Bob and Btu Buddy get together for breakfast to discuss their last service call, which concerned a compressor that had liquid refrigerant flooding back to it. Bob had asked a couple of questions while they were leaving the job. Btu Buddy then proceeds to answer Bob’s questions.
This job is a three-story office building with an air handler on each floor with a refrigerant coil in each air handler. A 75-ton condensing unit serves the three 25-ton air coils. This is an old system that has still been doing a good job. The complaint is that the second floor unit is not holding the conditions that the thermostat is set for.
The day started with a call from the dispatcher who described a gas heat customer who had no heat. When Bob arrived, the first thing he noticed was that the furnace was cold. It had not been operating. At first, Bob thought that the thermostat was defective. Btu Buddy then arrived to clear up his confusion.
Bob and Btu Buddy have gotten together for coffee to discuss the previous service call and some of the questions about electric heating that came up. Btu Buddy said that they would talk about them one at a time, and probably other questions would come up.
A call has come in from a new customer that the system in a small office building is not heating properly. Bob finds the building has an electric heat furnace and, when he removes the panel, he is amazed at how many wires and terminals there are and starts to become confused. Btu Buddy arrives to assist him.
The day has been cold and damp, and Bob has been called to do a routine checkup on a heat pump in a condominium complex. Most of the units in the complex are frosted over, but the unit that he is to service has a very different frost pattern. Bob is trying to figure out what’s going on when Btu Buddy appears to help him.
Bob gets a service call where the owner says there is not enough heating at one end of an office building. With Btu Buddy's assistance, Bob checks the duct system and finds that a piece of duct liner is laying down in the duct blocking the airflow and he proceeds to correct the problem.
Their last service call is continued as Bob and Btu Buddy meet for lunch at the restaurant where the call occurred to discuss dew point. The duct through the dining room was dripping because the duct surface temperature was below the dew point temperature of the room and moisture formed on the duct surface.
Bob gets a call from the dispatcher that a new customer, a restaurant, has some ductwork in the dining room that has been sweating during the lunch hour for the last several days and dripping on the customers. It is about lunchtime so Bob goes to the restaurant to check it out. Btu Buddy helps in solving the problem.
This service call is for a routine checkup on an old 7½-ton unit using R-22. The call is going well until the owner mentions to Bob that the unit has actually never cooled well. Bob then proceeds to do a complete check of the system with Btu Buddy’s assistance.