9
Reinstalling Motor and Fan Assembly
See Fig. 13.
1. Align motor harness/grommet at ~7 o’clock (facing
installer) and align the bottom flats on right and left sides
of fan stator with fan deck ribs. Drop fan assembly down
into fan deck opening and slide back until aluminum stator
is under the rear fan deck brackets.
2. Align (if necessary) two front holes and fasten stator to
fan deck with 2 #10 x
5
/
8
-in. hex head screws (P/N:
AL48AM217). Tighten to 50 in.-lb (5.65 Nm).
3. Reconnect wires for stator temperature limit switch.
4. Pull motor harness tight through grommet and plug it in to
the control box harness and secure in the corner with snap-
in wire tie.
Fig. 13 — Fan Assembly Install
Staged Air Volume
All 549K units with Axion™ Fan 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 oper
-
ate at 75% of the user set full load airflow. When the second
stage of cooling is required, UCB will allow the full design air
-
flow rate for the unit (100%). During the heating mode, the
unit will allow total design airflow rate (100%). During venti
-
lation mode, the fan will operate at 75% speed.
See Table 1 on page 5 for 2-Pin DIP switch settings.
COOLING
Condenser Coil (Outdoor)
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
fabricated with a single return bend end tubesheet.
Evaporator Coil (Indoor)
The evaporator coil is traditional round-tube, plate-fin technolo
-
gy. Tube and fin construction is of various optional materials and
coatings (see APPENDIX A — MODEL NUMBER NOMEN
CLATURE on page 52). Coils are multiple-row.
Condenser Coil Maintenance and Cleaning
Recommendation
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 may 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 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
applied in coastal or industrial environments. However, it is
very important that the water rinse is made with a very low ve
-
locity water stream to avoid damaging the fin edges. Monthly
cleaning as described below is recommended. Rinsing coils in
the opposite direction of airflow is recommended.
ROUTINE CLEANING OF COIL SURFACES
Periodic cleaning with Totaline
®
environmentally balanced coil
cleaner is essential to extend the life of coils. This cleaner is avail
-
able from Replacement Components Division as part number
P902-0301 for a one gallon container, and part number P902-0305
for a 5 gallon container. It is recommended that all coils, including
standard aluminum, pre-coated, copper/copper or e-coated coils
be cleaned with the Totaline environmentally balanced coil clean
-
er 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 use of:
• coil brighteners
• acid cleaning prior to painting
• high pressure washers
• poor quality water for cleaning
Totaline environmentally balanced coil cleaner is nonflamma
-
ble, hypo-allergenic, non-bacterial, and a USDA accepted bio
-
degradable 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 strong
-
ly discouraged since coil and unit durability could be affected.
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
refrigerant may be used in this system. Gage set, hoses, and
recovery system must be designed to handle R
-
410A
refrigerant. If unsure about equipment, consult the
equipment manufacturer.
1
3
4
2
Summary of Contents for Preferred 549K 04-06
Page 84: ...84 APPENDIX D WIRING DIAGRAMS Fig F 549K 04 06 Power Wiring Diagram 208 230 1 60...
Page 85: ...85 APPENDIX D WIRING DIAGRAMS Fig G 549K 04 06 Power Wiring Diagram 208 230 3 60...
Page 86: ...86 APPENDIX D WIRING DIAGRAMS Fig H 549K 04 06 Power Wiring Diagram 460 575 3 60...
Page 89: ......
