►System Applications
Standing Pilot
Gas flow to the pilot burner is controlled by a safety valve which is manually operated and held in by current generated from a thermocouple placed in the pilot flame. When the thermostat calls for heat the main valve is energized.
Electrical Cut Out (E.C.O.) Switch or
Supplementary Limit in appliance
ECO Terminals (2) | Power Unit |
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Jumper
NOTE: If appliance does not | ON |
have E.C.O. Switch |
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or supplementary limit, | OFF |
jumper E.C.O. terminals |
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TH,
TH | TR |
TH TR |
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PILOT | |
ADJ. |
W | R | 24 VAC | Line | Hot |
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Thermostat | Transformer |
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Wiring for 36C03 (24 VAC) with E.C.O.
Proven Pilot
The thermostat calls for heat and simultaneously energizes the pilot valve and the Proven Pilot control. Sparking from the ignition electrode to the pilot burner ignites the gas at the pilot burner. Flame is sensed by the flame detection circuit which energizes the main valve. Main burner gas is ignited and sparking ceases once a pilot flame is detected.
HOT | LINE VOLTAGE | NEUTRAL |
LIMIT120 VAC
| W |
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| COMMON (“C”) |
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| THERMOSTAT |
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| 25 VAC |
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| H.V. LEAD |
T | P | M | M | P | T | G | F | IGNITION |
N | ||||||||
H | V | V | V | V | R | D | P | ELECTRODE |
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| (PILOT) |
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| C |
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| P |
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| SENSE |
LINE VOLTAGE |
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| M |
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| ELECTRODE | ||
LOW VOLTAGE |
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Typical Wiring for Proven/Intermittent Pilot System
Gas Valve Cross Reference 9