Question

You are starting-up a split system heat pump for the first time. The outdoor ambient temperature is 60°F. You check the temperature split across the indoor coil in the heat mode and find it is 38°F. You switch to the cooling mode and determine a temperature split of 29°F. The most likely corrective action (relative to air flow) is _________.

1) Check the air filter for blockage
2) Check the blower motor for proper operation
3) Check the refrigerant charge
4) Check the expansion valve for proper operation

Answer 1

The corrective action for abnormal temperature splits in a heat pump system is likely checking the air filter for blockage to ensure proper airflow across the coil.

Step-by-step explanation:

When starting-up a split system heat pump for the first time and observing a temperature split of 38°F in the heat mode, and 29°F in cooling mode with an outdoor ambient temperature of 60°F, the most likely corrective action (relative to air flow) is to check the air filter for blockage. This step is important because a blocked air filter can significantly reduce airflow, which can cause high temperature splits because not enough air is moving across the coil to pick up the heat in heating mode or remove the heat in cooling mode.

Answer 2

The likely corrective action would be to check the air filter for blockage. Insufficient air flow due to a clogged filter could cause the temperature splits observed. It's a common issue that affects both heating and cooling efficiency. The correct multiple-choice option is (1).

Step-by-step explanation:

When starting up a split system heat pump for the first time and finding temperature splits of 38°F in heat mode and 29°F in cooling mode at an outdoor ambient temperature of 60°F, the most likely corrective action relative to air flow would be to check the air filter for blockage. A blocked air filter can restrict airflow, causing inadequate temperature splits due to insufficient air passing over the coils, affecting both heating and cooling performance. Monitoring the temperature split is a crucial step in ensuring that the unit operates efficiently and provides the intended temperature control within the space.

Other potential actions include checking the blower motor for proper operation, which ensures that the air is being circulated effectively through the system, and checking the expansion valve for proper operation, which is crucial for regulating refrigerant flow and ensuring optimal heat transfer. However, the most common and first step should be ensuring that the filter is clean and unblocked. Checking the refrigerant charge is another important step, but it is more closely related to the thermodynamics of the system rather than air flow. The correct multiple-choice option is (1).