SAFETY CONSIDERATIONS

Installing, starting up, and servicing this equipment can be hazardous due to system pressures, electrical compo- nents, and equipment location (roof, elevated structures, etc.). Only trained, quali®ed installers and service mechanics should install, 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. Fol- low all safety codes. Wear safety glasses and work gloves. Use care in handling, rigging, and setting this equipment, and in handling all electrical components.

Electrical shock can cause personal injury and death. Shut off all power to this equipment during installation and service. 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 con- trol system. Do not use jumpers or other tools to short out components, or to bypass or otherwise depart from recommended procedures. Any short-to-ground of the control board or accompanying wiring may destroy the electronic modules or electrical components.

GENERAL

IMPORTANT: This publication contains controls, op- eration and troubleshooting data for 30GN040-420 Flotronic™ II chillers.

Circuits are identi®ed as circuits A and B, and com- pressors are identi®ed as A1, A2, etc. in circuit A, and B1, B2, etc. in circuit B.

Use this guide in conjunction with separate Instal- lation Instructions booklet packaged with the unit.

The 30G Series standard Flotronic II chillers feature microprocessor-based electronic controls and an electronic expansion valve (EXV) in each refrigeration circuit.

NOTE: The 30GN040 and 045 chillers with a factory- installed brine option have thermal expansion valves (TXV) instead of the EXV.

Unit sizes 230-420 are modular units which are shipped as separate sections (modules A and B). Installation instruc- tions speci®c to these units are shipped inside the individual modules. See Table 1 for a listing of unit sizes and modular combinations. For modules 230B-315B, follow all general instructions as noted for unit sizes 080-110. For all remain- ing modules, follow instructions for unit sizes 130-210.

Table 1 Ð Unit Sizes and Modular Combinations

UNIT MODEL

NOMINAL

SECTION A

SECTION B

30GN

TONS

UNIT 30GN

UNIT 30GN

040

40

Ð

Ð

045

45

Ð

Ð

050

50

Ð

Ð

060

60

Ð

Ð

070

70

Ð

Ð

080

80

Ð

Ð

090

90

Ð

Ð

100

100

Ð

Ð

110

110

Ð

Ð

130

125

Ð

Ð

150

145

Ð

Ð

170

160

Ð

Ð

190

180

Ð

Ð

210

200

Ð

Ð

230

220

150

080

245

230

150

090

255

240

150

100

270

260

170

100

290

280

190

110

315

300

210

110

330

325

170

170

360

350

190

190/170*

390

380

210

190

420

400

210

210

 

 

 

 

*60 Hz units/50 Hz units.

The Flotronic II control system cycles compressor un- loaders and/or compressors to maintain the selected leaving ¯uid temperature set point. It automatically positions the EXV to maintain the speci®ed refrigerant superheat entering the compressor cylinders. It also cycles condenser fans on and off to maintain suitable head pressure for each circuit. Safe- ties are continuously monitored to prevent the unit from op- erating under unsafe conditions. A scheduling function, pro- grammed by the user, controls the unit occupied/unoccupied schedule. The control also operates a test program that al- lows the operator to check output signals and ensure com- ponents are operable.

The control system consists of a processor module (PSIO), a low-voltage relay module (DSIO-LV), 2 EXVs, an EXV driver module (DSIO-EXV), a 6-pack relay board, a keypad and display module (also called HSIO or LID), thermistors, and transducers to provide inputs to the microprocessor. A standard options module (SIO) is used to provide additional functions. See Fig. 1 for a typical 30GN Control Panel.

MAJOR SYSTEM COMPONENTS

Processor Module Ð This module contains the oper- ating software and controls the operation of the machine. It continuously monitors information received from the vari- ous transducers and thermistors and communicates with the relay modules and 6-pack relay board to increase or de- crease the active stages of capacity. The processor module

2

Page 2
Image 2
Carrier 30GN040-420 Unit Sizes and Modular Combinations, Unit Model Nominal Section a Section B, Tons Unit 30GN

30GN040-420 specifications

The Carrier 30GN040-420 is a well-regarded model within the industry of chillers, designed to deliver efficient cooling solutions for a variety of commercial applications. Its compact design and advanced technology make it an ideal choice for businesses looking to optimize their HVAC systems.

One of the standout features of the Carrier 30GN series is its flexibility. This chiller model is available in a range of capacities, specifically from 40 to 420 tons, allowing for customized solutions based on specific cooling demands. Such versatility enables this unit to cater to a broad array of installations, from small commercial spaces to larger industrial facilities.

The Carrier 30GN040-420 utilizes a scroll compressor design, known for its reliability and efficiency. The scroll technology allows for a reduction in the number of moving parts, resulting in lower maintenance costs and increased durability. Additionally, the unit operates with environmentally friendly refrigerants such as R-410A, promoting sustainability without compromising performance.

Energy efficiency is another significant aspect of this model. The 30GN series is designed to provide high energy efficiency ratios (EER), which translates to lower operational costs for users over the lifespan of the unit. This is particularly beneficial in an era where energy costs are consistently rising.

The advanced controls found within the Carrier 30GN040-420 further enhance its performance and ease of use. The unit is equipped with a microprocessor-based control system that allows for precise temperature management while providing valuable diagnostic information. This feature not only improves the overall reliability of the system but also facilitates proactive maintenance, reducing the risk of unscheduled downtime.

Moreover, the design of the Carrier 30GN040-420 emphasizes quiet operation, making it suitable for environments where noise levels must be minimized. This characteristic is critical for applications in hospitals, schools, or office buildings, where a peaceful atmosphere is essential.

In summary, the Carrier 30GN040-420 chiller provides a robust solution for businesses requiring dependable and efficient cooling. Its features, including flexible capacity options, reliable scroll compressors, energy-efficient performance, advanced controls, and quiet operation, position it as a top choice for various commercial and industrial applications. As technology continues to evolve, models such as the 30GN series remain at the forefront, meeting the demands of modern HVAC needs while ensuring sustainability and efficiency.