Mammoth 800 to 5500 CFM: Dedicated Outdoor Air System with Enthalpy Wheels (VHC) - Manual (Page 15)

MAMM-VHC-IOM-1A (JANUARY 2013) 15
Quarterly maintenance (every three months) should include:
Air Filters
The standard medium efficiency filters and optional high ef-
ficiency filters are disposable and should be replaced every
three months. More frequent replacement may be required
under extremely dirty operating conditions.
To replace the filters, open the filter access door, grasp the
filters and pull straight out. The filters will slide completely
out of the unit. Slide the new filters into the frame and close
the filter access door.
Cassette Panels and Interior of Unit
Remove the filters from the unit. Wipe the foil faced insu-
lation, or the optional interior galvanized liner, surfaces
and cassette panels with a soft cloth and mild cleaning
solution.
Annual maintenance should include:
Aluminum Enthalpy Wheel
No cleaning of the enthalpy wheel is required as it is
self-cleaning due to the opposing airflows. If it is desired
to clean the enthalpy wheel, use low pressure air or a
vacuum. Wash the cassette panels with a soft cloth and
mild cleaning solution. Visually inspect the cassette brush
seals (shown in Figure 4), perimeter seal and drive belt
for proper operation.
Fans
Blower wheels and fan housing should be checked for dirt
buildup. If they are dirty, it will be necessary to remove the
blower assembly to clean the dust out through the fan mouth.
System Operation Check
Verification of all control modes should be checked to en-
sure proper operation. Refer to Start-up section.
Dirt on the surface of the coil reduces its ability to transfer
heat which lowers the efficiency of the unit, resulting in
poor air quality and expensive operating costs. Because
of the condensate on the coil, the dirt often becomes wet
and contributes to the growth of microbial organisms.
Negligence in maintenance may result in serious health
related indoor air quality problems.
The coil should be kept clean for maximum performance.
To achieve maximum efficiency, clean the coil often during
periods of high demand or when dirty conditions prevail.
Mammoth recommends cleaning the coil a minimum of
once per year to prevent dirt buildup in the coil fins where
it may not be visible.
Coil fins can be cleaned by using steam with detergent, hot
water spray or a commercial chemical coil cleaner. After
cleaning the coil, be sure to rinse thoroughly.
Cleaning Procedure
1. Shut down the unit by closing the main disconnect
at the power inlet.
2. Open panels or doors to gain access to both sides of
the coil section.
3. Remove soft debris from both sides of the coil with a
soft brush.
Quarterly Maintenance
Annual Maintenance
Coils
Rotor
Brush seal
Figure 4: System operation check
Service
CAUTION
Do not use acidic chemical coil cleaners. Do not use al-
kaline chemical coil cleaners with a pH value greater than
8.5 or lower than 6 (after mixing) without using an alu-
minum corrosion inhibitor in the cleaning solution. Using
these types of cleaners may result in unit damage.