Chilled Water Flow Switch; Chilled Water Pump Control; Condenser Water Loss Of Flow Protection; Condenser Water Pump Starter - Trane CGWF Installation Operation & Maintenance

Table 12 Chiller Events/Status Descriptions
Event/State
Alarm - Latching
Alarm - Auto Reset
Alarm
Warning
Chiller Limit Mode
Compressor Running
Maximum Capacity
CGWF-SVX01A-EN
Installation Electrical

Chilled Water Flow Switch

CH530 has an input that accepts a contact closure from a proof-of-flow device such
as a flow switch or pressure switch. When this input does not prove flow within a
fixed time relative to transition from Stop to Auto modes of the chiller, or if the flow is
lost while the chiller is in the Auto mode of operation, the chiller will be inhibited from
running by a non-latching diagnostic
The installer must provide a flow sensing device or a pump interlock. Refer also to
the "field wiring" diagrams attached to the inside of the control panel door.

Chilled Water Pump Control

CH530 has an evaporator water pump output relay that closes when the chiller goes
into the Auto mode. The contact is opened to turn off the pump in the event of most
diagnostics to prevent the build up of pump heat.

Condenser Water Loss of Flow Protection

CH530 has an input that accepts a contact closure from a proof-of-flow device such
as a flow switch or pressure switch. When this input does not prove flow within a
fixed time from when the pump is commanded on, or if the flow is lost while a
compressor is running, the chiller will be inhibited from running by a diagnostic.
The installer must provide a flow sensing device or a pump interlock. Refer also to
the "field wiring" diagrams attached to the inside of the control panel door.

Condenser Water Pump Starter

CH530 has a condenser water pump output relay that closes to indicate when the
condenser water pump should be started and opens to indicate when the pump
should stop. If condenser pumps are arranged in a bank with a common header, the
output can be used to control an isolation valve and/or signal another device that an
additional pump is required.

Programmable Relays

CH530 provides a flexible alarm or chiller status indication to a remote location
through a hard wired interface to a dry contact closure. Four relays are available for
this function, and they are provided (generally with a Quad Relay Output LLID) as part
of the Alarm Relay Output Option.
The events/states that can be assigned to the programmable relays are listed in the
following table.
Description
This output is true whenever there is any active latching diagnostic that targets the Chiller,
Circuit, or any of the Compressors on a circuit.
This output is true whenever there is any active non-latching diagnostic that targets the
Chiller, Circuit, or any of the Compressors on a circuit.
This output is true whenever there is any active latching or non-latching diagnostic that tar-
gets the Chiller, Circuit, or any of the Compressors on a circuit.
This output is true whenever there is any active latching or non-latching informational diag-
nostic that targets the Chiller, Circuit, or any of the Compressors on a circuit.
This output is true whenever the chiller has been running in one of the limit modes (Con-
denser, Hot Evaporator Start, Demand or Compressor Inhibit) continuously for the debounce
time. A given limit or overlapping of different limits must be in effect continuously for the
debounce time prior to the output becoming true. It will become false if no limits are
present for the debounce time.
The output is true whenever any compressors are running.
The output is true whenever the chiller has reached maximum capacity continuously for the
debounce time. The output is false when the chiller does not have all its available compres-
sors running continuously for the debounce time. See the Maximum Capacity specification
for more information.
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