Programmable Relays

The Programmable Relay concept provides for enunciation or hardwired interlocking of certain events or states of the chiller.

This option can be installed and configured in the field on existing chillers.

Programmable Relays

Requires the addition of the Quad Relay Output LLID.
- See IOM and/or wiring schematic for specifics.
Utilizes four output relays.
Relay contacts are isolated Form C (SPDT).
Suitable for use with 120 VAC circuits drawing up to 2.8 amps inductive, 7.2 amps resistive, or 1/3 HP and for 240 VAC circuits drawing up to 0.5 amp resistive
The output relays can be configured as desired based on a list of events/states

Example shown below (reference IOM for a specific list)
Table 15. Alarm and status relay output configurations

	Description
Alarm (Latching)	This output is true whenever there is any active latching shutdown diagnostic that targets the Unit, Circuit, or any of the Compressors on a circuit.
Alarm (Non-Latching)	This output is true whenever there is any active non-latching shutdown diagnostic that targets the Unit, Circuit, or any of the Compressors on a circuit.
Alarm	This output is true whenever there is any active latching or non-latching shutdown diagnostic that targets the Unit, Circuit, or any of the Compressors on a circuit.
Alarm Ckt 1	This output is true whenever there is any active latching or non-latching shutdown diagnostic that targets Circuit 1, or any of the Compressors on Circuit 1.
Alarm Ckt 2	This output is true whenever there is any active latching or non-latching shutdown diagnostic that targets Circuit 2, or any of the Compressors on Circuit 2.
Unit Limit Mode	This output is true whenever a circuit on the unit has been running in one of the limit modes continuously for the Limit Relay 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.
Compressor Running	The output is true whenever any compressor is running.
Circuit 1 Running	The output is true whenever any compressor of Circuit 1 is running.
Circuit 2 Running	The output is true whenever any compressor of Circuit 2 is running.
Ice Making	The output is true when Ice Building status is active.
Maximum Capacity	The output is true whenever the unit has reached maximum capacity continuously for the Max Capacity Relay debounce time. The output is false when the unit is not at maximum capacity continuously for the filter debounce time.
Evaporator Water Freeze Avoidance Request	This relay output is energized any time either the Low Evaporator Water Temperature - Unit Off or the Low Evaporator Temperature Ckt x - Unit Off diagnostics are active. This relay is intended for use as an external interlock for a field engineered and provided solution to mitigate the freeze danger implied by these diagnostics. Generally, this would be used in cases where operation of the evaporator water pump is unacceptable due to the system constraints, (i.e. such as mixing unconditioned warm water with controlled supply water as provided by other parallel chillers). The relay's output can provide the method to close bypass valves so the circulation becomes local to the evap and excludes the load, or can be used to defeat the evap pump override entirely while initiating an independent source of heat / flow to the evap.
None	This selection is desirable to provide an easy way for a customer to defeat the effect of the relay, if it has already been wired. For instance, if the relay was normally programmed as an "alarm" relay, and was wired to a claxon, it may be desirable to temporarily defeat the feature without changing wiring.
Service Request (for unit compressor or water pump)	This relay will be energized when at least one Maintenance alert condition (refer to Service required message specification) occurs, as long as at least one of associated informational diagnostic(s) will be active.
Hot Water Control	The output is true if capacity control is in Hot Water Control mode (water temperature being controlled to the Active Hot Water Setpoint). The output is false in any other capacity control mode (Chilled Water Control, Ice Making, etc.)

Tracer TU or Techview service tools are used to install the Programmable Relay Option package and assign any of the above list of events or status to each of the four relays provided with the option.
The default relay assignments are shown in Table 16 below

See the specific IOM for addition details regarding this option.
Table 16. Default assignments

Relay	Assignments
Relay 1 Terminals J2 - 1, 2, 3	Evaporator Freeze Avoidance Request
Relay 2 Terminals J2 - 4, 5, 6	Maximum Capacity
Relay 3 Terminals J2 - 7, 8, 9	Compressor Running
Relay 4 Terminals J2 - 10, 11, 12	Latching Alarm

Notes

The following chillers can support up to 8 relays for this function and are provided with (2) Quad Relay Outputs

ACSA, ACXA, RTAF, ACRB (375-550 Tons), and ACRC
Table 22. Default assignments — module 1

Relay	Output	Default
Relay 1	Terminals J2 - 1, 2, 3	Evaporator Water Freeze Avoidance Request
Relay 2	Terminals J2 - 4, 5, 6	Maximum Capacity
Relay 3	Terminals J2 - 7, 8, 9	Compressor Running
Relay 4	Terminals J2 - 10, 11, 12	Latching Alarm

Table 23. Default assignments — module 2 (if present)

Relay	Output	Default
Relay 5	Terminals J2 - 1, 2, 3	Alarm Ckt2
Relay 6	Terminals J2 - 4, 5, 6	Alarm Ckt1
Relay 7	Terminals J2 - 7, 8, 9	Alarm (Latching or Non-Latching)
Relay 8	Terminals J2 - 10, 11, 12	Non-Latching Alarm

Additional details

Facts

Air-Cooled Chiller
Water-Cooled Chiller

WARNING:

Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.

Issue:

The Programmable Relay concept provides for enunciation or hardwired interlocking of certain events or states of the chiller. This option can be installed and configured in the field on existing chillers.

Resolution:

Programmable Relays

Requires the addition of the Quad Relay Output LLID
- See IOM and/or wiring schematic for specifics
Utilizes four output relays
Relay contacts are isolated Form C (SPDT)
Suitable for use with 120 VAC circuits drawing up to 2.8 amps inductive, 7.2 amps resistive, or 1/3 HP and for 240 VAC circuits drawing up to 0.5 amp resistive
The output relays can be configured as desired based on a list of events/states
- Example shown below...reference IOM for a specific list

Tracer TU or Techview service tools are used to install the Programmable Relay Option package and assign any of the above list of events or status to each of the four relays provided with the option.
The default relay assignments are shown in Table 16 below
SEE SPECIFIC IOM FOR ADDITIONAL DETAILS REGARDING THIS OPTION

Notes:

The following chillers can support up to 8 relays for this function and are provided with (2) Quad Relay Outputs
- ACSA, ACXA, RTAF, ACRB (375-550 Tons), and ACRC