Published at Monday, March 25th, 2019 - 10:56:58 AM. wiring. By Laverne Gerard.
The next control is the pressure control. The pressure control is a switch that, when working as a high-limit safety, opens on pressure rise. The switch can be either a micro switch or a mercury switch. The pressure control is wired in series with the LWCO, the rollout switch, and the spill switch. There are a few things to remember about pressure controls. First, the cut-out pressure should never be set higher than 2 psi. This is plenty of pressure for most residential one-pipe gravity systems. Higher pressures are inviting problems.
It is also a problem for manufacturers when misunderstood equipment is returned under warranty with no defect, as well as for homeowners when they don’t get the performance they expect. ”A lot of manufacturers still have a big metal box and one terminal strip with 17, 18, or even 19 wires,” Porter said. His dual-fuel control has three strips – one for the furnace, one for the outdoor unit, and one for the indoor thermostat – and the wires are clearly identified, he said.
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