Chromalox UB-502D User manual

DIVISION

SECTION

SALES

REFERENCE

DATE

SERVICE REFERENCE

Installation, Operation

and

RENEWAL PARTS IDENTIFICATION

PF416-13

JULY, 2002

(Supersedes PF416-12)

161-048444-001

MOUNTING

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 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 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 nec-

essary 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 nor-

mal 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 heat-

ing equipment. Where the consequences of failure

may be severe, back-up controls are essential.

Although the safety of installation is the responsi-

bility 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 tempera-

tures could cause a fire.

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 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 operat-

ing 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 vacu-

umed before start-up, to remove accumulated combustible par-

ticles 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

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

Fused

Control Switch

Contactor

Figure 4

Use with:

UB-502D &

UB-752D

480V, 1Ø or 3Ø

UB-752D

208V, 1Ø

WIRING DIAGRAMS

}

Alternate 240V Wiring

Integral 480V/240V

or 120V Transformer

Thermal

Cutout

Ground

Heater Bank

1Ø Motor

Heater

Wiring Comp't

Baffle

For 3 Phase Only

120V Wiring

X1 X3 X2 X4

H1 H2

This Wiring

by Customer

Control

Switch Optional

Thermostat

When Used

Contactor

Fused

Switch

1 or 3 Phase 60 Hz

Power Supply 480 Volts

Figure 5

Use with:

UB-502D-T &

UB-752D-T

480V, 1Ø or 3Ø

Integral

Contactor

Ground

Heater Bank

1Ø Motor

Heater

Wiring Comp't

Baffle

For 3 Phase Only

}

This Wiring

by CustomerThermostat

When Used

Control

Source 120 or

240 Volts, 60 Cycle

1 or 3 Phase 60 Hz Power

Supply 208, 240 or 480 Volts

Fused

Switch

Cutout

Fused

Control Switch

Figure 6

Use with:

UB-502D-R &

UB-752D-R

480V, 1Ø or 3Ø

Alternate 240V Wiring

Integral 480V/240V

or 120V Transformer

Integral

Contactor

Ground

Heater Bank

1Ø Motor

Heater

Wiring Comp't

Baffle

For 3 Phase Only

120V Wiring

X1 X3 X2 X4

H1 H2

}

This Wiring

by Customer

Thermostat

When Used

Control

Switch Optional

1 or 3 Phase 60 Hz Power

Supply 480 Volts

Fused

Switch

Cutout

Figure 7

Use with:

UB-502D-TR &

UB-752D-TR

480V, 1Ø or 3Ø

Integral

Contactor

Ground

Heater Bank

1Ø Motor

Heater

Wiring Comp't

Baffle

For 3 Phase Only

}

This Wiring

by Customer

Thermostat

When Used

1 or 3 Phase 60 Hz

Power Supply 208 or 240 Volts

Fused

Switch

Cutout

Figure 8

Use with:

UB-502D-R

208V, 1Ø or 3Ø

240V, 1Ø or 3Ø

UB-752D-R

208V, 3Ø

240V, 3Ø

RENEWAL PARTS IDENTIFICATION

‡ Note: Only one thermal cutout is used if a Transformer and/or Relay is used.

Note: Part numbers suffixed by a number in ( ) indicates quantity of same part number used.

* Fusing Parts Part Number

Fuse 3 Amp 600V KTK-3 128-047763-007 (2)

Fuse Block Barrier 129-048475-001 (1)

Fuse Block 129-048473-001 (2)

12MOTORS 348

Volts Phase Heating

120V 208V 240V Fan Thermal Transformer

Element Cutout

UB-502D 120 1 118-045259-001 (3) 193-302120-009 ————— ————— 112-045408-006 300-049200-006 (3) —————

UB-502D 208 1 or 3 118-045259-002 (3) 193-302120-009 193-302120-009 ————— 112-045408-006 300-049200-006 1ø (2) ‡ —————

300-049200-006 3ø (3) ‡

UB-502D 240 1 or 3 118-045259-003 (3) 193-302120-009 ————— 193-302120-009 112-045408-006 300-049200-006 1ø (2) ‡ —————

300-049200-006 3ø (3) ‡

UB-502D* 480 1 or 3 118-045259-004 (3) 193-302120-009 ————— 193-302120-009 112-045408-006 300-049200-006 (1) 315-303675-001

UB-752D 208 1 or 3 118-045259-006 (3) 193-302120-009 193-302120-009 ————— 112-045408-005 300-049200-006 1ø (1) —————

300-049200-006 3ø (3) ‡

UB-752D 240 1 or 3 118-045259-007 (3) 193-302120-009 ————— 193-302120-009 112-045408-005 300-049200-006 1ø (1) —————

300-049200-006 3ø (3) ‡

UB-752D* 480 1 or 3 118-045259-008 (3) 193-302120-009 ————— 193-302120-009 112-045408-005 300-049200-006 (1) 315-303675-001

Wall Bracket Set . . . . . . . . . . . . . . . . . . . . . . . . . .168-026844-002

Ceiling Mounting Support Set (Includes ) . . . .027-044419-002

Ceiling Suspension Bracket . . . . . . . . . . . . . .027-033363-001 (2)

Louver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .182-047073-002

Motor Mounting Frame . . . . . . . . . . . . . . . . . . . .194-045254-001

Grille . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .134-119147-002

PARTS COMMON TO ALL HEATERS

RENEWAL PARTS IDENTIFICATION

9 RELAYS

Model Volts Phase Motor Relay

UB-502D 208 1 120V 072-303180-011

UB-502D 208 1 208V 072-303180-016

UB-502D 208 3 120V 072-303180-007

UB-502D 208 3 208V 072-303180-013

UB-502D 240 1 120V 072-303180-011

UB-502D 240 1 240V 072-303180-016

UB-502D 240 3 120V 072-303180-007

UB-502D 240 3 240V 072-303180-013

UB-502D 480 1 120V 072-303180-011

UB-502D 480 1 240V 072-303180-016

UB-502D 480 3 120V 072-303180-007

UB-502D 480 3 240V 072-303180-013

UB-752D 208 1 120V ——————

UB-752D 208 1 208V ——————

UB-752D 208 3 120V 072-303180-007

UB-752D 208 3 208V 072-303180-013

UB-752D 240 1 120V ——————

UB-752D 240 1 240V ——————

UB-752D 240 3 120V 072-303180-007

UB-752D 240 3 240V 072-303180-013

UB-752D 480 1 120V 072-303180-011

UB-752D 480 1 240V 072-303180-016

UB-752D 480 3 120V 072-303180-007

UB-752D 480 3 240V 072-303180-013

2150 N. RULON WHITE BLVD., OGDEN, UT 84404

Phone: 1-800-368-2493 www.chromalox.com

Limited Warranty:

Please refer to the Chromalox limited warranty applicable to this product at

http://www.chromalox.com/customer-service/policies/termsofsale.aspx.

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