LP-517 Rev. 000 Rel. 019 Date 7.21.20
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2. The expansion tank must be located as shown in Applications, this
manual, or following recognized design methods. See expansion
tank manufacturer’s instructions for details.
3. Connect the expansion tank to the air separator only if the
separator is on the suction side of the circulator. Always install the
system fill connection at the same point as the expansion tank
connection to the system.
4. Most chilled water systems are piped using a closed type
expansion tank.
Model
Heat Exchanger Volume (Gallons)
750
38
1000
61
Table 2 - Heat Exchanger Volume
E. Circulators
SIZING SPACE HEAT SYSTEM PIPING
Size the piping and components in the space heating system using
recognized design methods.
DO NOT
use the boiler circulator in any location other than
the ones shown in this manual. The boiler circulator location is
selected to ensure adequate flow through the boiler. Failure to
comply with this caution could result in unreliable performance
and nuisance shutdowns from insufficient flow.
F. Hydronic Piping with Circulators, Zone Valves, and
Multiple Boilers
The boiler is designed to function in a closed loop hydronic system.
The included temperature and pressure gauge allows the user to
monitor system pressure and outlet temperature from the boiler. It is
important to note that the boiler has a minimal amount of pressure
drop that must be calculated when sizing the circulators. Each boiler
installation must have an air elimination device that will remove air
from the system.
Install the boiler so the gas ignition system components are
protected from water (dripping, spraying, etc.). Allow clearance for
basic service of the boiler circulator, valves, and other components.
Observe minimum 1” clearance around all uninsulated hot water
pipes when openings around pipes are not protected by non-
combustible materials.
On a boiler installed above radiation level, some states and local
codes require a low water cut off device. This is provided standard
on the boiler. Check with local codes for additional requirements.
If the boiler supplies hot water to heating coils in air handler units,
flow control valves or other devices must be installed to prevent
gravity circulation of boiler water in the coils during the cooling
cycle. Chilled water medium must be piped in parallel with the
boiler.
Freeze protection for new or existing systems must use glycol
specifically formulated for this purpose. This glycol must include
inhibitors that will prevent it from attacking metallic system
components. Make certain that the system fluid is checked for the
correct glycol concentration and inhibitor level. The system should
be tested at least once a year and as recommended by the producer
of the glycol solution. Allowance should be made for the expansion
of the glycol solution in the system piping. Example: 50% by volume
glycol solution expands 4.8% in volume for the temperature
increase from 32
o
F to 180
o
F, while water expands 3% over the same
temperature rise.
Never use dielectric unions or galvanized steel fittings when
connecting to a stainless steel storage tank or boiler. Failure to follow
this instruction can lead to premature failure of the boiler system.
Such failures ARE NOT covered by warranty.
The boiler should not be operated as a potable hot water heater. The
boiler should not be used as a direct hot water heating device.