North Star M1574210J Owner's Manual page 26

Choose a well-ventilated area and use the recommended
PPE (personal protective equipment) of the coil cleaning
chemical manufacture when descaling the coil and/or using
coil cleaning chemicals. This may include, but is not limited
to:
•
Rubber Gloves
•
Goggles
•
Apron
Required supplies:
1. Coil cleaner
2. 5-gallon bucket
3. Circulating pump
4. Supply hose A
5. Supply hose B
6. Return hose
7. Hose barb fittings, if applicable
8. Hose clamps, if applicable
SCALE BUILD-UP/EXPLOSION HAZARD
• Failure to properly maintain the coil can result in a
stream explosion.
• Scale or lime build-up will act as an insulator and
decrease coil efficiency.
• Weakling of the coil tube due to hot spots can result
in a coil rupture.
CHEMICAL EXPOSURE HAZARD
• Always wear properly rated safety goggles when
descaling the coil.
• Always wear rubber gloves when handling coil
cleaning chemical.
• Understand all safety hazards and first aid
measures for coil cleaning chemical being used.
• Follow coil cleaning chemical manufactures'
directions when handling, mixing and using coil
cleaning chemical.
Read owner's manual. See maintenance section
of manual for descaling procedure.
Read the coil cleaning chemical safety information.
Serious injury or death can result if safety instructions
are not followed.
To descale the coil:
1. Connect hose(s) as shown below to the coil inlet,
coil outlet and the circulating pump. Do not hook up
the pressure washer hose or gun.
OUTLET COIL
QUICK CONECT
Fig.1574210_12
NIPPLE FITTING
Maintenance & Repair
WARNING
INLET COIL
SWIVEL FITTING
2. Add commercial coil cleaner to water and mix. Use
an acid resistant 5-gallon bucket.
3. Place the remaining end of the Return Hose into the
5-gallon bucket.
4. Place the remaining end of the Supply Hose B into
the 5-gallon bucket. We recommend using an inlet
filter screen on Supply Hose B.
5. Connect the power supply to the circulating pump.
6. Turn on the circulating pump to begin circulating the
coil cleaning solution.
7. Run the circulating pump for 1 to 3 hours (follow coil
cleaner manufacturing instructions), recirculating the
coil cleaning solution. CAUTION: Do not run the
pressure washer or the burner.
8. Dispose of the cleaning solution where it is not
harmful to animals or the environment. Follow the
coil cleaner manufacturers disposal instructions.
9. Fill the 5-gallon bucket with fresh water.
10. Place the end of Return Hose back into the 5-gallon
bucket with fresh water.
11. Place the end of Supply Hose B back into the 5-
gallon bucket with fresh water.
12. Turn on the circulating pump to begin circulating the
fresh water.
13. Run the circulating pump for 5 minutes, recirculating
the fresh water.
14. Repeat steps 11-15 at least 3 times to ensure all
remaining coil cleaning residue has been flushed
out with fresh water.
15. Reinstall the outlet coil quick connect nipple fitting to
the coil outlet.
16. Reinstall the inlet coil swivel fitting to the coil inlet.
17. Attach the high-pressure hose(s) to the high-
pressure outlet on the machine.
18. Flush with fresh water and clean the garden hose
water inlet screen when finished.
Fig.1574210_13J
26