Laars Pennant User Manual

®

Pennant

The Easy Choice

Easy to install, easy to maintain and easy to use.

For more than 50 years, the LAARS brand has stood for
quality, reliability, and innovation in heating system design.
Now, Pennant builds on that tradition with an outstanding
line of commercial boilers/heaters designed for today’s
most demanding indoor and outdoor environments. The
Pennant line of fan-assisted, modular boilers and water
heaters from LAARS ranks among the industry’s most
versatile and environmentally friendly commercial systems
for hydronic and hot water applications. Available in 7 sizes
from 500 to 2000 MBTU/h, Pennant boilers and water
heaters run reliably on natural or LP gas and deliver
efficiency levels up to 85%. Pennant systems are also
among the “greenest” in the industry with NOx emissions
below 10 ppm.

Pennant boilers and water heaters feature convenient,
modular construction that separates the burner trays, gas
train, and blower assembly. All Pennant models use
lightweight insulation, glass-lined cast iron or bronze
headers, and non-ferrous waterways. The 10 tube heat
exchanger design uses finned tubing for the quickest and
most efficient heat transfer and the water heater meets the
ASHRAE 90.1 standard for efficiency for use with storage
tanks. Pennants are also available with copper or
cupronickel heat exchanger tubing for use in various water
and flow rate conditions, and may include optional factory­mounted pumps sized for the heat exchanger and 30 feet
of piping.

With superior overall construction and high-efficiency
combustion, Pennant can cut fuel costs significantly
compared to conventional water heating systems, and the
savings can amount to thousands of dollars over the life of
the equipment.

without the addition of external vent fans. Vent and
combustion air connections can be located on the top or
the back of the unit, in any combination, and every unit has
a long-lasting, washable air filter to keep the burner clean,
ensuring its long life.

Pennant boilers make installation easier by providing a
control system that gives installers several different modes
of operation that are selected with the touch of a button.
These modes allow the installer to choose the mode that
best matches the needs of the system. Modes include
settings for primary/secondary piping, DHW storage tank
systems, B.A.S. controls and other common applications.

Easy to Maintain

Ongoing maintenance of Pennant is easy. The burner
assembly features modular burner trays to ensure perfect
alignment of orifices and burners, gas manifolds mount on
the burner flange, and the burner flanges seal to the air
box. In addition, the entire gas train can be easily removed
and the heat exchanger simply lifts out from the top or front
of the unit. The air filter is a breeze to clean...just wash it
with soap and water.

Controls are also service-friendly with clean and simple
wiring and are readily accessible in a slide-out drawer. All
models have a convenient front-access panel with status
indicator lights to monitor power, call for heat, pump on,
ignitor on, gas valve open, and lock out.

Easy to Install

The modular construction makes Pennant units easy to
install and maintain. Water connection may be reversed to
accommodate left or right side piping.

The sealed combustion system is fan-assisted and uses
either ambient room air, or air from the outside ducted
directly to the unit. This allows the Pennant to be vented as
a Category I or Category III appliance. Category I fan­assisted appliances allow for smaller diameter vents than
natural draft units, but can still be vented with standard
B-vent. When the Pennant is vented horizontally, as a
Category III appliance, it uses AL29-4C stainless steel. It
may be vented horizontally up to 50 feet with three elbows

Modular construction,

compliant end-walls and

non-ferrous waterways