Models with Motorized Modulation: H2, H6, W2
Sizes
HIGH LIMIT AND | TEMP CONTROL |
TEMP CONTROL | FOR MOTORIZED MODULATION |
LIMIT CONTROLS
1. HIGH LIMIT
If boiler is equipped with a manual reset High Limit, push the reset button and set the Limit(s) to 30° - 40°F above operating temperature.
2.FLOW SWITCH
Dual purpose control shuts off boiler in case of
pump failure or low water condition.
3. 100% PILOT SAFETY
All standard boilers above 400,000 BTUH input are equipped with pilot safety(ies), which close the main valve within 8/10 of a second whenever the pilot flame is interrupted. Pilot flame is automatically lit when the device is powered. Unit performs its own safety check and opens the main valve only after the pilot is proven to be lit.
4. LOW WATER CUTOFF
The low water cut off automatically shuts down burner whenever water level drops below probe. 90 second time delay prevents premature lockout due to temporary conditions such as power failure or air pock-
ets.
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5. HIGH AND LOW GAS PRESSURE SWITCHES These switches sense either high or low gas pres- sures and automatically shut down burners if abnormal
pressures exist.
6.BLOCKED VENT SHUT-OFF SYSTEM
All indoor boilers below 300,000 BTUH input em-
ploy a blocked vent
In the event the blocked vent
7.FLAME ROLL-OUT
SAFETY SHUT-OFF SYSTEM
All boilers below 300,000 BTUH input employ a flame
In the event the flame
3 | 4 | 5 |
MANUAL RESET | FLOW SWITCH | PILOT SAFETY | LOW WATER | HIGH OR LOW GAS |
HI LIMIT
Fig # 9314 | Fig # 9317 |
CUTOFF | PRESSURE SWITCH |
Fig # 8929 | Fig # 9316 | Fig # 9312 |
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