Bosch SM024 Specifications Page 40
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40 | Sequence of Operation SM Series Heat Pump
SM Series Heat Pump6 720 220 406 (2013/1) Subject to change without prior notice
SEQUENCE OF OPERATION
Cooling Mode
Energizing the “O” terminal energizes the unit
reversing valve in the cooling mode. The fan motor
starts when the “G” terminal is energized. Note
that the fan motor will take 30 seconds to ramp up
to operating speed and will run at fan only rated air
fl ow as long as there is no call for compressor or
heater operation.
When the thermostat calls for first stage cooling
(Y1) the loop pump or solenoid valve if present is
energized and the first stage of compressor
capacity starts. The fan ramps up to first stage
cooling air flow in 30 seconds.
When the thermostat calls for second stage
cooling (Y2) the second stage (or full compressor
capacity) is initiated. The fan ramps up to full
cooling air flow.
Once the thermostat is satisfied, the compressor
shuts down accordingly and the fan ramps down to
either fan only mode or off over a span of 30
seconds.
Heating Mode
The first two stages of heating (Y1 & Y2) operate in
the same manner as cooling, but with the reversing
valve de-energized. On a call for auxiliary heat
(W1), the fan ramps up to auxiliary heat air fl ow
immediately and the electric heater package is
energized along with the compressor. As the
thermostat is satisfied, the heaters will shut off as
soon as W1 is de-energized, and the compressors
will remain on until the thermostat stages are
satisfied. Note that if the unit compressor lock out
for any reason at this time, the electric heaters will
continue to function normally. Once the
thermostat is satisfied, the compressor shuts
down and the fan ramps down either fan only
mode or off over a span of 30 seconds. If
thermostat has two different output points one for
Auxiliary heat and a different one for Emergency
heat the two outputs must be terminated on W1
units equipped with one stage of Electric heat.
(Figure #104)
Note that a fault condition initiating a lockout will
de-energize the compressor irrespective of
which stage is engaged.
When using a 2-cool, 3-heat thermostat W1 and
W2/EM must be connected together via a
jumper.
- 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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