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M
A
STER
COOL_EWT
COOL_EWT
SLA
V
E
LOAD
SLAVE PUMP
MASTER PUMP
COOL_LWT
COOL_LWT
Typical parallel Master/slave chillers, dedicated primary pumping, variable flow
Entering water control
M
A
STER
COOL_EWT
COOL_EWT
SLA
V
E
LOAD
COMMON PRIMARY PUMP
COOL_LWT
COOL_LWT
Typical parallel Master/slave chillers, common primary pumping, variable flow
Entering water control
COOL_EWT
SLAVE
LOAD
CHWS temp sensors
COOL_EWT
COOL_LWT
COOL_LWT
MASTER
PUMP (not controlled by chillers)
ISOLATION (controlled by chillers)
VALVES
BYPASS (controlled by chillers)
VALVES
Typical series Master/slave chillers, dedicated primary pumping, constant flow
Leaving water control option
4.19.2 - Abnormal conditions
If a communication failure is detected between the master and the slave then all master/slave functions shall be
disabled and chillers shall return to standalone operations until communication is reestablished.
If any chiller is stopped due to failure then the other chiller will be allowed to start with no delay.
If master/slave configuration error occurs, master/slave shall be disable.
CARRIER SA
USER'S GUIDE FOR
30GX&HX PRO_DIALOG 4 V.2
ECG-UG-02-002
Rev: Original
Page: 55/98
©
C
ARRIER
S
.
A
NOT
TO
BE
DISCLOSED
TO
PERSONS
OUTSIDE
CARRIER
ORGANIZATION
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