Derale 16720 Installation Instructions

Please read these instructions completely before beginning installation
QTY. DESCRIPTION
1 1/8" NPT Thermostat Switch
1 Relay Wire Harness
1 3/8" x 1/8" Reducer Bushing
3 #10 Sheet Metal Screw
4 4" Wire Ties
1 Roll Extra Wire
THERMOSTAT PROBE INSTALLATION
Placement: Locate a port on the vehicle,
vehicles radiator, manifold or water outlet.
1/8" NPT port installation -
install the Thermostat Switch into the port on the vehicle.
3/8" NPT port installation -
install the 3/8" x 1/8" NPT Reducer Bushing into the 3/8" NPT port on
the vehicle. Using Teflon Tape or suitable sealant install the Thermostat
Switch into the 3/8" x 1/8" NPT Reducer Bushing.
(See Diagram #1)
RELAY WIRE HARNESS MOUNTING
1. Taking into consideration probe placement and wire routing
requirements, choose a convenient location.
Avoid mounting near HOT engine components.
2. Using the relay bracket as a template, mark and drill a 5/32" hole in
the proper location.
3. Using the #10 Sheet Metal Screws provided, install the relay/wire
harness.
WIRING
Before starting, disconnect the Negative (-) cable on the vehicles battery.
Using the electrical connectors and wire ties provided, follow the directions below.
WARNING: When extending wires always use the identical gauge wire as provided.
See Diagrams # 2 & 3 on page 2
Red: Using the Blue 5/16" Ring Terminal provided attach to the Positive (+) terminal of the battery.
Black: Using the Blue #10 Ring Terminal and #10 Sheet Metal Screw provided attach to a good chassis ground (-).
Yellow Wire - Using the Blue Female Connector provided, attach the Yellow Wire to EITHER terminal on the Thermostat
Switch.
Thermostat Switch - Using the Blue Female Connector, Blue Wire Tap Connector and Wire provided, attach the remaining
Thermostat Switch Lead to a Positive (+) switched ignition source.
Warning: Attaching this wire directly to a 12V non-switched source will allow the fan to run after the vehicle has been turned
off which could effect the vehicles battery performance.
Green (Optional): The green wire is designed to work in two different configurations. When used, this will allow the fan(s) to
be turned on regardless of the temperature of the thermostat as it simply overrides all other functions. If you choose to not use
this option disregard the wire.
1. A/C Override - Using the Blue Wire Tap provided, attach the green wire to the positive (+) lead on the air conditioning
compressor.
2. Manual Switch Override - Attach the Green Wire to the manual switch NOT PROVIDED. (See Diagram #4 on page 2)
Orange/Blue Wires: See page 2 for single or dual fan configurations.
(Continues on reverse side)
Derale Performance, Los Angeles, CA
SINGLE STAGE ELECTRIC FAN THERMOSTAT
KIT CONTENTS
QTY. DESCRIPTION
1 Blue 5/16" Ring Terminal
2 Blue #10 Ring Terminal
2 Blue Butt Connectors
2 Blue Female Connectors
2 Blue Wire Tap Connectors
generally
Using Teflon Tape or suitable sealant
Using Teflon Tape or suitable sealant
INSTALLATION INSTRUCTIONS
PART # 16720 & 16721
12V Test Light
Wire Stripper
Crimping Tool
5/8 Open End Wrench "
11/16" Open End Wrench
This single stage electric fan thermostat will control up
to two different fans with a
found on the
DRAW OF 25 CONTINUOUS AMPS.
25 amps combined we recommend using one switch
per fan.
Diagram #1
1/8" 1/8"
NPT NPT
800.421.6288
TOOLS NEEDED
Teflon Tape
Standard Screw Driver
or a 5/16" Nut Driver
Drill
5/32" Drill Bit
IMPORTANT
COMBINED MAXIMUM
1/8" 1/8"
NPT NPT
www.derale.com
If fans exceed
3/8" 3/8"
NPT NPT
16720-16721-InstructionSheet