A.O. Smith HW 610 User Manual
36
FIGURE 31.
TWO HW-300's, HW-399's, HW-420's, HW-520's, HW-610's OR HW-670's UP-FLOW MODEL
COMMERCIAL BOILER WITH HORIZONTAL TANK
IMPORTANT
THE INSTALLATION OF SAFETY FLOW SWITCH AS SHOWN
IS REQUIRED TO PROTECT THE BOILER IN CASE OF WATER
SERVICE INTERRUPTION OR CIRCULATOR FAILURE.
+ PIPING AND FITTINGS BETWEEN GATE VALVES AND
BOILERS SHOULD BE BRASS OR BRONZE. OTHER
PIPING SHOULD CONFORM TO LOCAL CODES.
GATE VALVES ARE SHOWN FOR SERVICING BOILER.
HOWEVER, LOCAL CODES SHALL GOVERN THEIR USAGE.
HOWEVER, LOCAL CODES SHALL GOVERN THEIR USAGE.
* PRESSURE RELIEF VALVE RATING SHOULD NOT
EXCEED PRESSURE CAPACITY OF ANY COMPONENT
IN THE SYSTEM.
** INSTALL THERMOMETER AND PRESSURE RELIEF IN
OPENINGS PROVIDED ON HW-520, HW-610 & HW-670.
DANGER
TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE TEMPERATURE AT
FIXTURES. SEE TANK TEMPERATURE CONTROL WARNING ON PAGE 11. IF HIGHER
PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER
OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES.
WIRING - FIGURES 21 to 27 on
pages 28 to 32.
INSTALL IN ACCORDANCE
WITH ALL LOCAL CODES
USE THIS TABLE FOR CORRECT
PUMP AND WATER PIPE SIZE
Model
Number
Minimum
Pipe Size
(Inches)
B & G
Pump
Size
*Armstrong
Pump Size
A
B
HW-300
2"
1-1/2"
2"
S-35
HW-399
2"
1-1/2"
2"
S-35
HW-420
2"
1-1/2"
2"
S-35
HW-520
2"
1-1/2"
2"
S-35
HW-610/670
2-1/2"
1-1/2"
2-1/2"
S-45 2-1/2"
* Assumes 50 equivalent feet of piping or less.