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FIGURE 36
BOOSTER RECOVERY SYSTEM (PATENTED)
TWO TEMPERATURE SYSTEM WITHOUT RECIRCULATION
ONE HW-300, HW-399, HW-420, HW-520, HW-610 OR HW-670 UP-FLOW MODEL
COMMERCIAL BOILER WITH HORIZONTAL TANK
WIRING - FIGURE 25 OR 27
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.
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.
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.
FAIRLY ROUGH PIPE
Allowable Distance from Heater to Dishwasher (Feet./Meters)
Pressure
Drop (PSI) 25" 50" 75" 100" 175" 200" 250" 300"
(7.6m) (15m) (22.8m) (30m) (53m) (60m) (76m) (91m)
10 3/4 3/4 3/4 3/4 1 1 1 1
20 1/2 3/4 3/4 3/4 3/4 3/4 3/4 1
30 1/2 1/2 3/4 3/4 3/4 3/4 3/4 3/4
40 1/2 1/2 3/4 3/4 3/4 3/4 3/4 3/4
50 1/2 1/2 1/2 3/4 3/4 3/4 3/4 3/4
NOTE: Allowable pressure drop is the difference in PSI between supply
water pressure and the 20 PSI required at the dishwasher.
PIPE SIZES "B"
CIRCULATING LOOP TO DISHWASHER
Type L Copper Tubing
Allowable Distance from Heater to Dishwasher (Feet./Meters)
Pressure
Drop (PSI) 25" 50" 75" 100" 175" 200" 250" 300"
(7.6m) (15m) (22.8m) (30m) (53m) (60m) (76m) (91m)
10 1/2 3/4 3/4 3/4 3/4 3/4 1 1
20 1/2 1/2 1/2 3/4 3/4 3/4 3/4 3/4
30 1/2 1/2 1/2 1/2 3/4 3/4 3/4 3/4
40 1/2 1/2 1/2 1/2 1/2 3/4 3/4 3/4
50 1/2 1/2 1/2 1/2 1/2 3/4 3/4 3/4