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Do not use low voltage (24V) thermostats. Check the table below for the appropriate gauge thermostat wire to use for the length of lead required in your installation. Thermostat Wire / Gauge 18 20 22 Maximum Run 40 feet 25 feet 16 feet 1. Install the wall thermostat in the desired location and run the wires to the stove location. Terminate these leads with 1/4” female connectors. 2. Connect the thermostat wires to the valve. (Fig. 18) Vermont Castings Jefferson Vent Free Gas Heater Operation Your First Fire Piezo Ignitor Read these instructions carefully and familiarize yourself with the burner controls of this heater. The JUVSR uses a Honeywell control valve that allows thermostatic, on/off switch regulation and has a separate Piezo ignition button. (Fig. 19 or 20) The JUVSM is equipped with an SIT control valve for manual use only. Locate the Pilot assembly to the right behind the PILO T ST573 burner. (Fig. 21) Follow the lighting instructions on page 14 exactly. Fig. 20 SIT control valve. For the first fire, allow the stove to operate continuously for six hours without using the fan. During the first fire, it is not unusual to smell some odor associated with new logs, paint and metal being heated. Odors should dissipate within a few hours or so, however, you can open a window to provide plenty of fresh air to alleviate this condition. Pilot and Burner Inspection Each time you light your heater, check that the pilot flame and burner flame pattern are as shown in Figures 23 and 24. If flame patterns are incorrect, turn the heater off. See Troubleshooting, page 16. Do not operate the heater until the pilot flame is correct. Follow regular maintenance procedures as described on page 15. PILOT ON OFF PILOTADJ LO HI Piezo Ignitor Gas Control Knob Regulator Control Knob HV104 TPTH TH TP ST232 Fig. 21 Pilot assembly location. Natural Pilot LP Pilot Fig. 19 Valve controls. Vermont Castings Jefferson Vent Free Gas Heater Thermopile* Pilot Orifice ST117a PILOTADJ Pilot Assembly ST115a Fig. 22 Pilot Assembly Location Fig. 24 Correct Pilot Flame. (*JUVSM pilots do not have ST116 Thermopile) Lifting Flame Fig. 23 Proper flame pattern with Regulator in HIGH Weak Flame position. ST118a Fig. 25 Examples of Incorrect Pilot Flame. Vermont Castings Jefferson Vent Free Gas Heater Lighting And Operating Instructions FOR YOUR SAFETY READ BEFORE LIGHTING • If you cannot reach your gas supplier, call the Fire Department C. Use only your hand to push in or turn the gas control knob. Never use tools. If the knob will not push in or turn by hand, do not try to repair it, call a qualified service technician. Applying force or any attempted repair may result in a fire or explosion. D. Do not use this fireplace if any part has been under water. Immediately call a qualified service technician to inspect the heater and to replace any part of the control system and any gas control which has been under water. A. This heater has a pilot which must be lit manually. When lighting ...

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