Raypak 0133-4001 WH, NH manual Limit Controls High Limit, Flow Switch, 100% PILOT SAFETY

Fig # 9332

MECHANICAL MODULATING VALVE LOCATION

MODELS 0724-1336

MOTORIZED GAS VALVE LOCATION

MODEL 3001

Fig # 9333.1

LIMIT CONTROLS

HIGH LIMIT

The heater is equipped with a manual reset High Limit. Push the reset button and set the limit(s) to

30 °F - 40 °F above desired operating temperature. Maximum setting is 210 °F.

FLOW SWITCH

This dual-purpose control shuts off the heater in case of pump failure or low water condition and is strongly recommended. It is mounted and wired in series to the main gas valve.

NOTE: The flow switch is a safety device and not a control. Do not operate the heater with flows less than the minimums stated in this manual.

100% PILOT SAFETY

Models 514-4001 employ electronic devices which close the main gas 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.

LOW WATER CUT-OFF (OPTIONAL)

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 pockets. Flush float type devices at beginning of each heating season.

HIGH AND LOW GAS PRESSURE SWITCHES (OPTIONAL)

These switches sense either high or low gas pres- sures and automatically shut down burners if abnormal pressures exist.

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