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R is the hot side while C is the common side of the transformer. Maybe I can't use the aquastat transformer because it seems that connecting the R & W lwco wires to T-T would, in effect, complete the circuit & trip the relay to run the boiler & circulator. The two 24 volt wires can NEVER touch or the transformer will short and need to be replaced. minimum wire, copper or … With a separate 24 VAC power supply, wiring the Normally Closed lwco switch yellow wires in series with the thermostat makes perfect sense. In this really short video you will learn how to connect an unused wire so it can be used as your C wire, which in a lot of cases has solved the problem of a thermostat not working. 24 c com n/o n/c n/c n/o 3 6 5 to: tt on boiler sr501 1 zone switching relay power t stat typical wiring (cold start) t ac power tor r w t t 24 c com n/o n/c n/c n/o 3 6 5 to: tt on boiler sr501 1 zone switching relay power * t stat * alternative wiring (24 vac powered input signal) h n remove jumper. • Wire the circulator and connect wires and conduit through 1/2" K.O. provide disconnect means and overload protection as required. So you’ve decided to install your new thermostat and discover that you have an unused wire but you do need a C wire connection. wired the 120v power to the fan to a service switch close by, then thru an aquastat either strap on or well type (like a Honeywell L6006C1018) on the outlet or return out of the coil. Use 75°C. 3 Disconnect wire leads from the power supply. Even though a red wire is supposed to go to R and a black wire to C the colors of the wires can sometimes differ. page 7: l8124l multizone system A wiring diagram is a streamlined conventional photographic depiction of an electrical circuit. Note: Lead Wiring Specification - Minimum, 6" (152 mm) long, 14 awg, rated minimum 140°f (60°c). 1)Connect a “C” wire 2)Connect a 220-ohm 5w resistor on the furnace between “C”&”Y”(or”W” if you have a heat only system) Using a “C” wire is the best fix, it gives the nest a dedicated wire for 1/2 of the power and has access to full power at all times system running or not, and it doesnt have to power steal. do not connect power to n and h terminals. l8124a,c,e,l and m aquastat® relays t87f t87f t87f r845 relay r845 relay r845 relay (hot) pump pump pump low voltage gas valve c1 c2 (eg, vr8300) l8124e aquastat ® relay power supply. 4 Connect power supply wires (black, white and green) to the timer unit and to the circulator terminals (as shown in fig.2). provided on bottom left hand corner, to the ter-minal board marked, "Circulator". The aquastat … Here's what I said in the other thread: The easiest way is to wire it direct. The aquastat monitors the water temperature in the boiler through the use of a copper bulb that stays in contact with the water inside the boiler and that shuts down the boiler automatically if the low- … 2 Line wires,( 1 each for the circulators) 1 Line wire for the service switch, (which leads to the water cut off H terminal), and 1 red wire, ( which leads to the W terminal (LOW SIDE) of the aquastat). The other wires going through the junction box are as follows. Unused C Wire Terminal. Wire zone valve trans-former to terminals "A" and "B" of this terminal board (see Figure 6) if zone valves are used. The tstat opens the zone valve which allows hot water to flow thru the coil, as the aquastat heats up the fan turns on. The common wire, sometimes referred to as the c-wire, is what’s responsible for delivering constant power to your thermostat. The aquastat on a hot water boiler is essentially a combination heating control. There are 4 wires coming out of the junction box. 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