LAARS Heating Systems
Page 30
Figure 13. DHW Piping - One Heater, Two Vertical Tanks
Cold
water
supply
2
Expansion
tank
1
Pump
TPRV
1
Building
return
Ball valve
(typical)
TPRV
Supply
Building
return
Expansion
tank
Cold
water
supply
3
2
NOTE:
This drawing shows suggested
piping configuration and
valving. Check with local codes
and ordinances for additional
requirements.
NOTES:
1. Locate the DHW sensor or remote aquastat
well in lower 1/3 of tank.
2. Backflow preventer may be required -
check local codes.
3. Thermal expansion tank may be required -
check local codes.
4. Caution: Pump sizing must be based
upon water hardness at job site.
5. If the tank does not have a tapping for the
cold water supply, the supply may be run to
the pipe between the tank and boiler inlet.
6. This piping used only with Custom Tank
System using large draw down and sparge
tube.
5.B.4 Freeze Protection
If installing outdoors in a location that may experience
freezing temperatures, precautions must be taken to
prevent water in the heat exchanger and condensate
inside and outside of the boiler from freezing. Damage
due to freezing water or condensate is not covered by the
warranty.
If installed indoors and there is an event such as a
power outage, component failure or other issue when
freezing is likely, the heater and system must be drained
to avoid the risk of damage due to freezing. Glycol must
not
be used in volume water heating applications.
5.B.5 Suggested Piping Schematics
This heater is a high efficiency appliance. Heater
efficiency can be maximized by using piping
configurations that return the lowest temperature
possible to the heater, while still meeting the needs of
the system.
Figure 12 through Figure 14 show suggested piping
configurations for water heaters. These diagrams are
only meant as guides. All components or piping required
by local code must be installed.
