iWorx® PSU1
20 505-012, Effective: August 10, 2012
© 2012 Taco Electronic Solutions, Inc.
Commissioning
Either pump may be commissioned at any time by means of the Commissioning: Pump 1 Comm or Commissioning:
Pump 2 Comm setting. To turn the pump on, set the switch to “Enable.” To turn the pump off, set the switch to “Disable.”
To resume automatic operation, set the switch to “Auto.”
When pump 1 or pump 2 is enabled in this manner, the pump's modulated output is also set to the speed setting spec-
ified in the Commissioning: Pump 1 Mod or Commissioning: Pump 2 Mod setting.
NOTE: Care should be taken to ensure that the Pump 1 Mod or Pump 2 Mod setting is acceptable before
changing the Pump 1 Comm or Pump 2 Comm field to “Enable.”
Alarms
Circulation Pump Failed Alarm
The Pump Flow Proof is monitored whenever the lead primary pump is turned on by the controller. If the Pump Flow
Proof switch remains open after a configurable delay and Enable Alarm is not set to “Disabled,” a Circulation Pump
Failed Alarm is communicated to the LCI.
Dual Pump Failure
When both pumps have failed, a Dual Pump Failure alarm is communicated to the LCI. A dual pump failure alarm
occurs when:
• Two pumps have failed and Auto Flow Recovery Mode is not configured.
• Two pumps have failed, Flow Recovery is active and flow has not been detected for twice the duration configured
under Flow Delay.
Circulation Water Temp alarms
A temperature alarm is communicated to the LCI under the following conditions:
• Circulation Supply Water Temp High
• Circulation Supply Water Temp Low
• Circulation Return Water Temp High
• Circulation Return Water Temp Low
A “Temp High” alarm is generated when measured water temperature exceeds the limit defined in Water Temp Alm:
High Limit. A Temp High alarm returns to normal when the water temperature falls below the High Limit minus 1°F.
A “Temp Low” alarm is generated when measured water temperature is below the limit defined in Water Temp Alm:
Low Limit. A Temp Low alarm returns to normal when the water temperature rises above the Low Limit plus 1°F.
Circulation alarms are disabled when both Water Temp Alm: High Limit and Water Temp Alm: Low Limit are set to 32
°F.
CONTROLLER IDENTIFICATION
To register the controller with the LCI, press the service pin on the controller once it is properly installed and the LCI is
active on the network.
Once the PSU1 is properly installed and recognized by the LCI, the LCI can be used to configure the settings of the
controller. This section describes the commands available on the LCI for configuration of the PSU1, and the meanings
and default values for controller parameters. For more information on using the LCI, see the iWorx® LCI Application
Guide.
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