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Note: All wiring should be done in accordance with local codes
and the National Electrical Code by a qualified person.
WARNING: Hazard of Electric Shock. Any installa-
tion involving electric heaters must be effectively
g r o u n d e d i n a c c o r d a n c e w i t h t h e N a t i o n a l
Electrical Code to eliminate shock hazard.
1. Connect heater according to the voltage and frequency speci-
fied on the nameplate and using the appropriate wiring dia-
gram (Figures 3 and 4).
2. Motor connections: 120V — white and black, 208/240V —
white and blue. Insulate (wire nut or tape) unused leads.
DANGER:
1. Do not restrict air-flow through the heater by
placing fabric or other obstructions in front of or
behind the heaters. With some combustible materi-
als, the resulting high discharge temperatures
could cause a fire.
WARNING: Turn off all power to service heater. Do
not attempt to service heater while unit is operating
as there is hazard of electric shock, injury from
operating fan, and burns from hot heating elements.
1. Fan motors in these heaters are provided with sealed ball bear-
ings, factory lubricated, requiring no further lubrication under
normal service conditions.
Cutout
M
N
L1
4
1
3
2
Control
Switch
For use with UB-23E and UB-32E Type B only (with switch)
OPERATION
MAINTENANCE
WIRING DIAGRAMS
L1
(Omit for
120V Heaters)
Heating
Elements
L2
Figure 3
WIRING
3. Protection against overheating is provided by an internal auto-
matic thermal cutout which opens the electric circuit if the
normal air-flow is restricted or stopped. Cutout automatically
energizes heater on removal of the obstruction.
WARNING: Users should install adequate back-up
controls and safety devices with their electric
heating equipment. Where the consequences of
failure may be severe, back-up controls are essen-
tial. Although the safety of the installation is the
responsibility of the user, Chromalox will be glad
to make equipment recommendations.
2. This heater is not intended for use in hazardous
atmospheres where flammable vapors, gases, liq-
uids or other combustible atmospheres are present
as defined in the National Electrical Code. Failure
to comply can result in explosion or fire. For these
applications see PDS CXH-EP (PF305).
2. Following long periods of idleness, heater should be vacuumed
before start-up, to remove accumulated combustible particles
which otherwise may smoke or incinerate on initial heat up.
3. Periodically inspect all electrical connections and terminals to
avoid electrical wiring difficulties. Inspect all wiring for
frayed or worn insulation.
M
G
G
For use with UB-23E and UB-32E Type A only (without switch)
Cutout
L1
(Omit for 120V Heaters)
Heating
Elements
Cutout
L2
Figure 4
G
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