Carrier Air Conditioner specifications Safety Considerations, Contents

30GTN,GTR040-420 30GUN,GUR040-420 Air-Cooled Reciprocating Liquid Chillers

with ComfortLink™ Controls

50/60 Hz

Controls Start-Up, Operation, Service, and Troubleshooting

SAFETY CONSIDERATIONS

Installing, starting up, and servicing this equipment can be hazardous due to system pressures, electrical components, and equipment location (roof, elevated structures, etc.). Only trained, qualified installers and service mechanics should in- stall, start up, and service this equipment.

When working on this equipment, observe precautions in the literature, and on tags, stickers, and labels attached to the equipment, and any other safety precautions that apply. Follow all safety codes. Wear safety glasses and work gloves. Use care in handling, rigging, and setting this equipment, and in han- dling all electrical components.

Electrical shock can cause personal injury and death. Shut off all power to this equipment during installation and ser- vice. There may be more than one disconnect switch. Tag all disconnect locations to alert others not to restore power until work is completed.

This unit uses a microprocessor-based electronic control system. Do not use jumpers or other tools to short out com- ponents, or to bypass or otherwise depart from recom- mended procedures. Any short-to-ground of the control board or accompanying wiring may destroy the electronic modules or electrical components.

To prevent potential damage to heat exchanger tubes always run fluid through heat exchangers when adding or removing refrigerant charge. Use appropriate brine solu- tions in cooler fluid loops to prevent the freezing of heat exchangers when the equipment is exposed to temperatures below 32 F (0° C).

DO NOT VENT refrigerant relief valves within a building. Outlet from relief valves must be vented outdoors in accor- dance with the latest edition of ANSI/ASHRAE (American National Standards Institute/American Society of Heating, Refrigeration and Air Conditioning Engineers) 15 (Safety Code for Mechanical Refrigeration). The accumulation of refrigerant in an enclosed space can displace oxygen and cause asphyxiation. Provide adequate ventilation in enclosed or low overhead areas. Inhalation of high concen- trations of vapor is harmful and may cause heart irregulari- ties, unconsciousness or death. Misuse can be fatal. Vapor is heavier than air and reduces the amount of oxygen avail- able for breathing. Product causes eye and skin irritation. Decomposition products are hazardous.

DO NOT attempt to unbraze factory joints when servicing this equipment. Compressor oil is flammable and there is no way to detect how much oil may be in any of the refrig- erant lines. Cut lines with a tubing cutter as required when performing service. Use a pan to catch any oil that may come out of the lines and as a gage for how much oil to add to system. DO NOT re-use compressor oil.

CONTENTS

Page

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2,3

MAJOR SYSTEM COMPONENTS . . . . . . . . . . . . . . 3-10

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Main Base Board (MBB) . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Expansion Valve (EXV) Board . . . . . . . . . . . . . . . . . . . . 3

Compressor Expansion Board (CXB). . . . . . . . . . . . . 3

Scrolling Marquee Display . . . . . . . . . . . . . . . . . . . . . . . 3

Energy Management Module (EMM) . . . . . . . . . . . . . . 3

Enable/Off/Remote Contact Switch. . . . . . . . . . . . . . . 3

Emergency On/Off Switch . . . . . . . . . . . . . . . . . . . . . . . . 3

Reset Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Board Addresses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Control Module Communication. . . . . . . . . . . . . . . . . . 4

Carrier Comfort Network Interface . . . . . . . . . . . . . . . 4

OPERATING DATA. . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-47

Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

•T1 — COOLER LEAVING FLUID SENSOR

•T2 — COOLER ENTERING FLUID SENSOR

•T3,T4 — SATURATED CONDENSING TEMPERATURE SENSORS

•T5,T6 — COOLER SUCTION TEMPERATURE SENSORS

•T7,T8 — COMPRESSOR SUCTION GAS TEMPERATURE SENSORS

•T9 — OUTDOOR-AIR TEMPERATURE SENSOR

•T10 — REMOTE SPACE TEMPERATURE SENSOR

Thermostatic Expansion Valves (TXV). . . . . . . . . . . 15

Compressor Protection Control System

(CPCS) or Control Relay (CR) . . . . . . . . . . . . . . . . . 15

Compressor Ground Current Protection Board

(CGF) and Control Relay (CR) . . . . . . . . . . . . . . . . . 15

Electronic Expansion Valve (EXV) . . . . . . . . . . . . . . . 16

Energy Management Module . . . . . . . . . . . . . . . . . . . . 16

Capacity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

•ADDING ADDITIONAL UNLOADERS

•MINUTES LEFT FOR START

•MINUTES OFF TIME

•LOADING SEQUENCE

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book	2	PC 903	Catalog No. 563-025	Printed in U.S.A.	Form 30GTN-3T	Pg 1	3-00	Replaces: 30GTN-2T
Tab	5c