Chromalox PF497-1 User Manual

DATE

SALES

REFERENCE

DIVISION SECTION

Chromalox

®

(Supersedes PG422-1)

PF497-1

DRA

161-304812-001

NOVEMBER, 2002

4

RENEWAL PARTS IDENTIFICATION

Installation, Operation

and

(Supersedes PF-497)

© 2010 Chromalox, Inc.

Specifications – Table 1

GENERAL

IMPORTANT:
SAVE THESE INSTRUCTIONS

Risk of fire. Do not use as a residential or house­hold heater.

Hazard of Fire or Discoloration of Temperature
Sensitive Fabrics. Do not use as a residential or
household heater. Keep combustible material and

such fabrics away from heater. Do not operate
heater where flammable vapors, gases or liquids
are present. Heaters in the heat mode should not
be operated in room temperatures above 80°F. Fan
motor is not designed to operate in ambients below

-40°F.

To avoid personal injury read “IMPORTANT
INSTRUCTIONS” on page 2 before installation or
operation of heater.

Keep electrical cords and combustible materials,
such as drapes and other furnishings, away from
heater.

Electrical Data (60 Hz) Dimensions (In.)

Model

Volts kW Phase Amps* 1/3 PhBTUHeight Width Depth

DRA-07-83 208 7.5 1 and 3 36.3/21.0 25,590 34.25 27.5 25
DRA-07-23 240/208 7.5/5.6 1 and 3 31.5/18.3** 25,590 34.25 27.5 25
DRA-10-83 208 9.75 1 and 3 47.1/27.3 33,267 34.25 27.5 25
DRA-10-23 240/208 9.75/7.3 1 and 3 40.8/23.7** 33,267 34.25 27.5 25
DRA-15-83 208 15 3 41.8 51,180 34.25 27.5 25
DRA-15-23 240/208 15/11.2 3 36.3** 51,180 34.25 27.5 25
DRA-15-43 480 15 1 and 3 31.4/18.2 51,180 34.25 27.5 25
DRA-15-63 600 15 1 and 3 25.2/14.6 51,180 34.25 27.5 25
DRA-20-23 240/208 19.5/15 3 47.1** 66,534 34.25 27.5 26.5
DRA-20-43 480 20 1 and 3 42.0/24.4 68,240 34.25 27.5 26.5
DRA-20-63 600 20 1 and 3 33.5/19.4 68,240 34.25 27.5 26.5
DRA-30-43 480 30 3 36.3 102,360 34.25 27.5 26.5
DRA-30-63 600 30 3 20.1 102,360 34.25 27.5 26.5

* = Includes motor amps
** = Ratings shown are for 240V, 208V amperage is 86% of 240V value.
Models shown as 1 and 3 phase are factory wired for 3 phase operation and can be field wired for single phase.

Portable Industrial

Unit Blower Air Heater

Type DRA

2

IMPORTANT INSTRUCTIONS

When using electrical appliances, basic precautions should always
be followed to reduce the risk of fire, electric shock and injury to
persons, including the following:

1. Read all instructions before using this heater.

2. This heater is hot when in use. To avoid burns, do not let bare

skin touch hot surfaces. If provided, use handles when moving
this heater. Keep combustible materials, such as furniture, pil­lows, bedding, papers, clothes, and curtains at least 3 feet (0.9 m)
from the front of the heater and keep them away from the sides
and rear.

3. Extreme caution is necessary when any heater is used by or

near children or handicapped individuals and whenever the
heater is left operating and unattended.

4. Always disconnect heater when not in use.

5. Do not operate any heater with a damaged cord or plug or after

the heater malfunctions, has been dropped or damaged in any
manner. Return heater to authorized service facility for exami­nation, electrical or mechanical adjustments, or repair.

6. Do not use outdoors.

7. This heater is not intended for use in bathrooms, laundry areas

and similar indoor locations. Never locate heater where it may
fall into a bathtub or other water container.

8. Do not run cord under carpeting. Do not cover cord with throw

rugs, runners or the like. Arrange cord away from traffic area
and where it will not be tripped over.

9. To disconnect heater, turn thermostat off, then remove plug

from outlet.

10. Connect to properly grounded outlets only.

11. Do not insert or allow foreign objects to enter any ventilation

or exhaust opening as this may cause an electric shock, fire or
damage the heater.

12. To prevent a possible fire, do not block air intakes or exhaust

in any manner. Do not use on soft surfaces, like a bed, where
opening may become blocked.

13. A heater has hot and arcing or sparking parts inside.Do not use

it in areas where gasoline, paint or flammable liquids are used
or stored.

14. Use this heater only as described in this manual. Any other use

not recommended by the manufacturer may cause fire, electric
shock or injury to persons.

15. This heater is not intended for use with an extension cord.

16.

SAVE THESE INSTRUCTIONS.

ASSEMBLY INSTRUCTIONS

The Chromalox DRA is shipped fully assembled. The handle is
assembled in the lower position (dotted line Fig. 1). To position
handle in the upright position, remove bolts securing the handle to
the support legs, lift handle until the handle holes line up with the
upper holes in the support legs and insert bolts to secure the han­dle in the full upright position.

Tools Required – Crescent Wrench

– Phillips Screwdriver

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 effectively grounded in accor­dance with the National Electrical Code, NFPA 70.

1. Use heater only on the voltage and frequency specified on the

nameplate.

2. All wiring should be done in accordance with local codes and

the National Electrical Code by a qualified person.

3. Branch circuit wire for connection to heater must be at least

90°C wire.

4. The top access panel is secured by 4 screws that must be loos-

ened to gain access.

5. A ground terminal is provided near the power terminal board.

The ground wire should be connected before other connections
are made.

6. Refer to Chart A for proper size “SO” grade cable.

7. A proper strain relief must be used with “SO” grade cable.

8. Dragon heaters are factory pre-wired for 3-phase delta opera-

tion. Some units can be converted to single phase operation by
changing the wiring. Refer to Chart A for those heaters that can
be converted to single phase. The appropriate wiring diagram
is also located on the back of the wiring compartment cover.

Bolt ( )

Nut ( )

Support Leg

Handle

Direction of

Airflow

Figure 1