To adjust the flow rate setting:
1.Remove the flow switch cover.
2.For higher flow rate - turn the range adjusting screw clockwise.
3.For lower flow rate - turn the range adjusting screw counterclockwise.
CAUTION
The switch is factory set at approximately the minimum flow rate, see Table 3 on page 9. It must not be set lower than the factory setting as this may result in the switch failing to return at 'no flow' condition.
4.Replace flow switch cover. Where units are installed in multiples, each boiler must be individually protected by a safety flow switch.
CAUTION
Paddle must be trimmed at the dotted arc. It must not touch the pipe or have any restriction when installed.
FIGURE 6.
SAFETY RELIEF VALVES
Your local code authority may have other specific relief valve requirements not covered below.
WARNING
THE PURPOSE OF A SAFETY RELIEF VALVE IS TO AVOID EXCESSIVE PRESSURE OR TEMPERATURE INTO THE STEAM RANGE WHICH MAY CAUSE SCALDING AT FIXTURES, TANK EXPLOSION, SYSTEM OR BOILER DAMAGE.
TO AVOID SCALDING OR WATER DAMAGE A DRAIN LINE MUST BE CONNECTED TO A RELIEF VALVE TO DIRECT DISCHARGE TO A SAFE LOCATION. A DRAIN LINE MUST NOT BE REDUCED
FROM THE SIZE OF THE VALVE OUTLET AND IT MUST NOT CONTAIN ANY VALVES BETWEEN THE BOILER AND THE RELIEF VALVE OR THE RELIEF VALVE AND THE DRAIN EXIT. IN ADDITION, THERE SHOULD NOT BE ANY RESTRICTIONS IN A DRAIN LINE NOR SHOULD IT BE ROUTED THROUGH AREAS WHERE FREEZING CONDITIONS MIGHT OCCUR. DO NOT THREAD OR CAP THE DRAIN LINE EXIT. RESTRICTING OR BLOCKING A DRAIN LINE WILL DEFEAT THE PURPOSE OF THE RELIEF VALVE AND MAY CREATE AN UNSAFE CONDITION. INSTALLA DRAIN LINE WITH A DOWNWARD SLOPE SUCH THAT IT NATURALLY DRAINS ITSELF.
If any safety relief valve is replaced, the replacement valve must comply with the current editions of the ASME Boiler and Pressure Vessel
10
