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Page 26
6B.4 NTV Freeze Protection
The NTV unit must never be installed outdoors
in a location which may experience freezing
temperatures. 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.
6B.5 NTV Suggested Piping Schematics
Figures 17-19 show suggested piping configurations
for NTV boilers. These diagrams are only meant as
guides. All components or piping required by local
code must be installed.
Cold water
supply
1
4
Pump
Figure 17. DHW Piping - One Heater, Two Vertical Tanks
3
Expansion
tank
TPRV
6B.6 NTV Suggested Pumps
See Table 8 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. The can result in scale buildup
and failure of the heat exchanger.
NOTES:
1. Optional CWMU & recirculation line location.
2. Locate the NTV DHW sensor or remote aquastat well
in lower 1/3 of tank.
3. Back flow preventer may be required - check local
codes.
4. Thermal expansion tank may be required -
Building
check local codes.
return
5. Caution: Pump sizing must be based upon water
hardness at job site.
TPRV
2
WARNING: This drawing shows
suggested piping configuration and
valving. Check with local codes and
ordinances for additional requirements.
B
W
RADFORD
HITE
Supply
2
Ball valve
(typical)
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