Laars MIGHTY THERM2 MT2H Installation And Operation Instruction Manual page 22

Page 22
CAUTION: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND VALVING, CHECK
WITH LOCAL CODES AND ORDINANCES FOR
ADDITIONAL REQUIREMENTS.
NOTES:
1. OPTIONAL CWMU & RECIRC. LINE LOCATION.
2. LOCATE 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. CAUTION: PUMP SIZING MUST BE BASED UPON WATER HARDNESS AT
JOB SITE
THERMOMETER
TEMPERATURE
SENSOR
Figure 10. Water Heater Piping — One Heater, One Tank.
CAUTION: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND VALVING, CHECK
WITH LOCAL CODES AND ORDINANCES FOR
ADDITIONAL REQUIREMENTS.
NOTES:
1. OPTIONAL CWMU & RECIRC. LINE LOCATION.
2. LOCATE 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.
6. CAUTION: PUMP SIZING MUST BE BASED UPON WATER HARDNESS AT
JOB SITE
THERMOMETER
TEMPERATURE
SENSOR
Figure 11. Water Heater Piping — Multiple Heaters, One Tank.
GLOBE VALVE 3-WAY VALVE
CHECK VALVE VALVE
GLOBE VALVE 3-WAY VALVE
CHECK VALVE VALVE
WATER CATEGORY
GRAIN HARDNESS PER GALLON
S = SOFT
N = NORMAL
H = HARD
PPM / 17.1 = Grains Per Gallon
1
2
TPRV PRESSURE REDUCING
VALVE
PRV PUMP
4
3
2
TPRV PRESSURE REDUCING
VALVE
PRV PUMP
LAARS Heating Systems
KEY:
1 THROUGH 7.5
7.6 THROUGH 17
OVER 17
3
4
EXPANSION TANK
KEY:
WATER CATEGORY
GRAIN HARDNESS PER GALLON
S = SOFT 1 THROUGH 7.5
N = NORMAL 7.6 THROUGH 17
OVER 17
H = HARD
PPM / 17.1 = Grains Per Gallon
5
EXPANSION TANK
1