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ECWS -vs- Input (VDC)
70
60
max
50
40
Out
of
30
Rang
20
e
10
0
min
0
1
2
3
4
5
Figure 19
External Chilled Water Setpoint
CGWF-SVX01A-EN
Installation Electrical
External Chilled Water Setpoint Option
The MP provides inputs that will accept either 4-20 mA or 2-10 VDC signals to set the
chilled water setpoint. This is not a reset function; the input level defines the
setpoint. This input is used with Generic BAS installations.
The MP shall accept either a 2-10 VDC or 4-20 mA analog input suitable for customer
connection to set the unit external chilled water setpoint (ECWS).
The 2-10 VDC and 4-20 mA shall each correspond to an ECWS range with both
min_ECWS and max_ECWS configurable in Service Tool.
Out
of
Range
6
7
8
9
10
11
12
13
Input (VDC)
Ice Machine Control Option
CH530 accepts a contact closure input to initiate Ice Building. When in the ice
building mode, the chiller will be fully loaded and will continue to operate until the ice
contacts open or the return water temperature reaches the Ice Termination Setpoint.
If terminated on return setpoint, CH530 will not allow the chiller to restart until the ice
making contact is opened.
Ice building operation will be indicated by an "Ice Building" operation mode that can be
displayed at the unit or communicated over the communications link.
Ice Building Command
This is the command to enter ice building. This setpoint is defined as an Auto/On
setpoint. There are four possible ways to set this, through DynaView or TechView as
the Front Panel Ice Building Command, through an external interface switch closure
to a low voltage binary input, and through a Tracer interface. Setting this to On will
command the application into ice building if ice building is enabled.
Ice Building Enable/Disable setting
This setting will Enable or Disable the ice building option. It can be set through the
DynaView or TechView. This setting does not start or stop ice building. The Ice
Building Command starts and stops ice building.
Ice Building Termination setpoint
This setpoint has three possible sources DynaView or TechView as the Front Panel
Ice Termination Setpoint or Tracer. This setpoint has a range of 20°F to 32°F with a
default of 27°F .
Communications Interface options
Optional Tracer Communications Interface
This option allows the Tracer CH530 controller to exchange information (e.g.
operating setpoints and Auto/Standby commands) with a higher-level control device,
such as a Tracer Summit or a multiple-machine controller. A shielded, twisted pair
connection establishes the bi-directional communications link between the Tracer
CH530 and the building automation system.
ECWS -vs- Input (mA)
70
60
max
50
Out
of
40
Range
30
Diag
20
10
min
0
0
2
4
6
8
10
12
Input (mA)
Out
of
Range
Diagnosti
14
16
18
20
22
24
26
51
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