Dayton low voltage NG heater

[sardean]

I bought a natural gas heater at an auction and it is hung and the gas is connected but I am having problems understanding where the 6th wire goes.
I've got hot, neutral and ground figured out. So that leaves 2 wires for the thermostat and a spare. I found a schematic at Granger and it says to connect the 2 pink wires to go to one side of the thermostat. I thought it was all ready to go and got clicking (assuming it was trying to fire up the pilot) but it never turned on. I even got a spark in the thermostat when I slid it to a higher temp to turn on. Any suggestions before I pay an HVAC company to solve my problem?

 

[nehog]

Uh, model number? Likely it is a wire for fan (auto and on) and a wire for heat command plus a common (hot) wire for both. Without a model number its hard. BTW, Grainger will (probably) email you a PDF of the entire manual.

Is there a 'light' for status (most do) and what is that light doing? Flashing, fast or slow, steady on, steady off, or what?

The thermostat terminals should be marked with letters such as W, R, G, W1, W2, etc. so see if that is so. Two pink wires don't match any standard that I know of for thermostats!

Maybe also post that schematic--maybe someone here can make heads or tails of it?