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NELSON
™
HEAT TRACING SYSTEMS
INSTALLATION
TANK HEATING PANELS
INSTRUCTIONS
P.O. BOX 726 TULSA, OK 74101 TEL 918-627-5530 FAX 918-641-7336 www.nelsonheaters.com
GA-1591 Rev. 3
Sheet 1 of 4
September 2005
GENERAL
Nelson Heat Tracing System's VH Series Silicone Tank Heating Panels are constructed with high
temperature resistance elements, vulcanized between two thin layers of fiberglass reinforced silicone rubber.
The panel is protected by a rugged corrosion resistant, stainless steel ground shield. This unique construction
provides a rugged water and chemical resistance with flexibility down to -57°C (-70°F). This flexible panel is
attached to the tank using aluminum foil tape, proving a low cost, simple installation.
A. Receiving Inspection
1. Inspect each unit upon receipt
2. Visually inspect for physical damage
3. Megohm insulation test with 500V meager between power wires and ground
B. Panel Location
1. Locate units as low as practical on the tank. Preferably.
2. Locate power connection brackets to facilitate routing of flexible conduit between panels
3. Locate panels a minimum of 305mm (12") apart.
C. Preparation
1. Remove dirt, loose scale, and rust from tank surface where aluminum tape will be attached.
2. Install on smooth surface. DO NOT INSTALL OVER RIDGES, BUMPS, OR EDGES THAT COULD
RUB AGAINST THE PANEL AND CAUSE PRE-MATURE FAILURE.
D. Attachment
1. Hold panel in place, metal shield and bracket facing outward.
2. Apply aluminum foil tape (AT-50) to the edge of panel, extending it 203 - 356mm (8-14") beyond the
panel edges.
3. Stretch panel smoothly across tank wall and tape the opposite edge, again extending 203 - 356mm (8-
14") beyond the panel edges.
4. Repeat taping for other edges of the panel.
5. Tape added strips across the panel, around the circumference at approximately 203mm (8") spacing.
Extend the tape 203 - 356mm (8-14") beyond the edges of the panel.
6. Panel may be pre-formed to put a permanent set in the stainless shield on the panel. This will allow the
panel to be easily held in place on small diameter tanks.
7. If it becomes necessary to band the panel to the tank, use fiberglass tape (GT-6 or GT-60). Put two
wraps of tape around the tank circumference at 305mm (12") intervals.
8. After installation, meager panel again between the power wiring and the ground. Insulation resistance
should be at least 50 megohm with a 500V meager.
E. Electrical Connection
1. 13mm (0.5") conduit nipple, 76mm (3") long exist panel wiring through tank thermal insulation.
2. Electrical connection fittings are connected with flexible, watertight conduit. DO NOT CONNECT RIGID
CONDUIT DIRECTLY TO ANY OF THE HEATER PANEL'S ELECTRICAL CONNECTION FITTINGS.
NELSON
™
HEAT TRACING SYSTEMS
INSTALLATION
TANK HEATING PANELS
INSTRUCTIONS
P.O. BOX 726 TULSA, OK 74101 TEL 918-627-5530 FAX 918-641-7336 www.nelsonheaters.com
GA-1591 Rev. 3
Sheet 2 of 4
September 2005
F. Thermostat Bulb Location & Mounting
1. Locate the primary thermostats sensing bulb. As low as possible on the tank, as far away from heating
panel as practical. Secure to vessel wall with aluminum tape.
2. Install the hi-temperature cut-out sensing bulb directly on the heater panel secure bulb to heating panel
with aluminum foil tape. Hi-temp sensing bulb must be located on the highest mounted heating panel
on the vessel. Locate hi-temp sensing bulb 152mm (6”) from the highest edge and centered. See
Figure 1 below.
HI-TEMP
CUT-OUT
T-STAT
Heatin
g
Panel
Sensing Bulb
152mm (6")
C
L
Figure 1
G. Performance and Rating Data
Tank Heater Size (inches) Watts @100°F Voltage VAC Load Amps
VH1-500 12 x 22 500 120 4.17
VH1-1000 29 x 28 1000 120 8.33
VH2-500 12 x 22 500 240 2.08
VH2-1000 18 x 28 1000 240 4.17
VH2-2000 24 x 42 2000 240 8.33
Note: For 208V - multiply VH2 wattage by 0.75
H. Heater Specifications
Maximum operating temperature: 260°C (500°F)
Maximum temperature (UL recognition): 220°C (428°F)
Minimum ambient temperature: -57°C (-70°F)
Thickness: 15mm (.60”)
Lead Length: 305mm (12”)
Weight: 12 oz / 2 ft
NELSON
™
HEAT TRACING SYSTEMS
INSTALLATION
TANK HEATING PANELS
INSTRUCTIONS
P.O. BOX 726 TULSA, OK 74101 TEL 918-627-5530 FAX 918-641-7336 www.nelsonheaters.com
GA-1591 Rev. 3
Sheet 3 of 4
September 2005
Power Connection Bracket
203 - 357mm (8"-14") TYP
51mm (2") Aluminum Tape
(AT-50)
203mm (8") TYP
CAUTION
1. Check panels for proper voltages
2. Do not use on non-metallic tanks
3. Contact factory when designing for
temperature sensitive fluids.
4. Do not use with low temperature
insulation (rated below 188°C
(370°F) directly over heater panels.
Note: Low temperature insulation
may be used everywhere except
directly over the heater panels.
!
WARNING:
Heater panels must be used with
a hi-temp cut-out thermostat.
Figure 2
Mounting Detail
from power suppy
Drain at low point of conduit system
90° Condulet
Condulet
FLEX NOT TO EXCEDE NEC
RECOMMENDED LENGTH
Thermostat Bulb
(mount on tank wall)
CONTROL
CONDUIT MUST BE INSTALLED PER NEC
*Interconnecting Conduit
(as required)
*Nipple
*Wire Nuts
Gasket
Cover Plate Screws
Cover Plate
Tank Heating Panel Power
Connection Bracket
Tank Heating Panel
Tank Insulation
Flex Conduit
AND LOCAL CODES
Tank
to other panels
*Conduit Fitting
RIGID CONDUIT
T-STAT
HI-TEMP
CUT-OUT
T-STAT
13 x 76mm (.5 x 3")
Hi-Temp Thermostat Bulb
(mount on heater panel surface)
*ITEMS SUPPLIED BY CUSTOMER
Figure 3
Conduit Routing Detail
NELSON
™
HEAT TRACING SYSTEMS
INSTALLATION
TANK HEATING PANELS
INSTRUCTIONS
P.O. BOX 726 TULSA, OK 74101 TEL 918-627-5530 FAX 918-641-7336 www.nelsonheaters.com
GA-1591 Rev. 3
Sheet 4 of 4
September 2005
W
B
W
W
W
B
B
W
W
NC
NO
C
G
1
2
1st HEATER PANEL
IN CIRCUIT
2nd HEATER PANEL
IN CIRCUIT
LAST HEATER PANEL
IN CIRCUIT
L
L
G
1
2
1
L
2
L
G
G
2
L
1
L
1
L
2
L
G
NC
NO
High Limit Thermostat
Dual Pole Thermostat
(max. rating 277V, 30A)
Thermostat Bulb
(mount in tank wall using aluminum tape)
High Limit Thermostat
(set at 230°C (446°F)
305mm (12") Cold Lead
(attached to panel)
Optional "HC" Series** Contactor
*ITEMS SUPPLIED BY CUSTOMER
to line side of
control thermostat
to load side of high
limit thermostat
*Conduit Fitting
Single Pole Thermostat
(max. rating 480V, 22A)
L
L
**Contactor Cat. No.
120V HC-xxx
208 - 240V HC-xxx-240
Figure 4
Wiring Diagram
Notes:
1. Unless noted otherwise, all power supply cable, conduit and fittings to be supplied by customer.
2. Thermostats and contactors are available from Nelson Heat Tracing Systems, but must be ordered
separately.
Nelson Heat Tracing Systems products are supplied with a limited warranty. Complete Terms and Conditions may be found on Nelson's
website at
www.nelsonheaters.com.
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