Controls
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CenTraVac
® Unit Control Panel |
The CenTraVac Unit Control Panel
incorporates the following features and components.
Control Functions
Constant Evaporator Leaving Fluid
Temperature
Current Limit/Demand Limit
Condenser Limit
Softloading
Hot Gas Bypass (optional)
Leaving Condenser Water Temperature
(programmable setting) heat pump only (optional)
Ability to Control with Varying Water
Loop Flow
Heat Recovery Temperatures (optional)
Constant Entering Fluid Temperature
(programmable setting)
Variable Speed Drive (optional drive
with adaptive tuning for safe operation and maximum efficiency)
Loss of Load for Sudden Load Loss
(nuisance trip prevention)
Note: capacity control can be accomplished in several ways: entering or leaving evaporator fluid temperature,
leaving condenser water temperature.
Machine Protections
Starter
Compressor Contactor Failure Detection
Solid-state starter heat sink
(included with SSS)
Compressor
Smart Shutdown Sequence
High Compressor Discharge Temperature (optional)
Surge Detection
Extended Surge Protection
Oil Temperature
Bearing Temperatures Low Differential
Pressure (optional)
Condenser
Loss of flow
High condenser pressure limit
High pressure cutout
Evaporator
Loss of flow
Low refrigerant temperature limit
Low evaporator leaving fluid cutout
Motor
Current limit
Current overload
High motor winding temperatures
High vacuum operation lockout
Momentary power loss, phase unbalance, phase loss, reverse rotation. Over/under voltage is optional
Smart short cycling protection
Purge
Tank full protection
Low current detection
Continuous or excessive pumpout
detection
Excessive air leakage detection
Monitored Points
Chiller information is available at
the operator interface that can access a variety of reports: Custom, Chiller Refrigerant and Compressor.
Custom Report:
User Defined Custom Report (operator may choose up to 20 points — from a list of over 100 choices).
Chiller Report:
Status, Fluid Temperatures and Setpoints
- ASHRAE Guideline 3 Report
- operating mode (i.e. run status)
- setpoint source or reset source
- evaporator leaving fluid temperature
setpoint
- evaporator entering and leaving fluid
temperatures
- condenser water entering and leaving
water temperature
- current limit setpoint
- evaporator flow and condenser flow
(optional)
- outdoor temperature (optional)
- fluid or water pressure drops
(optional) evaporator and condenser
- active ice-making setpoint (if applicable)
- active hot water setpoint (if applicable)
- auxiliary heat recovery temperature
(if applicable)
Refrigerant Report:
Refrigerant Temperatures and Pressures
- ppm of refrigerant from multiple
points outside of machine
- saturated condenser temperature
- condenser pressure
- saturated evaporator temperature
- evaporator pressure
- compressor discharge temperature
(optional)
- purge suction temperature
- purge elapsed time
- pumpout activity
Compressor Report
- starts and hours counters
- phase currents
- phase voltages (optional)
- oil temperature and flow
- motor winding temperature
- bearing temperatures (optional)
- kilowatts/power factor (optional)
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