ARTC-SVX013A-EN
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Table 10. HMI settings menu screens (continued)
Screen User Interface Function Access
Chiller Control
• Admin Level Chiller SP Control (see
“Special Functions,” p. 35).
• Display and adjust chiller PI Loop settings.
• Compressor staging control is a
differential control known as Low Urgency
Zone (LUZ) in this software. It has
separate positive and negative dead band
settings for both delta temperature and
timing.
Notes:
– While chiller operates within LUZ
limits, all control is via PI loop.
– If Control Signal is greater than
Chiller Setpoint + LUZ stage-in
setting for longer than LUZ Stage-in
time AND compressor power greater
than Power @ Max setting (See
Compressor Control Settings), then
stage in next compressor.
– If Control Signal drops below Chiller
Setpoint – LUZ Stage-out for longer
than LUZ stage-out time, then stage
out a compressor.
• Control Signal – The system provides the
following options for chiller control.
– EWT – The chiller controls to an
entering (or Return) water
temperature setpoint.
– LWT (Default) – The chiller controls to
a leaving water (Supply) temperature
setpoint.
– Hot – The chiller controls to a leaving
condenser water temperature
setpoint (Heat Recovery).
– TSuc – The chiller controls to a
suction temperature setpoint.
• DTC Multi-Start Delta Temp – When the
chiller is idle, enabled and looking to start,
it compares the LWT with setpoint, the
difference is divided by this parameter and
the integer value of this calculation is
added to the number of compressors to
start; i.e., Differential is 6.5, parameter is 3
– integer division yields a value of 2;
therefore, with a normal start of 1
compressor plus 2 from delta start yields 3
compressors start in this condition.
• Evaporator/Condenser DP/flow settings (if
applicable).
• Tonnage Calculation Configuration (see
“Special Functions,” p. 35).
Main Menu > Settings Menu >
Control
Safety
Display and adjust safety parameters.
Note: The compressors have their own safety
settings for fault and alarm. System
should be configured such that the
compressor settings have priority.
Main Menu > Settings Menu >
Safety
Operating Procedures
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