Chromalox PG421-1 User Manual

PG421-1

U-RAD

161-058006-001

APRIL, 2005

4

and

Installation, Operation

RENEWAL PARTSIDENTIFICATION

(Supersedes PG421)

Type U-RAD-LT Electric Radiant Heaters

© 2010 Chromalox, Inc.

Housing

Mounting
Clamp
Assembly

Terminal Box

Cover

Terminal Box

Element

Polished Aluminum Reflector

Figure 1 — Heater Parts and Dimensions

Before Installing

1. Open carton and remove heater at the place of installation.

Mounting clamps are in parts bag in carton.

2. Check nameplate volt and watt rating against your power sup-

ply voltage and heating requirements of your installation. This
nameplate is located on one end of the heater.

The system designer is responsible for the safety
of this equipment and should install adequate
back-up controls and safety devices with their
electric heating equipment. Where the conse­quences of failure could result in personal injury or
property damage, back-up controls are essential.

Double Element U-RAD-LT

Single Element U-RAD-LT

AB

Overall Heated

Model Volts Watts Length (In.) Length (In.)

Single U-Shaped Element

U-RAD-2LT 120 or 240

0800 13

5

/16 87/16

U-RAD-2VLT 208 or 275
U-RAD-3LT 120 or 240

1100 16

7

/16 115/16

U-RAD-3VLT 208 or 275
U-RAD-4VLT 208 or 275

1800 24

3

/8 193/8

U-RAD-4LT 240 or 480
U-RAD-5VLT 208 or 275

2500 31

13

/16 2613/16

U-RAD-5LT 240 or 480
U-RAD-6VLT 208 or 275

3000 37

13

/16 3213/16

U-RAD-6LT 240 or 480
U-RAD-7VLT 208 or 275

3600 43

15

/16 3815/16

U-RAD-7LT 240 or 480

Two U-Shaped Elements

U-RAD-22LT 120 or 240

1600 26

1

/8 165/8

U-RAD-22VLT 208 or 275
U-RAD-32LT 120 or 240

1900 29

1

/4 193/4

U-RAD-32VLT 208 or 275
U-RAD-33LT 120 or 240

2200 32

3

/8 227/8

U-RAD-33VLT 208 or 275
U-RAD-42VLT 208 or 275

2600 37

1

/8 2711/16

U-RAD-42LT 240
U-RAD-43VLT 208 or 275

2900 40

1

/4 3013/16

U-RAD-43LT 480
U-RAD-44VLT 208 or 275

3600 48

1

/8 383/4

U-RAD-44LT 240 or 480
U-RAD-52VLT 208 or 275

3300 44

5

/8 351/8

U-RAD-52LT 240
U-RAD-53VLT 208 or 275

3600 47

3

/4 381/4

U-RAD-53LT 240
U-RAD-54VLT 208 or 275

4300

55

5

/8 463/16

U-RAD-54LT 240 or 480
U-RAD-55VLT 208 or 275

5000 63

1

/8 535/8

U-RAD-55LT 240 or 480
U-RAD-62VLT 208 or 275

3800 50

9

/16 411/8

U-RAD-62LT 240
U-RAD-63VLT 208 or 275

4100 53

11

/16 441/4

U-RAD-63LT 240
U-RAD-64VLT 208 or 275

4800 61

9

/16 523/16

U-RAD-64LT 240 or 480
U-RAD-65VLT 208 or 275

5500 69

1

/16 595/8

U-RAD-65LT 240 or 480
U-RAD-66VLT 208 or 275

6000 75 65

5

/8

U-RAD-66LT 240 or 480
U-RAD-72VLT 208 or 275

4400 56

11

/16 471/4

U-RAD-72LT 240
U-RAD-73VLT 208 or 275

4700 59

13

/16 503/8

U-RAD-73LT 240
U-RAD-74VLT 208 or 275

5400 67

11

/16 585/16

U-RAD-74LT 240 or 480
U-RAD-75VLT 208 or 275

6100 75

3

/16 6511/16

U-RAD-75LT 240 or 480
U-RAD-76VLT 208 or 275

6600 81

7

/16 721/16

U-RAD-76LT 240 or 480
U-RAD-77VLT 208 or 275

7200 87

1

/4 777/8

U-RAD-77LT 240 or 480

Specifications Table —

A

B

311/16”

41/4” Dia.

(Typ.)

B

A

3

/4” Pipe Tap on
Back Side of
Heater (Typ.)

The Safety Alert Symbol is used to indicate a risk of per­sonal injury.

Please familiarize yourself with these instructions before
attempting to install or operate this Radiant Heater.

!

ELECTRIC SHOCK HAZARD. Disconnect all power
before installing or servicing heater. Failure to do
so could result in personal injury or property dam­age. Heater must be installed or serviced by a
qualified person in accordance with the National
Electrical Code, NFPA 70.

1. Clamps — Heaters are mounted by means of the mounting

clamp and

3

/8” bolt assembly which is used as shown in Fig. 2.
Clamp assembly may be attached to heater by sliding over end
or by snapping over top of extruded frame section at any point
along its length (see Fig. 3). For proper heater support, the
maximum distance between clamps must not exceed 48”. On
extra-long heaters, more than two clamps are furnished.

2. Mounting Holes — When heaters are mounted adjacent to

each other in the same plane, note that distance between
mounting holes on framing to support heaters will be 4

1

/4” min-
imum. When heaters are not in the same plane, i.e., set at an
angle to one another, distance between mounting holes in fram­ing will be either greater or less than 4

1

/4”.

3. Framing — Where an extensive installation is being made, the

use of continuous slot metal framing manufactured by several
concerns will be of assistance in saving time and money. The
framing is reusable.

4. Reflector Spacer Sheets — Where heaters are not mounted side

by side (see Fig. 4), reflector spacer sheets can be used between
heaters. These reflector spacer sheets and companion reflectors
consisting of an extruded aluminum housing with reflector sheet
and mounting clamps are available. Check factory.

5. Insulation — Where unusually high work temperatures are

encountered, it may be desirable to insulate behind heaters with
high-temperature fibrous insulation. A suggested method of
accomplishing this is indicated in Fig. 4.

6. Ventilation — Where solvents, water, etc. are being evaporat-

ed from work in process, it is necessary to provide substantial
quantities of ventilation air to carry away the resulting vapors.

FIRE HAZARD. Since Radiant heaters are capable
of developing high temperatures, extreme care
should be taken to:
A. Keep combustible materials at least 6” away

form sides and back of heater housing and its
supporting brackets and spaced far enough in
front of heater (heating element side) so thermal
radiation from the elements will not ignite com­bustible materials.

B. If combustible materials are being processed,

stoppage of process should initiate immediate
heater shutdown and interception of residual
heat from radiant heaters (use radiation baffles
or move heaters away from work).

C. In the case of solvents of an explosive nature,

ventilation air must be in sufficient volume to
dilute the solvent vapor so that explosive mix­tures cannot occur, refer to NFPA 86, Standard
for Ovens and Furnaces.

WIRING

ELECTRIC SHOCK HAZARD. Disconnect all power
before installing or servicing heater. Failure to do
so could result in personal injury or property dam­age. Heater must be installed or serviced by a
qualified person in accordance with the National
Electrical Code, NFPA 70.

ELECTRIC SHOCK HAZARD. Any installation
involving electric heaters must be performed by a
qualified person and must be effectively grounded
in accordance with the National Electrical Code to
eliminate shock hazard.

1. Electrical connection to the Radiant Heater is made through the

3

/4” diameter conduit opening in the terminal box.

2. Access to Radiant Heater terminals is obtained by removing

the terminal box cover.

3. Wiring should be run in flexible or rigid metal conduit and

must be installed in accordance with the requirements of the
National Electrical Code and such other local requirements as
may be applicable. Note: High temperatures will oxidize cop­per. Do not use copper wire in connecting this heater. Stranded,
insulated, nickel-plated copper wire is recommended.

4. Wires supplying power to heating element terminals shall have

insulation rated for 150°C minimum.

High Temperatures will oxidize copper. Use only nickel­plated copper wire for supplying power to heater. Do not
use aluminum conductors.

5. A sufficient length of this wire (not less than 12”) should be

used to extend from each heater terminal into a connection box
location where the temperature does not exceed 300°F.

6. Assemble terminal, screw and wire as shown in Fig. 5.

7. Hold terminal with pliers and tighten the terminal screw

securely with a screwdriver.
Note: Where circuit wiring is installed in locations of high
ambient temperature, conductors should be insulated in accor­dance with requirements for temperature and voltage.

Mounting Frame

Reflector
Spacer Sheet

Insulation

Figure 4

Figure 5

1 / "

8

7

2 / "

3

8

3 / "

11

16

INSTALLATION

Figure 2 Figure 3