18
Figure 24: Recommended Piping for
Indirect Water Heater
Figure 25: Tankless Heater Piping
Figure 23: Recommended Piping for Combination
Heating and Cooling (Refrigeration) Systems
F.
Tankless Heater
(if used). See Figure 25.
1. Install automatic tempering or mixing valve to
prevent delivery of scalding hot water to fixtures.
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 fixtures.
2. Install flow 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.
G.
If a long term pressure test of the hydronic system is
required, the boiler should first be isolated to avoid a
pressure loss due to the escape of air trapped in the
boiler.
To perform a long term pressure test including the
boiler, ALL trapped air must first be removed from the
boiler.
A loss of pressure during such a test, with no visible
water leakage, is an indication that the boiler contained
trapped air.
4. If a tankless heater coil is used, connect water lines
to ¾ NPT tappings in coil plate.
E.
Alliance SL™ Indirect Water Heater
(if used). Refer
to Alliance SL™ Installation, Operating and Service
Instructions for additional information. See Figure 24
for piping recommendations.
1. 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.
2. Limit. See Figure 21. 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.
V. Piping and Trim (continued)
Summary of Contents for INDEPENDENCE
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