What to do if my Bosch LV compressor isn't running and the fan is on, but I suspect low refrigerant?
If your Bosch Heat Pump's compressor isn't running but the fan is, it could be due to a low-pressure fault caused by low refrigerant. Check the refrigerant pressure with a gauge set.
What to do if the compressor of my Bosch LV doesn't work but the fan runs and there is a freeze fault?
If your Bosch Heat Pump's compressor isn't running but the fan is, it could be due to a freeze fault in the water coil caused by no or low water flow. Check the water valves and/or pumps to ensure they are operating correctly. Also, check the water coil for any blockages.
Why is my Bosch LV compressor not running but the fan is, possibly due to high water temperature?
If your Bosch Heat Pump's compressor isn't running but the fan is, it could be due to a high-pressure fault caused by high water temperature. Check the water temperature to ensure it is within the appropriate range.
How to troubleshoot a Bosch LV Heat Pump with no compressor operation but running fan, possibly due to a fouled water coil?
If your Bosch Heat Pump's compressor isn't running but the fan is, it could be due to a high-pressure fault caused by a fouled or scaled water coil. Check for proper flow rate and water temperature, especially looking for a low water side temperature rise during cooling.
What to do if my Bosch LV compressor isn't running but the fan is, and I suspect airflow issues?
If your Bosch Heat Pump's compressor isn't running but the fan is, it could be due to a high-pressure fault caused by no or low airflow. Check the fan motor to ensure it is operating correctly.
Why is my Bosch LV Heat Pump compressor not running but the fan is, possibly due to low airflow?
If your Bosch Heat Pump's compressor isn't running but the fan is, it could be due to a low-pressure fault caused by no or low airflow. Check the fan motor to ensure it is operating correctly.
What to do if my Bosch LV Heat Pump compressor isn't running but the fan is on and I suspect an overloaded control circuit?
If the compressor of your Bosch Heat Pump is not working, but the fan is running, it might be due to a brown-out fault caused by an overloaded control circuit. Check the control voltage; if it's below 18V, inspect the accessories connected to the unit and ensure they don't exceed the VA draw.
How to troubleshoot a Bosch LV with no compressor operation but running fan, possibly due to a bad thermostat connection?
If the compressor of your Bosch Heat Pump is not working, but the fan is running, it might be due to a brown-out fault caused by a bad thermostat connection. Check that the thermostat wiring is of the proper gauge and length, is undamaged, and that all connections at the thermostat and heat pump are secure.
What to do if the compressor of my Bosch Heat Pump doesn't work but the fan runs and there is a freeze fault caused by low refrigerant?
If your Bosch Heat Pump's compressor isn't running but the fan is, it could be due to a freeze fault in the air coil caused by low refrigerant. Check the refrigerant pressure with a gauge set.
Why is my Bosch LV Heat Pump compressor not running, but the fan is, possibly due to condensate drainage issues?
If your Bosch Heat Pump's compressor isn't running but the fan is, it could be due to a condensate fault caused by poor drainage. Check the condensate pan for a high water level. Check the drain line for blockages, double trapping, or inadequate trapping.
Instructions for safely moving and storing the heat pump units.
Information on fold-out duct flanges for easier installation and handling.
Explanation of the ECM interface board, thermostat connections, and indicator LEDs.
How the HGRH switch selects operating modes for reheat coils or cool-to-dehumidify.
Identification and explanation of UPM safety features and connection points.
How the unit operates in cooling and heating modes based on thermostat signals.
Description of the extended range option for extreme fluid temperatures.
Guidelines for maintaining water loop temperatures for cooling tower/boiler systems.
Table showing AHRI ratings for LV series heat pumps with PSC and ECM motors.
Details on the standard PSC motor and how to change fan speeds.
Electrical data for standard blower motors.
Section for recording customer information.
Fields to record unit make, model, and serial number.
Data fields for recording operating parameters in cooling and heating modes.
Fields for auxiliary heat unit data.
Table listing problems, modes, checks, causes, and actions for troubleshooting.
Table showing operating data (temperatures and pressures) for cooling and heating.
Wiring diagram for single phase PSC motor base unit (Fig #14).
Wiring diagram for three phase PSC motor base unit (Fig #15).
Wiring diagram for single phase constant torque ECM motor base unit (Fig #16).
Wiring diagram for single phase constant airflow ECM fan motor base unit (Fig #17).
Wiring diagram for three phase PSC motor base unit (Fig #18).
Wiring diagram for single phase unit with waterside economizer (Fig #19).
Wiring diagram for three phase constant airflow ECM fan motor base unit (Fig #20).
Table showing dimensional data for vertical unit configurations.
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