Raypak RAYTHERM 0133-4001 - Manual (Page 22)

rupted. 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
These switches sense either high or low gas pres-
sures and automatically shut down burners if abnormal
pressures exist.
LIMIT CONTROLS
HIGH LIMIT
The boiler is equipped with a manual reset high
limit. Push the reset button and set the limit(s) to 30-
40 °F above desired operating temperature.
FLOW SWITCH
This dual purpose control shuts off the boiler in the
case of a pump failure or low water condition. It is
mounted and wired in series to the main gas valve.
Standard on all models except the 133.
NOTE: Flow switch will not operate if flow is less than
12 GPM.
100% PILOT SAFETY
All standard boiler models 514-4001 employ elec-
tronic devices which close the main gas valve within
8/10 of a second whenever the pilot flame is inter-
MANUAL RESET HIGH LIMIT FLOW SWITCH
MODULATING VALVE LOCATION
Fig. #8643
THERMOSTAT CONTROL
Fig. #8644 Fig. 9317
22
MODULATING VALVES
W/ BUILT-IN REGULATOR