INTERIOR CONNECTIONS (continued)
When circulation is reduced because of an electrical
power failure the installation of a hot-water
circulation loop that will dissipate at least 10% of the
estimated rated heat output of the solid-fuel boiler is
recommended with the following guidelines:
• The loop can only be made inoperative by a
deliberate manual action.
• The design parameters for sizing shall be a pipe
size > 3/4 inch (18 mm), room temperature of 65°
F (18° C), and mean water temperature of 180° F
(82° C).
• The loop be positioned above the boiler, with
features that promote natural thermal circulation of
the water.
The piping used in the system should not cause any
restrictions that could create excessive pressure in the
system. Eg. Reducing from 1" pipe to ½" pipe
Flat Plate Exchanger For Pressurized
Systems
Flat plate exchanger systems that are used with
pressurized systems such as in floor heating or hot
water baseboard systems help to heat the water
going in to the pressurized system while keeping the
two systems separate. Because an outdoor furnace
is an open system (not pressurized) and the system
tied in to in this type of application is pressurized it
allows both systems to stay the same while being
operational.
The water supplied by the outdoor furnace will heat
the water in the pressurized system while the present
heat source in the pressurized system (such as a
boiler) can be used as a back up heat source in case
of emergency or need for additional heat.
Domestic Hot Water
OPERATION AND MAINTENANCE MANUAL
Flat plate exchanger systems used to pre-heat
domestic water tanks are generally easier to install,
more efficient and more reactive to hot water
demands then tube and shell (sidearm) systems. They
C-150, C-250, C-375, C-500, C-800
are mounted on the supply line and pre-heat the
water going in to the hot water tank.
Model:
By SteelTech Inc.
Version 2
Forced Air Furnace (Water-To-Air Exchanger)
The water-to-air heat exchanger must be mounted so
that air blows through the fins (coils). The exchanger
should be mounted below the A/C coil if possible.
The exchanger should be sized to fit existing duct
work and should produce about as many BTU's as
the existing heat source. An exchanger that produces
too many BTU's will result in uneven heat and the fan
stopping too quickly while a heat exchanger that is
undersized will not produced the necessary BTU's.
On systems with Air Conditioning it is very important
to not restrict airflow as it will cause the freon coil to
freeze up. Using standard outdoor furnace 3 row coils,
a minimum of 80 sq. in. of coil should be used per
ton of cooling. Exchangers can be mounted in cold
air returns but greater care must be taken as heat
from the exchanger can interfere with the air handler
controls and/or sensors.
It is important that the warm-air supply-duct system be
constructed of metal in accordance with NFPA 90B-
1993, 2-1.1 if the outlet-air temperature of a central
furnace exceeds 250° F (121° C) when it is tested in
accordance with the requirements for Simultaneous
Firing in 56.4.1 and 56.4.2 of the standard. It is also
important that the plenums installed to the furnaces be
constructed of metal in accordance with NFPA 90B-
1993, 2-1.3.
Forced air furnace with water-to-air exchanger
Serial No.:
UL 2523-2009
UL 391 (1995)
CAN/CSA B366.1-M91
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