33
DUAL CHILLER PUMP CONTROL FOR PARALLEL
CHILLER APPLICATIONS — It is recommended that a
dedicated pump be used for each unit. The chiller must start
and stop its own water pump located on its own piping. If
pumps are not dedicated for each chiller, chiller isolation
valves are required and each chiller must open and close its
own isolation valve.
DUAL CHILLER CONTROL FOR SERIES APPLICA-
TIONS — To configure the master chiller for series applica-
tions using the Touch Pilot™ display, see Table 28. To
configure the master chiller for series applications using the
Navigator™ display, see Table 29. A power cycle is required
for the values to take effect.
To configure the slave chiller for series applications using
the Touch Pilot™ display, see Table 30. To configure the slave
chiller for series applications using the Navigator™ display,
see Table 31.
Table 27 — Dual Slave Chiller Control Parameters for Parallel Applications with Navigator™ Display
Table 28 — Dual Master Chiller Control Parameters for Series Applications with Touch Pilot Display
ITEM
ITEM EXPANSION
PATH
VALUE
MSSL
Master/Slave Select
Configuration
RSET
Slave
Default: Disable
SLVA
Slave Address
Configuration
RSET
Must be set to the Slave Chiller’s address.
The master and slave chiller must have
different addresses and be on the same
Bus Number
Default: 2
LLBL
Master Lead Lag Select
Configuration
RSET
Range: Always Lead, Lag if Fail, Runtime Sel
Default: Always Lead
LLBD
Lead/Lag Balance Delta
Configuration
RSET
Range: 40 to 400 hours
Default: 168 hours
LLDY
Lag Start Delay
Configuration
RSET
Range: 2 to 30 minutes
Default: 10 minutes
LL.ER
Start If Error Higher
Configuration
RSET
Range: 3.0 to 18
F (1.7 to 10.0
C)
Default: 4.0
F (2.2
C)
LAG.M
Lag Unit Pump Select
Configuration
RSET
Range: Off If U Stp, On If U Stop
Default: Off If U Stp
LPUL
Lead Pulldown Time
Configuration
RSET
Range: 0 to 60 minutes
Default: 0 minutes
SERI
Chillers in Series
Configuration
RSET
No,
Default: No
OPER
Operating Control Type
Operating Modes
SLCT
CCN Control
DISPLAY NAME
PATH
LINE NO.
VALUE
Master/Slave Select
Main Menu
Config
MST_SLV
3
1 (Master)
Default: 0 (Disable)
Master Control Type
Main Menu
Config
MST_SLV
7
1 (Local Control)
2 (Remote Control)
3 (CCN Control)
Default: 1 (Local Control)
Value: Configure for proper control type.
Slave Address
Main Menu
Config
MST_SLV
11
Must be set to the Slave Chiller’s address.
The master and slave chiller must have
different addresses and be on the same
Bus Number
Default: 2
Lead Lag Select
Main Menu
Config
MST_SLV
12
0 (Master Always Leads)
1 (Lag Once Failed Only)
2 (Lead/Lag Runtime Select)
Default: 0 (Master Always Leads)
Lead/Lag Balance Delta
Main Menu
Config
MST_SLV
16
Range: 40 to 400 hours
Default: 168 hours
Lag Start Timer
Main Menu
Config
MST_SLV
17
Range: 2 to 30 minutes
Default: 10 minutes
Lead Pulldown Time
Main Menu
Config
MST_SLV
18
Range: 0 to 60 minutes
Default: 0 minutes
Start If Error Higher
Main Menu
Config
MST_SLV
19
Range: 3.0 to 18
F (1.7 to 10.0
C)
Default: 4.0
F (2.2
C)
Lag Minimum Running Time
Main Menu
Config
MST_SLV
20
Range: 0 to 150 minutes
Default: 0 minutes
Lag Unit Pump Control
Main Menu
Config
MST_SLV
21
0 (Stop If Unit Stops)
1 (Run If Unit Stops)
Default: 0 (Stop If Unit Stops)
Chiller In Series
Main Menu
Config
MST_SLV
22
Yes
Default: No
