Bosch Greensource CDi Series - User Manual

Bosch Greensource CDi Series

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Installation, Operation and Maintenance Manual

Greensource CDi Series SM Model

8-733-942-411 (2017/07)

SM024 | SM036 | SM048 | SMO60 | SM070

Table of Contents

Questions and Answers:

R
rmccoySep 5, 2025
What to do if the fan on my Bosch Heat Pump isn't working?
- J
  James WilliamsSep 5, 2025
  If your Bosch Heat Pump's ECM constant airflow motor isn't operating, there could be several reasons. First, check for 24 VAC between "G" and "C" and verify all wiring connections, as there may be no fan operation signal. Loose wiring can also cause this issue, so check all wiring connections at the motor and control box, ensuring that power and control harnesses are securely connected. Interface board problems could also be the cause; make sure the interface board isn't damaged and that all DIP switches are in the proper configuration. Finally, a faulty motor could be the problem; check the supply voltage to the motor and ensure all motor wires are secure.
J
Jerry BoothSep 4, 2025
How to fix excessively cold air from Bosch Heat Pump in cooling?
- R
  Richard BeckerSep 4, 2025
  If your Bosch Heat Pump is producing excessively cold air during cooling or excessively hot air during heating, it could be due to reduced airflow. Try replacing the filter. The fan speed might be too low, so consult the blower performance table and increase fan speed if possible. Also, excessive duct pressure drop can cause this issue; consult the blower performance table and increase fan speed if possible.
L
Laura PowellSep 3, 2025
Why is my Bosch Greensource CDi Heat Pump blowing warm air in cooling mode?
- B
  Bernard GomezSep 3, 2025
  If your Bosch Heat Pump is providing excessively warm air in cooling or excessively cool air in heating, several factors could be responsible. The airflow might be too high; consult the blower performance table and reduce fan speed if possible. High or low water temperature could also be a cause; check the unit's capacity versus the water temperature. Air leakage in the ductwork can also lead to this issue, so inspect the ductwork. Finally, a loss of refrigeration capacity could be the reason; in that case, check refrigerant pressures with a gauge set.
M
Matthew FletcherSep 2, 2025
Why is there high humidity with my Bosch Heat Pump?
- L
  Laura HenrySep 2, 2025
  High humidity with your Bosch Heat Pump can stem from several causes. The airflow might be too high, so you may consult the blower performance table and reduce fan speed if possible. Another reason could be a loss of refrigeration capacity, in which case you should check refrigerant pressures with a gauge set. Short cycling could also contribute, so check the unit's performance against building load calculations. Finally, ensure that the thermostat isn't located near a supply air duct, as a poor thermostat location can affect humidity levels.
C
Courtney BoyerSep 2, 2025
Why is my Bosch Heat Pump fan running but the compressor isn't?
- M
  Mathew GordonSep 2, 2025
  If your Bosch Heat Pump's fan runs but the compressor doesn't, it could be due to a high-pressure fault caused by no or low water flow. Check the water valves and/or pumps for proper operation and inspect for any water coil blockages. It might also be due to high water temperature; ensure it is within the correct range. A fouled or scaled water coil could also be the culprit; check for proper flow rate and water temperature. Also, check the fan motor for proper operation. Alternatively, a low-pressure fault due to low refrigerant could be the cause; in this case, check the refrigerant pressure with a gauge set. If it is a freeze fault, it may be caused by low water temperature. Check if the water temperature is below 40° entering.
A
awoodSep 1, 2025
Why is my Bosch Greensource CDi Heat Pump not heating or cooling sufficiently?
- R
  Rachel LeeSep 1, 2025
  If your Bosch Heat Pump isn't providing enough cooling or heating, start by recalculating the heating and cooling loads of your space; adding insulation and shading might help. Check for leaks in ductwork or ambient air entering through doors and windows. Ensure adequate airflow and proper air distribution, replacing dirty filters if needed. A low refrigerant charge could also be the cause. Check the compressor for defects. Also, compare unit operation pressures to the pressure/temperature chart for the unit. Check TXV for possible restriction or defect. The refrigerant system may be contaminated with moisture or noncondensables. Reclaim refrigerant, replace filter dryer, evacuate the refrigerant system, and recharge with factory recommended charge.
C
Christine EspinozaAug 31, 2025
How to troubleshoot a Bosch Heat Pump that won't turn on?
- M
  Molly KentAug 31, 2025
  If your Bosch Heat Pump isn't running, first ensure the power supply is on and the disconnect is closed. Check for blown fuses and replace them or reset the circuit breaker, ensuring you use the correct fuses. Verify that the voltage supply meets the minimum specified on the unit's data plate; if it's too low, contact your local power company. Also, check the thermostat settings and wiring, setting the fan to 'ON'.
J
Jeremy WebsterAug 28, 2025
Why does my Bosch Greensource CDi Heat Pump unit shut off on low pressure control?
- B
  Brad JohnsonAug 29, 2025
  If your Bosch Heat Pump shuts off due to low pressure control, it could be caused by several factors. In cooling mode, this may be due to a lack of or inadequate air flow, entering air temperature being too cold, an inoperative blower, a clogged filter, or restrictions in the duct work. In heating mode, it may be due to a lack of or inadequate water flow, entering water temperature being too cold, or a scaled or plugged condenser. Also, the unit could be low on refrigerant, requiring you to check for a refrigerant leak, repair it, evacuate, and recharge with the factory-recommended charge. Finally, check for a defective or improperly calibrated low-pressure switch.
M
Michael SweeneyAug 25, 2025
What to do if my Bosch Greensource CDi compressor isn't working?
- P
  Patty LopezAug 26, 2025
  If the compressor on your Bosch Heat Pump isn't operating but the fan is running, it could be due to an open compressor overload. Check for supply voltage at the load side of the contactor. For 3-phase models, check the phase rotation and voltage at all 3 phases. Poor wiring connections can also cause this; look for signs of heat on the wiring insulation and ensure that all wiring connections are secure and properly torqued. A burned-out compressor is another possibility; check if the compressor hums when power is applied. If not, check the resistance of the compressor windings using the values shown in the compressor characteristics chart, ensuring the compressor is cool (70° F) when checking the windings.
G
Gregory RodriguezAug 25, 2025
Why is my Bosch Heat Pump not cooling or heating enough?
- M
  Michael Terry PhDAug 25, 2025
  There are several potential reasons why your Bosch Heat Pump might not be providing sufficient cooling or heating. It could be due to an undersized unit (in which case, recalculating heating and cooling loads and adding insulation or shading might help), loss of conditioned air through leaks in ductwork or around doors/windows, inadequate airflow (check and replace the filter if dirty), low refrigerant charge, a defective compressor or reversing valve, operating pressures that don't match the unit's pressure/temperature chart, a restricted or defective TXV, or contamination of the refrigerant system with moisture or noncondensables (in which case you need to reclaim refrigerant, replace the filter dryer, evacuate the system, and recharge with the recommended charge).

Bosch Greensource CDi Series Specifications

General

Brand	Bosch
Model	Greensource CDi Series
Category	Heat Pump
Language	English

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