3
Table 1A — Unit Sizes and Modular Combinations
(30GTN,R)
*60 Hz units/50 Hz units.
Table 1B — Unit Sizes and Modular Combinations
(30GUN,R)
*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-installed 2-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.
UNIT
30GTN,R
NOMINAL
TONS
SECTION A
UNIT 30GTN,R
SECTION B
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
UNIT
30GUN,R
NOMINAL
TONS
SECTION A
UNIT 30GUN,R
SECTION B
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
