LAARS MagnaTherm MGV - Installation, Operation and Maintenance Instructions - Manual (Page 31)

MagnaTherm Boilers and Water Heaters Page 27
Figure 13. DHW Piping - Two Heaters, Two Vertical Tanks
NOTE:
This drawing shows
suggested piping configuration and
valving. Check with local codes and
ordinances for additional requirements.
Building
return
Supply
TPRV
2
Ball valve
(typical)
1
3
Cold water
supply
Expansion
tank
Pump
Pump
Check valve
Check valve
TPRV
7.6 MGV Water Flow
See Section 5 for water flow and head requirements.
Note - The head loss for the piping, fittings, and
accessories must be calculated and added to the
heater head loss to get the total required pump head.
An undersized pump will result in insufficient flow.
This can result in scale buildup and failure of the
heat exchanger.
7.7 Condensate Drain Trap
A condensate drain trap is included with the
MagnaTherm and is designed to drain the boiler of
condensate. The vent condensate should be drained
through a drain tee located in the vent line. This will
help prevent excessive condensate from entering the
boiler condensate trap.
Connect a 3/4” PVC pipe between the drain
connection and a floor drain (or condensate pump if a
floor drain is not accessible).
The condensate drain must be installed to
prevent the accumulation of condensate. When
a condensate pump is not used, the tubing must
continuously slope downward toward the drain with
no spiraling.
Consult local codes for the disposal method.
Caution
Condensate is mildly acidic (pH=5), and
may harm some floor drains and/or pipes,
particularly those that are metal. Ensure
that the drain, drainpipe, and anything that
will come in contact with the condensate
can withstand the acidity, or neutralize
the condensate before disposal. Damage
caused by failure to install a neutralizer
kit or to adequately treat condensate will
not be the manufacturer’s responsibility.
NOTES:
1. Locate the 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.
6. Common piping must be sized for
the combined water flow of all the
heaters.