ESCO Air Conditioning Practice Exam

When should a drain trap be installed on a split system?

1. When the air handler drain is on the negative air side

2. When the condenser is located above the air handler

3. When the air handler is on the positive air side

4. When installing a heat pump

The correct answer is: When the air handler drain is on the negative air side

A drain trap should be installed on a split system when the air handler drain is on the negative air side. This is because installing a drain trap in this specific configuration helps prevent air from being pulled into the system through the drain line. It ensures proper drainage of condensate without any air leakage into the system, making it the correct choice. In contrast, the other options do not address the specific condition where a drain trap is required for effective operation in a split system setup.