A.O. Smith Linear Temp System HW Technical Documents

A.O. Smith Water Heater Technical Documents - Linear Temp System HW.
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Revised June 1998

         

E 117.0

20°
30°
40°
20°
30°
40°

20°
30°

20°
30°
40°
20°
30°
40°
20°
30°
40°
20°
30°
35°
40°

Boiler

Temp. Secondary Boiler Pump

Boiler

Model

Rise

    Piping

  Selection

Inlet & Outlet

APPLICATION TYPE DIAGRAM

SEE INSTALLATION MANUAL FOR

COMPLETE INSTRUCTIONS

INSTALL IN ACCORDANCE WITH LOCAL CODES.

LINEAR-TEMP* SYSTEM

300-2, 399-2, 420-2, 520-2 OR 670-2

2"
2"

SH-1

60-13

2-1/2"

2"

60-13"

2-1/2"

60-14

2-1/2"

2"

60-14

2-1/2"

2"

60-14

2-1/2"

2"

60-19
60-14
60-13

2-1/2"

SECONDARY PUMP AND PIPE SELECTION DATA FOR

CONNECTIONS TO EACH PAIR OF BOILERS

1-1/4"

HW-300 1-1/4"
HW-399 1-1/2"

HW-300 1-1/4"
HW-420 1-1/2"

1-1/2"

1-1/2"

2"

2"

(2) HW-300

(1) HW-300

with

(1) HW-399

**

(1) HW-300

with

(1) HW-420

**

(2) HW-399

(2) HW-420

(2) HW-520

(2) HW-670

1.

BALL VALVE

2.

THERMOMETER

3.

BOILER CIRCULATING PUMP

4.

RELIEF VALVE

5.

SAFETY LIMIT CONTROL (If Required)

6.

SAFETY FLOW SWITCH

2"

1-1/2"
1-1/4"
2-1/2"

2"

1-1/2"

2-1/2"

2"

2"
2"

1-1/2"

2"
2"

1-1/2"
2-1/2"

2"
2"
3"

2-1/2"
2-1/2"
2-1/2"

NOTE:  Make most economical selection of secondary
pump and piping to provide a temperature rise compatible
with system design temperature and highest expected
boiler inlet temperature  Example system design at:

220° use 20° temp. rise
210° use 30° temp. rise
200° or less use 40° temp. rise

ASSUMING THAT PRIMARY PUMPING IS SIZED
FOR A 20° TEMPERATURE  DROP!

Secondary flow rate should not create a
temperature rise that will force boiler temperatures
up to the 240° maximum setting of limit controls.

** Flow rates through unequal models must be
adjusted to establish equal temperature rise.

* Trademark A.O. Smith Corporation

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