A.O. Smith HW 610 THREE HW-520s, HW-610s OR HW-670s UP-FLOW MODEL, Model, Pipe Size, Armstrong

THREE HW-520's, HW-610's OR HW-670's UP-FLOW MODEL

COMMERCIAL BOILER WITH VERTICAL TANK, CER-TEMP 80

WIRING - FIGURES 21 to 27 on

pages 28 to 32.

INSTALL IN ACCORDANCE

WITH ALL LOCAL CODES

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.

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.

USE THIS TABLE FOR CORRECT

PUMP AND WATER PIPE SIZE

	Minimum		B & G
Model	Pipe Size			*Armstrong
Number	(Inches)		Pump	Pump Size
			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.

FIGURE 32.

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