Carrier AquaSnap 30MPA Series User Manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53300170-01 Printed in U.S.A. Form 30MP-4T Pg 1 8-17 Replaces: 30MP-3T
Controls, Start-Up, Operation,
Service, and Troubleshooting
CONTENTS
Page
SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . .2,3
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Conventions Used in this Manual . . . . . . . . . . . . . . . . 3
Basic Controls Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-36
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Main Base Board (MBB). . . . . . . . . . . . . . . . . . . . . . . . . . 7
AUX Board (AUX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Energy Management Module (EMM) . . . . . . . . . . . . . . 7
Current Sensor Board (CSB) . . . . . . . . . . . . . . . . . . . . . 7
Expansion Valve (EXV) Board . . . . . . . . . . . . . . . . . . . . 7
Enable/Off/Remote Control Switch . . . . . . . . . . . . . . . 7
Emergency On/Off Switch. . . . . . . . . . . . . . . . . . . . . . . . 7
Board Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Control Module Communication . . . . . . . . . . . . . . . . . 7
Carrier Comfort Network
®
Interface . . . . . . . . . . . . . 13
Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
• COOLER LEAVING FLUID SENSOR
• COOLER ENTERING FLUID SENSOR
• CONDENSER LEAVING FLUID SENSOR
• CONDENSER ENTERING FLUID SENSOR
• COMPRESSOR RETURN GAS
TEMPERATURE SENSOR
• OUTDOOR-AIR TEMPERATURE SENSOR
• DUAL LEAVING WATER TEMPERATURE SENSOR
• DISCHARGE TEMPERATURE THERMISTOR
• SPACE TEMPERATURE SENSOR
Energy Management Module . . . . . . . . . . . . . . . . . . . . 16
Loss-of-Cooler Flow Protection . . . . . . . . . . . . . . . . . 16
Condenser Flow Protection . . . . . . . . . . . . . . . . . . . . . 16
Thermostatic Expansion Valves (TXV) . . . . . . . . . . 16
Electronic Expansion Valves (EXV) . . . . . . . . . . . . . 17
Capacity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
• MINUTES LEFT FOR START
• MINUTES OFF TIME
• CAPACITY CONTROL OVERRIDES
Time, Day, and Date. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Operation of Machine Based on Control Method. . 21
Cooling Set Point Select . . . . . . . . . . . . . . . . . . . . . . . . 25
Ice Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Cooler Pump Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Alarm Routing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Cooler Pump Sequence of Operation . . . . . . . . . . . 27
Condenser Pump/Condenser Fan Output
Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Configuring and Operating Dual Chiller Control. . 27
Temperature Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Demand Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
• DEMAND LIMIT (2-Stage Switch Controlled)
• EXTERNALLY POWERED DEMAND LIMIT
(4 to 20 mA Controlled)
• DEMAND LIMIT (CCN Loadshed Controlled)
Cooling Set Point (4 to 20 mA) . . . . . . . . . . . . . . . . . . 34
Page
Digital Scroll Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36,37
System Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
START-UP AND OPERATION. . . . . . . . . . . . . . . . . 37-40
Actual Start-Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Check Refrigerant Charge. . . . . . . . . . . . . . . . . . . . . . . 38
Check Compressor Oil Level. . . . . . . . . . . . . . . . . . . . 39
Adjust Oil Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Operating Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
• TEMPERATURES
• VOLTAGE — ALL UNITS
OPERATION SEQUENCE. . . . . . . . . . . . . . . . . . . . . . . . 40
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40-52
Service Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Electronic Components . . . . . . . . . . . . . . . . . . . . . . . . . 41
• CONTROL COMPONENTS
Electronic Expansion Valve (EXV). . . . . . . . . . . . . . . 41
EXV Troubleshooting Procedure . . . . . . . . . . . . . . . . 42
Compressor Replacement . . . . . . . . . . . . . . . . . . . . . . 44
30MP Cooler and 30MPW Condenser . . . . . . . . . . . 44
• BRAZED-PLATE COOLER AND CONDENSER
HEAT EXCHANGER REPLACEMENT
• BRAZED-PLATE COOLER AND CONDENSER
HEAT EXCHANGER CLEANING
Water Treatment . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Oil Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Check Refrigerant Feed Components . . . . . . . . . . . 45
• FILTER DRIER
• MOISTURE-LIQUID INDICATOR
• THERMOSTATIC EXPANSION VALVE (TXV)
• MINIMUM LOAD VALVE
• PRESSURE RELIEF DEVICES
Check Unit Safeties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Thermistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Pressure Transducers . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Chilled Water Flow Switch . . . . . . . . . . . . . . . . . . . . . . 47
Strainer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Replacing Defective Modules . . . . . . . . . . . . . . . . . . . 52
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Recommended Maintenance Schedule. . . . . . . . . . 52
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 52-71
Complete Unit Stoppage and Restart. . . . . . . . . . . . 52
• GENERAL POWER FAILURE
• UNIT ENABLE-OFF-REMOTE CONTROL SWITCH
IS OFF
• CHILLED FLUID PROOF-OF-FLOW SWITCH OPEN
• OPEN 24-V CONTROL CIRCUIT BREAKER(S)
• COOLING LOAD SATISFIED
• THERMISTOR FAILURE
• ENABLING AND DISABLING COMPRESSORS
• COMPRESSOR DISCHARGE CHECK VALVE
• LOW SATURATED SUCTION
• COMPRESSOR SAFETIES
AquaSnap
®
30MPA,MPW015-071
Liquid Chillers with Scroll Compressors
and ComfortLink Controls

Carrier AquaSnap 30MPA Series Specifications

General

Brand	Carrier
Model	AquaSnap 30MPA Series
Category	Chiller
Language	English

Summary

General Information and Controls

Control System Components

Overview of main control boards, switches, and communication modules.

Capacity Control Logic

How the chiller adjusts capacity based on load and temperature differences.

Dual Chiller Control Configuration

Setup for operating two chillers in parallel or master/slave configuration.

Demand Limit Control

Methods to limit chiller capacity during peak energy usage periods.

Start-Up and Operation Procedures

Preliminary Refrigerant Charge

Initial refrigerant charging steps for 30MPA units.

System Evacuation and Dehydration

Procedures for removing moisture and air from the refrigerant system.

Refrigerant Charge Check

Steps to verify the refrigerant charge and subcooling level.

Liquid Charging Method

Recommended method for adding refrigerant charge by weight.

Compressor Oil Level Check

How to check compressor oil levels and requirements.

Oil Charge Adjustment

Procedures for adding oil to compressors based on line length.

Operation Sequence

Unit Start-Up Sequence

How the unit starts based on control signals and timing.

Service Procedures

Service Test Mode

Electronic Components and EXV

Overview of electronic controls, EXV operation, troubleshooting, and replacement.

EXV Valve and Motor Replacement

Compressor Replacement Procedures

Steps for removing and installing scroll compressors.

Unit Safeties and High Pressure Switch

Chilled Water Flow Switch

Recommended Maintenance Schedule

Troubleshooting Guide

Unit Stoppage and Restart Issues

Compressor Operation and Protection

Covers compressor enabling/disabling, discharge check valve, low suction, and safeties.

Compressor Electrical Protection

Details on overcurrent, short circuit, thermal overload, and ASTP protection.

Motor Protection Module Troubleshooting

Alarms and Alerts Overview

Compressor Stuck Failure Alarms

High Pressure and Head Pressure Alarms

Low Suction Pressure and Reverse Rotation Alarms

Flow and Pump Control Alarms