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TROUBLESHOOTING
38
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Complete Unit Stoppage
38
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Restart Procedure
38
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Alarms and Alerts
38
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Module Communication
45
. . . . . . . . . . . . . . . . . . . . . .
Communication Failures
45
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling Troubleshooting
46
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Humidi--MiZer
t
Troubleshooting
47
. . . . . . . . . . . . . . . . . . . .
Economizer Troubleshooting
48
. . . . . . . . . . . . . . . . . . . . . . . . .
Heating Troubleshooting
49
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Phase Loss Protection
52
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermistor Troubleshooting
52
. . . . . . . . . . . . . . . . . . . . . . . . .
Transducer Troubleshooting
54
. . . . . . . . . . . . . . . . . . . . . . . . .
Forcing Inputs and Outputs
54
. . . . . . . . . . . . . . . . . . . . . . . . . .
MAJOR SYSTEM COMPONENTS
57
. . . . . . . . . . . . . . . . . . . .
General
57
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Base Board (MBB)
75
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Economizer Control Board (ECB)
77
. . . . . . . . . . . . . . . . . . . . .
Integrated Gas Control (IGC) Board
79
. . . . . . . . . . . . . . . . . . .
Low Voltage Terminal Strip (TB1)
80
. . . . . . . . . . . . . . . . . . . . .
Scrolling Marquee Display
81
. . . . . . . . . . . . . . . . . . . . . . . . . .
Accessory Navigator
t
Display
81
. . . . . . . . . . . . . . . . . . . . . . .
Carrier Comfort Network (CCN)
R
Interface
81
. . . . . . . . . . . . .
Subcooler Heat Exchanger (SHX 48/50PG20--28 Only)
82
. . . .
Field--Installed Accessories
83
. . . . . . . . . . . . . . . . . . . . . . . . . .
SERVICE
86
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning
86
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lubrication
86
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Evaporator Fan Service and Replacement
89
. . . . . . . . . . . . . . .
Evaporator Fan Performance Adjustment
90
. . . . . . . . . . . . . . .
Evaporator Fan Belt Tension Adjustment
90
. . . . . . . . . . . . . . .
Condenser--Fan Adjustment
91
. . . . . . . . . . . . . . . . . . . . . . . . . .
NOVATION Heat Exchanger Condenser
Service and Replacement
91
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Verify Sensor Performance
91
. . . . . . . . . . . . . . . . . . . . . . . . . .
Economizer Operation During Power Failure
91
. . . . . . . . . . . .
Evacuation
91
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Refrigerant Charge
92
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Valve Adjustment (48PG and 48PM)
96
. . . . . . . . . . . . . . .
High Altitude (48PG and 48PM)
96
. . . . . . . . . . . . . . . . . . . . . .
Main Burners (48PG and 48PM)
96
. . . . . . . . . . . . . . . . . . . . . .
Filter Drier
98
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Protective Devices
98
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Relief Devices
98
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Circuit, 24--V
98
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacement Parts
98
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic LEDs
98
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
APPENDIX A -- LOCAL DISPLAY AND
CCN TABLES
99
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
APPENDIX B -- CONTROL MODES WITH
Humidi--MiZer
t
SYSTEM AND ECONOMIZER
116
. . . . . . . .
APPENDIX C -- START--UP DATA
118
. . . . . . . . . . . . . . . . . . .
APPENDIX D -- ADDITIONAL START--UP DATA
185
. . . . . .
UNIT START--UP CHECKLIST
207
. . . . . . . . . . . . . . . . . . . . . .
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 may 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. 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 alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety--alert symbol.
DANGER identifies the most serious hazards which
will
result in
severe personal injury or death. WARNING signifies a hazard
which
could
result in personal injury or death. CAUTION is used
to identify unsafe practices which
may
result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which
will
result in enhanced installation, reliability, or
operation.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal
injury or death.
Before performing service or maintenance operations
on unit, turn off main power switch to unit and install
lockout tag. Ensure electrical service to rooftop unit
agrees with voltage and amperage listed on the unit
rating plate.
!
WARNING
UNIT DAMAGE HAZARD
Failure to follow this caution may cause equipment
damage.
This unit uses a microprocessor--based electronic control
system. Do not use jumpers or other tools to short out
components or to bypass or otherwise depart from
recommended procedures. Any short--to--ground of the
control board or accompanying wiring may destroy the
electronic modules or electrical components.
CAUTION
!
48/
50P
G
and
P
M
Summary of Contents for 48/50PG Series
Page 32: ...32 C07009 Fig 20 Air Baffle Dimensions 48 50PG03 16 48 50PG and PM...
Page 33: ...33 C08077 Fig 21 Air Baffle Dimensions 48 50PG20 28 and 48 50PM16 28 48 50PG and PM...
Page 58: ...58 C08549 Fig 28 48PG03 16 Control Wiring Schematic 48 50PG and PM...
Page 59: ...59 C08550 Fig 29 50PG03 16 Control Wiring Schematic 48 50PG and PM...
Page 64: ...64 C08471 Fig 34 Typical 48PG and PM16 28 Control Schematic 48PM16 28 Shown 48 50PG and PM...
Page 66: ...66 C08557 Fig 36 Typical 50PG and PM16 28 Control Schematic 50PG20 28 Shown 48 50PG and PM...
Page 68: ...68 C08558 Fig 38 Typical 48 50PG and PM16 28 Power Schematic 48 50PM16 28 Shown 48 50PG and PM...
Page 72: ...72 C08565 Fig 42 Typical 48 50PG20 28 Component Arrangement 48 50PG20 24 Shown 48 50PG and PM...
Page 73: ...73 C08067 Fig 43 48 50PM16 28 Component Arrangement 48 50PG and PM...
Page 74: ...74 C08562 Fig 44 48 50PM16 28 with Humidi MiZert Component Arrangement 48 50PG and PM...
Page 208: ...208 48 50PG and PM...