MagnaTherm Boilers and Water Heaters
Page 31
tank, flow check, and shutoff valves where needed
or as required by code.
The piping should be installed so that each pump
supplies flow only to the heater to which it is
attached.
7.4 Cold Water Make-Up
The cold water make-up may be connected to the
tank as shown in Figure 14 through Figure 16. 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. Install back-flow preventers
and shut-offs where needed or required by code.
Figure 15. DHW Piping - One Heater, Two Vertical Tanks
7.5 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.
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. 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. This piping used only with Custom
Tank System using large draw down
and sparge tube.
