Carrier GTR040-420 Specifications download pdf (Page 32)

wiring. A chilled water flow switch should be installed for each

chiller.

To configure the two chillers for dual chiller operation, fol-

low the example shown in Tables 19A and 19B. Both chillers

must have the Control Method variable (CTRL, Configuration

mode, sub-mode OPT2) set to ‘3’ CCN Control. In the exam-

ple the master chiller will be configured with a CCN address of

‘1’ and the slave chiller with a CCN address of ‘2’ (CCNA,

Configuration mode, sub-mode OPT2). The master and slave

chillers can be addressed from 1 to 239. Each device connected

to the network must have its own unique address. Both chillers

must have the same CCN Bus Address (CCNB, Configuration

mode, sub-mode OPT2). Lead/Lag Chiller Enable must be set

to ENBL for both chillers (LLEN, Configuration mode, sub-

mode RSET). Also in this example, the master chiller will

be configured to use Lead/Lag Balance (LLBL, Configura-

tion mode, sub-mode RSET) to rotate the lead chiller after

168 hours of operation. The Lag Start Delay (LLBD, Configu-

ration mode, sub-mode RSET) will be set for 10 minutes. This

prevents the Lag chiller from starting until the lead chiller is

fully loaded and the delay has elapsed.

If Outdoor Air Temperature reset is desired, it should be

connected to the slave chiller. CCN OAT Broadcast will have

to be configured for ‘Ye s’ on the slave chiller and CCN Broad-

cast Ack’er will have to be configured for ‘Yes’ on the master

chiller. Broadcast functions can only be configured with Ser-

vice Tool, ComfortVIEW™, ComfortWORKS® or the

Enhanced Display option.

Table 8 — Marquee Display Menu Structure

LEGEND

Ckt — Circuit

RUN

STATUS

SERVICE

TEST

TEMPERATURES PRESSURES

SET

POINTS

INPUTS OUTPUTS CONFIGURATION

TIME

CLOCK

OPERATING

MODES

ALARMS

Auto

Display

(VIEW)

Manual

Mode

On/Off

(TEST)

Unit

Temperatures

(UNIT)

Ckt A

Pressures

(PRC.A)

Cooling

(COOL)

Unit

Discrete

(GEN.I)

Unit

Discrete

(GEN.O)

Display

(DISP)

Unit Time

(TIME)

Modes

(MODE)

Current

(CRNT)

Machine

Hours/Starts

(RUN)

Ckt A/B

Outputs

(OUTS)

Ckt A

Temperatures

(CIR.A)

Ckt B

Pressures

(PRC.B)

Heating

(HEAT)

Ckt A/B

(CRCT)

Ckt A

(CIR.A)

Machine

(UNIT)

Unit Date

(DATE)

Reset

Alarms

(RCRN)

Compressor

Run Hours

(HOUR)

Compressor

Tests

(COMP)

Ckt B

Temperatures

(CIR.B)

Head

Pressure

(HEAD)

EMM

Analog

(4-20)

Ckt B

(CIR.B)

Options 1

(OPT1)

Schedule

(SCHD)

Alarm

History

(HIST)

Compressor

Starts

(STRT)

Options 2

(OPT2)

Reset

History

(RHIS)

Software

Ver sio n

(VERS)

Temperature

Reset

(RSET)

Set Point

Select

(SLCT)

MASTER

CHILLER

SLAVE

CHILLER

LEAVING

FLUID

RETURN

FLUID

THERMISTOR

WIRING*

INSTALL DUAL CHILLER LWT

LEAVING FLUID TEMPERATURE

THERMISTOR (T10) HERE

*Depending on piping sizes, use either:

• HH79NZ014 sensor/10HB50106801 well (3-in. sensor/well)

• HH79NZ029 sensor/10HB50106802 well (4-in. sensor/well)

Fig. 21 — Dual Chiller Thermistor Location

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 103 104

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Carrier GTR040-420 Specifications Page 32

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