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3535
3535
35
FIGURE 30
ONE HW-300, HW-399, HW-420, HW-520, HW-610 OR ONE HW-670 UP-FLOW MODEL
COMMERCIAL BOILER WITH HORIZONTAL TANK
WIRING - FIGURES 17, 18, 19
INSTALL IN ACCORDANCE
WITH ALL LOCAL CODES
IMPORTANT
THE INSTALLATION OF SAFETY FLOW SWITCH AS SHOWN IS
REQUIRED TO PROTECT THE BOILER IN CASE OF WATER
SERVICE INTERRUPTION OR CIRCULATOR FAILURE
(A.O. SMITH PKG. NO. 211480).
+ 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.
USE THIS TABLE FOR CORRECT
PUMP AND WATER PIPE SIZE
Minimum B & G *Armstrong
Model Pipe Size Pump Pump
Number (Inches) Size Size
HW-300 1-1/4" 125 S-25 1-1/4"
HW-399 1-1/2" 1-1/2" HV H-32 1-1/2"
HW-420 1-1/2" 1-1/2" HV H-32 1-1/2"
HW-520 1-1/2" 1-1/2" HV H-32 1-1/2"
HW-610/670 2" 2" S-35
*Assumes 50 equivalent feet pf piping or less.
DANGER
TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE
TEMPERATURE AT FIXTURES. SEE TANK TEMPERATURE
CONTROL WARNING ON PAGE 32. IF HIGHER PREHEAT
TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE
BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT
WATER SUPPLIED TO FIXTURES.