XC10/30CXControllers for Condensing UnitsPieve d’AlpagoOctober 2011

Controllers for Condensing Unit Applications

Controllers for Condensing Unit Applications

XC10/30CXXC10/30CX

XC10/30CXXC10/30CXApplicationsFor condensing units with:- 1 compressor (16A relay) - up to 2 fans (5A and 8A relays)*(*) only for XC30CX model

Trigger from external thermostat:- use an additional device (e.g. XR60CX) to monitor the system temperature - use the XC Thermostat digital input- the regulation is performed only when the input is active

XC10/30CXXC10/30CXTypical Condensing Unit Applications

No external trigger from thermostat:- use the suction and/or discharge pressure probe- alternatively can use NTC temperature probes instead of pressure probes- the regulation is performed until the system pressure reach the set value

XC10/30CXXC10/30CXTypical Condensing Unit Applications

Main features

- The first electronic controller for condensing unit

- Designed for condensing unit with a compressor and up to 2 fans

- Designed to replace electro-mechanical devices

- Controls based on suction pressure

- Fan cycling with mid coil temperature

- Discharge line protection

- Use of ratiometric pressure probes or NTC temperature probes

XC10/30CXXC10/30CX

Pressure Switch Control XC30CX Electronic Temperature Control

Condenser

Evaporator

VALVE

Condenser

Evaporator

VALVE

Time Delay

Discharge Line T-stat

Fan Cycling Control

Fan Cycling Control

High Pressure Switch

Low Pressure Control

Temp Sensor

DLT Sensor

Pressure Sensor

Comparison with Mechanical SolutionsComparison with Mechanical Solutions

Built In Controls

Fan Cycling

Time Delay

DLT Thermostat

Pressure Control

Alarm Display

Data Storage

High Pressure Switch

XC10/30CXXC10/30CX

The use of an XC controller gives less external devices compared with a standard electro-mechanical solution!

Features Mechanical XC10-30CX

Low pressure control Adjustable Mechanical Switch

Suction Pressure Transducer

High Pressure UL Safety Control

Adjustable or Fixed Mechanical Switch

Fixed Mechanical Switch

Fan Cycling 2 Mechanical Switches Temperature or Pressure Sensor

Time Delay (between 2 compressor starts)

Timing Module Built In

Discharging Line Protection

Mechanical Thermostat Temperature sensor

Bump Start Timing Module Built In

Data Storage (Alarms, Counters)

Need External device Built In

Comparison with Mechanical SolutionsComparison with Mechanical Solutions

XC10/30CXXC10/30CX

XC10/30CXXC10/30CXPlus and BenefitsThe advantages of using this kind of electronic controller for Condensing Unit Applications are:

• Less time spent to set-up the system if compared with any mechanical solution

• Less external devices to control the system if compared with mechanical solutions

• More accuracy and stability of the measures , tighter set-point tolerance

• An analog input can be set to monitor the condenser temperature

• Regulation can use pressure or temperature probe

• Diagnostic functions allows faster and simple service operations

• System protection inputs extend equipment life

• Additional functions at start-up to prevent errors (smart error pressure probe) and for equipment protection (flooded stast protection)

• A couple of digital outputs for fan management allow to share the working load

The advantages of using this kind of electronic controller for Condensing Unit Applications are:

• Less time spent to set-up the system if compared with any mechanical solution

• Less external devices to control the system if compared with mechanical solutions

• More accuracy and stability of the measures , tighter set-point tolerance

• An analog input can be set to monitor the condenser temperature

• Regulation can use pressure or temperature probe

• Diagnostic functions allows faster and simple service operations

• System protection inputs extend equipment life

• Additional functions at start-up to prevent errors (smart error pressure probe) and for equipment protection (flooded stast protection)

• A couple of digital outputs for fan management allow to share the working load

XC10/30CXXC10/30CXFunctions

Smart Error Pressure Probe ManagementIf a system has been off for a period of time, and the suction pressure is greater thanthe maximum value the suction transducer can read, when the compressor restarts aspecial algorithm permits to by-pass any pressure probe error visualization. Anyway, thecompressor will be able to restart only when all the safety conditions are fulfilled (e.g.high pressure digital input not active).

External Trigger Signal To Enable RegulationWhen an external thermostat is used to control the system temperature, it will bepossible to control the condensing unit by using an external trigger signal (named“Thermostat D.i.” on the label).

Smart Error Pressure Probe ManagementIf a system has been off for a period of time, and the suction pressure is greater thanthe maximum value the suction transducer can read, when the compressor restarts aspecial algorithm permits to by-pass any pressure probe error visualization. Anyway, thecompressor will be able to restart only when all the safety conditions are fulfilled (e.g.high pressure digital input not active).

External Trigger Signal To Enable RegulationWhen an external thermostat is used to control the system temperature, it will bepossible to control the condensing unit by using an external trigger signal (named“Thermostat D.i.” on the label).

XC10/30CXXC10/30CXFunctions

“BUMP START” FunctionThis function provides additional flooded start protection. The compressor is turned on(par. “on”) and then turned off (par. “oFF”) more times (par. “nub”) before thecompressor starts running normally again. This allows for the refrigerant to exit thecompressor without the oil being removed as well. The below table show all theinvolved parameters.

“BUMP START” FunctionThis function provides additional flooded start protection. The compressor is turned on(par. “on”) and then turned off (par. “oFF”) more times (par. “nub”) before thecompressor starts running normally again. This allows for the refrigerant to exit thecompressor without the oil being removed as well. The below table show all theinvolved parameters.

BUMP START FUNCTION PARAMETERS

bMP Bump start enabling no; YES

on Compressor on time 1 to 15 sec

oFF Compressor off time 1 to 15 sec

nub Number of cycle during bump start 1 to 15

bEn Compressor stop time before next bump start 1.0 to 23h50min, res. 10 min

XC10/30CXXC10/30CXProtections

High Pressure Safety ControlA digital input (named “HP D.i.” on the label) can be used to block the compressor whena high pressure alarm condition is present.

Discharging Line Temperature ProtectionA temperature sensor (PTC type connected to the DLT input) permits the user to controlthe discharge line. The “nPS” parameter sets the number of automatic alarm reset perhour permitted (directly from the controller). On the nPS-th trip, the controller willrequire a manual reset. It is also possible to enable an endless automatic alarm resetby setting nPS=0.

Condenser High Temperature WarningThe second probe can be used to monitor the condenser temperature and to show analarm on the display when the measured temperature exceed the limit.

High Pressure Safety ControlA digital input (named “HP D.i.” on the label) can be used to block the compressor whena high pressure alarm condition is present.

Discharging Line Temperature ProtectionA temperature sensor (PTC type connected to the DLT input) permits the user to controlthe discharge line. The “nPS” parameter sets the number of automatic alarm reset perhour permitted (directly from the controller). On the nPS-th trip, the controller willrequire a manual reset. It is also possible to enable an endless automatic alarm resetby setting nPS=0.

Condenser High Temperature WarningThe second probe can be used to monitor the condenser temperature and to show analarm on the display when the measured temperature exceed the limit.

XC10/30CXXC10/30CXProtectionsSmart Fan Control With Fan Cycling (only for XC30CX )XC30CX has 2 outputs to drive 2 different condensing fans. A smart fan algorithmshares the fan working time between these outputs. The below picture show how thisalgorithm work.

Smart Fan Control With Fan Cycling (only for XC30CX )XC30CX has 2 outputs to drive 2 different condensing fans. A smart fan algorithmshares the fan working time between these outputs. The below picture show how thisalgorithm work.

F1

F2

Sf2

Sf2+HF2ZIC

Sf1 + Hf1

Sf1

Parameters:Sf1: FAN1 set point Sf2: FAN2 set pointHF1: FAN1 differentialHF2: FAN2 differential

XC10/30CXXC10/30CX

Alarm MenuAn alarm menu is present and accessible by using a frontal button. This menu gives information about:

• Number of high pressure alarms• Number of high temperature alarms• Number of manual restart operations

Service MenuThis menu, accessible by using a frontal button, gives information about:

• Number of compressor activations• Compressor working time (hours)• First (output) fan working time (hours)• Second (output) fan working time (hours)

Alarm MenuAn alarm menu is present and accessible by using a frontal button. This menu gives information about:

• Number of high pressure alarms• Number of high temperature alarms• Number of manual restart operations

Service MenuThis menu, accessible by using a frontal button, gives information about:

• Number of compressor activations• Compressor working time (hours)• First (output) fan working time (hours)• Second (output) fan working time (hours)

Diagnostics

XC10CX XC30CXXC10CX XC30CX

XC10/30CXXC10/30CXDiagrams

XC10/30CXXC10/30CXDiagramsExample of an XC30CX with 2 pressure transducers, digital inputs and loads.Example of an XC30CX with 2 pressure transducers, digital inputs and loads.

XC10/30CXXC10/30CXDiagramsExample of an XC30CX with a pressure transducers (suction line), an NTC probe

(discharge line), digital inputs and loads.

Example of an XC30CX with a pressure transducers (suction line), an NTC probe

(discharge line), digital inputs and loads.

XC10/30CXXC10/30CXExtension Cable CAB/HK

A special cable (named CAB/HK) is available to extend the inputs from the 13th to the

17th externally from the device. The length of this cable is 0.5m.

A special cable (named CAB/HK) is available to extend the inputs from the 13th to the

17th externally from the device. The length of this cable is 0.5m.