Never use a torch or open
cause injury to personnel
flame to thaw
and damage to
unit as it can ignite and
If unable to heat antifreeze, allow unit to thaw naturally in a shel-
tered area where the temperature is above freezing.
After thawing unit, observe water pressure gage for high readings indi-
cating contamination of branch hose strainer element by residual ice
Thawing Hoses and Accessories. Hoses and accessories should be
flushed with warm antifreeze until clean. Be sure branch hose strainer ele-
ment is thoroughly rinsed and clear of ice particles.
Operation in High Scale DepositEnvironments. If at any time you
detect any particles in, or a slight coating of scales on branch hose strainer
element, you are in a high scale deposit environment. If operations are to be
continually conducted at this site, you must des.tale or remove/replace accord-
ing to procedures on page 4-38.
In certain environments, you will notice an increase in high scale
deposit build-up on the heater coil.
More frequent inspection of
the heat exchanger must be done to keep equipment in good operating
The heat exchanger must be inspected at a minimum of
100-operating-hour intervals for scale build-up.
The descalimg procedures should be completed first, next (B) PMCS,
followed by a test to be sure equipment is operating properly after
Operation in Salt and High Humidity Areas.
Much aluminum is used in the equipment. Aluminum is subject to
corrosion in areas of high salt air.
To minimize damage to alumi-
num, wash and dry units well after exposure to salt air.
Keep the unit clean by moving it inside a protective shed or
building when salt or salt air is present. A coat of lubricant can
be used to preserve exposed surfaces on the unit.