A.O. Smith Boiler HW 610 User Manual

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38
THREE HW-520's, HW-610's OR HW-670's UP-FLOW MODEL
COMMERCIAL BOILER WITH HORIZONTAL TANK, CER-TEMP 80
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.
* 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.
WIRING - FIGURES 21 to 27 on
pages 28 to 32.
HEATERS SPACED 24" APART
INSTALL IN ACCORDANCE
WITH ALL LOCAL CODES
FIGURE 33.
DANGER
TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE TEMPERATURE AT
FIXTURES. SEE TANK TEMPERATURE CONTROL WARNING. IF HIGHER PREHEAT
TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT,
ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES.
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-520 2-1/2" 1-1/2" 2" S-45 2-1/2"
HW-610/670 3" 1-1/2" 3" HD-3 S-46
* Assumes 50 equivalent feet of piping or less.

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