Issue:
Evaporator Heater
Resolution:
Air Cooled units with outdoor evaporators have freeze protection in the form of a resistive heater on the barrel. With the heat tape engaged, the evaporator is protected from freezing in ambient temperatures down to -20 degrees F.
The heater must be powered by a separate, field provided, power source. RTAA requires a dedicated 15 amp circuit while an RTAC requires a dedicated 20 amp circuit. Connection of this heater is required regardless of whether glycol is in the chilled water system or not. For wiring information, consult the appropriate IOM, unit wiring diagram, or submittal.
Do not attempt to power the heat tape from the chiller as it is common practice to disconnect power to some chillers during the winter months. This would defeat the protection and could cause catastrophic failure.
Refer to the appropriate wiring schematic for details.
The location of the thermostat location on the barrel (RTAA)
Notes:
In the event there is a failure with the thermostat, the heat tape may need to be removed and the heat tape replaced. It is recommended that the barrel be cleaned and new insulation be used to keep a good seal and prevent air to get in and condense causing premature failure of the evaporator.
Changes:
Other Question/Problem/Cause Statements:
- Evaporator Heat Tape?
- At what temperature does the evaporator heat tape turn on?
- Evaporator heat tape operation?
Facts:
- Air-Cooled Chiller (Pueblo) (RTAA 130-400 Ton)
- Air-Cooled Chiller (Pueblo) (RTAA 70-125 Ton)
- Air-Cooled Chiller (Pueblo) (RTAC)
Original wave: DOC-76893
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.