Taco zone valves

Paul Fredricks_9

I know the Taco heat motor zone valves draw more amps than a Honeywell zone valve, and that you need to resistor with the T87 replacement thermostat, but what about the Honeywell Pro 5000 stats? Do you still need the resistor?

Joe Mattiello

A good rule of thumb; if the thermostat requires a constant 24 volts, then you need to use the resistor typically supplied with the thermostat. If no resistor was supplied; contact the thermostat mfg for the appropriate ohms resistor that will allow enough voltage to trickle through. Incidentally, the resistor is required because of the inherent intermitting heat motor on the Taco 570 series, and not because of the amp load.