®
Chromalox
Installation, Operation
DIVISION
SALES
SECTION
4
SDRA
and
(Supersedes PF499-1)
REFERENCE
PF499-2
RENEWAL PARTS IDENTIFICATION
161-304812-003
DATE
AUGUST, 2010
Portable Industrial Unit
Blower Air Heater
Types SDRA and SDRA-RG
Specifications – Table 1
Model
Electrical Data (60 Hz)
Phase
Dimensions (In)
Volts
kW
Amps
BTU
Height
Width
Depth
SDRA-30-43
SDRA-30-93
SDRA-48-43
SDRA-48-93
SDRA-60-43
SDRA-60-93
480
600
480
600
480
600
30
30
48
48
60
60
3
3
3
3
3
3
37.2
30.0
58.9
47.3
73.3
58.9
102,360
102,360
163,776
163,776
204,720
204,720
38.5
38.5
38.5
38.5
38.5
38.5
26
26
30-1/4
30-1/4
30-1/4
30-1/4
44
44
44
44
44
44
GENERAL
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 130˚F. Fan motor is not
designed to operate in ambients below -10˚F.
IMPORTANT:
SAVE THESE INSTRUCTIONS
To avoid personal injury read “IMPORTANT INSTRUC-
TIONS” on page 2 before installation or operation of
heater.
RISK OF FIRE. Do not use as a residential or house-
hold heater
Hazard of Fire or Discoloration of Temperature
Sensitive Fabrics. Do not use as a residential or
household heater. Keep combustible material and
Keep electrical cords and combustible materials, such
as drapes and other furnishings, away from heater.
© 2010 Chromalox, Inc.
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WIRING (cont’d.)
SDRA heaters can be easily field if modified to vary the fan speed.
Temperature Rise vs Duct Length
30 kW
There may be some circumstances where the use of short lengths of
duct may not create sufficient pressure drop to achieve the desired tem-
perature rise. This may also be the case of using the unit without a duct.
This insufficient static pressure drop may result in high air flow, with
the maximum temperature rise below the desired level, (even after the
fan speed has been reduced to the minimum rpm). An accessory AD-
16, adjustable damper, is available and can be attached to the heater to
produce a static load, ranging from .1” to .19” H2O which will act to
reduce the amount of air flow.
100
75
50
25
0
1500
RPM
1800
RPM
2200
RPM
175
0
50
25
125
150
75
100
The “Friction Loss” Graph 4 provides the actual test data on the
friction loss for the AD-16 damper attachment. The losses are stated as
the equivalent length in feet of 20” duct.
Duct Length in Feet
Temperature Rise vs Duct Length
48 kW
Friction Loss AD-16 Damper
90
160
140
120
1500
RPM
80
70
60
50
40
30
20
10
0
Damper Full Closed
1800
RPM
100
80
2200
RPM
60
40
Damper Full Open
20
0
75
Duct Length in Feet
100
0
25
50
125
150
175
2000
1400
1600
1800
Fan RPM
2200
2400
Temperature Rise vs Duct Length
60 kW
200
180
160
140
120
100
80
The SDRA Dragon includes 2 thermostats. The thermostat on the
air inlet end of the unit is for the minimum air temperature desired. The
thermostat on the discharge end of the heater is for the maximum air
temperature desired. The two thermostats are wired in series with the
heating element contactor coil. The temperature range of both ther-
mostats is 60 - 180˚F.
1500
RPM
1800
RPM
2200
RPM
60
40
20
0
25
50
175
0
75
100
125
150
Duct Length in Feet
ACCESSORIES
Front of
Heater
Rear of
Heater
Duct
Adapter
Adjustable
Damper
1/4-20 Wing nut
Provided with
AD-16
Adjustable Damper and Duct Adaptor
3
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FAN SPEED ADJUSTMENTS
Changing the Pitch Diameter of the Sheaves:
7. Loosen the set screw on the fan pulley or motor pulley. Fig. 3
shows the construction of the fan pulley, the motor pulley is the
same construction.
1. Tools required: 5/32” allen wrench, 3/8” nut driver, 9/16” box
wrench and a medium size phillips screwdriver.
2. Remove the lower belt cover by removing the (5) sheet metal
screws.
Figure 3
3. Remove the rear grille by removing the (4) 1/4” bolts and nuts.
4. Remove the belt cover inside the blower by removing the (4) sheet
metal screws.
5. Loosen the (4) bolts, (2) on each side. See Fig. 1.
Figure 1
3/8” Bolts
Fan belt tension
adjusting bolts
8. Rotate the front half of the pulley clockwise until it bottoms, then
rotate counter clockwise until the set screw aligns with the flat in
the threaded half of the pulley. The pulley is now in position for
adjustment. See Table 1 for the number of turns out. Tip: Leave
allen wrench in set screw and use free hand to fold fan blade.
Table 1
6. Loosen the (2) motor tension lock nuts and the fan belt tension
adjusting bolts. See Fig.2
No. of turns from full closed
No. of turns from full closed
Motor Pulley Fan Pulley
Fan
RPM
Fan
3/8” Bolts
Motor Pulley
Fan Pulley
1-1/2
RPM
1500
1600
1650
1725
1800
1850
3
2-1/2
2
1950
2000
2100
2200
2300
1-1/2
1-1/2
1-1/2
1-1/2
1
3
Figure 2
Lock Nuts
1-1/2
3-1/2
4
1-1/2
1-1/2
1
1-1/2
4-1/2
4-1/2
1-1/2
1/2
1-1/2
9. Retighten set screw, use of thread locking compound is recom-
mended.
Fan belt tension
adjusting bolts
10. Adjust fan belt tension, see Fig. 2. A 1/2” of belt deflection is rec-
ommended. Tighten lock nuts.
11. Tighten the 3/8” bolts, see Fig. 1
12. Rotate fan blade to make sure the fan belt does not rub.
13. Reinstall top belt cover, grille and lower belt cover. Tip: Installing
the grille before installing the lower cover makes it easier to access
the two lower grille bolts.
4
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WIRING DIAGRAMS
P4
P6
P5
T1
Inlet
Thermostat
Outlet
Thermostat
Cutout
T2
Motor
T3
T9
T7
T6
T4
T5
T8
12
Toggle Switch
Motor Relay
4
Front of
Heater
1
Attach all Wires on this
Side of Contactor to
Auxillary Terminals
10
Contactor
Heater Terminal Box
L1
L2
L3
Blk
Run these Wires
Through 1" Conduit
Blk/Red
or Grey
Wht
Blk
Transformer
Control Enclosure
SDRA 30kW, 480V, 3PH
P4
P5
P6
T1
T3
T9
T7
T2
Motor
T6
T4
T5
Run these Wires
Through 1/2"
Conduit
T8
Amber Pilot Light
Green Pilot Light
Cutout
Inlet Thermostat
Outlet Thermostat
Toggle
Switch
Motor
Relay
14
Wht
18
10
Blk
Transformer
Contactor
Front
of
17
30 Amp Fusing
13
Heater
1
L1
L2
L3
15
45 Amp
Fusing
1
12
4
Contactor
Run these Wires
through 1/4" Conduit
Heater Terminal Box
Control Enclosure
One end attached
to screw in terminal box
and other end attached to
screw on sub panel.
SDRA 48kW, 480V, 3PH
P4
P5
P6
T1
T3
T6
T4
T7
T5
T2
Motor
T9
Run these Wires
T8
Through 1/2"
Conduit
Amber Pilot Light
Green Pilot Light
Cutout
Inlet Thermostat Outlet Thermostat
Toggle
Switch
Motor
Relay
20
24
4
1
Wht
Transformer
12
Blk
15
1
1
23
Front
of
50 Amp Fusing
Contactor
2
Heater
13
14
17
L1
L2
L3
18
10
22
50 Amp Fusing
Contactor
Run these Wires
through 1/4" Conduit
Heater Terminal Box
Control Enclosure
One end attached
to screw in terminal box
and other end attached to
screw on sub panel.
SDRA 60kW, 480V, 3PH
5
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PARTS LOCATION
19
11
12
12
19
12
Front of
Heater
12
12
12
11
11
11
View Showing Element Placement
and Routing of Thermostat Capillary
and Mounting of Bulb
12
11
12
11
12
Element Assembly 30kW
Element Assembly 48kW
(20-1/2)
19
11
11
11
12
37
38
Front of
Heater
12
12
Twist Wire
11
11
11
12
12
View Showing Element Placement
and Routing of Thermostat Capillary
and Mounting of Bulb
12
(30-1/4)
Element Assembly 60kW
Front View with Grille Removed (All Sizes)
(44)
21
18
32
21
23
Fan Pulley
77
(38-1/2)
20
Back of
Heater
80 81
79
78
Motor Pulley
45
Side View Detail Showing Pulley
and Belt Installation
36
84
16
Side View shown with Heater and Control Terminal Box Covers Removed
All Sizes
6
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MAINTENANCE
Replace or repair damaged cords or plugs immediately. Check tight-
ness of all electrical connections prior to energizing Dragon. Blow out
or vacuum away any dirt or debris that may have accumulated around
the control enclosure fan motor or heating elements.
ELECTRIC SHOCK HAZARD. Disconnect heater from
power supply before servicing and/or inspecting the
heater; failure to do so may result in electrical shock.
RENEWAL PARTS IDENTIFICATION
Element (11)
Part No.
Element (12)
Part No.
Motor (16)
Part No.
Contactor (20)
Part No.
Transformer (21)
Part No.
Fuse Block (80)
Part No.
Fuse (81)
Part No.
Term. Block (84)
Part No.
Model No.
Volts kW Phase
SDRA-30-43 480 30
SDRA-30-93 600 30
SDRA-48-43 480 48
SDRA-48-93 600 48
SDRA-60-43 480 60
SDRA-60-93 600 60
3
3
3
3
3
3
118-304793-011(3) 118-304793-013(3) 193-121843-232 072-304551-008
118-304793-012(3) 118-304793-014(3) 193-121843-233 072-304551-008
315-304252-001
315-304252-003
N/A
N/A
N/A
N/A
N/A*
N/A*
118-304793-011(3) 118-304793-013(6) 193-121843-232 072-304551-008(2) 315-304252-001 129-025643-001
118-304793-012(3) 118-304793-014(6) 193-121843-233 072-304551-008(2) 315-304252-003 129-025643-001
128-026510-005(3) 303-047468-004
128-026510-005(3) 303-047468-004
118-304793-011(6) 118-304793-013(6) 193-121843-232 072-304551-008(2) 315-304252-001 129-025643-001(2) 128-026510-006(6) 303-047468-004
118-304793-012(6) 118-304793-014(6) 193-121843-233 072-304551-008(2) 315-304252-003 129-025643-001(2) 128-026510-006(6) 303-047468-004
* Wired directly to contactor.
All units contain two sets of elements. The ratings of the elements on the discharge end have a lower wattage than the elements on the inlet 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
Item
18
19
23
32
33
36
37
38
45
77
78
79
86
87
94
95
Description
Part No.
Temperature Control
Hi-Limit Cut-out
Toggle Switch
300-019560-002
300-049200-004
292-046123-001
021-304823-009
134-304780-002(2)
375-122535-007
139-304779-003
139-304779-004
333-557518-004(2)
225-305091-004
225-305091-003
017-049702-009
213-122066-043
213-122066-042
169-300468-003
220-019122-010
Blower Assembly
Inlet & Outlet Grille
Caster / Locking
Handle - Right Side
Handle - Left Side
Semipneumatic Wheel
Pulley Var. Pitch 7/8”
Pulley Var. Pitch 5/8”
Pulley Belt
Pilot Light - Green
Pilot Light - Amber
Thermostat Knob
Thermostat Label
7
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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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