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5.B.5 Suggested Piping Schematics
Figure 8 through Figure 10 shows suggested piping
configurations for water heaters. These diagrams are
only meant as guides. All components or piping required
by local code must be installed.
Figure 8. DHW Piping - One Heater, One Vertical Tank
NOTES:
1. Locate 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.
5.B.3 Cold Water Make-Up
The cold water make-up may be connected to the tank
as shown in Figure 8 through Figure 10. 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
outlet. Install back-flow preventers and shut-offs where
needed or required by code.
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.
NOTE: This drawing is a schematic
representation of a piping style and is
not intended to be used as a working
installation drawing. Local code
requirements must be met.
5.B
Water Heaters
5.B.1
Water Quality
Water heaters must be installed in water conditions of
15 gpg hardness or less, with a pH range of 6.5 to 9.5
pH. Values outside of this range may reduce the life
expectancy of the product. Operating at higher water
hardness levels will cause heat exchanger fouling,
erosion, or corrosion, leading to premature component
failure, reduced efficiency, heat exchanger failure or
system failure. Failure of this type will not be warranted.
If the water in use exceeds the conditions recommended,
water softeners or other devices should be installed to
improve water quality.
5.B.2
Heater Water Connections
The water piping should be supported by suitable
hangers and floor stands. Do not support the piping with
this unit. The hangers used should allow for expansion
and contraction of copper pipe. Rigid hangers may
transmit noise through the system resulting from piping
sliding in the hangers. We recommend that padding be
used when rigid hangers are installed. Maintain 1” (2.5
cm) clearance to combustibles for hot water pipes.
Pipe the discharge of the relief valve (full size) to the
drain or in a manner to prevent injury in the event of
pressure relief. Install a diaphragm-type expansion
tank, flow check, and shutoff valves where needed or as
required by code.
LAARS Heating Systems
