Chromalox UB-2502A User manual

(Supersedes PF423-3)
PF423-4
UB
161-027048-001
JULY, 2002
4
and
Installation, Operation
RENEWAL PARTS IDENTIFICATION
Type UB-2502A and UB-3002A
Forced-Air Heater
© 2010 Chromalox, Inc.
IMPORTANT
Specifications – Table A
Horizontal
Air Wt.
Model Volts and Phase kW
Discharge (Lbs.)
UB-2502A 240V, 550V, 575V, 600V (3ø) 25 48’ 185
480V (1ø or 3ø)
UB-3002A 240V, 550V, 575V, 600V (3ø) 30 48’ 185
480V (1ø or 3ø)
WARNING: Hazard of Electric Shock. Disconnect
all power before installing heater.
WARNING: 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 PDS CXH-EP
(PF305).
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 installation is the
responsibility of the user, Chromalox will be glad to
make equipment recommendations.
Do not mount mercury type thermostat directly on unit. Vibration
could cause heater to malfunction.
The heater must be mounted at least 7’ above the floor to prevent
accidental contact with the heating elements or fan blade which
could cause injury.
Keep at least 5’ clearance in front of the heater. Refer to Figures 1
and 2 for side, top and back clearance requirements.
The wall or ceiling mounting structure and the anchoring provision
must be of sufficient strength to support the combined weight of
the heater and mounting bracket. (Refer to Table A for weights of
heater and bracket).
Fan blade rotation must be checked. If airflow is not moving out
through the louvers, interchange any two of the three customer
power leads on three-phase units only.
Figure 1
(Wall Mounted)
Figure 2
(Ceiling Mounted)

MOUNTING
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
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 11).
Note: Be sure to check the voltage rating of the fan motor since
it is not necessarily the same as the heater circuit.
2. If an external transformer is used to step down the voltage for
operating the fan motor, use appropriate wiring diagram (Figures
8 thru 11).
3. Heaters are not provided with a control switch and should be
controlled by externally mounted disconnect switches and/or
separately mounted thermostat and control switch as recom-
mended in appropriate wiring diagrams (Figures 3 thru 11).
Key to proper wiring diagram is the part number (P/N) of inter-
nal wiring diagram located on inside of the hinged cover of the
terminal box.
4. Protection against overheating is provided by an internal auto-
matic thermal cutout which opens the electric circuit if the nor-
mal air-flow is restricted or stopped. Cutout automatically
energizes heater on removal of the obstruction.
WARNING: Hazard of Electric Shock. Disconnect all
power before installing heater.
WARNING: 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 under-
side of heater.
B. For ceiling heights of 12 feet or less, maximum mounting
height is determined by use of ceiling mounting brackets
offered with these heaters. Minimum spacing to ceiling is
14-1/4”.
C. In either case, the 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 11” minimum.
B. Side of case to side wall 12” minimum.
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 mount-
ed at shoulder height on inside walls or columns.
WIRING
2
Figure 3
WIRING DIAGRAMS

WIRING DIAGRAMS
Figure 4
3
Figure 5

4
WIRING DIAGRAMS
Figure 6
Figure 7

5
WIRING DIAGRAMS
Figure 8
Figure 9

6
WIRING DIAGRAMS
Figure 10
Figure 11
OPERATION
1. DANGER: Hazard of Fire.
A. Do not restrict air flow through heater by placing fabric or
other obstructions in front of or behind the heater.
Increased discharge temperatures can discolor or ignite
some heat sensitive combustible materials.
B. Do not operate heater in areas where combustible lint, dust
or flammable vapors, gases or liquids are present.
2. Do not operate heater in corrosive atmosphere conditions to
avoid destructive damage to heater.
3. Avoid operating heater in dusty environment which can foul
heater fins to dissipate heat or impair motor ventilation leading
to excessive operating temperatures.
4. Do not operate heater in ambient temperatures exceeding 90OF.

7
MAINTENANCE
WARNING: Turn off all power to service heater. Do
not attempt to service heater while unit is operat-
ing as there is hazard of electric shock, injury from
operating fan, and burns from hot heating ele-
ments.
1. Fan motors in these heaters are provided with sealed ball bear-
ings, factory lubricated, requiring no further lubrication under
normal service conditions.
2. Vacuum heater before activating heater for next heating season
to remove accumulated dust or lint 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.
RENEWAL PARTS IDENTIFICATION
Model Voltage Phase Heating Element
240 3 118-045307-011 (6)
480 1 or 3 118-045307-012 (6)
UB-2502A 550 3 118-045307-013 (6)
575 3 118-045307-014 (6)
600 3 118-045307-015 (6)
240 3 118-045307-002 (6)
480 1 or 3 118-045307-003 (6)
UB-3002A 550 3 118-045307-007 (6)
575 3 118-045307-016 (6)
600 3 118-045307-017 (6)
1
1HEATING ELEMENTS
Note: Number in parentheses ( ) indicates the quantity of that part required.

2150 N. RULON WHITE BLVD., OGDEN, UT 84404
Phone: [phone] www.chromalox.com
RENEWAL PARTS IDENTIFICATION
Fuses — 600 Volt Fuseholders
Manufacturer’s
Part Number Amps Cat. No. Use Part Number Description
128-026510-001 35 JKS 35
128-026510-004 40 JKS 40 Power 129-025643-001 600 Volt, 60 Amp, 3 Pole
128-026510-005 45 JKS 45
128-026510-006 50 JKS 50
128-027590-001 1 KTK-R-1 Control/ 129-048473-001 2, 3, 4, 5 poles contact section
128-027590-008 8 KTK-R-8 Motor 129-048475-001 End barrier section for use
128-027590-010 15 KTK-R-15 with 129-048473-001
Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112-027567-001
Fan Delay . . . . . . . . . . . . . . . . . . . . . . . . . . 300-048038-001
Cutout . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300-049602-008
Manual Reset Cutout (Optional) . . . . . . . . . 300-117647-006
Grille . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134-119147-003
Louver Assembly . . . . . . . . . . . . . . . . . . . . 182-047073-003
Mounting Bracket - (Right Hand) . . . . . . . . 027-025836-001
(Left Hand) . . . . . . . . . 027-025836-002
Thermostat (Optional) . . . . . . . . . . . . . . . . 300-026604-001
Contactor . . . . . . . . . . . . . . . . . . . . . . . . . . 072-304551-008
Auxiliary Contact . . . . . . . . . . . . . . . . . . . . 072-304551-101
16
11
12
13
10
14
15
9
8
7
3MOTORS AND CAPACITORS
6FUSES
2
Voltages
Size Part Number V.A. Rating Primary Secondary
Large 315-052169-011 970 220, 230, 240, 440, 460, 480 110, 115, 120
315-052169-012 550, 575, 600 110, 115, 120
Small 315-304252-001 40 240 & 480 120
315-304252-003 575 120
TRANSFORMERS
5
4
5
4
PARTS COMMON TO ALL HEATERS
Motors Capacitors
Manufacturer’s Specifications Manufacturer’s Specifications
Part No. Cat. No. Volts Amps Phase Cycles RPM HP Part No. Cat. No. Type Vac Cap.
193-025776-001 HF2K007N 115 5.4 1 60 1625 1/3 040-025779-001 1270 Oil 370 5 MFD
193-025776-002 HF2K006N 230 2.54 1 60 1625 1/3 040-025779-002 1271 Oil 370 6 MFD
193-302120-011 P55YYBYV-887 460 0.9 3 60 1725 1/3 — — — — —
23
Limited Warranty:
Please refer to the Chromalox limited warranty applicable to this product at
http://www.chromalox.com/customer-service/policies/termsofsale.aspx.