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Figure 27: Recommended Piping for
Indirect Water Heater
Figure 28: Tankless Heater Piping
Figure 26: Recommended Piping for Combination
Heating and Cooling (Refrigeration) Systems
E. Alliance Indirect Water Heater (if used). Refer to
Alliance Installation, Operating and Service Instructions
for additional information.
1. Steam. See Figure 27 for piping recommendations.
a. Supply and Return Piping. Connect supply
piping to Tapping "N" (1¼ NPT) and return
piping to Tapping "M" (1¼ NPT). Install zone
circulator and strainer in supply piping. Install
check valve to prevent gravity circulation of
boiler water.
b. Limit. See Figure 23. Install temperature limit
control (Honeywell L4006A or equal) in Tapping
"P" (¾ NPT). See Figure 2. Set at 180°F to
prevent steam production during non-space
heating periods.
5. Use boiler bypass if boiler is operated in system
which has a large volume or excessive radiation
where low boiler water temperatures may be
encountered (i.e. converted gravity circulation
system, etc.).
a. Bypass should be same size as supply and return
lines with valves located in bypass and supply
outlet as illustrated in Figures 25 and 25A in
order to regulate water ow to maintain higher
boiler water temperatures.
b. Set bypass and boiler supply valves to a half
throttle position to start.
c. After installation is complete, operate boiler
according to Section IX: System Start-up.
6. A hot water boiler installed above radiation level
must be provided with a low water cutoff device as
part of installation.
The low water cut off must be mounted in the
system piping above the boiler. The minimum safe
water level of a hot water boiler is just above the
highest water containing cavity of the boiler; that is,
a hot water boiler must be full of water to operate
safely (see XII. Appendix for further details) .
7. If a tankless heater coil is used, connect water lines
to ¾ NPT tappings in coil plate.
2. Water without tankless heater. Install in same
manner as space heating zone.
F. Tankless Heater (if used). See Figure 28.
1. Install automatic tempering or mixing valve to
prevent delivery of scalding hot water to xtures.
Higher temperature water for dishwashers and
automatic washers is possible by piping hot water
from heater prior to entering mixing valve. Install
per manufacturer's instructions.
WARNING
Install automatic mixing valve at tankless heater
outlet to avoid risk of burns or scalding due to
excessively hot water at xtures.
2. Install ow regulator. Match regulator rating to
tankless heater rating. Install in cold water inlet
below and minimum 3 feet downstream of tankless
heater inlet.
3. Install water softener in areas of hard water, this will
reduce mineral deposits which could hinder heat
transfer and delivery of hot water.