Published at Tuesday, March 26th, 2019 - 08:12:27 AM. wiring. By Karla Regnier.
Bob and Tim are at a job where a technician from another company could not figure out the electrical, so he just put the panel back on the electrical compartment and left the job. It is a heat pump and the compressor wiring is all loose. They need to figure out how to wire it back and find out the problem. The homeowner said the original call to the other service company was because of ice build up on the outdoor coil. Bob and Tim talked to the homeowner and explained that because the weather was cold and damp, ice buildup was expected on any heat pump in this kind of weather, but they would check the unit and see what was going on. The heat pump compressor was not running and the home was being heated with the auxiliary heat, so the first order of business was to get the heat pump operating. They went outside and noticed the ice had melted from the outdoor unit due to an above freezing day. The compressor was not running; however, the fan was running.
One other way to wire multiple zones is with the use of zone valves. A zone valve is a motorized solenoid valve with an end switch. The thermostat for each zone is wired through a 24-V transformer to the zone valve. A mechanical end switch is wired to the thermostat terminals of the boiler operating controls. When choosing a transformer for zone valves, make sure that the VA (volt amps) rating of the transformer is sufficient to run the zone valves attached to it.
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