THERMAL CUTOUT
(480 volt models)
If for any reason temperatures increase beyond normal
limits, safety thermal limit will open de-energizing heat-
ing element and fan motor. Check entire installation to
determine cause of overheating and take corrective
measures. The limit control is the automatic reset type
and after cooling will reset, allowing heater to resume
operation.
CAUTION:
To avoid the risk of fire, shock or personal
injury; do not insert or allow any foreign objects or
hands to enter any ventilation or exhaust openings.
THERMAL CUTOUT OPERATION
(WITH ZERO-VOLT RESET)
To reset thermal cutout disconnect all power for 5
minutes then energize unit. If fault continues discon-
nect power and check for causes.
THERMAL CUTOUT OPERATION
(WITH CAPILLARY MANUAL RESET)
To reset thermal cutout, first disconnect power from
the unit allowing time to cool, locate the two 1/4” dia.
openings in the front grille.Using a small screwdriver
or pencil press the reset button (with minimal amount
of force) through the 1/4” opening, then restore power
to the unit. If fault continues disconnect power and
check for causes.
THERMAL CUTOUT IDENTIFICATION
All 480V Models employ a automatic limit control.
208, 240 and 277V models may employ zero-volt or
capillary manual reset limit control.
Models with capillary type manual reset limit control.
This device is located on the heater venturi (bottom of
unit as installed) with the capillary routed around the
outside of the element assembly.
2
3480 / RCH SERIES CEILING HEATER
WIRING DIAGRAMS:
Shown on pages 4, 5, 6 and 7
WD-1, -3, -5, -7, -9, -11, -13, -15, -17 and -19 are dia-
grams of units that employ (zero-volt) manual reset limit
control devices.
WD-2, -4, -6, -8, -10, -12, -14, -16, -18 and -20 are dia-
grams of units that employ (capillary) manual reset limit
control devices.
OPTIONAL LOUVERED DIFFUSER
The factory installed louvered diffuser can be
adjusted to direct air flow as desired. If necessary the
louvered diffuser can be rotated 90 degrees by
removing the four mounting scews and turning the
louvered diffuser to the desired position and attaching
to the grille. Care must be taken to align the notched
corners of the diffuser frame with the reset holes in the
grille. The louvered diffuser cannot be used in
conjunction with the standard circular outlet.