LAARS Heating Systems
Page 22
Figure 9. Water Heater Piping — One Heater, One Tank.
NOTES:
5. CAUTION: PUMP SIZING MUST BE BASED UPON WATER HARDNESS AT
JOB SITE
1. OPTIONAL CWMU & RECIRC. LINE LOCATION.
2. LOCATE PENNANT DHW SENSOR OR REMOTE AQUASTAT
WELL IN LOWER 1/3 OF TANK.
3. BACK FLOW PREVENTER MAY BE REQUIRED. CHECK LOCAL CODES.
4. THERMAL EXPANSION TANK MAY BE REQUIRED. CHECK LOCAL CODES.
SU
PPL
Y
REC
IR
C.
CW
MU
1
CAUTION: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND VALVING, CHECK
WITH LOCAL CODES AND ORDINANCES FOR
ADDITIONAL REQUIREMENTS.
CHECK VALVE
THERMOMETER
TEMPERATURE
SENSOR
GLOBE VALVE
EXPANSION TANK
3-WAY VALVE
VALVE
PRESSURE REDUCING
VALVE
PUMP
PRV
TPRV
WATER CATEGORY
GRAIN HARDNESS PER GALLON
PPM / 17.1 = Grains Per Gallon
KEY:
S = SOFT
N = NORMAL
H = HARD
1 THROUGH 7.5
7.6 THROUGH 17
OVER 17
2
3
4
Figure 10. Water Heater Piping — Multiple Heaters, One Tank.
SUPPL
Y
RECIRC
.
CWMU
CAUTION: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND VALVING, CHECK
WITH LOCAL CODES AND ORDINANCES FOR
ADDITIONAL REQUIREMENTS.
NOTES:
6. CAUTION: PUMP SIZING MUST BE BASED UPON WATER HARDNESS AT
JOB SITE
1. OPTIONAL CWMU & RECIRC. LINE LOCATION.
2. LOCATE PENNANT DHW SENSOR OR REMOTE AQUASTAT
WELL IN LOWER 1/3 OF TANK.
3. BACK FLOW PREVENTER MAY BE REQUIRED. CHECK LOCAL CODES.
4. THERMAL EXPANSION TANK MAY BE REQUIRED. CHECK LOCAL CODES.
5. COMMON PIPING, SHOWN WITH HEAVY LINES, MUST BE SIZED
FOR MAXIMUM COMBINED HEATER FLOW RATE.
WATER CATEGORY
GRAIN HARDNESS PER GALLON
PPM / 17.1 = Grains Per Gallon
KEY:
S = SOFT
N = NORMAL
H = HARD
1 THROUGH 7.5
7.6 THROUGH 17
OVER 17
1
5
3
4
2
CHECK VALVE
THERMOMETER
TEMPERATURE
SENSOR
GLOBE VALVE
EXPANSION TANK
3-WAY VALVE
VALVE
PRESSURE REDUCING
VALVE
PUMP
PRV
TPRV
