39
Coil Type Identification
38AU units are available with different coil types. Cleaning
methods differ for each type so identifying the coil type is
important. Unit model number and appearance can identify
the coil type.
NOVATIONt Type —
The new NOVATION Heat Exchanger Technology is an
all--aluminum construction with louvered serpentine fins
over single--depth crosstubes. The horizontal crosstubes have
lar g e diameter aluminum headers on each end. Variou s
optional coatings are also available.
38AU units use two--row segmented coils.
TUBES
FINS
MICROCHANNELS
MANIFOLD
C07273
Fig. 33 -- NOVATION Heat Exchanger Coil
Model number designation: See Fig. 2 for general unit
model number format. Position 11 indicates the coil type
and coating. Position 11 values of G, K, T and W indicate
NOVATION coil type is on this unit.
Round--Tube Plate--Fin (RTPF) Type —
This construc tion uses a series of small diameter copper
hairpin tubes running horizontally with vertic al plate fins.
The pl ate fins may be aluminum (standard) or copper
(optional). Various optional coatings are also avai lable.
38AU units use two--row segmented coils.
Model number designation: See Fig. 2 for general unit
model number format. Position 11 indicates the coil type
and coating. Position 11 values of A, B, C, M, N and P
indicate RTPF coil type is on this unit.
NOVATION Coil Cleaning and Maintenance —
To clean the NOVATION condenser coil, chemicals are
NOT to be us ed; only water is approved as the cleaning
solu tio n. O n ly clean potable water is authorized for cleaning
NOVATION condensers.
Clean the coil a s follows:
1. Turn off uni t power.
2. Remove screws holding rear corner posts and top cover
in p lace. P iv ot top cov er up 30 5 to 457 mm (12 to
18 in.) and support with a rigid support. See Fig. 34.
C10216
Fig. 34 -- Pivot and Support Top Cover
3. Carefully remove any foreign objects or debris at-
tached to the coil face or trapped within the mounting
frame and brackets.
4. Using a high pressure water sprayer, purge any soap
or industria l cleaners from hose and/or dilution tank
prior to wetting the coil. Clean condenser face by
spraying the coil core ste adily and uniformly from top
to bottom, directing the spray straight into or toward
the coil face. Do not exceed 6205 kPa (900 psig) or a
45 degree angle; nozzle must be at least 30 cm
(12 in.) from the coil face. Reduce pressure and use
caution to prevent damage to air centers (fins). Do not
fracture the braze between air centers and refrigerant
tubes. Allow water to drain from the coil core and
check for refrigerant leaks prior to start up.
5. Replace top cover a nd rear corner posts.
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
dama ge.
Chemical cleaning should NOT be used on the
aluminum microchannel (NOVATION) condenser.
Damage to the coil may occur. Only approved
cleaning is recommended.
CAUTION
!
Repairing NOVATION Condenser Tube Leaks —
RCD offers service repair kit Part Number 50TJ660007 for
repairing tube leaks in the NOVATION coil crosstubes. This
kit includes approved braze materials (aluminum fluxcore
braze rods ), a heat sh ield, a stainles s steel brush , replacement
fin segments , adhesiv e for replacing fin seg ments , and
instr u ction s specific to the NOVATION aluminum coil. See
EPIC for instruction sheet 99TA526379.
38AU
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