Carrier 38AU - Manual (Page 33)

33
NOVATION™ Coil Cleaning and Maintenance —
To clean the NOVATION condenser coil, chemicals are NOT
to be used; only water is approved as the cleaning solution.
Only clean potable water is authorized for cleaning
NOVATION condensers.
Clean the coil as follows:
1. Turn off unit power.
2. Remove screws holding rear corner posts and top cover
in place. Pivot top cover up 305 to 457 mm (12 to 18 in.)
and support with a rigid support. See Fig. 31
Fig. 31 — Pivot and Support Top Cover
3. Carefully remove any foreign objects or debris attached
to the coil face or trapped within the mounting frame and
brackets.
4. Using a high pressure water sprayer, purge any soap or
industrial cleaners from hose and/or dilution tank prior to
wetting the coil.Clean condenser face by spraying the coil
core steadily and uniformly from top to bottom, directing
the spray straight into or toward the coil face. Do not
exceed 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 and rear corner posts.
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 shield, a stainless steel brush, replacement fin
segments, adhesive for replacing fin segments, and instructions
specific to the NOVATION aluminum coil. See EPIC for
instruction sheet 99TA526379.
The repair procedure requires the use of MAPP gas and torch
(must be supplied by servicer) instead of conventional
oxyacetylene fuel and torch. While the flame temperature for
MAPP is lower than that of oxyacetylene (and thus provides
more flexibility when working on aluminum), the flame
temperature is still higher than the melting temperature of
aluminum, so user caution is required. Follow instructions
carefully. Use the heat shield.
Replacing NOVATION Condenser Coil
The service replacement coil is preformed and is equipped with
transition joints with copper stub tubes. When brazing the
connection joints to the unit tubing, use a wet cloth around the
aluminum tube at the transition joint. Avoid applying torch
flame directly onto the aluminum tubing.
Service Parts
Listings of service parts for all units are available from the Re-
placement Components Division’s Electronic Parts Informa-
tion Catalog (EPIC). EPIC is available at Totaline stores, dis-
tributor and service office parts departments and on-line at
HVACPartners.com.
When entering EPIC, the full unit model number is required.
The model number includes the Design Revision reference val-
ue (see Fig. 2, Position 13). The unit model number is available
from the unit’s information data plate. (Do not use the “catalog
number” when using EPIC. The “catalog number” suppresses
the Design Revision value; failure to include Design Revision
value may cause an incorrect unit parts list to be displayed.)
When using EPIC, enter first four digits of the model number
only. Find appropriate model from sales packages listed. Be
sure to choose correct voltage and Design Revision.
EPIC is a product of RCD. To comment of the EPIC program,
use the “Comment” button inside the EPIC program.
FASTENER TORQUE VALUES
Table 15 — Torque Values
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in damage to
equipment.
Chemical cleaning should NOT be used on the aluminum
microchannel (NOVATION) condenser. Damage to the coil
may occur. Only approved cleaning is recommended.
Compressor mounting bolts 734–847 N–cm (65–75 in–lbs)
Condenser fan motor mounting bolts 226 ±23 N–cm (20 ±2 in–lbs)
Condenser fan hub setscrew 949 ±136 N–cm (84 ±2 in–lbs)
High-flow service port 1085 ±23 N–cm (96 ±10 in–lbs)
Schrader-type service check valve 23–34 N–cm (2–3 in–lbs)