| Connection Type | Spade Terminals |
| Voltage | 750 mV; Open circuit output--600 mV to 750 mV |
| Application | Thermopile |
| Used With | Q314, Q324, Q327, Q377, Q379, Q382 Pilot Burners |
| Includes | 1/2 in. attaching nut, split nut, spade to quick connect adapte, push-in clip, PG9 adapter |
| Temperature Ratings (F) | Hot Junction--1400 F; Cold Junction--780 F |
| Resistance | 2.89 ohms |
| Length (in.) | 35 in. |
| Prop 65 Warning | WARNING/CA WARNING/CALIFORNIA WARNING: “Risk of cancer and reproductive harm from exposure to [Lead]. See www.P65Warnings.ca.gov.” |
Description
The Q313U3000 is a 750 mV thermopile from Resideo (Honeywell Home).
A thermopile is a stack of thermocouples wired in series. Where a single thermocouple makes about 30 millivolts — just enough to hold a pilot safety valve open — a thermopile makes around 750, which is enough to run the whole control circuit.
That is what a millivolt system is: a gas appliance that needs no electrical supply at all. The pilot flame generates the power, the thermostat switches it, and the gas valve opens. The appliance keeps working through a power cut, which is why millivolt controls are still specified on fireplaces, wall heaters and standing-pilot unit heaters.
A thermopile that has aged puts out less voltage before it puts out none. The symptom is an appliance that lights and runs but drops out when the thermostat calls, or one that will not restart once it has cooled — the output is enough to hold the pilot but not enough to pull in the main valve.
The multi-system version covers a range of appliances from one part number, which is what makes it worth carrying rather than ordering per job.
Thermopiles power the control circuit, so they pair with millivolt thermostats such as the T827K1009.
- Brand: Resideo (Honeywell Home)
- Manufacturer Part #: Q313U3000/U
- Type: Thermopile
- Output: 750 mV
- Universal: Yes
- UPC: 085267516815
- Category: Thermocouples & Thermopiles