Heat Pump Refrigeration System; Outdoor Coil; Indoor Coil; Recommended Outdoor Coil Maintenance And Cleaning - Carrier WeatherMaker 50KCQ A04 Series Service And Maintenance Instructions

HEAT PUMP REFRIGERATION SYSTEM

WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury,
death and/or equipment damage.
This system uses R-410A refrigerant, which has higher
pressures than R-22 and other refrigerants. No other refrig-
erant may be used in this system. Gage set, hoses, and re-
covery system must be designed to handle R-410A refriger-
ant. If unsure about equipment, consult the equipment man-
ufacturer.

Outdoor Coil

The 50KCQ outdoor coil is fabricated with round tube copper
hairpins and plate fins of various materials and/or coatings (see
"Appendix A - Model Number Significance" on page 58 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 "APPENDIX A — MODEL NUMBER NO-
MENCLATURE" on page 58). 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 remov-
al 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-metal-
lic 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 ve-
locity water stream to avoid damaging the fin edges. Monthly
cleaning as described in the following section is recommended.
CAUTION
PERSONAL INJURY AND UNIT DAMAGE HAZARD
Failure to follow this caution can result in personal injury or
equipment damage.
Only approved cleaning is recommended.
ROUTINE CLEANING OF INDOOR COIL SURFACES:
Periodic cleaning with Totaline
Cleaner is essential in extending the life of coils. This cleaner
is available from Carrier Replacement Components Division
(part number P902-0301 for one gallon [3.8L] container, and
part number 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 be-
low. Coil cleaning should be part of the unit's regularly sched-
uled maintenance procedures to ensure 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-flamma-
ble, hypoallergenic, non-bacterial and a USDA accepted biode-
gradable agent that will not harm the coil or surrounding com-
ponents, such as electrical wiring, painted metal surfaces or in-
sulation. 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/tag-out 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.
Fig. 12 — Cleaning Condenser Coil
Fig. 13 — Propping Up Top Panel
8
Environmentally Sound Coil
®