A.O. Smith VB/VW-500 - Manual (Page 21)

21
DANGER
TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE
TEMPERATURE AT FIXTURES. IF HIGHER PREHEAT
TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE
BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT
WATER SUPPLIED TO FIXTURES, SEE TABLE 11.
ONE VF (MODEL VW) HOT WATER SUPPLY BOILER WITH VERTICAL TANK
FIGURE 14.
INSTALL THERMAL EXPANSION
TANK ON COLD WATER SUPPLY
LINE, IF CHECK VALVE OR
PRESSURE REDUCING VALVE IS
USED IN SUPPLY.
ONE VF (MODEL VW) HOT WATER SUPPLY BOILER WITH HORIZONTAL TANK
DANGER
TEMPERATURE SETTING SHOULD
NOT EXCEED SAFE USE TEMPERATURE
AT FIXTURES. IF HIGHER PREHEAT
TEMPERATURES ARE NECESSARY
TO OBTAIN ADEQUATE BOOSTER
OUTPUT, ADD AN ANTI-SCALD VALVE
FOR HOT WATER SUPPLIED TO
FIXTURES, SEE TABLE 11.
INSTALL THERMAL
EXPANSION TANK ON
COLD WATER SUPPLY
LINE, IF CHECK VALVE
OR PRESSURE
REDUCING VALVE IS
USED IN SUPPLY.
INSTALL IN ACCORDANCE WITH ALL LOCAL CODES.
PRESSURE RELIEF VALVE RATING SHOULD NOT EXCEED
PRESSURE CAPACITY OF ANY COMPONENT IN THE SYSTEM.
INSTALL TEMPERATURE, PRESSURE GAUGE AND PRESSURE
RELIEF AS CLOSE TO BOILER OUTLET AS POSSIBLE.
SHUTOFF VALVES SHOULD BE INSTALLED FOR SERVICING BOILER,
LOCAL CODES SHALL GOVERN THEIR USAGE.
SAFETY RELIEF VALVE SETTING SHOULD NOT EXCEED PRESSURE
RATING OF ANY COMPONENT IN THE SYSTEM.
STOP VALVES ARE SHOWN FOR SERVICING BOILER. HOWEVER,
LOCAL CODES SHALL GOVERN THEIR USAGE.
CAUTION: IF BUILDING COLD WATER SUPPLY HAS A BACKFLOW
PREVENTER CHECK VALVE OR WATER METER WITH CHECK VALVE,
PROVISIONS FOR THERMAL EXPANSION OF WATER IN THE HOT
WATER SYSTEM MUST BE PROVIDED.
FIGURE 15.