Condenser Coil Service; Round Tube Plate Fin (Rtpf) Condenser Coil; Recommended Condenser Coil Maintenance And; Cleaning - Carrier WeatherMaker 50TC 17-30 Series Service And Maintenance Instructions

To reduce vibration, replace the motor's adjustable pitch pulley
with a fixed pitch pulley (after the final airflow balance adjust-
ment). This will reduce the amount of vibration generated by the
motor/belt-drive system.
To determine variable pitch pulley diameter, perform the follow-
ing calculation:
1. Determine full open and full closed pulley diameter.
2. Subtract the full open diameter from the full closed diameter.
3. Divide that number by the number of pulley turns open from
full closed.
This number is the change in pitch datum per turn open.
EXAMPLE:
• Pulley dimensions 2.9 to 3.9 (full close to full open)
• 3.9 - 2.9 = 1-in.
• 1 divided by 5 (turns from full close to full open)
• 0.2 change in pulley diameter per turn open
• 2.9 + 0.2 = 3.1 pulley diameter when pulley closed one
turn from full open.

CONDENSER COIL SERVICE

Round Tube Plate Fin (RTPF) Condenser Coil

The condenser coil is fabricated with round tube copper hairpins
and plate fins of various materials and/or coatings (see the model
number nomenclature in Appendix A to identify the materials pro-
vided in this unit). The coil may be one-row or composite-type
two-row. Composite two-row coils are two single-row coils fabri-
cated with a single return bend end tubesheet.
Recommended Condenser Coil Maintenance
and Cleaning
Routine cleaning of coil surfaces is essential to maintain proper
operation of the unit. Elimination of contamination and removal of
harmful residues will greatly increase the life of the coil and ex-
tend the life of the unit. The following maintenance and cleaning
procedures are recommended as part of the routine maintenance
activities to extend the life of the coil.
REMOVE SURFACE LOADED FIBERS
Surface loaded fibers or dirt should be removed with a vacuum
cleaner. If a vacuum cleaner is not available, a soft non-metallic
bristle brush may be used. In either case, the tool should be ap-
plied in the direction of the fins. Coil surfaces can be easily dam-
aged (fin edges can be easily bent over and damage to the coating
of a protected coil) if the tool is applied across the fins.
NOTE: Use of a water stream, such as a garden hose, against a
surface loaded coil will drive the fibers and dirt into the coil. This
will make cleaning efforts more difficult. Surface loaded fibers
must be completely removed prior to using low-velocity clean wa-
ter rinse.
PERIODIC CLEAN WATER RINSE
A periodic clean water rinse is very beneficial for coils that are ap-
plied in coastal or industrial environments. However, it is very im-
portant that the water rinse is made with a very low-velocity water
stream to avoid damaging the fin edges. Monthly cleaning as de-
scribed is recommended.
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution can result in reduced unit perfor-
mance or unit shutdown.
Use only the recommended approved cleaning procedures for
proper system performance.
ROUTINE CLEANING OF COIL SURFACES
Periodic cleaning with Totaline
cleaner is essential to extend the life of coils. This cleaner is avail-
able from Carrier Replacement Components Division as P/N:
P902-0301 for a one-gallon (3.8L) container, and P902-0305 for a
5-gallon (18.9L) container. It is recommended that all coils, in-
cluding standard aluminum, pre-coated, copper/copper or E-coat-
ed coils be cleaned with the Totaline environmentally sound coil
cleaner as described below.
Coil cleaning should be part of the unit's regularly scheduled
maintenance procedures to ensure long life of the coil. Failure to
clean the coils may result in reduced durability in the environment.
Avoid use of:
• coil brighteners
• acid cleaning prior to painting
• high pressure washers
• poor quality water for cleaning
Totaline environmentally sound coil cleaner is a nonflammable,
hypoallergenic, non bacterial, USDA accepted biodegradable
agent that will not harm the coil or surrounding components such
as electrical wiring, painted metal surfaces, or insulation. Use of
non-recommended coil cleaners is strongly discouraged since coil
and unit durability could be affected.
Two-Row Coils
Clean coil as follows:
1. Turn off unit power and tag the disconnect.
2. Remove the top panel screws on the condenser end of the
unit.
3. Remove the condenser coil corner post. See Fig. 12.
4. Lift and hold the top cover open.
5. Hold the top pan open by placing the coil corner post between
the top panel and center post. See Fig. 13.
6. Remove the screws securing the coil to the compressor plate
and compressor access panel.
7. Remove the fasteners holding the coil sections together at the
return end of the condenser coil. Carefully separate the outer
coil section 3 to 4 in. from the inner coil section. See Fig. 14.
8. Clean the outer surfaces with a stiff brush in the normal man-
ner. Use a water hose or other suitable equipment to flush
down between the 2 coil sections to remove dirt and debris.
9. Secure the inner and outer coil rows together with a field-sup-
plied fastener.
10. Reposition the outer coil section and remove the coil corner
post from between the top panel and center post. Reinstall the
coil corner post and access panel.
11. Replace all screws.
8
environmentally sound coil
®