Install Instructions

19
Boiler Piping
System Piping - Radiant Heating
The heat exchanger design of the CHAL-
LENGER allows operation in a condensing
mode. This feature requires no regulation of
the return water temperature back to the boiler
in radiant heating applications.
The maximum boiler water supply temperature
can be maintained by the CHALLENGER,
potentially eliminating the need for a mixing
system to achieve the desired temperature if all
zones of heat are at the same temperature set
point.
Size the system piping and circulator to provide
the flow needed for the radiant system.
To ensure an adequate flow rate through
the CHALLENGER, the boiler supply
and return piping size must be a mini-
mum of 1 inch.
System Piping - SMART Indirect Fired
Water Heater (I.F.W.H.)
See Figs. 7 and 8, page 20 for recommended pip-
ing for a Triangle Tube SMART I.F.W.H.. This
application will provide higher domestic hot
water flow rates for a short period of time (dump
load) and will recover the SMART tank faster
than a domestic storage tank. The SMART’s
boiler piping should be piped as a zone load in
the system. The CHALLENGER’s boiler piping
should be connected to the system piping in a
primary secondary piping arrangement.
The boiler system piping must be a
“closed” system to avoid any oxygen
contamination and potential failure of
the outer tank of the SMART.
The CHALLENGER’s domestic piping should
not be utilized. Refer to the installation manual
provided with the SMART for additional instal-
lation details.
See Parameter 1 and Note 3, page 52 for para-
meter, wiring and operational details using the
SMART I.F.W.H. with a CHALLENGER boil-
er.
System Piping - Special Application
If the boiler is used in conjunction with a
chilled water/medium system, the boiler and
chiller must be piped in parallel. Install
flow/check valves to prevent the chilled medi-
um from entering the boiler.
If the boiler is used to supply hot water to the
heating coils of an air handler where they may
be exposed to chilled air circulation, install
flow/check valves or other automatic devices
to prevent gravity circulation of the boiler
water during cooling cycles.
NOTICE
NOTICE