Service and Maintenance Instructions
48HC*D17–D28
Nominal 15 to 25 Tons
with Puron
(R---410A) Refrigerant
TABLE OF CONTENTS
SAFETY CONSIDERATIONS
1
. . . . . . . . . . . . . . . . . . . .
UNIT ARRANGEMENT AND ACCESS
3
. . . . . . . . . . .
SUPPLY FAN (BLOWER) SECTION
4
. . . . . . . . . . . . . .
STAGED AIR VOLUME (SAV) CONTROL: 2--SPEED
FAN WITH VARIABLE FREQUENCY DRIVE (VFD)
6
. . .
ADDITIONAL VFD INSTALLATION AND
TROUBLESHOOTING
7
. . . . . . . . . . . . . . . . . . . . . . . . . .
MOTOR
7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CONDENSER COIL SERVICE
9
. . . . . . . . . . . . . . . . . . .
EVAPORATOR COILS
10
. . . . . . . . . . . . . . . . . . . . . . . . .
HUMIDI--MIZER ADAPTIVE DEHUMIDIFICATION
SYSTEM
12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THERMOSTATIC EXPANSION VALVE (TXV)
18
. . . .
PURON
R
(R--410A) REFRIGERANT
20
. . . . . . . . . . . . .
COOLING CHARGING CHARTS
22
. . . . . . . . . . . . . . . .
COMPRESSORS
26
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CONVENIENCE OUTLETS
29
. . . . . . . . . . . . . . . . . . . .
SMOKE DETECTORS
30
. . . . . . . . . . . . . . . . . . . . . . . . .
INDICATORS
36
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PROTECTIVE DEVICES
37
. . . . . . . . . . . . . . . . . . . . . . .
PREMIERLINK
t
CONTROL
39
. . . . . . . . . . . . . . . . . . .
RTU--OPEN CONTROL SYSTEM
40
. . . . . . . . . . . . . . . .
SENSORY/ACCESSORY INSTALLATION
40
. . . . . . . .
GAS HEATING SYSTEM
42
. . . . . . . . . . . . . . . . . . . . . .
ECONOMI$ER SYSTEMS
53
. . . . . . . . . . . . . . . . . . . . . .
PRE--START--UP
62
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
START--UP, GENERAL
62
. . . . . . . . . . . . . . . . . . . . . . . .
START--UP, PREMIERLINK CONTROLS
64
. . . . . . . . .
START--UP, RTU--OPEN CONTROL
65
. . . . . . . . . . . . . .
FASTENER TORQUE VALUES
65
. . . . . . . . . . . . . . . . .
APPENDIX I. MODEL NUMBER SIGNIFICANCE
66
.
APPENDIX II. PHYSICAL DATA
67
. . . . . . . . . . . . . . . .
APPENDIX III. FAN PERFORMANCE
70
. . . . . . . . . . .
APPENDIX IV. WIRING DIAGRAMS
75
. . . . . . . . . . . .
APPENDIX V. MOTORMASTER SENSOR
LOCATIONS
88
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UNIT START-UP CHECKLIST
89
. . . . . . . . . . . . . . . . . .
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical
components. Only trained and qualified service personnel
should install, repair, or service air-conditioning
equipment. Untrained personnel can perform the basic
maintenance functions of replacing filters. Trained service
personnel should perform all other operations.
When working on air-conditioning equipment, observe
precautions in the literature, tags and labels attached to
the unit, and other safety precautions that can apply.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations.
Have fire extinguishers available for all brazing
operations.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for brazing operations. Have
fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions attached to
the unit. Consult local building codes and National
Electrical Code (NEC) for special requirements.
Recognize safety information. This is the safety--ALERT
symbol
. When you see this symbol on the unit and in
instructions or manuals, be aware of the potential for
physical injury hazards.
Understand the signal words
DANGER
,
WARNING
, and
CAUTION
. These words are used with the safety--ALERT
symbol.
DANGER
indicates a hazardous situation which,
if not avoided,
will
result in death or severe personal
injury.
WARNING
indicates a hazardous situation which,
if not avoided,
could
result in death or personal injury.
CAUTION
indicates a hazardous situation which, if not
avoided,
could
result in minor to moderate injury or
product and property damage.
NOTICE
is used to address
practices not related to physical injury.
NOTE
is used to
Summary of Contents for 48HC D17 Series
Page 77: ...77 APPENDIX IV WIRING DIAGRAMS C12616 Fig 77 48HC D17 D28 Power Diagram 208 230 3 60 48HC...
Page 78: ...78 APPENDIX IV WIRING DIAGRAMS C12617 Fig 78 48HC D17 D28 Power Diagram 460 3 60 48HC...
Page 79: ...79 APPENDIX IV WIRING DIAGRAMS C12618 Fig 79 48HC D17 D28 Power Diagram 575 3 60 48HC...
Page 86: ...86 APPENDIX IV WIRING DIAGRAMS C13767 Fig 86 RTU OPEN Wiring Diagram 48HC...
Page 87: ...87 APPENDIX IV WIRING DIAGRAMS C13768 Fig 87 RTU OPEN Wiring Diagram with Humidi MiZer 48HC...
