AEC TCU Series Open Reservoir Water Temperature Control Units - Manual (Page 39)

Page 40 Open Resevoir Water Temperature Control Units
Chapter 6: Unit Maintenance
Never attempt to service a unit until a qualified
electrician has opened and locked out the main
disconnect using OSHA 1910.147 standards.
The water supply should be turned off and internal
pressure should be relieved before you remove panels.
All electrical connections must be done by a qualified
electrician.
Disconnect all power to the unit, let the unit
cool down, and turn off the water prior to any
servicing.
Failure to do so can result in SERIOUS INJURY
OR DEATH!
6-1 Preventive Maintenance
Draining
Drain the unit thoroughly if you are taking it out of service for a
long period of time, or you expose it to freezing. Drain plugs are
provided at the base of the heater tank and at the base of the pump.