How do I install my electric Graco Reactor?

Prior to operation, you must properly install your electric Graco Reactor.

Regardless of which polyurethane foam or polyurea coatings you will be spraying, you must first install your electric Graco Reactor. This step-by-step guide contains the information you need to set up and safely operate your new machine.

Note: This step-by-step guide walks you through setting up your machine. This document is not replacing the manual, for a full overview of safety instructions please see the manual.


Assemble the Proportioner

Reactor 2 proportioners arrive in a shipping configuration. Before mounting the system, assemble the proportioner in the upright position.

  1. Remove bolts and nuts.
  2. Swing the electrical enclosure upright. 
  3. Reinstall bolt with nut. Tighten bolt and nut.
  4. Position the cable bundles against the frame. Attach the bundles to the frame with a loose wire tie on each side.

Mounting the System

WARNING:To prevent serious injury due to system tipping over, ensure Reactor is properly secured to wall.

NOTE: Reactor 2 proportioners arrive in a shipping configuration. Before mounting the system, assemble the proportioner in the upright position.

  1. Use the supplied bolts to install the supplied L-brackets onto the system frame in the top-most square holes. Install brackets on both the left and right side of system frame.
  2. Secure the L-brackets to the wall. If L-brackets do not line up with the wall stud spacing, bolt a piece of wood to the studs then secure L-brackets to wood.
  3. Use the four holes in the base of the system frame to secure base to the floor. Bolts not supplied.




WARNING: The equipment must be grounded to reduce the risk of static sparking and electric shock. Electric or static sparking can cause fumes to ignite or explode. Improper grounding can cause electric shock. Grounding provides an escape wire for the electric current.

  • Reactor: System is grounded through the power cord.
  • Spray gun: connect whip hose ground wire to FTS. See Install Fluid Temperature Sensor, page 29 in the manual. Do not disconnect ground wire or spray without whip hose.
  • Fluid supply containers: follow your local code.
  • Object being sprayed: follow your local code.
  • Solvent pails used when flushing: follow your local code. Use only metal pails, which are conductive, placed on a grounded surface. Do not place pail on a nonconductive surface, such as paper or cardboard, which interrupts grounding continuity.
  • To maintain grounding continuity when flushing or relieving pressure, hold a metal part of spray gun firmly to the side of a grounded metal pail, then trigger gun.

General Equipment Guidelines

NOTICE: Failure to properly size the equipment may result in damage. To avoid damage to the equipment, follow the guidelines listed below.

  • Determine the correct size generator. Using the correct size generator and proper air compressor will enable the proportioner to run at a nearly constant RPM. Failure to do so will cause voltage fluctuations that can damage electrical equipment. Ensure that the generator matches the voltage and phase of the proportioner. 

Use the following procedure to determine the correct size generator.

  1. List peak wattage requirements of all system components.
  2. Add the wattage required by the system components.
  3. Perform the following equation: Total watts x 1.25 = kVA (kilovolt-amperes)
  4. Select a generator size that is equal to or greater than the determined kVA.
  • Use the electrical rating in the models section (see Models, page 9 in the manual ) to determine the correct size power cord.

NOTICE: Undersized power cords can cause voltage fluctuations that can damage electrical equipment and may cause the power cable to overheat.

  • Use an air compressor with continuous run head unloading devices. Direct online air compressors that start and stop during a job will cause voltage fluctuations that can damage electrical equipment.
  • Maintain and inspect the generator, air compressor, and other equipment per the manufacturer recommendations to avoid an unexpected shutdown. Unexpected equipment shutdown will cause voltage fluctuations that can damage electrical equipment.
  • Use a wall power supply with enough current to meet system requirements. Failure to do so will cause voltage fluctuations that can damage electrical equipment.

Connect Power

WARNING: All electrical wiring must be done by a qualified electrician and comply with all local codes and regulations.

  1. Turn main power switch OFF. 
  2. Open electrical enclosure door.
  3. NOTE: Terminal jumpers are located inside the electrical enclosure door.
  4. Install supplied terminal jumpers in the positions shown in image for the power source used.
  5. Route power cable through strain relief in electrical enclosure.
  6. Connect incoming power wires as shown in image. Gently pull on all connections to verify they are properly secured.
  7. Verify all items are connected properly as shown in image then close electrical enclosure door.

Supply Wet Cups With Throat Seal Liquid (TSL)

WARNING: Pump rod and connecting rod move during operation. Moving parts can cause serious injury such as pinching or amputation. Keep hands and fingers away from wet-cup during operation.

To prevent the pump from moving, turn the main power switch OFF.

  • Component Component Component A (ISO) Pump: Keep reservoir filled with Graco Throat Seal Liquid (TSL), Part 206995. Wet-cup piston circulates TSL through wet-cup, to carry away isocyanate film on displacement rod.
  • Component B (Resin) Pump: Check felt washers in packing nut/wet-cup daily. Keep saturated with Graco Throat Seal Liquid (TSL), Part No. 206995, to prevent material from hardening on displacement rod. Replace felt washers when worn or contaminated with hardened material.

Install Fluid Temperature Sensor

The Fluid Temperature Sensor (FTS) is supplied. Install FTS between main hose and whip hose (see your heated hose manual).


Connect Heated Hose to Proportioner

NOTICE: To avoid damage to the hose, only connect Reactor 2 proportioners to genuine Graco heated hoses.

Refer to your heated hose manual for detailed connection instructions. 

  1. Turn off the main power switch. 
  2. For proportioners with termination box:
    1. Connect hose power wires to terminal block on termination box. Remove box cover and loosen lower strain relief. Route hose wires through the box strain relief and fully insert into terminal block. A and B hose wire positions are not important. Torque to 35–50 in-lb (4.0–5.6 N·m).
    2. Fully tighten strain relief screws and replace cover.
  3. For proportioners with electrical splice connectors:
    1. Connect hose power wires to electrical splice connectors from proportioner. Wrap connections with electrical tape.
  4. Connect FTS cable connectors. Fully tighten RTD connectors, if provided.

Refer to the manual for further directions:

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