Chiller startup sequence

Parameters STRT-01 – STRT-05 define the chiller startup sequence.

The absolute parameter value defines the time between the chiller enable signal and the time point to command the output.

When the parameter value is positive, then the commanded output must be confirmed by a status feedback before the next step in the sequence is executed. The parameter values provided by the parameters STRT-01 through STRT-05 are the minimum times for starting the next stage.

If the parameter value is negative, then the next step in the sequence is executed, regardless of the status signal.

The output “CdValvePmpCmd” will be switched on if both sequences (pump STRT-01 and valve STRT-02) for the condenser are executed.

The output “ChWatValvePmpCmd” will be switched on if both sequences (pump STRT-03 and valve STRT-04) for the chiller are executed.

Fig. 5.   Chiller startup sequence

Table 1.   Parameter List

Description

Value Range

Default Value

Unit

STRT-01: Startup delay condenser pump > 0 with confirmation

-3600...3600

-10

sec

STRT-02: Startup delay condenser valve > 0 with confirmation

-3600...3600

20

sec

STRT-03: Startup delay chilled water pump > 0 with confirmation

-3600...3600

-10

sec

STRT-04: Startup delay chilled water valve > 0 with confirmation

-3600...3600

20

sec

STRT-05: Startup delay chiller

0...3600

120

sec