4
UB
(Supersedes PF423-3)
PF423-4
161-027048-001
JULY, 2002
Type UB-2502A and UB-3002A
Forced-Air Heater
Figure 1
Figure 2
(Wall Mounted)
(Ceiling Mounted)
Specifications – Table A
Model
Horizontal
Wt.
(Lbs.)
Air
Volts and Phase
kW
Discharge
240V, 550V, 575V, 600V (3ø)
480V (1ø or 3ø)
UB-2502A
UB-3002A
25
30
48’
48’
185
185
240V, 550V, 575V, 600V (3ø)
480V (1ø or 3ø)
IMPORTANT
Do not mount mercury type thermostat directly on unit. Vibration
could cause heater to malfunction.
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.
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.
© 2010 Chromalox, Inc.
WIRING DIAGRAMS
Figure 4
Figure 5
3
WIRING DIAGRAMS
Figure 6
Figure 7
4
WIRING DIAGRAMS
Figure 8
Figure 9
5
WIRING DIAGRAMS
Figure 10
Figure 11
OPERATION
2. Do not operate heater in corrosive atmosphere conditions to
1. DANGER: Hazard of Fire.
avoid destructive damage to heater.
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.
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.
B. Do not operate heater in areas where combustible lint, dust
or flammable vapors, gases or liquids are present.
6
MAINTENANCE
2. Vacuum heater before activating heater for next heating season
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.
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.
1. Fan motors in these heaters are provided with sealed ball bear-
ings, factory lubricated, requiring no further lubrication under
normal service conditions.
RENEWAL PARTS IDENTIFICATION
1
HEATING ELEMENTS
1
Model
Voltage
Phase
Heating Element
240
480
550
575
600
240
480
550
575
600
3
118-045307-011 (6)
118-045307-012 (6)
118-045307-013 (6)
118-045307-014 (6)
118-045307-015 (6)
118-045307-002 (6)
118-045307-003 (6)
118-045307-007 (6)
118-045307-016 (6)
118-045307-017 (6)
1 or 3
UB-2502A
3
3
3
3
1 or 3
UB-3002A
3
3
3
Note: Number in parentheses ( ) indicates the quantity of that part required.
7
RENEWAL PARTS IDENTIFICATION
2
3
MOTORS AND CAPACITORS
2
3
Motors
Capacitors
Specifications
Specifications
Type Vac Cap.
Oil 370 5 MFD
Oil 370 6 MFD
Manufacturer’s
Cat. No.
Manufacturer’s
Cat. No.
Part No.
Part No.
Volts Amps Phase Cycles RPM HP
193-025776-001
193-025776-002
193-302120-011
HF2K007N
HF2K006N
115 5.4
1
1
3
60 1625 1/3 040-025779-001
60 1625 1/3 040-025779-002
1270
1271
—
230 2.54
P55YYBYV-887 460 0.9
60 1725 1/3
—
—
—
—
TRANSFORMERS
4
5
Voltages
Size
Part Number
V.A. Rating
Primary
Secondary
315-052169-011
315-052169-012
315-304252-001
315-304252-003
220, 230, 240, 440, 460, 480
550, 575, 600
240 & 480
110, 115, 120
110, 115, 120
120
4
Large
970
5
Small
40
575
120
FUSES
6
Fuses — 600 Volt
Fuseholders
Manufacturer’s
Part Number
Amps
Use
Part Number
Description
Cat. No.
128-026510-001
128-026510-004
128-026510-005
128-026510-006
128-027590-001
128-027590-008
128-027590-010
35
40
45
50
1
JKS 35
JKS 40
Power
129-025643-001
600 Volt, 60 Amp, 3 Pole
JKS 45
JKS 50
KTK-R-1
KTK-R-8
KTK-R-15
129-048473-001
129-048475-001
2, 3, 4, 5 poles contact section
Control/
Motor
8
End barrier section for use
with 129-048473-001
15
PARTS COMMON TO ALL HEATERS
7
8
13
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
14
15
16
Thermostat (Optional) . . . . . . . . . . . . . . . . 300-026604-001
Contactor . . . . . . . . . . . . . . . . . . . . . . . . . . 072-304551-008
Auxiliary Contact . . . . . . . . . . . . . . . . . . . . 072-304551-101
9
10
11
12
Limited Warranty:
Please refer to the Chromalox limited warranty applicable to this product at
2150 N. RULON WHITE BLVD., OGDEN, UT 84404
Phone: 1-800-368-2493
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