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)