The flowing modes are supported. Optional dual 6-pipe
rack* or local valves are required to implement many of
the modes
• Heating Only Cycle
• Cooling Only Cycle
• Simultaneous Heating and Cooling*
• Fixed Building Heating and Cooling*
• Primary Heating Secondary Cooling*
• Primary Cooling Secondary Heating*
• Free Cooling*
Fault History
• If a fault occurs the fault will be recorded and
displayed on the local display and an enumerated
status is available for the BAS.
• Optional trending and archiving solutions are available.
• Control Accessories and Options
• Local 7” user display
• Local 7” user display and Web pages
• Local 17” touch Screen and SQL Database
Sequence of Operation