Graco 3A0592B, Instructions Manual

15

OPERATING INSTRUCTIONS

Cleaning with Detergents

Refer to “Detergent Cleaning Precautions” pg. 4 before 
working with detergents.  Be certain to wear protective 
safety attire.

Prepare detergent solution according to label directions.  
Never pump acids, alkaline, abrasive fluids or solvents 
through the unit. 

NOTICE

This feature is designed for use with mild detergents 
only. Since the cleaning solution travels through 
the heat exchanger coil, Do Not use corrosives as 
they will cause extensive damage as well as pose a 
considerable safety hazard.

•  Some units are equipped with adjustable detergent 

knobs. Locate the clear vinyl hose which leads to the 
pump head.

•  If your injector is equipped with an adjustment knob 

on the pump head, you may adjust the amount of 
detergent desired by turning the knob completely 
counterclockwise to set at the maximum siphon rate.

•  If your injector is not equipped with an adjustment 

knob, the detergent ratio is preset and cannot be 
adjusted.

1.  Fully immerse the detergent strainer end of the clear 

vinyl hose  into the detergent solution to allow detergent 
to siphon.  

2.  Adjust the grip on the dual lance assembly. Turn the 

knob completely clockwise for low pressure detergent 
operation.

Note: This injection system is designed to apply 

detergents under low pressure only.  It will not allow 

detergent solutions to be introduced into the  system 

unless the dual lance assembly is set in the low pres-

sure detergent mode.

3.  To apply solution;  unlock the trigger gun and squeeze 

the trigger.  In a few moments a detergent/water mixture 
will exit the nozzle.  Start spraying the lower portion 
of the surface being cleaned and move up, using long 
overlapping  strokes.    Applying  from  the  bottom  up 
helps avoid streaking.  Allow to soak briefly.  Do not 
allow detergent solution to dry on the surface.  (Avoid 
working on hot surfaces or in direct sunlight to minimize 
the chances of the detergent drying, which may result 
in damaging painted surfaces.)  Be certain to rinse a 
small section at a time.

4.  To rinse; lock the trigger gun in the “OFF” position, rotate 

the adjustable grip on the dual lance counterclockwise 
for high pressure.  Unlock the trigger gun and spray.  It 
will take about 30 seconds to purge all detergent from 
the line.  For best rinsing results, start at the top and 
work down.

5.  Siphon  a  gallon  of  water  through  the  low  pressure 

detergent  injection  system  after  each  use.    This 
prevents  the  possibility  of    corrosion  or  detergent 
residue causing mechanical problems during the next 
use.

Shutdown

1.  Move the burner switch to the “OFF” position.

2.  Squeeze  the  trigger  and  discharge  the  water  for  a 

period of three minutes to cool the heat exchanger and 
high pressure hose. (Insufficient cool down period of 
the high pressure hose will cause excessive wear and 
eventually rupturing of the hose.)

3.  Do Not close the choke to stop the engine. Backfire or 

engine damage may occur.

4.  Move  the  engine  On/Off  Switch  to  the  “OFF” 

position.

5.  Close the engine fuel shut-off valve.
6.  Turn  off  the  water  supply  and  pointing  the  gun  in  a 

safe direction, trigger the gun momentarily to relieve 
trapped pressure.

7.  Disconnect,  drain,  and  store  hoses.  Store  unit  in  a 

non-freezing environment.