Published at Monday, March 25th, 2019 - 20:46:26 PM. wiring. By Lacene Andre.
Hot water systems are used mostly in the Northeast. They are very versatile, and can be used to economically zone different parts of a building. As with the steam boiler and hot air furnace, these systems also have a flue damper, spill switch, and rollout switch. We are going to discuss a forced hot water system, meaning that there is a pump to circulate the water in the system. Most package boilers come with a combination aquastat/circulator relay control; 120 V is brought into the control to terminals L1 and L2. The thermostat is brought to terminals T1 and T2, the circulator is connected to terminals C1 and C2, and terminals B1 and B2 power the gas valve. When the thermostat calls for heat, it closes terminals T1 and T2.
A common problem. Using a Varitone or Varitone variation means switching capacitance. Depending on the switch’s design and its location in the circuit, this can result in a loud popping noise in a passive guitar wiring scheme if you switch capacitors. You can prevent this by turning down your guitar’s volume pot or putting your amp on standby, but what if you want to use the rotary switch mid-song? There’s an easy solution: Get some 10M resistors. (I like 1/4-watt metal-film resistors because of their small size, but you can use any resistor type or voltage you want, so long as it has the correct resistance.) Solder one between the rotary switch’s center input lug (labeled “Center lug connects to volume pot lug 3” in Joe’s diagram) and the lug the capacitor is connected to. You need to use a separate resistor for each capacitor, which means a total of three resistors if you follow Joe’s diagram.
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