A.O. Smith 300-2, 399-2, 420-2, 520-2, 670-2 Technical Documents
LINEAR-TEMP* SYSTEM
APPLICATION TYPE DIAGRAM
SEE INSTALLATION MANUAL FOR
COMPLETE INSTRUCTIONS
INSTALL IN ACCORDANCE WITH LOCAL CODES.
300-2, 399-2, 420-2, 520-2 OR 670-2
SECONDARY PUMP AND PIPE SELECTION DATA FOR
CONNECTIONS TO EACH PAIR OF BOILERS
Boiler Temp. Secondary Boiler Pump Boiler
Model Rise Piping Selection Inlet & Outlet
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"
HW-300 1-1/4"
HW-399 1-1/2"
HW-300 1-1/4"
HW-420 1-1/2"
(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
20°
30°
40°
20°
30°
40°
20°
30°
20°
30°
40°
20°
30°
40°
20°
30°
40°
20°
30°
35°
40°
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"
1-1/4"
1-1/2"
1-1/2"
2"
2"
1. BALL VALVE
2. THERMOMETER
3. BOILER CIRCULATING PUMP
4. RELIEF VALVE
5. SAFETY LIMIT CONTROL (If Required)
6. SAFETY FLOW SWITCH
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
Revised June 1998 E 117.0
LINEAR-TEMP* SYSTEM
300-2, 399-2, 420-2, 520-2 OR 670-2
APPLICATION TYPE DIAGRAM
SEE INSTALLATION MANUAL FOR
COMPLETE INSTRUCTIONS
INSTALL IN ACCORDANCE WITH LOCAL CODES.
SECONDARY PUMP AND PIPE SELECTION DATA FOR
CONNECTIONS TO EACH PAIR OF BOILERS
Boiler Temp. Secondary Boiler Pump Boiler
Model Rise Piping Selection Inlet & Outlet
(2) HW-399
(2) HW-420
(2) HW-520
(2) HW-670
20°
30°
40°
20°
30°
40°
20°
30°
40°
20°
30°
35°
40°
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"
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"
1-1/2"
1-1/2"
2"
2"
1. BALL VALVE
2. THERMOMETER
3. BOILER CIRCULATING PUMP
4. RELIEF VALVE
5. SAFETY LIMIT CONTROL (If Required)
6. SAFETY FLOW SWITCH
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
E 118.0 © A. O. SMITH CORP. 1998 Printed in the U.S.A.
Loading...