Daikin DFC Series, Installation Instructions Manual

Page: 15 / 52

15
Filters
CAUTION
TO PREVENT PROPERTY DAMAGE DUE TO FIRE AND LOSS OF
EQUIPMENT EFFICIENCY OR EQUIPMENT DAMAGE DUE TO
DUST AND LINT BUILD UP ON INTERNAL PARTS, NEVER
OPERATE UNIT WITHOUT AN AIR FILTER INSTALLED IN THE
RETURN AIR SYSTEM
Every application may require a different frequency of replacement
of dirty filters. Filters must be replaced at least every three (3)
months during operating seasons.
Dirty filters are the most common cause of inadequate heating
or cooling performance. Filter inspection should be made at least
every two months; more often if necessary because of local con -
ditions and usage.
Dirty throwaway filters should be discarded and replaced with a
new, clean filter.
Disposable return air filters are supplied with this unit. See the unit
Specification Sheet or Technical Manual for the correct size and
part number. To remove the filters, remove the filter access panel
on return side of the unit.
Cabinet Finish Maintenance
Use a fine grade automotive wax on the cabinet finish to maintain
the finish’s original high luster. This is especially important in in -
stallations with extended periods of direct sunlight.
Clean Outside Coil (Qualified Servicer Only)
The coil with the outside air flowing over it should be inspected
annually and cleaned as frequently as necessary to keep the
finned areas free of lint, hair and debris.
NOTE:
Clean the
opposite direction of air flow.
Maintenance of MicroChannel Heat Exchangers
(MCHE)
Frequent servicing is essential to maintaining the required MCHE
performance. For every installed Danfoss MCHE, service records
must be documented.
CAUTION
Prior to servicing MCHE, be sure to disconnect the power
supply and use lock-out methods to prevent the power from
accidentally being turned on.
Shut Down Periods
During periods when the MCHE is not operated for longer than
a week, the MCHE must be completely cleaned following the
cleaning procedure. This practice must also be performed during
short shut-down periods where corrosive deposits accumulate
on the MCHE.
Cleaning Procedure
Relative to tube & fin heat exchangers, MicroChannel heat
exchanger coils tend to accumulate more dirt on the surface of
the coil and less dirt inside the coil, making them easier to clean.
Follow the steps below for proper cleaning:
STEP 1: Remove Surface Debris
Remove surface dirt, leaves, fibers, etc. with a vacuum cleaner
(preferably with a brush or other soft attachment rather
than a metal tube), compressed air blown from the inside
out, and/or a soft bristle (not wire!) brush. Do not impact
or scrape the coil with the vacuum tube, air nozzle, etc.
STEP 2: Rinse
Rinse the coil by following procedure:
1. Rinse the coil by approved MCHE cleaner first, or rinsing
by water directly;
2. Waiting for 5 minutes;
3. Wash the coil by water;
Adjust the angle of gimbaled nozzle and insert it through
fans. Using an extension rod if the nozzle cannot reach the
bottom side. Preferably cleaning the coils from the inside-
out and top to bottom (see figure 1), running the water
through every fin passage until it comes out clean. The
fins of MicroChannel coils are stronger than traditional
tube & fin coil fins but still need to be handled with care.
Do not hit the coil with the hose. We recommend placing
your thumb over the end of the hose to obtain a gentler
spray and reduce the possibility of impact damage. Please
PAY MORE ATTENTION when using a pressure cleaning
equipment to prevent damage.
Figure 1
Highest pressure of cleaning equipment shall not exceed 15 bar,
and tentatively move the cleaning equipment from far to near to
prevent damage.
• KEEP the outlet of washer away from coil for at least 4in
(see figure 2);
• KEEP the water gun perpendicular to the coil surface and
the angle error shall less than 20°, or ±40° if the distance
from washer to coil is more than 12in (see figure 2);
• Water outlet angle for high pressure cleaning equipment
shall over 15° (see figure 3).