Chromalox DRA Series User manual

1
PF497-2
161-304812-001
December 2018
Installation and Operation
Instructions
DRA Portable Industrial
Unit Blower Air Heater

2
Risk of fire. Do not use as a residential or household
heater.
Hazard of Fire or Discoloration of Temperature Sen-
sitive Fabrics. Do not use as a residential or house-
hold heater. Keep combustible material and such
fabrics away from heater. Do not operate heater
where flammable vapors, gases or liquids are pres-
ent. Heaters in the heat mode should not be oper-
ated in room temperatures above 80°F. Fan motor
is not designed to operate in ambients below -40°F.
To avoid personal injury read “IMPORTANT INSTRUC-
TIONS” before installation or operation of heater.
Keep electrical cords and combustible materials,
such as drapes and other furnishings, away from
heater.
Table 1 - Specifications
Model
Electrical Data (60 Hz) Dimensions (In.)
Volts kW Phase
Amps*
1/3 PH BTU Height 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.
IMPORTANT: SAVE THESE INSTRUCTIONS

3
General Information
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 when-
ever 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 venti-
lation 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 ex-
haust 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 posi-
tion 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
Bolt ( )
Nut ( )
Support Leg
Handle
Direction of
Airflow
Figure 1

4
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 loosened to gain access.
5. A ground terminal is provided near the power terminal
board. The ground wire should be connected before oth-
er 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 ca-
ble.
8. Dragon heaters are factory pre-wired for 3-phase delta
operation. Some units can be converted to single phase
operation by changing the wiring. Refer to Chart Afor
those heaters that can be converted to single phase. The
appropriate wiring diagram is also located on the back of
the wiring compartment cover.
Table 1 - Specifications
Model kW Volts Phase
Wiring Dia.
No. Amps Wire Size
25’ Cord Set
PCN
Optonal Plugs
Locking Type
Non-Locking
Type
DRA-07-83 7.5 208 1 1A 36.3 8/3 PLC-2508-3 ——— PGN-6-50
DRA-07-83 7.5 208 3 1 21.0 10/4 PLC-2510-4 PGL-15-30 PGN-15-50
DRA-07-23 5.6 208 1 1A 27.1 10/3 PLC-2510-3 PGL-15-30 PGN-6-50
DRA-07-23 5.6 208 3 1 15.7 12/4 PLC-2512-4 PGL-15-20 PGN-15-20
DRA-07-23 7.5 240 1 1A 31.5 8/3 PLC-2508-3 ——— PGN-6-50
DRA-07-23 7.5 240 3 1 18.2 12/4 PLC-2512-4 PGL-15-20 PGN-15-20
DRA-10-83 9.75 208 1 1A 47.1 6/3 PLC-2506-3 ——— PGN-6-50
DRA-10-83 9.75 208 3 1 27.2 8/4 PLC-2508-4 PGL-15-30 PGN-15-50
DRA-10-23 7.3 208 1 1A 35.4 8/3 PLC-2508-3 ——— PGN-6-50
DRA-10-23 7.3 208 3 1 20.4 10/4 PLC-2510-4 PGL-15-30 PGN-15-50
DRA-10-23 9.75 240 1 1A 40.8 6/3 PLC-2506-3 ——— PGN-6-50
DRA-10-23 9.75 240 3 1 23.6 10/4 PLC-2510-4 ——— PGN-15-50
DRA-15-83 15 208 3 1 41.8 6/4 PLC-2506-4 ——— PGN-15-50
DRA-15-23 11.2 208 3 1 31.4 8/4 PLC-2508-4 ——— PGN-15-50
DRA-15-23 15 240 3 1 38.3 6/4 PLC-2506-4 ——— PGN-15-50
DRA-15-43 15 480 1 2A 31.5 8/3 PLC-2508-3 PGL-3763C ———
DRA-15-43 15 480 3 2 18.2 12/4 PLC-2512-4 PGL-16-30 ———
DRA-15-93 15 600 1 2A 25.2 10/3 PLC-2510-3 PGL-3763C ———
DRA-15-93 15 600 3 2 14.6 14/4 PLC-2514-4 PGL-17-30 ———
DRA-20-23 15 208 3 3 41.8 6/4 PLC-2506-4 ——— PGN-15-50
DRA-20-23 20 240 3 3 48.3 4/4 PLC-2504-4 ——— PGN-15-50
DRA-20-43 20 480 1 4A 41.9 6/3 PLC-2506-3 PGL-3763C ———
DRA-20-43 20 480 3 4 24.4 10/4 PLC-2510-4 PGL-17-30 ———
DRA-20-93 20 600 1 4A 33.5 8/3 PLC-2508-3 PGL-3763C ———
DRA-20-93 20 600 3 4 19.4 12/4 PLC-2512-4 PGL-17-30 ———
DRA-30-43 30 480 3 4 36.3 6/4 PLC-2506-4 PGL-3764C ———
DRA-30-93 30 600 3 4 29.1 8/4 PLC-2508-4 PGL-17-30 ———
Power Cord based on 600V Hard Service Cord Rated 90°C
Plug selection is based on using Chromalox Cable Kits

5
Plug Selection
Fits Cable Dia. Plug Type Model Description Volts Amps Configuration NEMA # ANSI #
.385”-.780” Locking PGL-15-20 3 Pole, 4 Wire 250 20
G
G
W
X
Z
G
W
XZ
X
G
Y
Z
X
G
Y
Z
X
G
Y
Z
X
G
Y
Z
Y
X
G
Y
X
Z
L15-20 C73.85
.385”-.780” Locking PGL-15-30 3 Pole, 4 Wire 250 30
G
G
W
X
Z
G
W
XZ
X
G
Y
Z
X
G
Y
Z
X
G
Y
Z
X
G
Y
Z
Y
X
G
Y
X
Z
L15-30 C73.86
.595”-1.150” Locking PGL-16-30 3 Pole, 4 Wire 480 30
G
G
W
X
Z
G
W
XZ
X
G
Y
Z
X
G
Y
Z
X
G
Y
Z
X
G
Y
Z
Y
X
G
Y
X
Z
L16-30 C73.88
.595”-1.150” Locking PGL-17-30 3 Pole, 4 Wire 600 30
G
G
W
X
Z
G
W
XZ
X
G
Y
Z
X
G
Y
Z
X
G
Y
Z
X
G
Y
Z
Y
X
G
Y
X
Z
L17-30 C73.89
.750”-1.125” Locking PGL-3763C 2 Pole, 4 Wire 600 50
G
G
W
X
Z
G
W
XZ
X
G
Y
Z
X
G
Y
Z
X
G
Y
Z
X
G
Y
Z
Y
X
G
Y
X
Z
— —
.750”-1.125” Locking PGL-3765C 3 Pole, 4 Wire 600 50
G
G
W
X
Z
G
W
XZ
X
G
Y
Z
X
G
Y
Z
X
G
Y
Z
X
G
Y
Z
Y
X
G
Y
X
Z
— —
.625”-1.187” Non Locking PGN-6-50 2 Pole, 3 Wire 250 50
G
G
W
X
Z
G
W
XZ
X
G
Y
Z
X
G
Y
Z
X
G
Y
Z
X
G
Y
Z
Y
X
G
Y
X
Z
6-50 C73.53
.390”-.775” Non Locking PGN-15-20 3 Pole, 4 Wire 250 20
G
G
W
X
Z
G
W
XZ
X
G
Y
Z
X
G
Y
Z
X
G
Y
Z
X
G
Y
Z
Y
X
G
Y
X
Z
15-20 C73.59
.750”-1.250” Non Locking PGN-15-50 3 Pole, 4 Wire 250 50
G
G
W
X
Z
G
W
XZ
X
G
Y
Z
X
G
Y
Z
X
G
Y
Z
X
G
Y
Z
Y
X
G
Y
X
Z
15-50 C73.61
The above plugs are designed to be used with specific ranges of cable diameters. If not used with Chromalox Cable Kits, check cable manufacturers cable diameter
to be sure plug fits selected cable.

6
Wiring
Cord Preparation for Chromalox Portable Heaters
1. Determine the gage and number of conductors from the
tabulation below using amps and phase from the heater
nameplate.
It is not recommended that cord exceed 50 feet in length.
Max. Heater
Amps
Chromalox
Cord Kit
Model No.*
Cord Ga/No. Cond. & Type
1 Phase 3 Phase
15 PLC-2514-4 14/4 SO
20 PLC-2512-4 12/4 SO
30 PLC-2510-3 10/3 SO
25 PLC-2510-4 10/4 SO
40 PLC-2508-3 8/3 SO
35 PLC-2508-4 8/4 SO
55 PLC-2506-3 6/3 SO
45 PLC-2506-4 6/4 SO
60 PLC-2504-4 4/4 SO
*Includes 90 degree fitting and 25 foot of cord, reducers and locknut
2. Strip off outer jacket of cord and insulation from lead
wires. The tabulation below provides the strip dimen-
sions for the various Chromalox portable heaters. See
the nameplate on the heater for the Model number.
Model No. A B C
DRA - (all suffixes) 8” 1” 0.5”
"A"
"B" (Insulation strip dimension for ground wire).
"C" (Insulation strip dimension for power wires).
3. Slide fitting onto cord and tighten knurled nut to secure
fitting to cord.
4. Select plug to match electrical rating of cord.
5. On opposite end of cord prepare end as directed by in-
structions that are provided with the plug.
6. Attach cord assembly to heater as shown in Fig. 2 below:
Run wire tie through slots in bracket
and over cord. Pull tab of wire tie to
provide cord strain relief.
Power
wires
Ground
wire
90° fitting
Figure 2
Operation
Thermostat
Heaters include a bimetal thermostat for the automatic con-
trol of the exiting air temperature. The thermostat knob con-
trols the heating elements and fan functions. The heater and
fan are deenergized with the knob in the extreme clockwise
position.
Turning the knob clockwise from the off position to the fan
position will energize the fan only, for use in summer cooling.
The adjustment knob controls power to the heater and fan
when turned further in the clockwise direction, with the high-
est temperature setting in the extreme clockwise position.
The temperature setting in the heater mode is approximately
40°F in the low setting and 100°F at the highest setting.
NOTE: The adjustment knob should be turned to the fan only
setting after use for heating. The fan should be left on for at
least 3 minutes to remove residual heat from the unit and to
prevent overheating of the housing.

7
Wiring Diagrams
Diag. 1 – FACTORY WIRED 3 PHASE
Diag. 2 – FACTORY WIRED 3 PHASE
Diag. 4 – FACTORY WIRED 3 PHASE
Diag. 1a – FIELD CONVERSION TO 1 PHASE
Diag. 2a – FIELD CONVERSION TO 1 PHASE
Diag. 4a – FIELD CONVERSION TO 1 PHASE
Diag. 3 – FACTORY WIRED 3 PHASE
T3
T2
T1
L3
L2
L1
2
13
Thermostat
Cord by others. Type "SO" or equal
sized to meet nameplate
requirements
4
1
3
5
6
Front of
Heater
6
5
4
3
2
1
Red
Motor
Blu Blk
Wht
Cutout
6
4
T2
T1
L2
L1
2
Cord by others. Type "SO" or equal
sized to meet nameplate
requirements
4
1
3
5
6
Front of
Heater
6
5
4
3
2
1
All control wiring
same as Diag. 1
Instructions:
1. Loosen screws on load side of contactor. Remove all lead wire.
2. Insert lead wires numbers 1, 3, and 5 into box lug connector "T1". Tighten screws
on box lug connector.
3. Insert lead wires numbers 2, 4, and 6 into box lug connector "T2". Tighten screws
on box lug connector.
4. Examine wiring to make certain it is per above diagram.
T3
T2
T1
L3
L2
L1
2
13
Thermostat
Cord by others. Type "SO" or equal
sized to meet nameplate
requirements
4
1
3
5
6
Front of
Heater
6
5
4
3
2
1
Blk/Red or Grey
Motor
Blk
Wht
Cutout
6
4
Contactor 13
5
246
To T3
To T3
To T1 To T2 To T1
To T2
Fan Relay
A2
T2
T1
A1
L2
L1
XFMR
Blk
Black
White
All control wiring
same as Diag. 2
T2
T1
L2
L1
2
Cord by others. Type "SO" or equal
sized to meet nameplate
requirements 4
1
3
5
6
Front of
Heater
6
5
4
3
2
1
All even numbered wires to T2
All odd numbered wires to T1
Contactor
Instructions:
1. Loosen screws on load side of contactor. Remove all lead wire.
2. Insert lead wires numbers 1, 3, and 5 into box lug connector "T1".
Tighten screws on box lug connector.
3. Insert lead wires numbers 2, 4, and 6 into box lug connector "T2".
Tighten screws on box lug connector.
4. Examine wiring to make certain it is per above diagram.
T3
T2
T1
L3
L2
L1
11
13
Thermostat
Cord by others.
Type "SO" or equal
sized to meet nameplate
requirements
9
10
7
8
12
Front of
Heater
10
9
4
3
2
1
Motor
Blue
Cutout
6
4
Contactor
1
3
5
2
4
6
To T3
To T3
To T1
To T2 To T1
To T2
Red
Black
White
6
5
12
11
8
7
T3
T2
T1
L3
L2
L1
11
13
Thermostat
Cord by others.
Type "SO" or equal
sized to meet nameplate
requirements
9
10
7
8
12
Front of
Heater
10
9
4
3
2
1
Blk/Red or Grey
Motor
Blk
Wht
Cutout
6
4
Contactor
1
3
5
2
4
6
To T3
To T3
To T1
To T2 To T1
To T2
Fan Relay
A2
T2
T1
A1
L2
L1
XFMR
Blk
Black
White
6
5
12
11
8
7
10
4
12
9
8
11
10
9
4
3
2
1
All control wiring
same as Diag. 4
T2
T1
L2
L1
Cord by others.
Type "SO" or equal
sized to meet nameplate
requirements
Front of
Heater
All even numbered wires to T2
All odd numbered wires to T1
Contactor
Instructions:
1. Loosen screws on load side of contactor. Remove all lead wire.
2. Insert lead wires numbers 1, 3, 5, 7, 9 and 11 into box lug connector "T1".
Tighten screws on box lug connector.
3. Insert lead wires numbers 2, 4, 6, 8, 10 and 12 into box lug connector "T2".
Tighten screws on box lug connector.
4. Examine wiring to make certain it is per above diagram.
1
3
5
2
7
6
6
5
12
11
8
7

8
Limited Warranty:
Please refer to the Chromalox limited warranty applicable to this product at
http://www.chromalox.com/customer-service/policies/termsofsale.aspx.
© 2016 Chromalox, Inc. All rights reserved.
Chromalox
103 Gamma Drive
Pittsburgh, PA 15238
[phone]
www.chromalox.com
Maintenance
ELECTRIC SHOCK HAZARD. Disconnect heater from
power supply before servicing and/or inspecting the
heater; failure to do so may result in electrical shock.
Replace or repair damaged cords or plugs immediately.
Check tightness of all electrical connections prior to energiz-
ing Dragon. Blow out or vacuum away any dirt or debries that
may have accumulated around the control enclosure fan mo-
tor or heating elements.
Renewal Parts Identification
Model No. Volts kW Phase Element Part No. Motor Part No. Fan Part No
Contactor Part
No. Control Trans
DRA-07-83 208 7.5 1 & 3 118-304793-001 193-302120-009 112-045422-007 072-304551-014 ———
DRA-07-23 240 7.5 1 & 3 118-304793-002 193-302120-009 112-045422-007 072-304551-014 ———
DRA-10-83 208 9.75 1 & 3 118-304793-003 193-302120-009 112-045422-007 072-304551-014 ———
DRA-10-23 240 9.75 1 & 3 118-304793-004 193-302120-009 112-045422-007 072-304551-014 ———
DRA-15-83 208 15 3 118-304793-007 193-302120-009 112-045422-007 072-304551-014 ———
DRA-15-23 240 15 3 118-304793-008 193-302120-009 112-045422-007 072-304551-014 ———
DRA-15-43 480 15 1 & 3 118-304793-009 193-302120-012 112-045422-007 072-304551-008 315-304252-001
DRA-15-93 600 15 1 & 3 118-304793-010 193-302120-015 112-045422-007 072-304551-008 315-304252-003
DRA-20-23 240 19.5 3 118-304793-004 193-302120-009 112-045422-007 072-304551-014 ———
DRA-20-43 480 20 1 & 3 118-304793-005 193-302120-012 112-045422-007 072-304551-008 315-304252-001
DRA-20-93 600 20 1 & 3 118-304793-006 193-302120-015 112-045422-007 072-304551-008 315-304252-003
DRA-30-43* 480 30 3 118-304793-011a 193-302120-012 112-045422-007 072-304551-008 315-304252-001
DRA-30-43* 480 30 3 118-304793-013b 193-302120-012 112-045422-007 072-304551-008 315-304252-001
DRA-30-93* 600 30 3 118-304793-012a 193-302120-015 112-045422-007 072-304551-008 315-304252-003
DRA-30-93* 600 30 3 118-304793-014b 193-302120-015 112-045422-007 072-304551-008 315-304252-003
30 kW units contain two sets of three elements (six total). The ratings of the three elements on the discharge end have a lower wattage than the elements on the fan
end of heater. The ends of the elements are color coded, the lower wattage are color coded yellow and the higher wattage are color coded blue.
a. Lower wattage elements, discharge end, yellow coded
b. Higher wattage elements, fan end, blue coded
Parts Common to all Units
Description Part No.
Wheels 333-557518-006
Grille 134-304780-002
Thermostat 300-304782-001
Thermal Cut-out 300-048038-003
Fan Relay (not used on 208 and 240V Models) 072-123534-057