Carrier 50TCQD17-D24 Service And Maintenance Instructions page 8

Totaline Environmentally Sound Coil Cleaner
Application Equipment:
S 2.5 gal (9.5L) garden sprayer
S Water rinse with low velocity spray nozzle
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution can result in corrosion
and damage to the unit.
Harsh chemicals, household bleach, acid or basic
cleaners should not be used to clean outdoor or indoor
coils of any kind. These cleaners can be very difficult
to rinse out of the coil and can accelerate corrosion at
the fin/tube interface where dissimilar materials are in
contact. If there is dirt below the surface of the coil,
use the Totaline Environmentally Sound Coil Cleaner
as described below.
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution can result in reduced
unit performance.
High velocity water from a pressure washer, garden
hose, or compressed air should never be used to clean
a coil. The force of the water or air jet will bend the
fin edges and increase airside pressure drop.
Totaline Environmentally Sound Coil Cleaner
Application Instructions:
1. Proper protection equipment, such as approved safety
glasses and gloves, is recommended during mixing
and application of Totaline Environmentally Sound
Coil Cleaner.
2. Remove all surface loaded fibers and debris using a
vacuum cleaner or a soft non- - metallic bristle brush
as described above.
3. Thoroughly wet all finned surfaces with clean water
using a low velocity garden hose being careful not to
bend fins.
4. Mix Totaline Environmentally Sound Coil Cleaner in
a 2.5 gal (9.5L) garden spryer according to the in-
structions included with the cleaner. The optimum
solution temperature is 100F (38C).
NOTE: Do NOT USE water in excess of 130F (54C), as
the enzymatic activity will be destroyed.
5. Thoroughly apply Totaline Environmentally Sound
Coil Cleaner solution to all coil surfaces including
finned area, tube sheets and coil headers.
6. Hold garden sprayer nozzle close to finned areas and
apply cleaner with a vertical, up- - and- - down motion.
Avoid spraying in horizontal pattern to minimize poten-
tial for fin damage.
7. Ensure cleaner thoroughly penetrates deep into finned
areas.
8. Interior and exterior finned areas must be thoroughly
cleaned.
9. Finned surfaces should remain wet with cleaning
solution for 10 minutes.
10. Ensure surfaces are not allowed to dry before rinsing.
Reapply cleaner as needed to ensure 10- - minute satur-
ation is achieved.
11. Thoroughly rinse all surfaces with low velocity clean
water using downward rinsing motion of water spray
nozzle. Protect fins from damage from the spray
nozzle.
Indoor Coil
Cleaning the Indoor Coil:
1. Turn unit power off. Use proper Lockout/Tagout
procedures.
2. Remove indoor coil access panel.
3. If economizer or two- - position damper is installed, re-
move economizer by disconnecting the Molex plug
and removing mounting screws.
4. Slide filters out of unit.
5. Clean coil using a commercial coil cleaner or dish-
washer detergent in a pressurized spray canister. Wash
both sides of coil and flush with clean water. For best
results, back- - flush toward return- - air section to re-
move foreign material. Flush condensate pan after
completion.
6. Reinstall economizer and filters.
7. Reconnect wiring.
8. Replace access panels.
Refrigeration System Components:
Each heat pump refrigeration system includes a
compressor, accumulator, reversing valve, dual- - function
outdoor coil with vapor header check valve, cooling liquid
line with a filter drier and a check valve, dual- - function
indoor coil with a vapor header check valve, and heating
liquid line with check a valve and a strainer. Unit sizes
D17 - - D24 have two compressor circuits. See Fig. 12 for
typical unit piping schematic.
Dual- - function outdoor and indoor coils are designed to
provide parallel coil circuits during evaporator- - function
operation and converging coil circuits during the
condenser- - function operation.
Refrigerant flow metering in the evaporator- - function
sequence is provided by multiple Accutrol fixed- - bore
metering devices that are located in the tee nipples
between the liquid header and the entrance to each coil
circuit. The Accutrol metering device is brazed into the
nipple tube between the liquid header end and the
side- - port tube. See Fig. 13. During evaporator- - function
operation, flow is straight through the nipple and into each
evaporator circuit. Flow continues through the parallel
evaporator circuits and into the vapor header.
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