Product Overview

18
All CGS-C series boilers are equipped with tappings to permit the connection of a Link SL™ Indirect Water Heater,
or other indirect water heater. In this type of system, hot boiler water is drawn from below the water line and passed
through the heat exchanger in the indirect water heater. This section describes boiler-side piping only. Refer to Link SL™
Installation, Operating and Service Instructions for additional information
. The components in this system and their
functions are as follows:
1) Circulator - Mount the circulator as shown in Figure 13. The circulator should be located as low and as close to the
boileraspractical.Donotinstallvalves,orotherdeviceshavingasignicantpressuredrop,betweentheboiler
and the circulator inlet. All piping between the boiler and the circulator inlet should be 1”, regardless of the size of
the piping required in the rest of the system. See Figure 15 in Part X for wiring information.
2) “Y”Strainer-Installa“Y”strainertopreventsedimentfromaccumulatinginsidetheindirectwaterheater.
3) Check Valve - Prevents gravity circulation through the indirect water heater when the boiler is responding to a call
for heat.
4) Boiler Limit Control - Use a SPST break-on-rise temperature limit control such as the Honeywell L4006A. Do not
set the limit above 180°F as doing so may cause the boiler to steam when there is no call for heat. See Figure 15
for wiring information.
5) Valves and Unions - Install shut-off valves, drain valves, and unions in locations that will facilitate maintenance of
the system. Do not install any valves between the boiler and circulator inlet.
IMPORTANT
• Some indirect water heaters may not be suitable for use with a steam boiler. Consult the water heater
manufacturer’s guidelines before installing it in this type of system.
•  Boilerwatertemperaturesandowratesinthistypeofsystemmaybeconsiderablylowerthanthoseupon
which the water heater manufacturer’s ratings are based. This may result in substantially longer water heater
recovery times.
FIGURE 13: INDIRECT WATER HEATER BOILER-SIDE PIPING
IX. Indirect Water Heater Piping