Operation And Maintenance; Operation; General; Maintenance - McQuay HI-F5 Installation And Maintenance Manual

Operation and Maintenance

Operation

Operation and Maintenance

General

Proper air distribution is vital to coil performance. Airflow
1
anywhere on the coil face should not vary by more than
20%.
Air velocities should be maintained within McQuay's
2
recommended values of between 200 and 1500 fpm.
Operating pressures must be at or below the maximum
3
operating pressure for that coil at the steam temperature.
Operating pressure maximum is 150 psig @ 300 F for low
pressure steam coils and 350 psig @ 450 F for high
pressure steam coils.

Maintenance

Follow the manufacturer's guidelines for lockout/tagout and
disconnect all power to the unit before performing maintenance.
Contact with high voltage power will cause electrical shock,
resulting in severe personal injury or death.
Moving parts, high pressure, and/or high temperature fluids can
cause serious personal injury.
General
Filters should be inspected on a regular basis and changed
1
as needed. Clean filters help maintain maximum coil
performance and service life.
Periodic inspection of the coil for signs of corrosion and/or
2
leaks is recommended. Repair and replacement of the coil
and the connecting piping, valves, etc., should be
performed as needed by a qualified individual.
Should the coil surface need cleaning, caution should be
3
exercised in selecting the cleaning solution as well as the
cleaning equipment. Improper selection can result in
damage to the coil and/or health hazards.
Suggested cleaning instructions:
4
When handling strong chemicals, be sure to wear
a
chemical impervious gloves, apron and splash goggles.
8
DANGER
WARNING
Acti-Brite (AB-1) is the recommended cleaning
b
solution. Contact your local McQuay Parts Distributor.
Carefully read and follow the manufacturer's recommendations
before using any cleaning fluid.
Determine required dilution for the specific application.
c
It is recommended to start with a dilution ratio of 10:1
and increase concentration until the desired results are
achieved.
As with mixing all acids, place the desired amount of
d
water into the tank and then add the chemicals.
Turn off fans and allow hot coils to cool before
e
applying.
Using plain water, wet both the coil as well as the area
f
surrounding the equipment. Wetting the coil with water
aids in product penetration and performance.
Apply properly diluted product to coil surface.
g
whenever possible, apply solution from the outlet side
of the coil. Allow solution to remain on surface,
normally 5-10 minutes. Do not allow solution to dry on
the coil.
Note; In extreme cases, application may have to be
Note:
repeated to achieve desired results.
If foaming does not occur, check for extreme grease
h
buildup which will slow cleaning process. Foaming may
not occur if coil is coated or painted.
Rinse coils, tools and surrounding area thoroughly after
i
the coil cleaning.
Clean the coil from the leaving airside so that foreign
j
material will be washed out of the coil rather than
pushed further in.
Internal coil maintenance consists of preventing scale and
5
corrosion. This is accomplished through aggressive boiler
water treatment, removal of dissolved oxygen and the
removal of non-condensable gasses such as carbon dioxide.
Boiler water treatment is beyond the scope of this
Note:
manual. Contact your local water treatment
specialist for assistance in establishing a proper
boiler-water treatment program.
CAUTION
McQuay IM 901