Table 1A — Unit Sizes and Modular Combinations

(30GTN,R)

UNIT

NOMINAL

SECTION A

SECTION B

30GTN,R

TONS

UNIT 30GTN,R

UNIT 30GTN,R

040

40

045

45

050

50

060

60

070

70

080

80

090

90

100

100

110

110

130

125

150

145

170

160

190

180

210

200

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.

Table 1B — Unit Sizes and Modular Combinations

(30GUN,R)

UNIT

NOMINAL

SECTION A

SECTION B

30GUN,R

TONS

UNIT 30GUN,R

UNIT 30GUN,R

040

26

045

28

050

34

060

42

070

48

080

55

090

59

100

66

110

72

130

84

150

99

170

110

190

122

210

134

230

154

150

080

245

158

150

090

255

165

150

100

270

176

170

100

290

193

190

110

315

206

210

110

330

219

170

170

360

243

190

190/170*

390

256

210

190

420

268

210

210

*60 Hz units/50 Hz units.

MAJOR SYSTEM COMPONENTS

General — The 30GTN,R and 30GUN,R air-cooled recip- rocating chillers contain the ComfortLink™ electronic control system that controls and monitors all operations of the chiller.

The control system is composed of several components as listed in the sections below. See Fig. 1 for typical control box drawing. See Fig. 2-4 for control schematics.

Main Base Board (MBB) — See Fig. 5. The MBB is the heart of the ComfortLink control system. It contains the major portion of operating software and controls the operation of the machine. The MBB continuously monitors input/output channel information received from its inputs and from all other modules. The MBB receives inputs from thermistors T1-T6, T9, and T10. See Table 2. The MBB also receives the feedback

inputs from compressors A1, A2, B1 and B2, and other status switches. See Table 3. The MBB also controls several outputs. Relay outputs controlled by the MBB are shown in Table 4. Information is transmitted between modules via a 3-wire com- munication bus or LEN (Local Equipment Network). The CCN (Carrier Comfort Network) bus is also supported. Con- nections to both LEN and CCN buses are made at TB3. See Fig. 5.

Expansion Valve (EXV) Board — The electronic ex- pansion valve (EXV) board receives inputs from thermistors T7 and T8. See Table 2. The EXV board communicates with the MBB and directly controls the expansion valves to main- tain the correct compressor superheat.

Compressor Expansion Board (CXB) — The CXB is included as standard on sizes 150-210 (60 Hz) and 130 (50 Hz) and associated modular units. The compressor expan- sion board (CXB) receives the feedback inputs from compres- sors A3, B3 and A4. See Table 3. The CXB board communi- cates the status to the MBB and controls the outputs for these compressors. An additional CXB is required for unit sizes 040- 110, 130 (60 Hz), 230B-315B with additional unloaders.

Scrolling Marquee Display — This device is the key- pad interface used for accessing chiller information, reading sensor values, and testing the chiller. The marquee display is a 4-key,4-character,16-segment LED (light-emitting diode) dis- play. Eleven mode LEDs are located on the display as well as an Alarm Status LED. See Marquee Display Usage section on page 29 for further details.

Energy Management Module (EMM) — The EMM module is available as a factory-installed option or as a field-installed accessory. The EMM module receives 4 to 20 mA inputs for the temperature reset, cooling set point reset and demand limit functions. The EMM module also receives the switch inputs for the field-installed2-stage demand limit and ice done functions. The EMM module communicates the status of all inputs with the MBB, and the MBB adjusts the control point, capacity limit, and other functions according to the inputs received.

Enable/Off/Remote Contact Switch — The Enable/Off/Remote Contact switch is a 3-position switch used to control the chiller. When switched to the Enable position the chiller is under its own control. Move the switch to the Off po- sition to shut the chiller down. Move the switch to the Remote Contact position and a field installed dry contact can be used to start the chiller. The contacts must be rated for dry circuit appli- cation capable of handling a 24 vac load. In the Enable and Re- mote Contact (dry contacts closed) positions, the chiller is al- lowed to operate and respond to the scheduling configuration, CCN configuration and set point data. See Fig. 6.

Emergency On/Off Switch — The Emergency On/ Off switch should only be used when it is required to shut the chiller off immediately. Power to the MBB, EMM, CXB, and marquee display is interrupted when this switch is off and all outputs from these modules will be turned off. The EXV board is powered separately, but expansion valves will be closed as a result of the loss of communication with the MBB. There is no pumpout cycle when this switch is used. See Fig. 6.

Reset Button — A reset button is located on the fuse/ circuit breaker panel for unit sizes 130-210 and associated modules. The reset button must be pressed to reset either Circuit Ground Fault board in the event of a trip.

Board Addresses — The Main Base Board (MBB) has a 3-position Instance jumper that must be set to ‘1.’ All other boards have 4-position DIP switches. All switches are set to ‘On’ for all boards.

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Carrier Air Conditioner specifications Major System Components, Unit Sizes and Modular Combinations 30GTN,R

Air Conditioner specifications

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