LAARS MagnaTherm MGV - Installation, Operation and Maintenance Instructions - Manual (Page 29)

MagnaTherm Boilers and Water Heaters Page 25
7.2 MGV Suggested Piping Schematics
Figure 11 through Figure 13 show suggested piping
configurations for MGV boilers. These diagrams
are only meant as guides. All components or piping
required by local code must be installed.
7.3 MGV Piping Requirements
The water piping should be supported by suitable
hangers and floor stands. Do not support the piping
with this appliance. 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
Section 7 -
WATER CONNECTIONS
MGV UNITS
7.1 MGV Water Quality
MGV 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 the MGV in water with higher 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.
Figure 11. DHW Piping - One Heater, One Vertical Tank
NOTES:
1. Locate MGV DHW sensor or remote aquastat well
in lower 1/3 of tank.
2. Back flow 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.
NOTE: This drawing shows
suggested piping configuration and
valving. Check with local codes and
ordinances for additional requirements.
Location
of pump
TPRV
Supply
Building
return
Expansion
tank
Cold
water
supply
3
2 1