Microchannel Heat Exchanger Condenser Coil Maintenance And Cleaning Recommendations; Round Tube Plate Fin (Rtpf) Condenser Coil Maintenance And Cleaning Recommendations; Remove Surface Loaded Fibers; Periodic Clean Water Rinse - Carrier AquaSnap 30RAP011-060 Controls, Start-Up, Operation, Service, And Troubleshooting

UNIT SIZES 100-150
MANUFACTURER
Totaline. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P903-2401
Uniqema (ICI) . . . . . . . . . . . . . . . . . . . Emkarate RL 32H
Do not reuse drained oil or any oil that has been exposed to the
atmosphere.
Microchannel Heat Exchanger Condenser Coil
Maintenance and Cleaning Recommendations
CAUTION
Do not apply any chemical cleaners to MCHX condenser coils.
These cleaners can accelerate corrosion and damage the coil.
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 steps should be taken to
clean MCHX condenser coils:
1. Remove any foreign objects or debris attached to the coil
face or trapped within the mounting frame and brackets.
2. Put on personal protective equipment including safety
glasses and/or face shield, waterproof clothing, and
gloves. It is recommended to use full coverage clothing.
3. Start high pressure water sprayer and purge any soap or
industrial cleaners from sprayer before cleaning condenser
coils. Only clean, potable water is authorized for cleaning
condenser coils.
4. Clean condenser face by spraying the coil steadily and uni-
formly from top to bottom while directing the spray
straight toward the coil. Do not exceed 900 psig or
30 degree angle. The nozzle must be at least 12 in. from
the coil face. Reduce pressure and use caution to prevent
damage to air centers.
Round Tube Plate Fin (RTPF) Condenser Coil
Maintenance and Cleaning Recommendations
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
water 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 very low velocity water
stream to avoid damaging the fin edges. Monthly cleaning is rec-
ommended.

ROUTINE CLEANING OF COIL SURFACES

Routine cleaning with Totaline
cleaner is essential to extend the life of coils. This cleaner is avail-
able from Carrier Replacement parts division as part number
OIL
environmentally balanced coil
®
P902-0301 for a one-gallon container, and part number P902-0305
for a 5-gallon container. It is recommended that all coils, including
the standard copper tube aluminum fin, pre-coated fin, copper fin,
or e-coated coils be cleaned with the Totaline environmentally bal-
anced 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 the use of:
• coil brighteners
• acid cleaning prior to painting
• high pressure washers
• poor quality water for cleaning
Totaline environmentally balanced coil cleaner is non-flammable,
hypoallergenic, nonbacterial, and a USDA accepted biodegrad-
able 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.
Excessive water pressure will fracture the braze between air
centers and refrigerant tubes.

Check Refrigerant Feed Components

FILTER DRIER

The function of the filter drier is to maintain a clean, dry system.
The moisture indicator (described below) indicates any need to
change the filter drier. The filter drier is a sealed-type drier. When
the drier needs to be changed, the entire filter drier must be
replaced.
NOTE: Dual circuit (035-150 sizes) units have 1 filter drier per
circuit.

MOISTURE-LIQUID INDICATOR

The indicator is located immediately ahead of the EXV to provide
an indication of the refrigerant moisture content. It also provides a
sight glass for refrigerant liquid. Clear flow of liquid refrigerant (at
full unit loading) indicates sufficient charge in the system. Bubbles
in the sight glass (at full unit loading) indicate an undercharged sys-
tem or the presence of noncondensables. Moisture in the system,
measured in parts per million (ppm), changes the color of the indi-
cator as follows:
Green (safe) — Moisture is below 75 ppm
Yellow-Green (caution) — 75 to 150 ppm
Yellow (wet) — above 150 ppm
The unit must be in operation at least 12 hours before the moisture
indicator gives an accurate reading, and must be in contact with
liquid refrigerant. At the first sign of moisture in the system,
change the corresponding filter drier.
NOTE: Dual circuit (035-150 sizes) units have one indicator per
circuit.

MINIMUM LOAD VALVE

On units equipped with the factory-installed capacity reduction
option, a solenoid valve and discharge bypass valve (minimum
load valve) are located between the discharge line and the cooler
entering-refrigerant line. The MBB cycles the solenoid to perform
minimum load valve function and the discharge bypass valve
modulates to the suction pressure set point and the valve.
The amount of capacity reduction achieved by the minimum load
valve is not adjustable. The total unit capacity with the minimum
load valve is shown in Table 13.

PRESSURE RELIEF DEVICES

All units have one pressure relief device per circuit located in the
liquid line which relieves at 210°F (100°C).
61
CAUTION