Chromalox UB-752D, UB-502D User Manual
DIVISION 4 SECTION
UB
SALES
REFERENCE
DATE
SERVICE REFERENCE
Installation, Operation
and
RENEWAL PARTS IDENTIFICATION
PF416-13
JULY, 2002
(Supersedes PF416-12)
161-048444-001
MOUNTING
© 2010 Chromalox®, Inc.
UB-502D and UB-752D
Forced-Air Heaters
WARNING: Hazard of Electric Shock. Disconnect all
power before installing heater.
Note: These heaters are designed for wall or ceiling mounting
only. Other modes of mounting voids factory warranty.
1. Height above floor
A. In areas where ceiling height is more than 12 feet, recom-
mended mounting height is approximately 10 feet to underside of heater.
B. For ceiling heights of 12 feet or less, maximum mounting
height is determined by use of ceiling mounting brackets
offered for these heaters. Minimum spacing to ceiling is 3”
(see Figure 2).
C. In either case, minimum mounting height is 7 feet from
floor to bottom of heater. (See Figures 1 and 2.)
2. Spacing to adjacent walls
A. Rear of case to back wall 4-7/8” minimum (see Figure 2).
B. Side of case to side wall 6” minimum (see Figure 2).
3. If two or more units are operated in the same enclosed space,
their discharges should be directed to aid in development of
mass air movement for uniform heat dispersal.
4. Controlling thermostats to individual heaters should be
mounted at shoulder height on inside walls or columns.
‡ Model Numbers with suffix “T” added (480 volts only) are equipped with a transformer, 480V Primary — 120/240V Secondary.
‡ Model Numbers with suffix “R” added are equipped with a relay.
Horizontal
Model Voltage and Phase kW Air Discharge
(Ft.)
UB-502D 120 (1ø); 208, 240 or 480 (1ø or 3ø) 5 12.5
UB-502D-R 208, 240 or 480 (1ø or 3ø) 5 12.5
UB-752D 120 (1ø); 208, 240 or 480 (1ø or 3ø) 7.5 13
UB-752D-R 208, 240 (3ø); 480 (1ø or 3ø) 7.5 13
Specifications —
Dimensions —
Rubber Feet Provided for
Wall Mount Units Only.
7/8” and 1-13/32”
Dia. Holes in Rear
11-5/8”
13-5/8”
17-3/16”
8-7/8”
7-9/16”
For Lower Height
from Ceiling:
Customer to add
Extension Strap.
11-7/8”
8”
6”
7’-0” Min. Height
Above Floor
Figure 1
Mounting UB using ceiling
mounting brackets*
Ceiling Line
Wall
Back
Wall
6” Min. Spacing to
Adjacent Wall
3”
4-7/8”
8-7/8”
15-9/16”
7’-0” Min. Height
Above Floor
Mounting
Holes
Center
8”
6”
Figure 2
Mounting UB using wall
mounting brackets*
*Wall and/or Ceiling Mounting Brackets are
available as an accessory option — Contact
local sales representative.
WIRING
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 installation
involving electric heaters must be effectively
grounded in accordance with the National 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 diagram
(Figures 3 thru 8).
Note: Be sure to check voltage rating of the fan motor which is
either 120, 208 or 240 volt, single phase since heater circuit
could be 480 volts, single or three phase.
2. If a transformer is used to step down the voltage for operating
the fan motor, use appropriate wiring diagram (Figures 5 or 7).
3. Heaters are not provided with a control switch and should be
controlled by a magnetic contactor (integral or external) and a
separately mounted thermostat. External contactor is not necessary with heaters having a model number suffixed with the
letter “R”.
4. 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 essential.
Although the safety of installation is the responsibility of the user, Chromalox will be glad to make
equipment recommendations.
OPERATION
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
materials, the resulting high discharge temperatures could cause a fire.
2. This heater is not intended for use in hazardous
atmospheres where flammable vapors, gases, liquids 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 Bulletin PDS CXH-EP PF305.
MAINTENANCE
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.
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.
WIRING DIAGRAMS
Ground
Heater Bank
1Ø Motor
Heater
Wiring Comp't
Baffle
For 3 Phase Only
This Wiring
by Customer
Thermostat When Used
Control Source for
Separately Wired Motors
120 or 240 Volts, 60 Cycle
1 or 3 Phase 60 Hz
Power Supply 120, 208
or 240 Volts
}
Fused
Switch
F1
F2
L1
L2
L3
Fused
Switch
Contactor
When Heater and
Motor Voltage are similar
Figure 3
Use with:
UB-502D
120V, 1Ø
208V, 1Ø or 3Ø
240V, 1Ø or 3Ø
UB-752D
208V, 3Ø
240V, 3Ø
Ground
Heater Bank
1Ø Motor
Heater
Wiring Comp't
Baffle
For 3 Phase Only
This Wiring
by Customer
Thermostat When Used
Control Source for
Separately Wired Motors
120 or 240 Volts, 60 Cycle
1 or 3 Phase 60 Hz
Power Supply 208, 240
or 480 Volts
Cutout
}
Fused
Switch
F1
F2
T1
L1
L2
L3
Fused
Control Switch
Contactor
Figure 4
Use with:
UB-502D &
UB-752D
480V, 1Ø or 3Ø
UB-752D
208V, 1Ø
208V, 1Ø
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