Bosch SM024 Specifications Page 50
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- TROUBLESHOOTING
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50 | troubleshooting SM Series Heat Pump
SM Series Heat Pump6 720 220 406 (2013/1) Subject to change without prior notice
Compressor Ohms
Model Start Winding Run Winding
SM024 1.64 1.3
SM036 1.52 0.88
SM048 1.86 0.52
SM060 1.63 0.39
SM070 1.85 0.34
Tolerance +/- 7%. All resistance values must be
measured with compressor at room temperature.
Comfort Alert Module -Flash Codes
Status LED
Status LED
Description
Status LED Troubleshooting Information Solution
YELLOW "ALERT"
FLASH CODE 3
Short Cycling
Compressor is
running only briefly
1. Thermostat demand signal is intermittent
2. Time delay relay or control board defective
3. If high pressure switch present go to Flash Code 2
information
4. If low pressure switch present go to Flash Code 1
information
YELLOW "ALERT"
FLASH CODE 4
Locked Rotor 1. Run capacitor has failed (may not be bad, verify)
2. Low line voltage (contact utility if voltage at disconnect
is low)
• Check wiring connections
3. Excessive liquid refrigerant in compressor
4. Compressor bearings are seized
• Measure compressor oil level
YELLOW "ALERT”
FLASH CODE 5
Open Circuit 1. Outdoor unit power disconnect is open
2. Compressor circuit breaker or fuse(s) is open
3. Compressor contactor has failed open
• Check compressor contactor wiring and connectors
• Check for compressor contactor failure (burned,
pitted or open)
• Check wiring and connectors between supply and
compressor
• Check for low pilot voltage at compressor contactor
coil
4. High pressure switch is open and requires manual reset
5. Open circuit in compressor supply wiring or
connections
6. Unusually long compressor protector reset time due to
extreme ambient temperature
7. Compressor windings are damaged
• Check compressor motor winding resistance
- Heat pump 1
- CONTENTS 2
- MODEL NOMENCLATURE 3
- STANDARD PACKAGE 4
- GENERAL DESCRIPTION 4
- MOVING AND STORAGE 5
- INITIAL INSPECTION 5
- LOCATION 5
- Figure # 6 6
- Figure # 7 6
- Figure # 4 6
- Figure # 5 6
- Figure # 20 9
- Figure # 21 9
- Figure # 22 9
- Figure # 23 9
- Figure # 24 9
- Figure # 25 10
- Figure # 26 10
- Figure # 27 10
- Figure # 28 10
- Figure # 29 10
- Figure # 33 11
- Figure # 34 11
- Figure # 30 11
- Figure # 31 11
- Figure # 32 11
- COUNTER-FLOW CONFIGURABILITY 12
- VERTICAL CONFIGURABILITY 12
- Figure # 39 Back Discharge 13
- Figure # 40 Side Discharge 13
- Figure # 41 13
- Required Tools 14
- Access to Internal Components 14
- Figure # 43 15
- Figure # 44 15
- Figure # 45 15
- Figure # 46 15
- Blower Re-configuration 16
- Figure # 56 18
- Figure # 57 18
- Figure # 58 18
- Figure # 59 18
- Figure # 60 18
- Ensure to retain the spring 19
- HRP Switch Relocation 20
- Electric Heat Relocation 21
- Figure # 80 23
- Figure # 81 23
- Figure # 82 23
- Figure # 83 23
- Reinstall All Panels 24
- Figure # 87 25
- Figure # 88 25
- Figure # 89 25
- Figure # 90 25
- Figure # 91 25
- RETURN AND DISCHARGE DUCT 26
- MOUNTING VERTICAL UNITS 27
- MOUNTING HORIZONTAL UNITS 27
- CONDENSATE DRAIN 27
- DUCT SYSTEM 28
- ELECTRICAL 29
- Figure # 96 30
- Figure # 97 30
- Figure # 98 31
- Figure # 99 31
- ECM INTERFACE BOARD 33
- Hot Gas Reheat (HGRH) 35
- Electric Heat 35
- Heat Recovery Package (HRP) 35
- Figure # 101 36
- Figure # 102 36
- HEAT RECOVERY PACKAGE 38
- Water Tank Preparation 38
- HR Water Piping 38
- Water Tank Refill 38
- Initial Start-Up 39
- SEQUENCE OF OPERATION 40
- Cooling Mode 40
- Heating Mode 40
- APPLICATION CONSIDERATIONS 42
- Well Water Systems 42
- Cooling Tower/Boiler Systems 42
- Geothermal Systems 43
- Figure # 107 44
- SYSTEM CHECKOUT 45
- UNIT START-UP 45
- MAINTENANCE 45
- UNIT CHECK-OUT SHEET 47
- Customer Data 47
- Unit Nameplate Data 47
- Operating Conditions 47
- Auxiliary Heat 47
- UPM Board LED Indications 48
- Unit Troubleshooting 48
- Compressor Ohms 50
- HRP Troubleshooting 51
- ELECTRONIC THERMOSTAT 52
- INSTALLATION 52
- OPERATING TEMPERATURES AND 53
- PRESSURES 53
- COOLING HEATING 54
- AIRFLOW TABLES 58
- (SM0**-***-*** 58
- Table(SM0**-***-***-T*) 59
- WIRING DIAGRAMS 60
- Figure # 114 61
- Figure # 115 62
- Figure # 116 63
- Figure # 117 64
- Figure # 118 65
- Figure # 119 66
- WIRING HARNESS DRAWINGS 67
- Figure # 121 68
- SPARE PARTS LIST 69
- Vertical (VT) 69
- VT Parts List - Cabinet 71
- VT Parts List - Blower 72
- Electrical 73
- 6 720 220 408 (02) 74
- Horizontal (HZ) 76
- HZ Part List - Cabinet 78
- HZ Parts List - Blower 79
- HZ Parts List - Refrigeration 80
- HZ Part List - Panels 81
- HZ Part List - Detailed View 82
- Counter Flow Part List 83
- 6 720 220 430 (00) 85
- DIMENSIONAL DRAWINGS 90
- Horizontal - Straight Through 91
- Figure # 139 92
- Counter Flow 93
- Vertical 94
- Revised 05-12 96
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