Carrier 30GTR Specifications download pdf (Page 3)

MAJOR SYSTEM COMPONENTS

General —

The 30GTN,R air-cooled reciprocating chill-

ers 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 opera-

tion 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 ther-

mistors 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 be-

tween modules via a 3-wire communication bus or LEN (Lo-

cal Equipment Network). The CCN (Carrier Comfort Net-

work) bus is also supported. Connections to both LEN and

CCN buses are made at TB3. See Fig. 5.

Expansion Valve (EXV) Board — The electronic

expansion valve (EXV) board receives inputs from ther-

mistors T7 and T8. See Table 2. The EXV board commu-

nicates with the MBB and directly controls the expansion

valves to maintain the correct compressor superheat.

CompressorExpansionBoard(CXB) — The com-

pressor expansion board (CXB) receives the feedback in-

puts from compressorsA3, B3 andA4. See Table 3. The CXB

board communicates the status to the MBB and controls the

outputs for these compressors. The CXB board can also be

used as an accessory to control up to two ﬁeld-installed ac-

cessory unloaders on 080-110, 130 (60 Hz), and 230B-315B

sizes.

ScrollingMarquee 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)

display. 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 sta-

tus 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/RemoteContactSwitch — 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

position 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 application capable of handlinga5vdc,1to

20 mA load. In the Enable and Remote Contact (dry con-

tacts closed) positions, the chiller is allowed 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.

BoardAddresses — 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.

Control Module Communication

RED LED — Proper operation of the control boards can be

visually checked by looking at the red status LEDs (light-

emitting diodes). When operating correctly, the red status LEDs

should be blinking in unison at a rate of once every 2 sec-

onds. If the red LEDs are not blinking in unison, verify that

correct power is being supplied to all modules. Be sure that

the Main Base Board (MBB) is supplied with the current

software. If necessary, reload current software. If the prob-

lem still persists, replace the MBB. A board LED that is lit

continuously or blinking at a rate of once per second or faster

indicates that the board should be replaced.

GREEN LED — The MBB has one green LED. The Local

Equipment Network (LEN) LED should always be blinking

whenever power is on. All other boards have a LEN LED

which should be blinking whenever power is on. Check LEN

connections for potential communication errors at the board

J3 and/or J4 connectors. Communication between modules

is accomplished by a 3-wire sensor bus. These 3 wires run

in parallel from module to module. The J4 connector on the

MBB provides both power and communication directly to

the marquee display only.

YELLOW LED — The MBB has one yellow LED. The

Carrier Comfort Network (CCN) LED will blink during times

of network communication.

Carrier Comfort Network (CCN) Interface — The

30GTN,R chiller units can be connected to the CCN if de-

sired.The communication bus wiring is a shielded, 3-conductor

cable with drain wire and is supplied and installed in the

ﬁeld. The system elements are connected to the communi-

cation bus in a daisy chain arrangement. The positive pin of

each system element communication connector must be wired

to the positive pins of the system elements on either side of

it. This is also required for the negative and signal ground

pins of each system element. Wiring connections for CCN

should be made at TB3. Consult the CCN Contractor’s Manual

for further information.

NOTE: Conductors and drain wire must be 20 AWG (Amer-

ican Wire Gage) minimum stranded, tinned copper. In-

dividual conductors must be insulated with PVC, PVC/

nylon, vinyl, Teﬂon, or polyethylene.An aluminum/polyester

100% foil shield and an outer jacket of PVC, PVC/nylon,

chrome vinyl, or Teﬂon with a minimum operating tem-

perature range of −20 C to 60 C is required. Wire manu-

factured byAlpha (2413 or 5463),American (A22503), Belden

(8772), or Columbia (02525) meets the above mentioned

requirements.

1 2 3 4 5 6 7 8 ... 83 84

Comments to this Manuals

No comments

Carrier 30GTR Specifications Page 3

Comments to this Manuals

Related products and manuals for Small kitchen appliances Carrier 30GTR