37
Fig. 35 — Typical Parallel Master/Slave Chillers
Common Primary Pumping, Variable Flow, Entering Water Control
Table 28 — Master Chiller Configuration in Series Applications
DISPLAY NAME PATH VALUE
Master/Slave Select
Main Menu
Configuration Menu
Master/Slave Config
1 (Master)
Default: 0 (Disable)
Master Control Type
1=Local Control
2=Remote Control
3=CCN Control
Default: 1(Local)
Configure for proper control type.
Slave Address
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
0 (Master Always Leads)
1 (Lag One Failed Only)
2 (Lead/Lag Runtime Select)
Default: 0 (Master Always Leads)
Lead/Lag Balance Delta
Range: 40 to 400 hours
Default: 168 hours
Lead/Lag Start Timer
Range: 2 to 30 minutes
Default: 10 minutes
Lead Pulldown Time
Range: 0 to 60 minutes
Default: 0 minutes
Start If Error Higher
Range: 3.0 to 18°F (1.7 to 10.0°C)
Default: 4.0°F (2.2°C)
Lag Minimum Running Time
Range: 0 to 150 minutes
Default: 0 minutes
Lag Unit Pump Control
0 (Stop If Unit Stops)
1 (Run If Unit Stops)
Default: 0 (Stop If Unit Stops)
Chiller In Series
Yes (In Series)
Default: No
CONTROL BOX
SLAVE
CHILLER
CONTROL BOX
MASTER
CHILLER
LOAD
ISOLATION VALVES
FIELD WIRING
FIELD COMMUNICATION WIRING
NOTE: This is a simplified piping diagram.
Not all hydronic specialties are shown.
MASTER
PUMP
ISOLATION VALVES
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