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6
Unit Installation with SAV Option
50TCQ ROOFTOP
Refer to the base unit installation instructions for standard required
operating and service clearances.
NOTE: The Remote VFD Keypad is a field-installed option. It is
not included as part of the factory-installed VFD option. See
“Variable Frequency Drive (VFD) Installation, Setup and Trouble
-
shooting Supplement” for wiring schematics and performance
charts and configuration. See Fig. 9 for location of the VFD as
mounted on the various 50TCQ models.
Fig. 9 —
VFD Location for 50TCQ 15-20 Ton Units
ADDITIONAL VFD INSTALLATION AND
TROUBLESHOOTING
Additional installation, wiring and troubleshooting information
for the VFD can be found in the following manuals: “Variable Fre
-
quency Drive (VFD) Installation, Setup and Troubleshooting Sup
-
plement.”
HEAT PUMP REFRIGERATION SYSTEM
Outdoor Coil
The 50TCQ outdoor coil is fabricated with round tube copper
hairpins and plate fins of various materials and/or coatings (see
Appendix A 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). Coils are multiple-row.
Recommended Coil Maintenance and Cleaning
Routine cleaning of coil surfaces is essential in maintaining 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 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 pro
-
tected 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 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 as de
-
scribed below is recommended.
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 a 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
Table 1 —
Model-Size / VFD Option Indicator
UNIT
POSITION
IN MODEL NUMBER
VFD FIOP
INDICATOR
50TCQ 17,24
17
G, J
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.
VARIABLE
FREQUENCY
DRIVE (VFD)
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution can result in reduced unit perfor
-
mance or unit shutdown.
Use only the recommended approved cleaning procedures for
proper system performance.
Summary of Contents for WeatherMaker 50TCQ 17-24 Series
Page 35: ...35 Fig 53 RTU Open Overlay for Economizer Wiring ...
Page 36: ...36 Fig 54 VFD Overlay for W2770 Controller Wiring ...
Page 68: ...68 Fig B 50TCQD17 24 Control Wiring Diagram APPENDIX D WIRING DIAGRAMS ...
Page 69: ...69 Fig C 50TCQD17 24 Power Wiring Diagram 208 230 3 60 Units APPENDIX D WIRING DIAGRAMS ...
Page 70: ...70 Fig D 50TCQD17 24 Power Wiring Diagram 460 3 60 575 3 60 Units APPENDIX D WIRING DIAGRAMS ...
Page 71: ...71 Fig E RTU Open Overlay APPENDIX D WIRING DIAGRAMS ...
Page 72: ...72 Fig F PremierLink Overlay APPENDIX D WIRING DIAGRAMS ...