KAH Operation & Maintenance Guide
Page: 49 of 88
Krueger | 1401 N Plano Rd | Richardson, TX 75081 | 972.680.9136 | [email protected] | www.krueger-hvac.com
SECTION 3 - MAINTENANCE (CONTINUED)
ECONOMIZER SEGMENT (DAMPERS)
Cleaning Procedure
Cleaning of dampers should be performed
before operation is hindered in any way.
Maintenance personnel must determine
when cleaning is necessary based on
observation and operation.
Hardware Check
Make sure all linkage parts, actuators and,
mounting brackets are secure.
COIL SEGMENT CLEANING
Tools, Equipment and Materials
•
Pressure washer that does not exceed
2000 psi. Sprayer (utility garden, etc.)
applicator
•
Plastic sheeting and duct tape
•
Screening
•
Coil cleaner (safe, commercial, disinfecting)
•
Garden hose and spray nozzle
•
Pail and rags
•
Trash bags
•
Power cords
•
4” paint brush
Cleaning Procedure
1. Clean dehumidification coils annually or when air pressure drop
exceeds 125% of design.
2. Cover electrical components such as fan motors, damper motors,
compressors, thermostats, etc. with plastic. Care should be taken
on interior coil cleaning. Remove filters; cover fan bearings and any
insulation to keep these items free of water damage. Condensate
drain piping should be screened to allow coil-cleaning water to
flow freely. Screening keeps traps and drain lines from clogging
with debris washed from the coils.
3. Prior to any application of wet cleaning materials, use a wide soft
bristle paint brush to dust off any heavy dust, leaves, bugs or other
foreign matter that may be on the coil fin surface.
4. Safety glasses should be worn when cleaning coils.
5. When possible, remove dirt lodged in the depth of the coil by
using clean oil-free air under pressure. Caution should be taken
not to use extreme high-pressure air as this may cause fin surface
damage. Direct the air straight at the openings between the fins
and never at an angle, which may bend the fins against one
another. Always apply the air from the air leaving side of the coil.
6. On heavily soiled coils, use a safe commercial grade coil cleaner.
7. Follow the safety and mixing instructions as noted on or with the
cleaning agent.
8. Spray the cleaning agent on both sides of the coil to be cleaned.
Allow the cleaning agent to remain in contact with the dirty surface
for about 5 minutes or as recommended by the agent instructions.
Then flush the coil with clean water from a hose (with spray
nozzle or from pressure washer). Flush from the air leaving side
of the coil. Caution should be taken, as extreme water pressure
may result in fin surface damage. Direct the water straight at the
openings between the fins and never at an angle, which may bend
the fins against one another. This process will wash away surface
dirt on the air entering side of the coil, and prevent it from loading
within the depth of the coil.
9. Most cleaners are concentrated detergents and can be diluted
with up to 10 parts water. Dilute as per cleaning agent instructions
and coil condition. Re-spray both sides of the coil with cleaner.
Allow to stand five minutes and flush as described previously.
Finish flushing from both sides of the coil.
10. Follow the cleaning agent instructions. Agent should meet
environmental and OSHA standards.
11. Some extreme oil and dirt conditions may require steam cleaning.
Most steam equipment can be adjusted to provide a mixture of
water and steam at a moderate pressure. Steam alone without the
presence of water does not work well with most cleaning agents.
Cleaning the coils with steam should be done as described
previously.
12. Comb out any bent or flattened areas of the fin surface.
13. Restore the equipment to its operational state.
NOTE -
Prior to occupancy , test
ventilation system to ensure that
outdoor air dampers operate properly
in accordance with the system design.
CAUTION -
Do not use lubricants.
Krueger suggests cleaning with
contact cleaner or 50/50 H
²
O/
alcohol solution. Consult proper
building personnel to ensure above
solution will not harm personnel or
equipment.