Edelbrock 72700 User manual

Catalog #72700
Brochure No. 63-72700
©2008 Edelbrock Corporation
Rev. 5/08 - AJ/mc
Page 1 of 4
12-Volt 10-lb./15-lb. Nitrous Bottle Heater
Catalog # 72700
INSTALLATION INSTRUCTIONS
PLEASE study these instructions carefully before beginning this installation. If you have any questions, please contact our
Technical Hotline at: [phone] from 7 am - 5 pm, Monday through Friday, Pacific Standard Time or e-mail us at
[email protected].
FEATURES:
• Durable, Long-Lasting Heating Element
• Velcro® Straps for Easy Installation
• Dual Thermostat Cartridges for Reliability
• All Electrical Hardware Included
INSTALLATION INSTRUCTIONS
1. Secure the Edelbrock bottle heater around the bottle using the Velcro straps. Mount the heater around the bottom
section in a manner so that the end gap is at the top of the mounted bottle, making sure that the electrical
connections are free. Do not cover the bottle label.
Important Note: Please ensure that the bottle heater is installed snugly with no ripples. The bottle heater must
completely contact the bottle.
2. Place thermostat assembly under one of the velcro straps. Position it between the bottle surface and the strap,
ensuring the thermostat is in full contact with the bottle. This is your bottle temperature reference signal and it must
be installed correctly or damage may occur.
3. Mount the relay assembly in an area close to the bottle in a location that will be as moisture free as possible. Keep
the relay assembly away from high traffic areas. Hard or blunt impacts can damage the relay.
4. Route the red wire from the bottle heater to the blue wire on the relay.
5. Connect the black wire from the heater to a chassis ground. Remember to leave enough wire for bottle removal and
replacement before and after filling.
6. Connect one(1) wire from the thermostat to the black wire on the relay assembly.
7. Connect the other wire on the thermostat to a good chassis ground. Remember to leave enough wire for bottle
heater movement during bottle removal and replacement before and after filling.
8. Route the red wire on the relay harness, (that includes the inline fuse) directly to the positive side battery post or
starter solenoid post that the battery cable attaches to. This is done to ensure that the maximum current draw is
done through the relay and not the switch. Failure to attach this wire directly to either of these two locations can
result in possible electrical failure. Use appropriate connector to splice into power wire (minimum 12-gauge wire).
IMPORTANT NOTE:
Proper installation is the responsibility of the installer. Improper installation will void warranty and may
result in poor performance and engine or vehicle damage.

Catalog #72700
Brochure No. 63-72700
©2008 Edelbrock Corporation
Rev. 5/08 - AJ/mc
Page 2 of 4
9. Mount the bottle heater on-off toggle switch in the passenger compartment. Place it in a convenient and visible
location. Ensure that during the installation, the lighted portion of the switch is working and easily visible.
10. Connect terminal #1 from the toggle switch to an “ignition-switched” +12 volt source. We recommend that you
connect this wire to the switched-on power of the vehicle’s nitrous system arming switch. This ensures that the
heater can only be activated when the nitrous system is armed.
11. Connect terminal #2 from the toggle switch to the white wire on the relay.
12. Connect terminal #3 to a good chassis ground.
Wiring Diagram
Item # Qty. Description
1 1 Nitrous Relay Receptacle
2 1 Thermostat Assembly
3 1 Relay, SPDT, with Diode
4 1 Fuse, ATO, 25 Amp
5 2 Crimp-on Splice Connector
6 3 Crimp-on Disconnect Terminal, Female, Blue
7 2 Crimp-on Disconnect Terminal, Female, Red
8 2 Crimp-on Disconnect Terminal, Male, Blue
9 2 Crimp-on Disconnect Terminal, Male, Blue
10 2 Crimp-on Ring Terminal, Red
11 1 Crimp-on Ring Terminal, Blue
12 1 Switch, Toggle, Power, Lighted

Catalog #72700
Brochure No. 63-72700
©2008 Edelbrock Corporation
Rev. 5/08 - AJ/mc
Page 3 of 4
IMPORTANT WARNING
This Edelbrock heater should never be used without the thermostats installed. The thermostats must always be in
contact with the surface of the bottle in order for the thermostats to properly sense the bottle temperature. The
thermostats have a cut-in and cut-out setting at 85º F
+/- 5º F. Failure to follow this important warning will result in the temperature of the bottle to rise to unsafe
temperatures and the pressure within the bottle to rise to levels that could lead the bottle Pressure Relief Device to
rupture, causing the bottle contents to empty.
To Test Bottle Heater for Correct Operation:
1. Turn ignition key to the “run” position.
2. Turn the vehicle’s nitrous system toggle switch to the “on” position.
3. Turn the bottle heater toggle switch to the “on” position.
4. A “click” should be heard from the heater’s relay when first activated as long as the thermostats are below
85º F.
5. Heater should now start to warm up. It may take a few seconds for the heater to heat up to correct operating
temperature.
6. When bottle temperature reaches near 85-90º F, the thermostats will cut off the ground to the relay, de-
activating the heater. When temperature drops below 85º F, the relay will be grounded through the thermostats,
re-activating the heater.
Troubleshooting
•Heater Takes a Long Time to Heat Up.
1. Be sure thermostat touches bottle and is positioned between end gap of heater. Heater will not operate
correctly if thermostat comes in contact or is too close to the heater element itself.
2. Inspect all ground connections. Check for shorts.
•Bottle Heater Does Not Get Hot.
1. Ensure that there is power through the relay. Temporarily place black wire from relay to ground. This will
bypass the thermostat and will activate the relay to supply power to the heater. If this does not activate the
heater, check below items. Ensure all electrical connections are made as shown in diagram.
2. Check for bad inline fuse. Replace with a 25 amp. fuse.
3. Check toggle switch.
4. Check all wires for shorts.
5. Check all ground connections.
6. Check thermostat. When temperatures are below 85° F, there will be continuity on the thermostat wires.
When there is no continuity below 85° F, replace thermostat.

Catalog #72700
Brochure No. 63-72700
©2008 Edelbrock Corporation
Rev. 5/08 - AJ/mc
Page 4 of 4
Edelbrock Corporation, 2700 California St., Torrance, CA 90503
Tech Line: 1-800-416-8628
E-Mail: [email protected]
CAUTION:
1. The bottle heater surface can achieve temperatures in excess of 400 degrees. Do not attempt to handle, adjust,
or remove from the bottle while the heater is in operation.
2. Do not touch heater surface while in operation. Severe burns to the skin can result.
3. Do not rest or lie heating element against flammable or temperature sensitive materials, objects, paints, or
coatings as they could be caused to ignite due to the excessively high temperatures.
4. Do not operate this heater unless installed properly and securely attached to a nitrous cylinder as damage to the
heater could result.
5. Do not operate this heater when attached to a nitrous cylinder that has a closed cylinder valve as this could
cause high in-cylinder pressures and cause the pressure relief device to open and release the bottle’s contents.
6. Do not operate this heater for extended periods of time.
7. Do not expose heater to an open flame as this can cause the heating element to fail.
8. Do not rest the heating element against a vehicle’s structural member of any hard surface while attached to the
bottle as this could damage the internal element windings within the heater.
9. Do not attempt to remove the bottle from the bottle mounting in the vehicle without first removing the bottle
heater. Contact with the bottle mounting brackets could cause damage to the internal wiring within the heater.
Always refer to your Nitrous System Owner’s Manual or Instructions for safety precautions when performing any service
on your Nitrous System.
Edelbrock Corporation shall not be liable for any and all consequential damages occasioned by the breach of any written
or implied warranty pertaining to this sale in excess of the purchase price of the product sold.