Bosch SM070 Specifications Page 49
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- TROUBLESHOOTING
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Troubleshooting | 49SM Series Heat Pump
6 720 220 406 (2013/9)Revised 08-13
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
- SM Series Heat pump 1
- CONTENTS 2
- MODEL NOMENCLATURE 3
- Figure # 2 4
- GENERAL DESCRIPTION 5
- MOVING AND STORAGE 6
- INITIAL INSPECTION 6
- LOCATION 6
- Figure # 4 7
- Figure # 5 7
- Figure # 6 7
- Figure # 7 7
- Figure # 20 10
- Figure # 21 10
- Figure # 22 10
- Figure # 23 10
- Figure # 24 10
- Figure # 27 11
- Figure # 28 11
- Figure # 29 11
- Figure # 25 11
- Figure # 26 11
- Figure # 30 12
- Figure # 31 12
- Figure # 32 12
- Figure # 33 12
- Figure # 34 12
- COUNTER-FLOW CONFIGURABILITY 13
- VERTICAL CONFIGURABILITY 13
- Figure # 39 Back Discharge 14
- Figure # 40 Side Discharge 14
- Figure # 41 14
- Required Tools 15
- Access to Internal Components 15
- Figure # 43 16
- Figure # 44 16
- Figure # 45 16
- Figure # 46 16
- Blower Re-Configuration 17
- Electric Heat Option 18
- Figure # 56 19
- Figure # 57 19
- Figure # 58 19
- Figure # 59 19
- Figure # 60 19
- Be sure to retain the spring 20
- HRP Switch Relocation 21
- Electric Heat Relocation 22
- Figure # 80 24
- Figure # 81 24
- Figure # 82 24
- Figure # 83 24
- Reinstall All Panels 25
- RETURN AND DISCHARGE DUCT 25
- MOUNTING VERTICAL UNITS 27
- MOUNTING HORIZONTAL UNITS 27
- CONDENSATE DRAIN 27
- DUCT SYSTEM 28
- ELECTRICAL 29
- Figure # 95 30
- Figure # 96 30
- Figure # 97 31
- Figure # 98 31
- ECM INTERFACE BOARD 33
- Airflow Selector 33
- Constant Torque Motors (ECM) 34
- Hot Gas Reheat (HGRH) 35
- Electric Heat 35
- Heat Recovery Package (HRP) 35
- Constant Airflow Motor 36
- DPS Water Flow Proving 36
- Pump Relay 36
- Comfort Alert Module 36
- HEAT RECOVERY PACKAGE 37
- Water Tank Preparation 37
- HR Water Piping 37
- Water Tank Refill 37
- Initial Start-Up 38
- SEQUENCE OF OPERATION 39
- Cooling Mode 39
- Heating Mode 39
- APPLICATION CONSIDERATIONS 41
- Well Water Systems 41
- Cooling Tower/Boiler Systems 41
- Figure # 104 42
- Geothermal Systems 43
- SYSTEM CHECKOUT 44
- UNIT START-UP 44
- MAINTENANCE 45
- UNIT CHECK-OUT SHEET 46
- Customer Data 46
- Unit Nameplate Data 46
- Operating Conditions 46
- Auxiliary Heat 46
- UPM Board LED Indications 47
- Unit Troubleshooting 47
- Compressor Ohms 49
- HRP Troubleshooting 50
- ELECTRONIC THERMOSTAT 51
- INSTALLATION 51
- OPERATING TEMPERATURES AND 52
- PRESSURES 52
- COOLING HEATING 53
- AIRFLOW TABLES 57
- (SM0**-***-*** 57
- Table(SM0**-***-***-A) 58
- WIRING DIAGRAMS 60
- Figure # 109 61
- Figure # 110 62
- Figure # 111 63
- Figure # 112 64
- Figure # 113 66
- Figure # 114 67
- WIRING HARNESS DRAWINGS 68
- Figure # 116 69
- SPARE PARTS LIST 70
- Vertical (VT) 70
- VT Parts List - Cabinet 72
- VT Parts List - Blower 73
- 6 720 220 408 (02) 74
- Horizontal (HZ) 77
- HZ Part List - Cabinet 79
- HZ Parts List - Blower 80
- HZ Parts List - Refrigeration 81
- HZ Part List - Panels 82
- HZ Part List - Detailed View 83
- Counter Flow Part List 84
- 6 720 220 430 (00) 86
- DIMENSIONAL DRAWINGS 91
- Horizontal - Straight Through 92
- Figure # 134 93
- Counter Flow 94
- Vertical 95
- Notes 97
- Notes 99
- Revised 08-13 100
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