Bob and Tim were at a retail store where the manager had called and said there was no cooling. The system was a 5-ton heat pump. After talking to the manager, Bob and Tim turned the thermostat to the “fan on” position to see if there was power to the unit and the indoor fan started. The heat pump was a split system, so they went up to the roof.
A new customer called and wanted their commercial unit serviced. The customer was a retail store and the manager seemed to think that the unit was not performing up to standard. The unit would run most of the time, even in mild weather, and did not seem to cool the store as well as it should.
Bob and Tim were at a no cooling call, the first of the year. They turned the thermostat to cooling and put it on a low setting so the heat pump would come on and stay on. They went to the outdoor unit and felt the leaving air and the piping and Tim said, “The unit is running in the heating mode. I wonder what is going on?”
Bob and Tim were on their way to a service call at a store that has a frozen heat pump outdoor unit. It is late in the season and the customer called and said, “Our outdoor unit is frozen solid with ice.” After they arrived and talked to the owner, Bob said, “Let’s put the unit through a forced defrost.”
Bob and Tim were on their way to a no heat call for a gas furnace. Tim asked, “What do you think we need to look out for on this call?” Bob said, “It could be any number of things. We will start by talking to the homeowner and see what she knows.”
Bob and Tim were on their way to a service call on a heat pump. The homeowners are complaining about noise at the outdoor unit. When Bob and Tim arrived, the homeowners explained that the heat pump for upstairs is beside the house in a wooded area. It is under their upstairs bedroom window and it became loud last night.
Bob and Tim were on their way to a service call where the customer is complaining about a high power bill. She said the heat pump that they use for their heat is running all the time and their power bill is really high.
Bob and Tim were on their way to do routine annual service on a customer’s gas furnace and humidifier. Tim asked, “What are the things that we should look for that may cause problems on a gas furnace?”
Bob and Tim were at the shop after a day of service calls. The weather was still hot, 93°F, and Bob said, “We just did a service call with a system that was overcharged and had an orifice expansion device. I would like to go into further details with you on a system with a thermostatic expansion valve (TXV) for an expansion device.”