A.O. Smith 404 - Manual (Page 20)

20
ONE GENESIS (MODEL GW) HOT WATER SUPPLY BOILER WITH VERTICAL TANK
Figure 13. Single boiler with vertical tank.
PRESSURE RELIEF VALVE RATING SHOULD NOT EXCEED PRESSURE CAPACITY OF ANY COMPONENT IN THE SYSTEM.
PIPING SHOULD CONFORM TO LOCAL CODES.
BALL VALVES ARE SHOWN FOR SERVICING BOILER. HOWEVER, LOCAL CODES SHALL GOVERN THEIR USAGE.
IMPORTANT
WATER FLOW SWITCH PROTECTS THE BOILER IN CASE OF WATER SERVICE INTERRUPTION OR CIRCULATOR FAILURE.
• PIPE TO OPEN DRAIN
X FACTORY INSTALLED ON UNIT
== SUPPLIED WITH UNIT
=
FIELD-INSTALLED
DANGER
TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE
TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE
CONTROL WARNING ON PAGE 26. IF HIGHER PREHEAT TEM-
PERATURES ARE NECESSARY TO OBTAIN ADEQUATE
BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT
WATER SUPPLIED TO FIXTURES.
INSTALL THERMAL EXPANSION
TANK ON COLD WATER SUPPLY
LINE, IF CHECK VALVE OR
PRESSURE REDUCING VALVE
IS USED IN SUPPLY.
FACTORY PUMP SIZING BASED
ON 50 EQUIVALENT FEET
(15.2 m) OF PIPE.
MINIMUM
PIPE SIZE
MODELS INCHES
GW-1000
THRU 2 1/2"
2500 NPT
MODELS
CIRCULATING RETURN
LINE CONNECTIONS
• TEMPERED WATER LOOP, IF USED,
CONNECT TO POINT R.
• STORED TEMPERATURE WATER LOOP,
IF USED, CONNECT TO ANY OPENING
NEAR BOTTOM OF TANK.
TWO TEMPERATURE WATER
MIXING VALVE APPLICATION