9
HEAT PUMP REFRIGERATION
SYSTEM
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal
injury, death and/or equipment damage.
This system uses Puron
(R410A) refrigerant that
operates at higher pressures than standard R−22
systems and other refrigerants. No other refrigerant
can 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.
!
WARNING
Outdoor Coil
The 50TCQ outdoor coil is fabricated with round tube
copper hairpins and plate fins of various materials and/or
coatings (see “Appendix I − Model Number Significance”
to identify the materials provided in this unit). All unit
sizes use composite−type two−row coils. Composite
two−row coils are two single−row coils fabricated with a
single return bend end tubesheet.
Indoor Coil
The indoor coil is traditional round−tube, plate−fin
technology. Tube and fin construction is of various
optional materials and coatings (see Model Number
Format). Coils are multiple−row.
Recommended Outdoor 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 extend 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 can be used. In either case,
the tool should be applied in the direction of the fins. Coil
surfaces can be easily damaged (fin edges can be easily
bent over and damage the coating of a protected coil)
when 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 and dirt 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 applied in coastal or industrial environments.
However, it is very important that the water rinse is made
with very low velocity water stream to avoid damaging
the fin edges. Monthly cleaning as described below is
recommended.
PERSONAL INJURY AND UNIT DAMAGE
HAZARD
Failure to follow this caution can result in personal
injury or equipment damage.
Only approved cleaning is recommended.
CAUTION
!
Routine Cleaning of Indoor Coil Surfaces:
Periodic cleaning with Totaline
®
Environmentally Sound
Coil Cleaner is essential in extending the life of coils.
This cleaner is available from Carrier Replacement
Components Division (p/n P902−0301 for one gallon
[3.8L] container, and p/n P902−0305 for a 5 gallon [19L]
container). It is recommended that all coils (including
standard aluminum, pre−coated, copper/copper or
E−coated 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 ensuring the long life
of the coil. Failure to clean the coils can 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 Sound Coil Cleaner is non−
flammable, hypoallergenic, non bacterial and a 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
because coil and unit durability can be affected.
Clean coil as follows:
1. Turn off unit power. Use lockout/tagout procedures
on unit power switch.
2. Remove top panel screws on outdoor coil end of unit.
3. Remove coil corner post. See Fig. 12. To hold top
panel open, place coil corner post between top panel
and center post. See Fig. 13.
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