Carrier ComfortLink 6 Series Controls, Start-Up, Operation, Service, And Troubleshooting page 20

RETURN SLAVE
FLUID CHILLER
Fig. 11 — Dual Chiller Piping Arrangement
(Series Fluid Flow)
RETURN MASTER
CHILLER
FLUID
SLAVE
CHILLER
* Depending on piping sizes, use either:
• HH79NZ014 sensor/10HB50106801 well (3-in. sensor/well)
• HH79NZ029 sensor/10HB50106802 well (4-in. sensor/well)
Fig. 12 — Dual Chiller Thermistor Location
Parallel Fluid Flow
To configure the two chillers for operation, follow the
example shown in Tables 24A and 24B. The master chiller will
be configured with a slave chiller at address 2. Also in this ex-
ample, the master chiller will be configured to use Lead/Lag
Balance to even out the chiller runtimes weekly. The Lag Start
Delay feature will be set to 10 minutes. The chillers will be
configured for parallel fluid flow. The master and slave chillers
cannot have the same CCN address (CCNA, Configuration
mode under OPT2). In addition, the chillers must be connected
together on the same CCN bus. Connections can be made to
the CCN screw terminals on TB3 in both chillers. The master
chiller will determine which chiller will be Lead and which
will be Lag. The master chiller controls the slave chiller by
forcing the slave chiller ON and OFF, and forcing the control
RUN SERVICE
TEMPERATURES
STATUS TEST
Auto Manual
Display Mode Temperatures
(VIEW) On/Off (UNIT)
(TEST)
Machine Ckt A/B Ckt A
Hours/Starts Outputs Temperatures
(RUN) (OUTS) (CIR.A)
Compressor Compressor Ckt B
Run Hours Tests Temperatures
(HOUR) (COMP) (CIR.B)
Compressor
Starts
(STRT)
Software
Version
(VERS)
LEGEND
Ckt — Circuit
MASTER LEAVING
CHILLER FLUID
THERMISTOR
WIRING*
LEAVING
FLUID
INSTALL DUAL CHILLER LWT
LEAVING FLUID TEMPERATURE
THERMISTOR (T9) HERE
Table 11 — Navigator Display Menu Structure
SET
PRESSURES
POINTS
Unit Ckt A Cooling
Pressures (COOL)
(PRC.A)
Ckt B Heating
Pressures (HEAT)
(PRC.B)
Head
Pressure
(HEAD)
point of the slave chiller. The master chiller will also split
demand limiting function appropriately between the two
chillers, if demand limiting is enabled.
The master chiller is now configured for dual chiller opera-
tion. To configure the slave chiller, only the LLEN, PARA and
MSSL variables need to be set. Enable the Lead/Lag chiller
variable (LLEN) as shown in Tables 24A and 24B. Similarly,
set the Master/Slave Select variable (MSSL) to SLVE. The par-
allel variable (PARA) must be configured the same as the
master chiller. The slave chiller does not use the variables
LLBL, LLBD and LLDY.
It is recommended to set the cooling set points to the same
setting on both Master and Slave chillers for series flow
(Duplex) applications. If outdoor air reset is required the
outdoor air thermistor must be connected to the Slave chiller
(TB5 term. 7 and 8). Outdoor Air Broadcast (BCST, OAT.B)
must be configured "ON". Remote contacts should be connect-
ed to both Master and Slave to control unit operation. Optional
control inputs and Energy Management Module (EMM)
should be connected to the Master chiller.
PART
NUMBER
10HB50106801
10HB50106802
A
1/4 N.P.T.
Fig. 13 — Dual Leaving Water Thermistor Well
INPUTS OUTPUTS CONFIGURATION
Unit Unit Display
Discrete Discrete (DISP)
(GEN.I) (GEN.O)
Ckt A/B Ckt A Machine
(CRCT) (CIR.A) (UNIT)
Unit Ckt B Options 1
Analog (CIR.B) (OPT1)
(4-20)
Options 2
(OPT2)
Temperature
Reset
(RSET)
Set Point
Select
(SLCT)
Service
Configuration
(SERV)
Broadcast
Configuration
(BCST)
20
DIMENSIONS in. (mm)
A B
3.10 (78.7) 1.55 (39.4)
4.10 (104.1) 1.28 (32.5)
0.505/0.495
B
6" MINIMUM
CLEARANCE FOR
THERMISTOR
REMOVAL
TIME OPERATING
CLOCK MODES
Unit Time Modes
(TIME) (MODE)
Unit Date
(DATE)
Daylight
Savings
Time
(DST)
Schedule
(SCHD)
0.61
DIA
ALARMS
Current
(CRNT)
Reset
Alarms
(RCRN)
Alarm
History
(HIST)