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

Easy to Use

All Pennant water heater/boilers are built to operate
effectively at up to 10,000 feet, in harsh environments
from -40° to +140°F, and to withstand thermal shock
down to 30°F. Pennant boilers can be used with up to a
50:50 glycol to water mix and waterways can operate in
water with a hardness up to 17 gpg. Pennant units feature
compliant end walls to accommodate thermal expansion.
Status lights and the control display easily show the
Pennant’s operating status.

The Pennant is the easy choice. With Pennant’s high
efficiency, operating costs are minimized. Pennant’s
performance and low maintenance delivers the savings!

Features Summary

Unmatched Performance

• Applications for Hydronic and Domestic Hot Water

• Up to 85% efficiency

Front access panel with status indicator lights,
6 mode programmable control, and slide out tray

• NOx below 10 ppm

• 2-stage, 3-stage, and 4-stage firing

• Immune to thermal shock down to 30°F

• Operates in altitudes up to 10,000 feet

• Ambient temperatures from -40°F to +140°F

• Tolerant of glycol systems

• Waterways able to operate in a maximum water

hardness of 17 gpg

• Hydronic Models supply temps from 125°F to 220°F

• Gas supply right or left side (field convertible)

• Volume Water Heater models supply temps

from 125°F to 210°F

• Maintains efficiency and low NOx levels at all

stages of firing

• Model sizes: (2-Stage) 500, 750, (3-Stage) 1000,

(4-Stage) 1250, 1500, 1750, 2000

• Optional factory-mounted pump sized for heat

exchanger, 30 feet of pipe and 3 elbows total
pressure drop

• Fan-assisted combustion system

• 120vac, 60 Hz single phase power

• Front access panel with status indicator lights

• User-friendly programmable control to 6 modes

• BAS interface

• May be ordered with left or right-hand piping connection

BAS Interface

Durable, Long-Lasting Construction

• Modular construction: burner trays, gas train,
blower assembly

• Glass-lined cast iron or bronze headers

• Heat exchanger uses efficient 10 finned-tube design

• Lightweight insulation

• Construction suitable for rack mounting up to 2 boilers

• Compliant end-walls to accommodate thermal expansion

• Non-ferrous waterways to meet standards for volume
water heaters

• Backed by LAARS warranty and superior customer
service

• Two Pennants may be rack-mounted to save valuable
floor space

Top or rear vent and combustion air connections

Easy access ignitor

Flexible Venting

• Category III (horizontal) venting, up to 50 feet with
3 elbows, without additional fans

• Fan-assisted Category I venting with standard B-vent

• Combustion air can be taken from room, or ducted
to the unit from the outside

• Top or rear vent and combustion air connections

Dimensional Data Dimensions shown in inches, cm.

Non pump-mounted unit shown.

Easy Maintenance

• Heat exchanger is easily removed from top or front

• Washable air filter

• Clean wiring layout makes electrical troubleshooting easy

• Easy access to ignitor via special service panel

• Easy-to-service burner assembly

• LAARS hidden fastener jacket (HFJ) system reduces time
and effort for teardown and assembly

• Service-friendly slide-out control panel

Size A B C D E F G Air Conn. W* Vent Conn. V* Horiz. Vent

500 33½ 85 15¾ 40 5¾ 15 29¾ 76 32¾ 83 7¾ 20 8¾ 22 6 15 6 15 6 15

750 45½ 116 21¾ 55 5¾ 15 29¾ 76 32¾ 83 7¾ 20 8¾ 22 6 15 8 20 6 15

1000 57½ 146 28¾ 73 5¾ 15 29¾ 76 32¾ 83 7¾ 20 7 18 8 20 10 25 8 20

1250 68 172 34 86 101/826 30¾ 78 29½ 75 8¾ 22 8¾ 22 8 20 10 25 8 20

1500 78½ 199 39¾ 101 101/826 30¾ 78 29½ 75 8¾ 22 8¾ 22 8 20 12 30 8 20

1750 89 226 44½ 113 101/826 30¾ 78 29½ 75 8¾ 22 8¾ 22 8 20 14 36 8 20

2000 99½ 253 49¾ 126 101/826 30¾ 78 29½ 75 8¾ 22 8¾ 22 12 30 14 36 12 30

*Air and vent connections may be on top or back of the Pennant, and are field convertible. Dimensions shown in inches cm.

Sizing Data

1

IBR Net

Rating Firing Gas Conn. Water Conn. Shipping

2

Indoor Input

1,3

Output

1,3

Model BTU/H BTU/H BTU/H Rate inches inches Weight

x1000 x1000 x1000 lbs. kg

500 500 425 361 2-Stage 1¼ 2 425 193

750 750 638 542 2-Stage 1¼ 2 505 229

1000 999 849 722 3-Stage 1½ 2½ 615 279

1250 1250 1063 903 4-Stage 2 2½ 675 306

1500 1500 1275 1084 4-Stage 2 2½ 760 345

1750 1750 1488 1264 4-Stage 2 2½ 825 375

2000 1999 1699 1444 4-Stage 2 2½ 955 434

NOTES: 1. Input and output must be derated 4% per 1000 feet above sea level when installed above 2000 feet altitude.

2. Units with pumps: Add 55 lbs. (25kg).

3. For other boiler ratings:

Boiler Horsepower: HP = Output Radiation Surface: EDR sq. ft. = Output IBR sq. ft. = Net IBR Rating

33,475 150 150

Water Flow Requirements/Boiler Temperature Rise in Degrees

20°F 11°C 25°F 14°C 30°F 17°C 35°F 19°C

Indoor Flow H/L Flow H/L Flow H/L Flow H/L Flow H/L Flow H/L Flow H/L Flow H/L

Model gpm feet lpm m gpm feet lpm m gpm feet lpm m gpm feet lpm m

500 43 1.7 161 0.5 34 1.1 129 0.3 28 0.9 107 0.3 24 0.7 92 0.2

750 64 3.3 241 1.0 51 2.3 193 0.7 43 1.7 161 0.5 36 1.2 138 0.4

1000 85 5.0 321 1.5 68 3.6 257 1.1 57 3.1 214 0.9 48 2.2 184 0.7

1250 106 8.1 401 2.5 85 6.1 322` 1.9 71 4.7 269 1.4 61 3.4 231 1.0

1500 128 10.0 483 3.0 102 7.2 386 2.2 85 5.5 322 1.7 73 4.2 276 1.3

1750 N/R N/R N/R N/R 119 10.5 451 3.2 99 8.4 375 2.6 85 5.8 322 1.8

2000 N/R N/R N/R N/R 136 12.5 515 3.8 113 10.4 429 3.2 97 8.3 368 2.5

Headloss/Water Heater Headloss shown is for Pennant heat exchanger only

Hard Water Normal Water Soft Water

Indoor Flow H/L Flow H/L Flow H/L Flow H/L Flow H/L Flow H/L
Model gpm feet lpm m gpm feet lpm m gpm feet lpm m

500 90 3.5 341 1.1 68 2.3 257 0.7 45 1.8 170 0.5

750 90 6.0 341 1.8 68 3.0 257 0.9 45 2.1 170 0.6

1000 90 6.1 341 1.9 68 3.6 257 1.1 45 2.3 170 0.7

1250 90 6.3 341 1.9 68 3.8 257 1.2 68 3.9 257 1.2

1500 90 6.5 341 2.0 68 3.9 257 1.2 68 3.9 257 1.2

1750 90 6.7 341 2.0 68 4.0 257 1.2 68 4.0 257 1.2

2000 112 10.0 424 3.0 112 10.0 424 3.0 112 10.0 424 3.0

Clearances

Appliance Required to Suggested
Surface Combustible Service Access

Material
Left Side 1” 2.5 cm 24” 61 cm
Right Side 1” 2.5 cm 24” 61 cm
Top 1” 2.5 cm 12” 30 cm

*

Back
Front 1” 2.5 cm 36” 91 cm
Vent Per venting system supplier’s

*When vent or air is connected to the back, 36"
(91cm) is suggested.

1” 2.5 cm 12” 30 cm

instructions

Recovery Data/Water Heater Water Temperature Rise in Degrees

Indoor 40°F 22°C 50°F 28°C 60°F 33°C 70°F 39°C 80°F 44°C 90°F 50°C 100°F 56°C 120°F 67°C 140°F 78°C
Model gph L/h gph L/h gph L/h gph L/h gph L/h gph L/h gph L/h gph L/h gph L/h

500 1276 4821 1020 3857 850 3214 729 2755 638 2411 567 2143 510 1929 425 1607 364 1378

750 1913 7232 1531 5786 1276 4821 1093 4133 957 3616 850 3214 765 2893 638 2411 547 2066

1000 2548 9633 2039 7707 1699 6422 1456 5505 1274 4817 1133 4281 1019 3853 849 3211 728 2752

1250 3189 12054 2551 9643 2126 8036 1822 6888 1594 6027 1417 5357 1276 4821 1063 4018 911 3444

1500 3827 14464 3061 11571 2551 9643 2187 8265 1913 7232 1701 6429 1531 5786 1276 4821 1093 4133

1750 4464 16875 3571 13500 2976 11250 2551 9643 2232 8438 1984 7500 1786 6750 1488 5625 1276 4821

2000 5099 19276 4080 15421 3400 12851 2914 11015 2550 9638 2266 8567 2040 7710 1700 6425 1457 5507

Note: gph = gallons per hour, L/h = liters per hour.

LAARS Heating Systems Company has stood for quality, reliability,

and innovation in heating system design for more than 50 years.

Pennant builds on that tradition with an outstanding line of

commercial boilers/water heaters designed for today’s most

demanding indoor and outdoor environments.

20 Industrial Way

Rochester, NH 03867

603.335.6300

603.335.3355 Fax

Sales & Service:

1355 Kuehner Drive

Simi Valley, CA 93063

800.900.9276

800.559.1583 Fax

480 S. Service Road West

Oakville, Ontario
Canada L6K 2H4

905.844.8233

905.844.2635 Fax

www .Laars.com

Litho in U.S.A. ©Laars Heating Systems Company 0508 Document 1182E