Staged Air Volume; Cooling; Condenser Coil; Condenser Coil Maintenance And Cleaning - Carrier 48FC M20 Series Service And Maintenance Instructions

Single package rooftop gas heat/electric cooling unit with puron (r-410a) refrigerant 17.5-27.5 nominal tons
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Staged Air Volume

All 48FC units with EcoBlue™ technology come factory set to
automatically adjust the indoor fan motor speed in sequence with
the unit's ventilation, cooling, and heating operation. When the
first stage of cooling is requested, unit fan will operate at 66% of
the user set full load airflow. When the second stage of cooling is
required, UCB will allow the full design airflow rate for the unit
(100%). During the heating mode, the unit will allow total design
airflow rate (100%). During ventilation mode, the fan will operate
at 66% speed.

COOLING

WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury,
death and/or equipment damage.
This system uses Puron
®
sures than R-22 and other refrigerants. No other refrigerant
may be used in this system. Gauge set, hoses, and recovery
system must be designed to handle Puron refrigerant. If unsure
about equipment, consult the equipment manufacturer.

Condenser Coil

The condenser coil is fabricated with round tube copper hairpins
and plate fins of various materials and/or coatings (see Model
Number Nomenclature in Appendix A to identify the materials
provided 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.
Condenser Coil Maintenance and Cleaning 

Recommendation

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 fi-
bers 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 a very low velocity water
stream to avoid damaging the fin edges. Monthly cleaning as de-
scribed below is recommended. Rinsing coils in the opposite
direction of airflow is recommended.
refrigerant which has higher pres-
ROUTINE CLEANING OF COIL SURFACES
Periodic cleaning with Totaline
cleaner is essential to extend the life of coils. This cleaner is avail-
able from Replacement Components Division as P/N: P902-0301
for a one gallon container, and P/N: P902-0305 for a 5 gallon con-
tainer. It is recommended that all coils, including standard alumi-
num, pre-coated, copper/copper or e-coated coils be cleaned with
the Totaline environmentally balanced coil cleaner as described
below. Coil cleaning should be part of the unit's regularly sched-
uled maintenance procedures to ensure long life of the coil. Failure
to clean the coils may result in reduced durability in the environ-
ment.
Avoid use of:
coil brighteners
acid cleaning prior to painting
high pressure washers
poor quality water for cleaning
Totaline environmentally balanced coil cleaner is nonflammable,
hypo-allergenic, non-bacterial, 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.
Clean coil as follows:
1.
Turn off unit power, tag disconnect.
2.
Remove all screws from the top panel except the screws
securing the condenser fan to the top panel. See Fig. 17.
Remove Screws
from Top Panel
Condenser
Fan Screws
Fig. 17 — Location of Top Panel Screws and Coil
3.
Lift the top panel at the condenser fan end and support the
top panel so it remains level while resting on the con-
denser fans as shown in Fig. 18.
13
environmentally balanced coil
®
Remove Screws
from All Sides
of Top Panel
Condenser Fans
Corner Post

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