Issue:
How do I set the custom fan speed on an RTAE or ACR with InvisiSound Ultimate?
Resolution:
Noise Reduction Request
When an ACR or RTAE is configured with InvisiSound Ultimate, it will include the 1K8 module. On this module, there is an input on terminals J2-3 and 4 to provide the ability to make a 5K37 contact closure (field supplied) for a noise reduction request. Noise reduction can also be enabled from the front panel or BAS (BCI-C, LCI-C).
When there is no request for noise reduction, the fans will run up to full speed.
When noise reduction is enabled, the chiller will limit fan speed to a percentage between 60% minimum and 100% maximum of the full 920 RPM. This can be set at the front panel or through TU. Values can be input in 1% increments.
It is NOT possible to set multiple levels of noise reduction. Example: 850rpm during the day, 800rpm during the evening, 700rpm at night. The chiller will either run fans up to maximum rpm or utilize the single entered limit.
Selecting the Ultimate option in TOPSS allows the user to select fan speeds of 920, 700, 650 or 600. The TOPSS output data is for modeling purposes only and will not lock out or limit the end user from operating the chiller at different fan RPM in the field.
For best results, use the capacity and efficiency generated with maximum fan speed for the performance section of the job schedule and the sound generated with minimum fan speed for the sound section of the schedule. This will ensure we do not give up tons and efficiency to meet a specific sound value when operating at reduced fan RPMs.
Notes:
Changes:
Other Question/Problem/Cause Statements:
- Can I limit the fan speed through the BACnet interface?
- Can I limit the fan speed through the Lontalk interface?
- Ultimate sound package fan control
- Ultimate sound fan speed
- Noise Reduction Request
- Night noise setback
Facts:
- Air-Cooled Chiller (Pueblo) (ACR)
- Air-Cooled Chiller (Pueblo) (RTAE)
Document Identifier: DOC-106404
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.