AAON F1-060, Installation, Operation & Maintenance Manual, Page: 7 / 56

7
Do not clean DX refrigerant coils with
hot water or steam. The use of hot
water or steam on refrigerant coils
will cause high pressure inside the
coil tubing and damage to the coil.
Some chemical coil cleaning
compounds are caustic or toxic. Use
these substances only in accordance
with
the manufacturer
’s
usage
instructions. Failure to follow
instructions may result in equipment
damage, injury or death.
WARNING
To prevent damage to the unit, do not
use acidic chemical coil cleaners. Do
not
use alkaline chemical coil
cleaners with a pH value greater than
8.5, after mixing, without first using
an aluminum corrosion inhibitor in the
cleaning solution.
CAUTION
CAUTION
Do not use oxygen, acetylene or air
in place of refrigerant and dry
nitrogen for leak testing. A violent
explosion may result causing injury or
death.
WARNING
Always use a pressure regulator,
valves
and gauges to control
incoming pressures when pressure
testing a system. Excessive pressure
may cause line ruptures, equipment
damage or an explosion which may
result in injury or death.
WARNING
Do not work in a closed area where
refrigerant or nitrogen gases may be
leaking. A sufficient quantity of
vapors may be present and cause
injury or death
.
WARNING
Risk of injury from hot parts
–
Disconnect all power, close all
isolation valves and allow equipment
to cool before servicing equipment
with heating coils. Hot water will
circulated even after the power is off.
WARNING