CCI Thermal Technologies CR1 - Trito Corrosion-Resistant Washdown Unit Heater - Manual (Page 5)

REPAIR AND REPLACEMENT
WARNING
Disconnect heater from the power supply before opening enclosures or servicing heater. Lock the switch in the
“OFF” (open) position and/or tag the switch to prevent unexpected power application. This heater should
only be serviced by qualified personnel with electrical heating equipment experience.
Note: ONLY USE FACTORY SUPPLIED REPLACEMENT PARTS OF THE SAME SPECIFICATION.
HEATING ELEMENTS
1. Disconnect all wires connected to the element terminals and remove all bus
bars. Remove discharge grill from heater. If equipped, remove element
brackets from heater.
2. Remove elements, noting their proper placement.
3. Install factory-supplied replacement elements such that the smallest loop of
the spiral element is closest to the discharge end of the heater (see figure 9).
Ensure that the element gaskets are in place and in good condition.
Tighten the element bushing nuts until the gaskets are snug between the
bushing shoulders and enclosure. Compress the gaskets by turning the nuts
1 to 1
1 /
4
additional turns. Check that the elements are not in contact with
the cabinet or each other.
4. Reinstall all bus bars, wires, brackets, and discharge grill.
FAN
1. Remove inlet grill from heater. Remove the three screws securing the fan
to the fan hub attached to the motor.
2. Replace fan with factory-supplied fan. Install the fan such that the “spider”
of the fan (see figure 10) faces the outside of the heater (i.e., facing away
from the motor). The spider should be visible from the rear of the heater
(as shown in figure 10).
GENERAL
1. To operate heater, make sure power supply is
properly connected as specified in the wiring
schematic (see figure 4 to 8 on page 4).
2. Ensure that the thermostat controlling the heater is
set above the ambient temperature.
3. If the heater is provided with the optional door
interlocking disconnect switch, ensure the switch is
in the “ON” position.
4. If the heater is provided with the optional 3-position
fan switch, ensure the switch is in the “ON” position.
Note: If the switch is in the “FAN ONLY” position,
only the fan will energize, not the elements.
5. If the heater is provided with the optional pilot light,
the light will illuminate only when the elements are
energized.
6. The heater is provided with a fan delay relay. The
fan will energize approximately 20 seconds after the
elements are energized. The fan will remain in
operation for approximately 2 minutes after the
thermostat de-energizes the elements. If the 3-
position fan switch is turned to the “OFF” position,
the fan will de-energize immediately.
7. During normal operation, the high-limit control
should not cycle the heater ON and OFF. If cycling
occurs, check to see if there is an airflow blockage.
If there are no obstructions, the heater must be
examined by qualified personnel to determine the
cause of the high-limit cycling.
8. The heater can be washed down with water at
pressures less than 70 psi.
OPERATION
FAN SPIDER
VIEW FROM
INLET END
OF HEATER
SMALL LOOP OF
SPIRAL ELEMENT
AIR FLOW
Figure 9
Figure 10 – 5 –