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Thermal Care NQA25 - User Manual

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Installation & Operation Manual
NQ Series Portable and Remote Condenser Chillers

Table of Contents

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Summary

Safety Guidelines

General Warning

General warnings and safety precautions for equipment use.

Electricity Warning

Warning about hazardous voltages.

Sharp Element Warning

Warning about sharp edges and fan blades.

Hot Surface Warning

Warning about hot surfaces causing burns.

Wear Eye Protection

Safety instruction to wear eye protection.

Wear Protective Gloves

Safety instruction to wear protective gloves.

Wear Ear Protection

Safety instruction to wear ear protection.

Disconnect Before Carrying Out Maintenance or Repair

Safety instruction to disconnect power before service.

Connect an Earth Terminal to Ground

Safety instruction for grounding the unit.

Warning Against Misuse

Warning against using equipment outside its design intent.

Refrigerant Relief Valve Venting

Warning on venting refrigerant relief valves.

Pre-Installation

Receiving Inspection

Procedures for inspecting the unit upon arrival.

Installation - Chiller Mechanical

Foundation

Requirements for chiller foundation and mounting.

Unit Location

Guidelines for selecting a suitable chiller location.

Rigging

Methods for safely moving and positioning the chiller.

Chilled Water Piping

Proper installation of chilled water piping.

Installation - Remote Air-Cooled Condenser

Location

Guidelines for locating the remote air-cooled condenser.

Mounted Legs and Lifting (5 - 10 ton Units)

Instructions for mounting legs and lifting 5-10 ton units.

Mounted Legs and Lifting (15 - 40 ton Units)

Instructions for mounting legs and lifting 15-40 ton units.

Interconnecting Refrigerant Piping

Guidance on connecting chiller and condenser refrigerant lines.

Refrigeration Piping Design

Key considerations for refrigerant piping design.

General Design Considerations

Important design considerations for piping.

Determining Equivalent Line Length

How to calculate equivalent line length for piping.

Line Size Calculation Steps

Steps to determine proper line size.

Liquid Line Sizing

Guidelines for sizing liquid refrigerant lines.

Discharge (Hot Gas) Line Sizing

Guidelines for sizing discharge (hot gas) lines.

Calculating System Refrigerant and Oil Charge

Installation - Electrical

Hazardous Voltage Warning

Warning about severe injury or death from hazardous voltages.

Refrigerant Pressure Warning

Warning about refrigerant under pressure.

Sharp Fan Blade Warning

Warning about sharp fan blades and guards.

Hot Surface Warning

Warning about hot surfaces causing burns.

Power Disconnect Caution

Caution to disconnect and lock out power before service.

Eye Protection Caution

Caution to wear eye protection during maintenance.

Protective Gloves Caution

Caution to wear protective gloves during maintenance.

Grounding Caution

Caution to ground the unit properly.

Crankcase Heater Power Caution

Caution about maintaining power for crankcase heater.

Standard Controller Operation

Alarm Silence; Alarm Reset Button

Button to silence alarms and reset faults.

Optional Controller Operation

Active Alarms Screen

Displays all active alarms and reset capability.

Compressor Setup Screen

Displays and allows adjustment of compressor parameters.

Process Setup Screen

Displays and allows adjustment of temperature alarms.

Hot Gas Bypass Screen PID Tuning

Adjusts PID parameters for hot gas bypass valve.

Freezestat Setup Screen

Displays and allows adjustment of Freezestat settings.

Process Diagnostic Screen

Displays operating status of coolant temp, pump, HGBP valve.

Start-Up

Procedures for initial chiller start-up.

Start-Up

Step 1 - Connect Main Power

Connect main power and check phase sequence.

Step 2 - Fill Coolant Circuit

Fill coolant reservoir with water/glycol.

Step 3 - Check Condenser

Verify adequate condenser cooling.

Step 4 - Check Refrigerant Valves

Verify all refrigerant valves are open.

Step 5 - Verify Freezestat Setting

Set Freezestat appropriately for operating conditions.

Step 6 - Turn On Control Power

Turn on control power and reset alarms.

Step 7 - Establish Coolant Flow

Ensure coolant flow through the chiller.

Step 8 - Initial Unit Operation

Initial unit operation and checks.

Preventive Maintenance

Preventive Maintenance Checklist

General Troubleshooting

Thermal Care NQA25 Specifications

General IconGeneral
Tons25
Cooling Capacity300, 000 BTU/hr
Compressor TypeScroll
RefrigerantR410A
Voltage460/3/60

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