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

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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