12
ELECTRIC SHOCK AND BURN HAZARD. Discon-
nect all power before servicing or performing
maintenance to the system. Do not attempt to
service system while it is operating or while
hot. Failure to comply can result in:
a. Electric
shock.
b. Burns from hot heating elements, piping,
and hot oil or water.
c. Injury from operating or rotating pump and
motor.
Maintenance is to be performed by qualified
personnel only. Thoroughly read and under-
stand these instructions. Consult the factory if
you have any questions.
Shut Down
To take the unit out of service, the following steps must
be done in sequence:
1. Set the temperature controller setpoint to 90°F or
lower. Allow to cool.
2. Turn off power to the unit. The controller will turn
off.
3. Turn off the water supply to the unit.
4. Disconnect electrical supply to the unit.
5. Carefully bleed pressure from the system by loos-
ening a pipe fitting.
System may be pressurized. Use extreme care
while removing piping. Disconnect water sup-
ply, drain and process connections.
6. Drain all water from the system.
Draining
Drain the unit before taking it out of service for a pe-
riod of time, or if it is exposed to freezing temperatures
while out of service.
1. To drain the unit completely, move it to an inclined
position with the front of the system raised.
2. Remove the lower plugs on cast chambers (see
Figure 6.1, Chamber Photo).
Figure 6.1 Chamber Photo
Remove these
plugs
Section 6 – Maintenance
Thermal Devices, Inc. Mount Airy, Maryland USA www.thermaldevices.com
Thermal Devices, Inc. Mount Airy, Maryland USA www.thermaldevices.com