JOHNSON CONTROLS
68
FORM 102.20-OM2
ISSUE DATE: 6/01/2015
SECTION 3 - MAINTENANCE
Cleaning Procedure
1. Cover any nearby components such as motors,
control devices or wiring.
2. Sweep, gather and remove debris from drain pan,
auxiliary pans and splash guards.
3. Scrape loose and remove any clinging substances.
4. Cover drain pan outlet with screening to prevent
drain clogging.
5. Prepare cleaning agent per manufacturer’s in-
structions.
6. Apply cleaning agent with spray applicator or
brush.
7. Apply cleaner to
ALL
surfaces including: un-
derside of coil, header and return bends if in air
stream, coil supports, coil wall or bulkhead, auxil-
iary drain pans, splash guards, any other surfaces
subject to wetting by condensation dripping or
carried by normal airflow, drain pan and outlet.
8. Add ample amount of cleaning agent to drain line
and trap.
9. Allow cleaner to stand for time required by manu-
facturer’s instructions.
10. Flush with clean water from pressure washer or
garden hose with spray nozzle.
11. Apply as much water under pressure as possible
to drain outlet to clean trap and drain line.
12. Remove water from any puddle areas with wet
vacuum.
13. Wipe down if necessary to remove any stubborn
material.
14. Restore equipment to operational state.
Coil Freeze Protection
All chilled water, hot water and steam coils can be
damaged during freezing weather. Take the following
re-cautionary measures to prevent freezing:
•
For year round operation, glycol and other anti-
freeze solution must be circulated.
•
During winter operation and shutdowns such as
power failure, night shutdown and weekend shut-
down, the controls must be installed so the valves
will go to the full heat position, and all fresh air
dampers go to the full closed position. The wa-
ter circulation pumps must keep circulating water
through the coils and/or auxiliary heat must be
maintained inside the AHU cabinet.
•
Draining each coil and related piping such as traps
and making sure that all low areas also drain.
• After draining, flush the coils with an antifreeze
solution such as propylene glycol. A solution
of 50% glycol and 50% water will protect from
freezing to approximately 35°F below zero at sea
level. Use adequate mixture for the geographic
area of the installation.
•
Winterizing Drain Traps
•
During the winter months when the cooling sys-
tem is turned off, and the unit is exposed to freez-
ing conditions, an anti-freeze solution, which is
environmentally friendly and safe for the roof can
be poured in the condensate drain trap to prevent
freezing and possible damage. The condensate
drain trap may also be removed as well as heat
traced and insulated.
ENERGY RECOVERY WHEEL
This AHU will be equipped with an energy recovery
wheel from one of the following vendors. Refer to the
correct instructions to maintain and clean this AHU.
•
Airxchange
®
•
NovelAire
®
Technologies
•
Thermowheel
®
•
Innergy tech
®
AIRXCHANGE
®
Tools and Materials
•
Brushes
•
Loctite
•
Screwdriver
•
Acti-Klean or alkaline detergent
Periodic cleaning of the energy recovery wheel will
be a function of the operating schedule, climate, and
contaminates in the indoor air being exhausted and out-
door air being supplied to the building.
