LAARS Pennant PNCV User Manual

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Page 1

Installation and Operation Instructions Document 1204D

Heating Systems Company

A subsidiary of CorporationBRADFORD WHITE

Installation and Operation Instructions for

Low Temperature

™

PENNANT

Hydronic Boiler Model PNCH

Water Heater Model PNCV

FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,

qualified in hot water boiler installation and maintenance. Improper installation and/or operation could create carbon monoxide gas in flue gases which could cause serious injury, property damage, or death. Improper installation and/or operation will void the warranty. For indoor installations, as an additional measure of safety, Laars strongly recommends installation of suitable Carbon Monoxide detectors in the vicinity of this appliance and in any adjacent occupied spaces.

WARNING

If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life.

Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electrical switch; do not use any phone in your building.

• Immediately call your gas supplier from a nearby phone. Follow the gas supplier's instructions.

• If you cannot reach your gas supplier, call the fire department.

Installation and service must be performed by a qualified installer, service agency, or gas supplier.

Assurez-vous de bien suivres les instructions données dans cette notice pour réduire au minimum le risque d’incendie ou d’explosion ou pour éviter tout dommage matériel, toute blessure ou la mort.

Ne pas entreposer ni utiliser d’essence ni d’autres vapeurs ou liquides inflammables dans le voisinage de cet appareil ou de tout autre appareil.

QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ:

• Ne pas tenter d’allumer d’appareils.

• Ne touchez à aucun interrupteur. Ne pas vous servir des téléphones dansle bâtiment où vous trouvez.

• Appelez immédiatement votre fournisseur de gaz depuis un voisin. Suivez les instructions du fournisseur.

• Si vous ne pouvez rejoindre le fournisseur de gaz, appelez le sservice des incendies.

L’installation et l’entretien doivent être assurés par un installateur ou un service d’entretien qualifié ou par le fournisseur de gaz.

AVERTISSEMENT

H2319100D

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LAARS Heating Systems

TABLE OF CONTENTS

SECTION 1. General Information

1.1 Introduction ...................................................... 3

1.2 Model Identication .......................................... 4

1.3 Warranty .......................................................... 4

1.4 Dimensions ...................................................... 4

1.5 Locating the Appliance..................................... 4

1.6 Locating Pump-Mounted Water Heater

with Respect to Storage Tank(s) ...................... 6

1.7 Locating Pump-Mounted Boiler with

Respect to Return/Supply Header ................... 6

1.8 Locating Appliance for Correct Horizontal Vent/Ducted Air Distance

From Outside Wall ........................................... 6

SECTION 2. Venting and Combustion Air

2.1 Combustion Air ................................................ 7

2.1.1 Combustion Air From Room ............................ 7

2.1.2 Intake Combustion Air...................................... 7

2.2 Venting ............................................................. 8

2.2.1 Vent Categories ............................................... 8

2.2.2 Category I Vent ................................................ 8

2.2.3 Common Venting Systems .............................. 8

2.2.4 Category III Vent .............................................. 9

2.3 Locating Vent & Combustion Air Terminals ...... 9

2.3.1 Side Wall Vent Terminal ................................... 9

2.3.2 Side Wall Combustion Air Terminal ................ 12

2.3.3 Vertical Vent Terminal .................................... 12

2.3.4 Vertical Combustion Air Terminal ................... 12

2.4 Common Vent Test – Boilers ......................... 12

2.5 Vent Terminals for Outdoor Units ................... 13

SECTION 3. Gas Supply and Piping

3.1 Gas Supply and Piping .................................. 14

SECTION 4A. Water Connections – Pennant Boiler

4A.1 Heating System Piping:

Hot Supply Connections – Boiler ................... 16

4A.2 Cold Water Make-Up – Boiler ........................ 16

4A.3 Water Flow Requirements – Boiler ................ 16

4A.4 Freeze Protection – Boiler ............................. 16

SECTION 4B. Water Connections – Pennant Water Heater

4B.1 Water System Piping – Water Heater ............ 17

4B.2 Hot Water Supply Piping – Water Heater ...... 17

4B.3 Water Flow Requirements – Water Heater .... 17

4B.4 Combined Water (potable)

Heating and Space Heating ........................... 17

4B.5 Freeze Protection – Water Heater ................. 17

SECTION 5. Electrical Connections

5.1 Main Power .................................................... 20

5.1.1 Sizes 500-1500 .............................................. 21

5.1.2 Sizes 1750-2000 ............................................ 21

5.1.3 Separate Pump Circuit................................... 21

5.1.4 All Sizes ......................................................... 21

5.2 Field Wiring ................................................... 21

SECTION 6. Operating Instructions

6.1 Filling the Boiler System ................................ 28

6.2 Sequence of Operation .................................. 28

6.3 Temperature (Operating) Control ................... 29

6.3.1 Temperature Control Overview ...................... 29

6.3.2 Programming Parameters-Boilers ................. 29

6.3.3 Programming Parameters-Water Heaters ..... 30

6.4 Limit Controls ................................................. 30

6.5 Operating the Burner and Set Up .................. 30

6.5.1 Set Up for 0 to 2500 Feet Altitude.................. 30

6.5.2 High Altitude Adjustment and Set Up ............. 31

6.6 Shutting Down the Pennant ........................... 31

6.7 To Restart the Pennant .................................. 31

SECTION 7. Maintenance

7.1 System Maintenance ..................................... 32

7.2 Appliance Maintenance and

Component Description ................................. 32

7.2.1 Burners .......................................................... 32

7.2.2 Filter ............................................................... 33

7.2.3 Gas Valves ..................................................... 33

7.2.4 Manual Reset High Limit Control ................... 33

7.2.5 Automatic Reset High Limit Control ............... 33

7.2.6 Temperature Control ...................................... 33

7.2.7 Ignition Control............................................... 33

7.2.8 Ignitor ............................................................. 34

7.2.9 Transformer ................................................... 34

7.2.10 Blowers .......................................................... 34

7.2.11 Flow Switch ....................................................34

7.2.12 Heat Exchanger Coil ...................................... 34

SECTION 8. Trouble Shooting

8.1 Resolving Lockouts........................................ 35

8.2 Delayed Ignition – Possible Causes .............. 35

8.3 Short Cycling – Boiler .................................... 35

8.4 Short Cycling – Water Heater ........................ 36

8.5 High Gas Consumption.................................. 36

8.6 Troubleshooting Pennant Controls ................ 36

SECTION 9. Replacement Parts

9.1 General Information ....................................... 36

9.2 Parts List ........................................................ 36

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Low Temperature Pennant

SECTION 1. General Information

USING THIS MANUAL – Because the Pennant Boilers and Pennant Water Heaters are identical appliances, with the exception of materials of manufacture, labels and ultimate use application, this manual provides information for the proper installation, operation and maintenance of both products. Where differences exist between the application of the appliances and their operation, the sections pertinent to only one appliance or the

other will be so identied.

In the Commonwealth of Massachusetts, this appliance must be installed by a licensed plumber or

gas tter.

WARNING

To minimize the risk of electric shock, fire or other hazards which could result in property damage, injury, or death. The Pennant hydronic, boiler or water heater must be installed in accordance with the procedures detailed in this manual, or the Laars Heating Systems warranty may be voided. The installation must conform to the requirements of the local jurisdiction having authority, and, in the United States, to the latest edition of the National Fuel Gas Code, ANSI Z223.1/NFPA54. In Canada, the installation must conform to the latest edition of the Natural Gas and Propane Installation Code, CSA B149.1 and/or applicable local codes. Where

Afin de réduire au minimum les risques de commotion électrique, de feu ou d’autre nature, qui pourraient causer des dommages matériels, des blessures ou des accidents mortels, les chaudières à eau chaude ou les chauffe-eau Pennant doivent être installés conformément aux directives détaillées contenues dans ce manuel, à défaut de quoi la garantie fournie par Laars Heating Systems serait annulée. L’installation doit être conforme aux exigences de la réglementation locale en vigueur et, aux États-Unis, à l’édition la plus récente du Natural Fuel Gas Code (Code pour le gaz combustible naturel) ANSI Z223.1/NFPA54. Au Canada, l’installation doit respecter les exigences de la plus récente édition du Code d’installation du gaz naturel et du propane CSA B149.1, et/ou des codes locaux de construction en vigueur. Lorsque la réglementation locale l’exige, l’installation des appareils électroménagers Pennant doit respecter les exigences du Standard for Controls and Safety Devices for Automatically Fired Boilers (Code pour les équipements de commande et de sécurité des chaudières à combustion automatique), ANSI/ ASME CSD-1. Toute modification apportée à la chaudière, aux régulateurs de gaz ou au câblage, peut compromettre la garantie. Si certaines conditions particulières rendent des adaptations nécessaires, consulter un représentant du fabricant avant d’entreprendre ces modifications.

required by the authority having jurisdiction, the installation of Pennant appliances must conform to the Standard for Controls and Safety Devices for Automatically Fired Boilers, ANSI/ASME CSD-1. Any modifications to the boiler, its gas controls, or wiring may void the warranty. If field conditions require modifications, consult the factory representative before initiating such modifications.

All application and installation procedures

should be reviewed completely before proceeding with

the installation. Consult the Laars Heating Systems

factory, or local factory representative, with any issues

or questions regarding this equipment. Experience

has shown that most operating issues are caused by

improper installation.

The Pennant appliance is protected against over

1.1 Introduction

This manual provides information necessary for the installation, operation, and maintenance of Laars Heating Systems’ Low temperature Pennant copper tube appliances, sizes 500-2000 (standard appliances

pressurization. A pressure relief valve is tted to all appliances. It is installed on the outlet header, at the water outlet of the appliance.

IMPORTANT: The inlet gas pressure to the appliance must not exceed 13 in. w.c. (3.2 kPa).

are covered in a separate manual). Read it carefully before installation.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

P N C A C C 2

AVERTISSEMENT

Page 3

SERIES

P N C

USAGE

SIZE

0 5 0 0

0 7 5 0

1 0 0 0

1 2 5 0

1 5 0 0

1 7 5 0

2 0 0 0

FUEL

ALTITUDE

LOCATION

FIRING

MODE

C ON-OFF

REVISION

HEAT

EXCHANGER

OPTIONS

CODE

PUMP

OPTIONS

S C

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LAARS Heating Systems

All installations must be made in accordance

with:

1) In the U.S., the " National Fuel Gas Code "ANSI Z223.1/NFPA54, Latest Edition and all applicable

local codes as required by the Authorities Having Jurisdiction (AHJ), or

2) In Canada, the "Natural Gas and Propane Installation Code", CSA B149.1, latest edition and all applicable local codes as required by the AHJ.

All electrical wiring is to be done in accordance with:

1). In the U.S., the "National Electrical Code" (NEC), ANSI/NFPA 70, latest Edition and all applicable local

codes as required by the AHJ, or

2). In Canada, the “Canadian Electrical Code - Part 1”, CSA STD. C22.1 and all applicable local codes as required by the AHJ.

This appliance must be electrically grounded in accordance with the applicable codes and standards

referenced above.

1.2 ModelIdentication

Consult the rating plate on the unit. The

following information describes the model number

structure.

Model Character Designation

1-3 Model Series Designation

P N C = Pennant

4 Usage

H = Hydronic V = Volume Water

5-8 Size

0 5 0 0 = 500,000 BTU/h input 0 7 5 0 = 750,000 BTU/h input 1 0 0 0 = 999,000 BTU/h input 1 2 5 0 = 1,250,000 BTU/h input 1 5 0 0 = 1,500,000 BTU/h input 1 7 5 0 = 1,750,000 BTU/h input 2 0 0 0 = 1,999,000 BTU/h input

9 Fuel

N = Natural Gas P = Propane

10 Altitude

A = 0-10,000 feet

11 Location

C = Indoor and Outdoor

12 Firing Mode

C = On-Off

13 Revision

2 = Revision Level 2

14 Heat Exchanger

B = Glass-lined CI / copper / brz trim (std. PNCV) C = Glass-lined cast iron / copper (std. PNCH) N = Glass-lined cast iron / cu-nickel P = Glass-lined cast iron / cu-nickel / brz trim

15 Option Code

X = Standard Low Temp Control J = CSD-1, FM, IRI, IL

16 Pump Options

H = TACO, Hard water pump (PNCV only) N = TACO, Normal water pump S = TACO, Soft water pump (PNCV only) C = B&G, Hard water pump (PNCV only) B = B&G, Normal water pump D = B&G, Soft water pump (PNCV only)

1.3 Warranty

Laars Heating Systems’ appliances are covered

by a limited warranty. Owners should submit online

warranty registration at www.Laars.com.

All warranty claims must be made to an authorized Laars Heating Systems representative, directly to Customer Service, or online at www.Laars.com.

Claims must include the serial number and model (this information can be found on the rating plate),

installation date, and name of the installer. Shipping costs are not included in the warranty coverage.

Some accessory items are shipped in separate

packages. Verify receipt of all packages listed on the packing slip. Inspect everything for damage

immediately upon delivery, and advise the carrier of

any shortages or damage. Any such claims should be led with the carrier. The carrier, not the shipper, is

responsible for shortages and damage to the shipment

whether visible or concealed.

1.4 Dimensions

See Figure 1.

1.5 Locating the Appliance

The appliance should be located to provide

clearances on all sides for maintenance and inspection.

It should not be located in an area where leakage of any connections will result in damage to the area

adjacent to the appliance or to lower oors of the structure.

When such a location is not available, it is recommended that a suitable drain pan, adequately

drained, be installed under the appliance.

The appliance is design certied by CSAInternational for installation on combustible ooring; in basements; in closets, utility rooms or alcoves.

Pennant Boilers or Water Heaters must never be installed on carpeting. The location for the appliance

should be chosen with regard to the vent pipe lengths

and external plumbing. The unit shall be installed such

that the gas ignition system components are protected

from water (dripping, spraying, rain, etc.) during

operation and service (circulator replacement, control

replacement, etc.). When vented vertically, the Pennant

must be located as close as practical to a chimney or

outside wall. If the vent terminal and/or combustion

air terminal terminate through a wall, and there is potential for snow accumulation in the local area, both terminals should be installed at an appropriate level

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Low Temperature Pennant

13.7

12.4

20.24

514

FRONT VIEW

REAR VIEW

TOP VIEW

FLOW SWITCH

INLET

OUTLET

3WAY ACTUATOR

TEMPERATURE

SWITCH

PRV

(W)

LEFT SIDE VIEW

PUMP

(V)

19.7

41.5

105

35.3

29.3

7.75

13.8

13.7

RIGHT SIDE VIEW

Dimensions shown in

inches cm

Page 5

Size A B C D E F G H

500 33½ 85 15¾ 40 5¾ 15 29¾ 76 32¾ 83 7¾ 20 8¾ 22 46 117 6 15 8 20 6 15 750 45½ 11 6 21¾ 55 5¾ 15 29¾ 76 32¾ 83 7¾ 20 8¾ 22 58 147 6 15 10 25 8 20

Air

Conn.

Vent

Conn.

Horiz.

Vent Pipe

1000 57½ 146 28¾ 73 5¾ 15 29¾ 76 32¾ 83 7¾ 20 7 18 70 178 8 20 10 25 8 20 1250 68 172 34 86 101∕826 30¾ 78 29½ 75 8¾ 22 8¾ 22 80 203 8 20 12 30 8 20 1500 78½ 199 39¾ 101 101∕826 30¾ 78 29½ 75 8¾ 22 8¾ 22 91 231 8 20 12 30 8 20 1750 89 226 44½ 113 101∕826 30¾ 78 29½ 75 8¾ 22 8¾ 22 101 256 8 20 14 36 8 20 2000 99½ 253 49¾ 126 101∕826 30¾ 78 29½ 75 8¾ 22 8¾ 22 112 284 12 30 14 36 12 30

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

Figure 1. Dimensional Data.

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LAARS Heating Systems

above grade such that blockage of the terminal from

accumulated debris or precipitation is prevented.

The dimensions and requirements that are shown

in Table 1 should be met when choosing the locations

for the appliance.

1.6 Locating Pump-Mounted Water Heater with Respect to Storage Tank(s)

For best results, the Pennant water heater should

be located within 15 feet (4.6m) of the storage tank(s). The pump is sized for 30 feet (9.1m) of piping.

If the appliance must be installed with longer

piping runs, then larger diameter pipe or tubing may be

acceptable. Consult the factory for assistance.

Appliance

Surface

Left Side 1 2.5 24 61 Right Side 1 2.5 24 61 Top 1 2.5 12 30 Back 1 2.5 12** 30** Front 1 2.5 36 91 Vertical

(Category 1)

Vent Horizontal

(Category 3) Vent

*1" (2.5 cm) when b-vent is used. **When vent and/or combustion air connects to the back, recommended clearance is 36" (91cm).

Required

Clearance From

Combustible Material

inches cm inches cm

6* 15.2*

per UL 1738 venting system supplier's instructions

Table 1. Clearances.

Recommended Service Access

Clearance

1.7 Locating Pump-Mounted Boiler with Respect to Return/Supply Header

For the best results, Pennant should be located

within 15 feet (4.6m) of the supply and return headers. The pump is sized for 30 feet (9.1m) of piping.

If the appliance must be installed with longer

piping runs, then larger diameter tubing may be

acceptable. Consult the factory for assistance.

1.8 Locating Appliance for Correct Horizontal Vent/Ducted Air Distance From Outside Wall

The forced draft combustion air blower(s) in the

appliance has/have sufcient power to pull air and vent

properly when the guidelines for horizontal air and vent are followed (see Table 2).

NOTE: On some models, the vent collar size is larger than the size of the vent pipe that can be used. Vent collar size and horizontal pipe diameters can be found in Table 1. The larger vent collar size is to accommodate Category I (vertical) vent systems.

NOTE: When located on the same wall, the Pennant combustion air intake terminal must be installed a minimum of 12" (30cm) below the exhaust vent terminal and separated by a minimum of 36 inches (91cm) horizontally.

The air intake terminal must be installed high

enough to avoid blockage from snow, leaves and other

debris.

Size

500 8 20 6 15 6 15 50 15 3 CA001401 20260701

750 10 25 8 20 6 15 50 15 3 CA001401 20260701 1000 10 25 8 20 8 20 50 15 3 CA001402 20260703 1250 12 30 8 20 8 20 50 15 3 CA001403 20260703 1500 12 30 8 20 8 20 50 15 3 CA001403 20260703 1750 14 36 8 20 8 20 50 15 3 CA001403 20260703 2000 14 36 12 30 12 30 50 15 3 CA001404 20260706

Vent Collar

Size

in cm in cm in cm ft m

Horizontal

Vent Pipe

Diameter

Table 2. Horizontal Vent / Combustion Air Parameters.

Intake

Air Collar

& Pipe

Diameter

Max. Pipe

Length

Max. No.

of Elbows

Side Vent

Terminal

Part Number

Side Wall Combustion Air Terminal

Part Number

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Low Temperature Pennant

Page 7

SECTION 2. Venting and Combustion Air

WARNING

For indoor installations, as an additional measure of safety, Laars strongly recommends installation of suitable Carbon Monoxide detectors in the vicinity of this appliance and in any adjacent occupied spaces.

AVERTISSEMENT

Pour des installations intérieures, Laars recommande fortement, comme mesure de sécurité supplémentaire, l’installation de détecteurs de monoxyde de carbone adaptés dans le voisinage de l’appareil et dans chacune des pièces habitées adjacentes.

2.1 Combustion Air

Pennant boilers and water heaters must have provisions for combustion and ventilation air in accordance with the applicable sections addressing requirements for air for combustion and ventilation of

the National Fuel Gas Code, ANSI Z223.1. In Canada, the applicable sections of the Natural Gas and Propane Installation Code (CSA B149.1) must be followed. In

all cases any and all applicable local installation codes

must also be followed.

A Pennant appliance may receive combustion air from the space in which it is installed, or it can be

ducted directly to the unit from the outside. Proper ventilation air must be provided in either case.

2.1.1 Combustion Air From Room

In the United States, the most common requirements specify that the space shall communicate with the outdoors in accordance with method 1 or 2,

which follow. Where ducts are used, they shall be of

the same cross-sectional area as the free area of the

openings to which they connect.

Method 1: Two permanent openings, one commencing within 12 inches (30 cm) of the top and one commencing within 12 inches (30 cm) of

the bottom, of the enclosure shall be provided. The

openings shall communicate directly, or by ducts, with the outdoors or spaces that freely communicate

with the outdoors. When directly communicating

with the outdoors, or when communicating to the outdoors through vertical ducts, each opening shall

have a minimum free area of 1 square inch per 4000 Btu/hr (5.5 square cm/kW) of total input rating of all equipment in the enclosure. When communicating to

the outdoors through horizontal ducts, each opening shall have a minimum free area of not less than

1 square inch per 2000 Btu/hr (11 square cm/kW) of total input rating of all equipment in the enclosure.

Table 3 shows data for this sizing method, for each

Pennant model.

Method 2: One permanent opening, commencing

within 12 inches (30 cm) of the top of the enclosure,

shall be permitted. The opening shall directly

communicate with the outdoors or shall communicate through a vertical or horizontal duct to the outdoors or spaces that directly communicate with the outdoors and shall have a minimum free area of 1 square inch

per 3000 Btu/hr (7 square cm/kW) of the total input rating of all equipment located in the enclosure. This

opening must not be less than the sum of the areas of

all vent connectors in the conned space.

Other methods of introducing combustion and

ventilation air are acceptable, providing they conform to the requirements in the applicable codes listed

above.

In Canada, consult local building and safety

codes or, in absence of such requirements, follow

CSA B149.1, the Natural Gas and Propane Installation Code.

2.1.2 Intake Combustion Air

The combustion air can be taken through the

wall, or through the roof. When taken from the wall, it

must be taken from out-of-doors by means of the Laars horizontal wall terminal (see Table 2). When taken

from the roof, a eld-supplied rain cap or an elbow

arrangement must be used to prevent entry of rain water (see Figure 2).

Use single-wall galvanized pipe, per Table

4, for the combustion air intake (see Table 2 for

appropriate size). Route the intake to the heater as directly as possible. Seal all joints with tape. Provide adequate hangers. The unit must not support the weight of the combustion air intake pipe. Maximum linear pipe length allowed is 50 feet (15.2m). Three elbows have been calculated into the 50-foot (15.2m)

Size 500 125 807

750 188 1213 1000 250 1613 1250 313 2020 1500 375 2420 1750 438 2826 2000 500 3226

*Net Free Area in Square Inches / Square cm

Area indicated is for one of two openings; one at oor level

and one at the ceiling, so the total net free area could be

double the gures indicated.

This chart is for use when communicating directly with the outdoors. For special conditions and alternate methods, refer to the latest edition of ANSI Z223.1.

Note: Check with louver manufacturers for net free area of louvers. Correct for screen resistance to the net free area if a screen is installed. Check all local codes applicable to combustion air.

Table 3. Combustion Air Openings.

Square inches Square cm

Each Opening*

Page 8

LAARS Heating Systems

linear run. Subtract 10 allowable linear feet (3.0m) for

every additional elbow used (see Table 2). When fewer

than 3 elbows are used, the maximum linear pipe length allowed is still 50 feet (15.2m).

The connection for the intake air pipe is on the

lter box. Pennant appliances may have venting and combustion air ducting attached to the top or the back. They are shipped with the connections at the top. For

attaching either or both pipes to the back, the mounting

anges are reversible by removing the mounting screws and orienting the anges in the desired position. Replace the screws after positioning anges. Run a bead of silicone around the collar and slide the pipe over the collar. Secure with sheet metal screws.

In addition to air needed for combustion, air shall also be supplied for ventilation, including all air required for comfort and proper working conditions

for personnel. The Pennant loses less than 1 percent of

its input rating to the room, but other heat sources may

be present.

2.2 Venting

2.2.1 Vent Categories

Depending upon desired Pennant venting, it may

be considered a Category I or a Category III appliance.

In general, a vertical vent system will be a Category

I system. However, in rare instances, a Pennant’s

vertical vent system may be considered Category

III. In the U.S., the National Fuel Gas Code (ANSI Z223.1), or in Canada the Natural Gas and Propane Installation Code (CSA B149.1), denes a Category I

vent system, and includes rules and tables to size these

vent systems. If the Pennant’s vertical vent system

does not satisfy the criteria for Category I venting, it

must be vented as a Category III system.

All Pennant vent systems which discharge horizontally (without the use of a power venter) are

considered Category III vent systems.

(negative) 0.1 in. w.c.

If using a power venter for any type of Category

I venting, the draft should be set between (negative)

0.01 and 0.05 in. w.c.

2.2.3 Common Venting Systems

Pennant units are Category I fan-assisted when

vented vertically and adhering to all applicable codes.

Pennant units are not allowed to be vented into a common horizontal vent system, unless a properly sized vent fan is used, and the common vent system is properly designed by the vent fan manufacturer or

a qualied engineer. When common venting Pennant

fan-assisted unit with other appliances through

one shared vertical duct called a “common vent”,

special care must be taken by the installer to ensure

safe operation. In the event that the common vent

is blocked, it is possible, especially for fan-assisted devices, to vent backwards through non-operating appliances sharing the vent, allowing combustion

products to inltrate occupied spaces. If the appliances are allowed to operate in this condition, serious injury or death may occur.

WARNING

Operation of appliances with a blocked common vent may lead to serious injury or death. Safety devices must be implemented to prevent blocked common vent operation. If safe operation of all appliances connected to a common vent cannot be assured, including prevention of spillage of flue gasses into living spaces, common venting should not be applied, and appliances should each be vented separately.

2.2.2 Category I Vent

When vented as a Category I appliance, the

vent system must conform to the National Fuel Gas Code (ANSI Z223.1-Latest Edition) in the U.S., or in Canada, to the Natural Gas and Propane Installation Code (CSA B149.1 latest edition). The vent system must be sized and installed for a Category I FanAssisted Appliance.

If chimney height is greater than 25 feet, or if multiple units are vented into the same vertical vent, a barometric damper must be installed on each

appliance, such that the ue draft does not exceed

Term Description Pipe Single-wall galvanized steel pipe, 24 gauge

minimum (either insulated or non-insulated)

Joint Sealing Permanent duct tape or aluminum tape

Table 4. Required Combustion Air Piping Material.

Figure 2. Combustion Air and Vent Through Roof.

Page 9

Low Temperature Pennant

Page 9

AVERTISSEMENT

Le fonctionnement d’appareils connectés à un évent commun bouché peut provoquer de sérieuses blessures corporelles ou la mort. Des dispositifs de sécurité doivent être mis en place pour empêcher que les appareils soient utilisés avec un évent commun bouché. Si un fonctionnement sécuritaire de tous les appareils reliés à un évent commun et si la prévention des dégagements accidentels de gaz de combustion dans des zones habitées ne peuvent pas être assurés, un évent commun ne doit pas être mis en place et les appareils doivent être munis d’évents individuels séparés.

It is for this reason that, in addition to

following proper vent sizing, construction and safety

requirements from the National Fuel Gas Code, ANSI Z223.1 or in Canada, from the Natural Gas and Propane Installation Code (CSA B149.1) as well as

all applicable local codes, it is required that installers provide some means to prevent operation with a

blocked common vent. It is suggested that a blocked

vent safety system be employed such that if the switch

from one appliance trips due to excessive stack spill

or back pressure indicating a blocked vent condition, that all appliances attached to the vent be locked out

and prevented from operating. Note that the Pennant

is equipped with a blocked vent safety (pressure)

switch, as shipped. However, this safety switch has

only been designed and tested to be effective in installations where the Pennant is vented separately

and NOT common vented with other appliances. As an

additional precaution, it is recommended that a Carbon

Monoxide (CO) alarm be installed in all enclosed spaces containing combustion appliances. If assistance

is required in determining how a blocked vent safety

system should be connected to a LAARS product, please call Applications Engineering at the Rochester phone number on the back cover of this manual.

Refer to the installation and operating

instructions on all appliances to be common vented for instructions, warnings, restrictions and safety

requirements. If safe operation of all appliances

connected to a common vent cannot be assured,

including prevention of spillage of ue gases into

living spaces, common venting should not be applied,

and appliances should each be vented separately.

2.2.4 Category III Vent

When the Pennant is vented with horizontal discharge, it must be installed per this installation manual and the venting system manufacturer’s

installation instructions. The vent system must be

sealed stainless steel, per Table 5.

Route the vent pipe to the heater as directly as possible. Seal all joints and provide adequate hangers

as required in the venting system manufacturer’s

installation instructions. Horizontal portions of the

venting system must be supported to prevent sagging and may not have any low sections that could trap

condensate.

The unit must not support the weight of the vent

pipe. Horizontal runs must slope downwards not less than ¼ inch per foot (2 cm/m) from the unit to the vent terminal.

L’appareil ne doit pas supporter le poids de la gaine d’évent. Les parties horizontales doivent être installées avec une pente de 2 cm/m (1/4 inch par pied) descendant de l’appareil vers la sortie de l’évent.

Reference Table 2 for the size of the Category III vent system. Up to three elbows can be used with 50 linear feet (15.2m) of pipe. Subtract 10 allowable linear feet (3.0m) for every additional elbow used.

2.3 Locating Vent & Combustion Air

Terminals

2.3.1 Side Wall Vent Terminal

The appropriate Laars side wall vent terminal must be used, and is listed in the installation and

operation manual. The terminal provides a means of

installing the vent piping through the building wall,

and must be located in accordance with ANSI Z223.1/ NFPA 54 and applicable local codes. In Canada, the installation must be in accordance with CSA B149.1 and local applicable codes. Consider the following

when installing the terminal:

1. Figure 3 shows the requirements for mechanical

vent terminal clearances for the U.S. and Canada.

2. Locate the vent terminal so that vent gases cannot

be drawn into air conditioning system inlets.

3. Locate the vent terminal so that vent gases cannot

enter the building through doors, windows,

gravity inlets or other openings. Whenever

possible, locations under windows or near doors

should be avoided.

4. Locate the vent terminal so that it cannot be

blocked by snow. The installer may determine

that a vent terminal must be higher than the

minimum shown in codes, depending upon local

conditions.

5. Locate the terminal so the vent exhaust does

not settle on building surfaces or other nearby

objects. Vent products may damage such surfaces

or objects.

6. If the boiler or water heater uses ducted

combustion air from an intake terminal located

on the same wall, locate the vent terminal at least

Term Description

Pipe Must comply with UL Standard 1738 such

as Type AL29-4C Stainless Steel (either insulated or non-insulated).

Joint

Sealing

Table 5. Required Horizontal Venting Material.

Follow vent manufacturer's instructions.

Page 10

LAARS Heating Systems

U.S. Installations (see note 1) Canadian Installations (see note 2)

A= Clearance above grade, veranda, porch, 12 inches (30 cm) 12 inches (30 cm) deck, or balcony

B= Clearance to window or door that may Direct Vent Only: 12 inches (30 cm)

be opened Other Than Direct Vent: 4 feet (1.2 m) below or 36 inches (91 cm) to side of opening; 1 foot (30 cm) above opening

C= Clearance to permanently closed window See note 4 See note 5 D= Vertical clearance to ventilated soffit located

above the terminal within a horizontal See note 4 See note 5 distance of 2 feet (61cm) from the center line of the terminal

E= Clearance to unventilated soffit See note 4 See note 5 F= Clearance to outside corner See note 4 See note 5 G= Clearance to inside corner See note 4 See note 5 H= Clearance to each side of center line See note 4 3 feet (91 cm) within a height 15 feet

extended above meter/regulator assembly above the meter/regulator assembly

I= Clearance to service regulator vent outlet See note 4 3 feet (91 cm) J= Clearance to non mechanical air supply Direct Vent Only: 12 inches (30 cm)

inlet to building or the combustion air inlet Other Than Direct Vent: 4 feet (1.2 m) below or 36 inches (91 cm) to any other appliance to side of opening; 1 foot (30 cm) above opening

K= Clearance to a mechanical air supply inlet 3 feet (91 cm) above if within 10 feet (3 m) 6 feet (1.83 m) horizontally

L= Clearance above paved sidewalk or paved Vent termination not allowed in this location Vent termination not allowed in this driveway located on public property location

M= Clearance under veranda, porch, deck, See note 4 12 inches (30 cm) (see note 3) or balcony

Notes:

1. In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code.

2. In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.

3. Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.

4. For clearances not specified in ANSI Z223.1 / NFPA 54, clearance is in accordance with local installation codes and the requirements of the gas supplier.

5. For clearances not specified in CSA B149.1, clearance is in accordance with local installation codes and the requirements of the gas supplier.

Figure 3. Vent Terminal Clearances.

Page 11

Low Temperature Pennant

Page 11

3 feet (0.9m) horizontally from the combustion

air terminal, and locate the vent terminal at least

1 foot (0.3m) above the combustion air terminal.

WARNING

The outdoor vent terminal gets hot. Unit must be installed in such a way as to reduce the risk of burns from contact with the vent terminal.

AVERTISSEMENT

La sortie d’évent à l’extérieur devient très chaude. Elle doit être installée de façon à réduire le risque de brûlures au contact de l’extrémité de l’évent.

Important Note: Massachusetts Code Requirement.

From Massachusetts Rules and Regulations 248 CMR 5.08:

(a) For all side wall horizontally vented gas

fueled equipment installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or operated by the Commonwealth and where the side wall exhaust vent termination

is less than seven (7) feet above nished grade

in the area of the venting, including but not limited to decks and porches, the following

requirements shall be satised:

1. INSTALLATION OF CARBON MONOXIDE DETECTORS.

At the time of installation of the side wall

horizontal vented gas fueled equipment, the

installing plumber or gastter shall observe that a hard-wired carbon monoxide detector with

an alarm and battery back-up is installed on

the oor level where the gas equipment is to be installed. In addition, the installing plumber or gastter shall observe that a battery operated or hard-wired carbon monoxide detector with an

alarm is installed on each additional level of the dwelling, building or structure served by the side

wall horizontal vented gas fueled equipment.

It shall be the responsibility of the property

owner to secure the services of qualied licensed

professionals for the installation of hard-wired

carbon monoxide detectors. a. In the event that the side wall

horizontally vented gas fueled equipment is installed in a crawl space or an attic, the

hard-wired carbon monoxide detector with

alarm and battery back-up may be installed

on the next adjacent oor level.

b. In the event that the requirements of

this subdivision cannot be met at the time of completion of installation, the owner shall have a period of thirty (30) days to comply

with the above requirements; provided,

however, that during said thirty (30) day

period, a battery operated carbon monoxide detector with an alarm shall be installed.

2. APPROVED CARBON MONOXIDE DETECTORS.

Each carbon monoxide detector as required

in accordance with the above provisions shall

comply with NFPA 720 and be ANSI/UL 2034 listed and IAS certied.

3. SIGNAGE.

A metal or plastic identication plate shall be

permanently mounted to the exterior of the

building at a minimum height of eight (8) feet

above grade directly in line with the exhaust vent

terminal for the horizontally vented gas fueled

heating appliance or equipment. The sign shall

read, in print size no less than one-half (½) inch

in size, “GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS”.

4. INSPECTION.

The state or local gas inspector of the side

wall horizontally vented gas fueled equipment shall not approve the installation unless, upon inspection, the inspector observes carbon

monoxide detectors and signage installed in accordance with the provisions of 248 CMR

5.08(2)(a) 1 through 4.

(b) EXEMPTIONS: The following equipment is

exempt from 248 CMR 5.08(2)(a) 1 through 4:

1. The equipment listed in Chapter 10 entitled “Equipment Not Required To Be Vented” in the most current edition of NFPA 54 as adopted by the Board; and

2. Product Approved side wall horizontal vented gas

fueled equipment installed in a room or structure separate from the dwelling, building or structure

used in whole or in part for residential purposes.

GAS EQUIPMENT VENTING SYSTEM PROVIDED. When the manufacturer of Product Approved side wall horizontally vented gas equipment provides a venting system design or venting system components with the equipment, the instructions provided by the manufacturer for installation of the equipment and the venting system shall

include:

1. Detailed instructions for the installation of the

venting system design or the venting system

components; and

2. A complete parts list for the venting system

Page 12

LAARS Heating Systems

design or venting system.

(d) MANUFACTURER REQUIREMENTS –

GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED. When the manufacturer of a Product Approved side wall horizontally vented gas fueled equipment does not provide the parts for venting the fuel gases,

but identies “special venting systems”, the following requirements shall be satised by the manufacturer:

1. The referenced “special venting system”

instructions shall be included with the appliance

or equipment installation instructions; and

2. The “special venting systems” shall be Product Approved by the Board, and the instructions for

that system shall include a parts list and detailed

installation instructions.

(e) A copy of all installation instructions for all

Product Approved side wall horizontally vented gas fueled equipment, all venting instructions, all parts lists for venting instructions, and/or all venting design instructions shall remain with the appliance or equipment at the completion of the installation.

2.3.2 Side Wall Combustion Air Terminal

The Laars side wall combustion air terminal

(listed in Table 2) must be used when the unit takes

its combustion air through a duct from a side wall.

Consider the following when installing the terminal:

1. Do not locate the air inlet terminal near a source of corrosive chemical fumes (e.g., cleaning uid, chlorinated compounds, etc.)

2. Locate the terminal so that it will not be subject to damage by accident or vandalism.

3. Locate the combustion air terminal so that it cannot be blocked by snow. The National Fuel Gas Code requires that it be at least 12 inches (30

cm) above grade, but the installer may determine it should be higher, depending upon local

conditions.

4. If the Pennant is side-wall vented to the same

wall, locate the vent terminal at least 3 feet

(0.9m) horizontally from the combustion air

terminal, and locate the vent terminal at least 1

foot (0.3m) above the combustion air terminal

(see Figure 3).

2.3.3 Vertical Vent Terminal

When the unit is vented through the roof, the

vent must extend at least 3 feet (0.9m) above the point at which it penetrates the roof. It must extend at least 2 feet (0.6m) higher than any portion of a building within a horizontal distance of 10 feet (3.0m), and high

enough above the roof line to prevent blockage from

snow. When the combustion air is taken from the roof, the combustion air must terminate at least 12" (30cm)

below the vent terminal (see Figure 2).

2.3.4 Vertical Combustion Air Terminal

When combustion air is taken from the roof, a

eld-supplied rain cap or an elbow arrangement must

be used to prevent entry of rain water (see Figure 2). The opening on the end of the terminal must be at least

12" (30cm) above the point at which it penetrates the

roof, and high enough above the roof line to prevent

blockage from snow. When the vent terminates on the roof, the combustion air must terminate at least 12" (30cm) below the vent terminal.

2.4 Common Vent Test — Boilers

When an existing boiler is removed from a

common venting system, the common venting system is likely to be too large for proper venting of the

appliances remaining connected to it.

At the time of removal of an existing boiler, the

following steps shall be followed with each appliance remaining connected to the common venting system placed in operation, while the other appliances remaining connected to the common venting system

are not in operation.

1. Seal any unused openings in the common venting system.

2. Visually inspect the venting system for proper

size and horizontal pitch and determine there is non blockage or restriction, leakage, corrosion

and other deciencies which could cause an unsafe condition.

3. Insofar as it is practical, close all building doors

and windows and all doors between the space in which the appliances remaining connected to the common venting system are located and other

spaces of the building. Turn on clothes dryers

and any appliance not connected to the common

venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan. Close replace dampers.

4. Place in operation the appliance being inspected. Follow the lighting instructions.

Adjust thermostat so appliance will operate

continuously.

5. Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use the ame of a match or candle, or smoke from a cigarette, cigar or pipe.

6. After it has been determined that each appliance

remaining connected to the common venting system properly vents when tested as outlined

above, return doors, windows, exhaust fans, replace dampers and any other gas burning appliance to their previous conditions of use.

7. Any improper operation of the common venting

system should be corrected so that the installation

Page 13

Low Temperature Pennant

Page 13

conforms with the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CSA B149.1, Natural Gas and Propane Installation Codes.

When resizing any portion of the common venting system, the common venting system should be resized to approach the minimum size as determined using the appropriate tables in

Appendix F in the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CSA B149.1, Natural Gas and Propane Installation Codes.

2.4 Véricationdeséventscommuns— Chaudières

Lorsqu’une chaudière existante est déconnectée

du réseau d’évents commun, ce réseau d’évents commun devient probablement trop grand pour les appareils qui lui restent connectés. Lorsqu’une chaudière existante est retirée, les étapes suivantes doivent être accomplies pour chaque appareil qui reste connecté au réseau d’évents commun utilisé, alors que les autres appareils qui sont encore connectés au réseau commun d’évents ne sont pas en fonctionnement.:

1. Sceller toutes les ouvertures non utilisées du système d'évacuation.

2. Inspecter de façon visuelle le système d'évacuation pour déterminer la grosseur et l'inclinaison horizontale qui conviennent et s'assurer que le système est exempt d'obstruction, d'étranglement, de fuite, de corrosion et autres défaillances qui pourraient présenter des risques.

3. Dans la mesure du possible, fermer toutes les portes et les fenêtres du bâtiment et toutes les portes entre l'espace où les appareils toujours raccordés au système d'évacuation sont installés et les autres espaces du bâtiment. Mettre en marche les sécheuses, tous les appareils non raccordés au système d'évacuation common et tous les ventilateurs d'extraction comme les hottes de cuisinière et les ventilateurs des salles de bain. S'assurer que ces ventilateurs fonctionnent à la vitesse maximale. Ne pas faire fonctionner les ventilateurs d'été. Fermer les registres des cheminées.

4. Mettre l'appareil inspecté en marche. Suivre les instructions d'allumage. Réegler le thermostat de façon continue.

5. Faire fonctionner le brûleur principal pendant 5 min ensuite, déterminer si le coupe-tirage déborde à l'ouverture de décharge. Utiliser la

amme d'une allumette ou d'une chandelle ou la

fumée d'une cigarette, d'un cigare ou d'une pipe.

6. Une fois qu'il a été déterminé, selon la méthode indiquée ci-dessus, que chaque appareil raccordé au système d'évacuation est mis à l'air libre de façon adéquate. Remettre les portes et les fenêtres, les ventilateurs, les registres de cheminées et les appareils au gaz à leur position originale.

7. Tout mauvais fonctionnement du système d'évacuation commun devrait être corrigé de façon que l'installation soit conforme au National Fuel Gas Code, ANSI Z223.1/NFPA 54 et (ou) aux codes d'installation CSA-B149.1. Si la grosseur d'une section du système devrait

être modié, le système devrait être modié pour

respecter les valeurs minimales des tableaux pertinents de l'appendice F du National Fuel Gas Code, ANSI Z223.1/NFPA 54 et (ou) les codes d'installation CSA-B149.1

2.5 Vent Terminals for Outdoor Units

For outdoor applications, the vent and

combustion air openings must be covered with proper terminals to prevent rain, snow and other objects from

falling into the Pennant.

If local codes allow, outdoor installations may

use 1' (one foot) of appropriately sized galvanized

single wall or type "B" vent and a rain cap for exhaust vent termination in the default conguration (venting out of the top). An appropriately sized 90° elbow,

positioned with the opening facing down, may be used

on the combustion air inlet in the default conguration on the back of the unit. Note that some local codes may require a higher vertical vent height, extending above any perimeter fencing, etc. In installations

where the appearance of the vent is objectionable, the

low prole vent terminals listed in Table 6 may be used.

Part numbers for the low prole terminals to

cover the vent and combustions air openings are shown in Table 6.

Size Outdoor

Vent

Terminal 500 20254703 D2007900 750 20254705 D2007900

1000 20254705 D2008000 1250 D2007700 D2008000 1500 D2007700 D2008000 1750 D2007800 D2008000 2000 D2007800 D2008200

Table 6. Vent Terminals for Outdoor Units.

Outdoor Combustion Air Terminal

Page 14

LAARS Heating Systems

SECTION 3. Gas Supply and Piping

3.1 Gas Supply and Piping

Gas piping should be supported by suitable

hangers or oor stands, not by the appliance.

The Pennant’s gas train allows the user to pipe

the gas from either the right side or the left side of

the unit. As shipped, the right side of the gas train is capped off, and there is a manual valve on the left side.

If desired, the manual valve on the left side of the gas train may be moved to the right side, and the cap on

the right side may be moved to the left.

Review the following instructions before

proceeding with the installation.

1. Verify that the appliance is tted for the proper type of gas by checking the rating plate. Pennant

appliances are equipped to operate at elevations

up to 10,000 feet (3050m). Pennant appliances

may be adjusted to operate properly at altitudes above 2500 feet (see Section 6.5.2) and the input will be reduced if the heating value of the gas

supply is below sea level values.

2. The maximum inlet gas pressure must not exceed 13" w.c. (3.2kPa). The minimum inlet gas pressure is 5 in. w.c. (1.2 kPa).

3. Refer to Table 7, size supply.

4. Run gas supply line in accordance with all applicable codes.

5. Locate and install manual shutoff valves in accordance with state and local requirements.

6. A sediment trap must be provided upstream of the gas controls.

7. All threaded joints should be coated with piping compound resistant to action of liqueed petroleum gas.

8. The appliance and its individual shutoff valve

must be disconnected from the gas supply piping during any pressure testing of that system at test

pressures in excess of 0.5 psig (3.45 kpa).

9. The unit must be isolated from the gas supply

system by closing its individual manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or

less than 0.5 psig (3.45 kpa).

10. The appliance and its gas connection must be leak tested before placing it in operation.

11. Purge all air from gas lines.

WARNING

Do not use open flame to check for leaks. An open flame could lead to explosion, which could result in property damage, serious injury or death.

AVERTISSEMENT

Ne recherchez pas les fuites avec une flamme nue. Une flamme nue peut provoquer une explosion qui peut causer des dommages matériels, de sérieuses blessures corporelles ou la mort.

NOTE: The Pennant appliance and all other gas appliances sharing the gas supply line must be firing at maximum capacity to properly measure the inlet supply pressure. The pressure can be measured at the supply pressure port on the gas valve. Low gas pressure could be an indication of an undersized gas meter, undersized gas supply lines and/or an obstructed gas supply line.

Distance from Gas Meter or Last Stage Regulator

Size and

Gas Type 0-100'

500 natural 1½" 3.8 cm 2" 5.1 cm 2" 5.1 cm 500 propane 1" 2.5 cm 1½" 3.8 cm 1½" 3.8 cm 750 natural 2" 5.1 cm 2" 5.1 cm 2½" 6.4 cm 750 propane 1½" 3.8 cm 1½" 3.8 cm 2" 5.1 cm 1000 natural 2" 5.1 cm 2½" 6.4 cm 3" 7.6 cm 1000 propane 1½" 3.8 cm 2" 5.1 cm 2½" 6.4 cm 1250 natural 2½" 6.4 cm 2½" 6.4 cm 3" 7.6 cm 1250 propane 2" 5.1 cm 2" 5.1 cm 2½" 6.4 cm 1500 natural 2½" 6.4 cm 3" 7.6 cm 3" 7.6 cm 1500 propane 2" 5.1 cm 2½" 6.4 cm 2½" 6.4 cm 1750 natural 2½" 6.4 cm 3" 7.6 cm 3" 7.6 cm 1750 propane 2" 5.1 cm 2½" 6.4 cm 2½" 6.4 cm 2000 natural 3" 7.6 cm 3" 7.6 cm 3½" 8.9 cm 2000 propane 2½" 6.4 cm 2½" 6.4 cm 3" 7.6 cm

Notes:

1. These gures are based on 1/2" (0.12 kPa) water column pressure drop.

2. Check supply pressure and local code requirements before proceeding with work.

3. Pipe ttings must be considered when determining gas pipe sizing.

0-31 m 100-200' 31-61m 200-300' 61-91m

Table 7. Gas Piping Size.

Page 15

Low Temperature Pennant

SENSOR

VALV E

THERMOMETER

SENSOR

TEMPERATURE

GLOBE VALV E

CHECK VALV E

W/ FAST FILL BYPASS

PRESSURE REDUCING VALV E

WITH AIR SCOOP AND AUTO AIR VENT

EXPANSION TANK

3-WAY VALVE

VALV E

PURGE

PUMP

ADDITIONAL REQUIREMENTS.

WITH LOCAL CODES AND ORDINANCES FOR

PIPING CONFIGURATION AND VA LVING, CHECK

WARNING: THIS DRAWING SHOWS SUGGESTED

INSTALLAIR VENTS AT HIGH POINTS IN SYSTEM.

PIPING&SIZING OF EXPANSION TANK PER TANK MANUFACTURER'S INSTRUCTIONS.

PRIMARY/SECONDARY MANDATORY FOR ALL VARIABLE FLOW SYSTEMS.

BOILER WATER CONNECTIONS (INLET/OUTLET) MAYVARY. VERIFY CONNECTION ORIENTATION.

BOILER CIRCUIT PIPING MUST BE EQUAL BOILER WATER CONNECTION SIZE.

DIMENSION "C" TO BE4PIPE DIAMETERS.

DOTTED DEVICES INDICATE ALTERNATE LOCATIONS.

TEMPERATURE SENSORS REQUIRE FIELD INTERLOCK TO BOILER CONTROLS.

COMBINED FLOW OF ALL BOILERS.

COMMON PIPING MUST BE SIZED FOR

BOILER CIRC. PUMP SIZED FOR FLOW THROUGH BOILER AND 30 FEET OF FULL-SIZED PIPING.

MINIMUM INLET WATER TEMP = 70°F

LEGEND

Cold Water

Make-Up

Pump

System

Supply

System

Return

3-Way Valve

Mounted on Pennant

Pump Mounted

on Pennant

System Return

PRIMARY/SECONDARY MANDATORY FOR ALL VARIABLE FLOW SYSTEMS.

INSTALLAIR VENTS AT HIGH POINTS IN SYSTEM.

PIPING&SIZING OF EXPANSION TANK PER TANK MANUFACTURER'S INSTRUCTIONS.

COMMON PIPING MUST BE SIZED FOR COMBINED FLOW OF ALL BOILERS.

BOILER WATER CONNECTIONS (INLET/OUTLET) MAYVARY. VERIFY CONNECTION ORIENTATION.

BOILER CIRCUIT PIPING MUST BE EQUAL BOILER WATER CONNECTION SIZE.

BOILER CIRC. PUMP SIZED FOR FLOW THROUGH BOILER FULL-SIZED PIPING.

DIMENSION "C" TO BE4PIPE DIAMETERS. MINIMUM INLET WATER TEMP = 70°F

DOTTED DEVICES INDICATE ALTERNATE LOCATIONS.

TEMPERATURE SENSORS REQUIRE FIELD INTERLOCK TO BOILER CONTROLS.

AND 30 FEET OF

WARNING: THIS DRAWING SHOWS SUGGESTED PIPING CONFIGURATION AND VALVING, CHECK WITH LOCAL CODES AND ORDINANCES FOR ADDITIONAL REQUIREMENTS.

System

Pump

Cold Water

Make-Up

3-Way Valve

Mounted on Pennant

System

Supply

Page 15

THERMOMETER

TEMPERATURE

Figure 4. Suggested Piping - Hydronic Boiler.

GLOBE VA LV E

CHECK VA LV E

LEGEND

PRESSURE REDUCING VA LVE W/ FAST FILL BYPASS

PURGE

Pump Mounted

3-WAY VALV E

VALV E

on Pennant

EXPANSION TANK WITH AIR SCOOP AND AUTO AIR VENT

PUMP

Figure 5. Hydronic Piping — One Boiler, Multi-Temperature System.

Page 16

LAARS Heating Systems

SECTION 4A. Water Connections — Pennant Boiler

4A.1 Heating System Piping:

Hot Supply Connections — Boiler

NOTE: This appliance must be installed in a closed

pressure system with a minimum of 12 psig (82.7 kPa) static pressure at the boiler.

Hot water piping should be supported by suitable

hangers or oor stands. Do not support piping with this appliance. Due to expansion and contraction of

copper pipe, consideration should be given to the type

of hangers used. Rigid hangers may transmit noise

through the system resulting from the piping sliding in

the hangers. It is recommended that padding be used when rigid hangers are installed. Maintain 1" clearance to combustibles for hot water pipes.

Pipe the discharge of the relief valve (full size)

to a drain or in a manner to prevent injury in the event

of pressure relief. Install an air purger, an air vent, a diaphragm-type expansion tank, and a hydronic ow check in the system supply loop. Minimum ll pressure must be 12 psig (82.7 kPa). Install shutoff valves where required by code.

See suggested piping diagrams (Figures 4-5).

These diagrams are meant only as a guide. Com ponents required by local codes must be properly installed.

Note the recommended location of the

temperature sensor on the diagrams; you must provide

a location for the additional sensor shipped with the

Pennant. This sensor may be strapped onto pipe from 1" to 4" diameter, or inserted into an immersion well.

4A.2 Cold Water Make-Up — Boiler

1. Connect the cold water supply to the inlet connection of an automatic ll valve.

2. Install a suitable back ow preventer between the automatic ll valve and the cold water supply.

3. Install shut off valves where required.

NOTE: The boiler, when used in connection with a refrigeration system, must be installed so the chilled medium is piped in parallel with the boiler with appropriate valves to prevent the chilled medium from entering the boiler.

The boiler piping system of a hot water heating

boiler connected to heating coils located in air

handling appliances where they may be exposed to refrigerated air circulation must be equipped with ow

control valves or other automatic means to prevent gravity circulation of the boiler water during the

cooling cycle.

A boiler installed above radiation level, or as

required by the authority having jurisdiction, must be provided with a low water cutoff device either as a part

of the boiler or at the time of boiler installation.

4A.3 Water Flow Requirements — Boiler

Low Temperature Pennant Boilers are equipped

with a mounted pump. The pumps are sized for the

boiler’s head loss and 30 feet of full-size piping (same

size as boiler outlet), with a normal number of ttings.

The boilers must be piped in a primary-secondary sys-

tem, such that the boiler’s pump only serves the boiler.

Figures 4 and 5 show examples of this type of piping.

The minimum inlet water temperature to the

Pennant is 70°F (20°C). The mixing system on the Pennant will ensure that the heat exchanger in the Pennant does not see water that is less than 120°F (49°C), so that excessive condensation does not form on the heat exchanger.

Table 8 shows a relationship between water ow

through the boiler and the temperature difference (rise)

between the inlet and outlet of the boiler. This table

will enable the user to test the boiler for proper water

ow. Since the boiler has a mixing system that sends

a portion of the hot water from the boiler outlet to the

boiler inlet, the water ow coming out of the mixing

system will vary, depending on the return water

temperature.

4A.4 Freeze Protection — Boiler

Boiler installations are not recommended in areas where the danger of freezing exists unless proper precautions are made for freeze protection. A non toxic, heating system, anti-freeze may be added to the

hydronic system provided that the concentration does

not exceed 50% and the anti freeze contains an anti foamant. Power outage, interruption of gas supply,

failure of system components, activation of safety

devices, etc., may prevent a boiler from ring. Any time a boiler is subjected to freezing conditions,

and the boiler is not able to re, and/or the water

is not able to circulate, there is a risk of freezing in the boiler or in the pipes in the system. When water

freezes, it expands. This can result in bursting of pipes

in the system, or damage to the boiler, which could

result in leaking or ooding conditions.

IMPORTANT NOTES: Different glycol products may provide varying degrees of protection. Glycol products must be maintained properly in a heating system, or they may become ineffective. Consult the glycol specifications, or the glycol manufacturer, for information about specific products, maintenance of solutions, and set up according to your particular conditions. Never use ethylene glycol (automotive antifreeze).

Size 20°F (11°C) 25°F (14°C) 30°F (17°C) 35°F (19°C)

gpm lpm gpm lpm gpm lpm gpm lpm

500 43 161 34 129 26 107 24 92

750 64 241 51 193 43 161 36 138 1000 85 321 68 257 57 214 49 184 1250 106 401 85 322 71 269 61 231 1500 128 483 102 386 85 322 73 276 1750 N/R N/R 11 9 451 99 375 85 322 2000 N/R N/R 103 515 113 429 97 368

Notes: gpm = gallons per minute, lpm = liters per minute, Maximum temperature rise is 35°F (19°C), as shown. N/R = not recommended.

Table 8. Temperature Rise - Boiler.

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Low Temperature Pennant

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SECTION 4B. Water Connections — Pennant Water Heater

4B.1 Water System Piping — Water Heater

Hot water piping should be supported by suitable

hangers or oor stands. Do not support piping with this appliance. Due to expansion and contraction of

copper pipe, consideration should be given to the type

of hangers used. Rigid hangers may transmit noise

through the system resulting from the piping sliding in

the hangers. It is recommended that padding be used when rigid hangers are installed.

The Pennant can be used with several different

types of readily available storage tanks. Pennant units have a circulating pump built into the water heater.

The pumps used are sized for the head loss through the

heater, plus 30 feet (9.1 m) of full-sized piping (same size as boiler outlet) and a normal number of ttings.

Pumps used are sized for soft, normal or hard water, so make sure the unit matches the water quality of the

installation.

Pipe the outlet from the heater’s relief valve such that any discharge from the relief valve will be conducted to a suitable place for disposal when relief

occurs. Do not reduce line size or install any valves in this line. The line must be installed to allow complete drainage of both the valve and the line.

Suggested piping diagrams are shown in Figures

6,7,8 and 9. These diagrams are meant only as a guide.

Components required by local codes must be properly

installed.

Note the recommended location of the temperature sensor on the diagrams. The Pennant is

shipped with an additional sensor that can be used in

the storage tank, in lieu of a separate tank thermostat.

The minimum inlet water temperature for the

Low-Temp Pennant is 70°F (20°C). The mixing

system on the Pennant will ensure that the heat

exchanger in the Pennant does not see water that is less than 120°F (49°C), so that excessive condensation does not form on the heat exchanger.

4B.2 Hot Water Supply Piping — Water Heater

Follow the tank manufacturer’s guidelines for completion of the hot water system connections.

NOTE: A listed temperature and pressure relief valve listed as complying with the Standard for Relief Valves and Automatic Gas Shutoff Devices for Hot Water Supply Systems (ANSI Z21.22/ CSA 4.4), of suitable discharge capacity must be installed in the separate storage tank system.

If the Pennant water heater is installed in a closed

water supply system, such as one having a backow

preventer in the cold water supply line, the relief valve

may discharge periodically, due to thermal expansion. Means (such as a properly-sized expansion tank) shall be provided to control thermal expansion. Contact the

water supplier or local plumbing inspector on how to

control this situation.

4B.3 Water Flow Requirements — Water Heater

In a water heating application (an open system),

new water is constantly being introduced. With the

new water comes a fresh supply of minerals that can

be deposited on the unit’s heat exchanger. This is commonly known as scaling. The amount of minerals will depend upon the hardness of the water. Water can

also be aggressive, and can erode metals, including

copper, if the water is moved too quickly. The water ow requirements for the Pennant water heater are based upon the hardness of the water. The water ow

is kept high enough to prevent scaling, but low enough

to prevent tube erosion. For extremely soft or hard water, cupro-nickel tubes are available. Contact a

Laars representative if you have questions or concerns

about water quality.

Pennant water heaters are built with a mounted

pump that is sized for soft, normal or hard water. The

pumps used are sized for the head loss through the

heater, plus 30 feet (9.1m) of full-sized piping (same size as heater outlet) and a normal number of ttings.

Table 9 species water ow rates for water

heaters, which will enable the user to ensure that the

Pennant is getting the correct water ow when it is in operation.

4B.4 Combined Water Heating (potable)

and Space Heating — Water Heater

NOTE: Combined systems must be allowed by and

installed per local codes.

Piping and components connected to this water

heater for the space heating application shall be

suitable for use with potable water.

Toxic chemicals, such as used for boiler

treatment, shall not be introduced into the potable

water used for space heating.

This water heater when used to supply potable water shall not be connected to any heating system or component(s) previously used with a non-potable

water heating appliance.

When the system requires water for heating at temperatures higher than required for other uses, an anti-scald mixing or tempering valve shall be installed to temper the water for those uses in order to reduce scald hazard potential.

4B.5 Freeze Protection — Water Heater

Although Pennant water heaters are design-

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certied for outdoor installations, such installations

are not recommended in areas subject to freezing

temperatures, unless proper precautions are taken.

Power outage, interruption of gas supply, failure

of system components, activation of safety devices,

etc., may prevent a heater from ring. Any time a heater is subjected to freezing conditions, and the

heater is not able to re, and/or the water is not

able to circulate, there is a risk of freezing in the heater or in the pipes in the system. When water

freezes, it expands. This can result in bursting of pipes

in the system, or damage to the heater, which could

result in leaking or ooding conditions.

Contact the local factory representative or Laars

for additional information.

Size

500 45 68 90 19 13 9 170 257 341 10 7 5

750 45 68 90 28 19 14 170 257 341 16 10 8 1000 45 68 90 38 25 19 170 257 341 21 14 10 1250 68 68 90 31 31 24 257 257 341 17 17 13 1500 68 68 90 38 38 28 257 257 341 21 21 16 1750 68 68 90 44 44 33 257 257 341 24 24 18 2000 112 112 112 30 30 30 424 424 424 17 17 17

Notes:

Soft Water = 1 to 7.5 grains hardness Normal Water = 7.6 to 17 grains hardness

GPM Water Flow Temperature Rise °F LPM Water Flow Temperature Rise °C

Soft Normal Hard Soft Normal Hard Soft Normal Hard Soft Normal Hard

Hard Water = more than 17 grains hardness GPM = gallons per minute LPM = liters per minute

Table 9. Temperature Rise — Water Heater.

Figure 6. Suggested Piping — One Water Heater, One Tank.

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Low Temperature Pennant

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Figure 7. Suggested Piping — Multiple Water Heaters, One Tank.

Figure 8. Suggested Piping — One Water Heater, Multiple Tanks.

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LAARS Heating Systems

Figure 9. Suggested Piping — Multiple Water Heaters, Multiple Tanks.

SECTION 5. Electrical Connections

WARNING

The appliance must be electrically grounded in accordance with the requirements of the authority having jurisdiction or, in the absence of such requirements, with the latest edition of the National Electrical Code, ANSI/NFPA 70, in the U.S. and with latest edition of CSA C22.1 Canadian Electrical Code, Part 1, in Canada. Do not rely on the gas or water piping to ground the metal parts of the boiler. Plastic pipe or dielectric unions may isolate the boiler electrically. Service and maintenance personnel, who work on or around the boiler, may be standing on wet floors and could be electrocuted by an ungrounded boiler.

L’appareil doit être relié à la terre conformément aux exigences de la réglementation locale ou, en l’absence d’une telle réglementation, à la plus récente édition du National Electrical Code (Code national de l’électricité) ANSI/NFPA 70 aux ÉtatsUnis, et à la plus récente édition du Code Canadien de l’électricité 1 Code Part 1) CSA C22.1, au Canada. N’utilisez pas les tuyauteries d’eau ou de gaz pour mettre à la terre les pièces métalliques de la chaudière; des tuyauteries en plastique ou des raccords union diélectriques peuvent isoler électriquement la chaudière. Les employés qui sont appelés à travailler sur la chaudière ou autour peuvent être électrocutés par une chaudière qui n’est pas mise à la terre.

AVERTISSEMENT

ère

partie (Canadian Electrical

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Low Temperature Pennant

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Single pole switches, including those of safety

controls and protective devices must not be wired in a

grounded line.

All electrical connections are made in the eld

wiring terminal strip, which is located to the left of the

blower.

NOTE: All internal electrical components have been pre-wired. No attempt should be made to connect electrical wires to any other location except the wiring box.

5.1 Main Power

5.1.1 Sizes 500-1500

Pennant sizes 500-1500 use a single 120-volt

fused supply. The installer can change the single

service heaters to use a separate circuit for the pump, if

desired. Instructions to make this change are found in

Section 5.1.3.

Pennant 500-1500 main power (L1, N1 & Ground) shall be connected to the three wires (10 AWG) supplied. Over-current protection ratings can be

found in Table 10.

5.1.2 Sizes 1750-2000

Pennant sizes 1750-2000 require two 120-volt fused supplies.

Heater circuit can be identied with 10AWG

wires to include black, white and green (all solid

colors). Pump circuit can be identied with three 12AWG wires to include a black wire with a white tracer (stripe), a white and green wire.

5.1.3 Separate Pump Circuit

Conversion to separate pump circuit will necessitate removing the three jumpers within the internal wiring of the 120-volt portion of the heater (see Figure

10). Only do this with the power disconnected to the

unit!

To rewire the pump circuit, bring in another

120-volt fused supply (L2, N2 & Ground). Connect

incoming power (L2) to the main power switch using

spade (fork) terminal. From the other side of the main

power switch connect to the main terminal block using

a ¼" female insulated quick connect. This will be

the same position where the jumper had terminated (see Figure 10). Connect N2 and Ground to the main

terminal block using ¼" female insulated quick connect

(refer to Figure 10).

5.1.4 All Sizes

Ladder diagrams are shown in Figures 12 and 13. Wiring diagrams are shown in Figures 14 through 16.

Field wiring is shown in Figure 11.

on the Pennant temperature control at the factory.

External Alarm: The eld terminal strip has

terminals for a dry contact that is closed when the

ignition control locks out. These terminals are labeled “ALRM” and “ALRM”.

Additional Call For Heat: Terminals labeled

“COMD” and “HTD” can be used to call the Pennant for heat. These terminals are shipped with a jumper between them. Remove the jumper to use these terminals. The Pennant is controlled by the temperature

sensor, and the temperature must be calling for heat

for the Pennant to re, regardless of any connections between “COMD” and “HTD”, but the Pennant will not re if this connection is broken.

Other Field Interlocks: Other safety switches

that are intended to prevent the Pennant from ring

(such as fan proving switches, powered louver end

switches, etc.) The terminals are marked “OTHER INTS <COM> <NO>”. These terminals are shipped with a jumper between them. Remove jumper to use these terminals. The Pennant will not re if this connection is broken.

Size Circuit Heater Pump

500 20 15 15 750 20 15 15 1000 (TACO) 20 / (B&G) 30 20 15 1250 30 25 15 1500 30 25 15 1750 — 25 20 2000 — 25 20

Table 10. Electrical Data (Amps).

Single Two Circuit

5.2 Field Wiring

Temperature Sensor: The Low Temperature Pennant is controlled by a sensor that requires place-

ment in the system loop or storage tank. A sensor well is shipped with the unit, as well. This sensor placement

allows the Pennant to be called for heat, based on the

system temperature. The sensor is wired to terminals

Figure 10. Removing Jumpers.

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Figure 11. Field Wiring.

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Low Temperature Pennant

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Figure 12. Ladder Diagram, Sizes 500-1000.

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LAARS Heating Systems

Figure 13. Ladder Diagram, Sizes 1250-2000.

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Low Temperature Pennant

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Figure 14. Wiring Diagram, Sizes 500-1000.

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LAARS Heating Systems

Figure 15. Wiring Diagram, Sizes 1250-1500.

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Low Temperature Pennant

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Figure 16. Wiring Diagram, Sizes 1750-2000.

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LAARS Heating Systems

SECTION 6. Operating Instructions

6.1 Filling the Boiler System

1. Ensure the system is fully connected. Close all bleeding devices and open make-up water valve. Allow system to fill slowly.

2. If make-up water pump is employed, adjust

pressure switch on pumping system to provide

a minimum of 12 psi (81.8 kPa) at the highest point in the heating loop.

3. If a water pressure regulator is provided on the

make-up water line, adjust the pressure regulator

to provide at least 12 psi (81.8 kPa) at the highest point in the heating loop.

4. Open bleeding devices on all radiation units

at the high points in the piping throughout the system, unless automatic air bleeders are

provided at such points.

5. Run system circulating pump for a minimum of 30 minutes with the boiler shut off.

6. Open all strainers in the circulating system,

check flow switch operation, and check for

debris. If debris is present, clean out to ensure proper circulation.

7. Recheck all air bleeders as described in Step 4.

8. Check liquid level in expansion tank. With the

system full of water and under normal operating

pressure, the level of water in the expansion tank should not exceed ¼ of the total, with the balance lled with air.

9. Start up boiler according to the procedure in this manual. Operate the entire system, including the pump, boiler, and radiation units for one (1) hour.

10. Recheck the water level in the expansion tank. If the water level exceeds ¼ of the volume of the expansion tank, open the tank drain, and drain to that level.

11. Shut down the entire system and vent all

radiation units and high points in the system

piping, as described in Step 4.

12. Close make-up water valve and check strainer in

pressure reducing valve for sediment or debris

from the make-up water line. Reopen make-up water valve.

13. Check gauge for correct water pressure and also check water level in the system. If the height

indicated above the boiler insures that water is at the highest point in the circulating loop, then the

system is ready for operation.

14. Refer to local codes and the make-up water

valve manufacturer’s instructions as to whether the make-up water valve should be left open or

closed.

15. After placing the unit in operation, the ignition system safety shutoff device must be tested. First,

shut off the manual gas valve, and call the unit

for heat. After the pre-purge and ignitor heat-up

time, the main gas terminals will be energized,

attempting to light, for four (4) seconds, and then will de-energize. The unit will go into lockout mode. Second, turn the power off and then on

again, open the manual gas valve and allow the

unit to light. While the unit is operating, close the

manual gas valve and ensure that power to the

main gas valve has been cut.

16. Within three (3) days of start-up, recheck all air bleeders and the expansion tank as described in Steps 4 and 8 above.

Important: The installer is responsible for identifying to the owner/operator the location of all emergency shutoff devices.

WARNING

Do not use this appliance if any part has been under water. Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control that may have been under water.

AVERTISSEMENT

N’utilisez pas cet appareil si l’une de ses pièces est passée sous l’eau. Appelez tout de suite un technicien en entretien et en réparation pour inspection de l’appareil et remplacement des pièces du système de commande, et des pièces de commande du circuit gaz, qui sont passées sous l’eau.

6.2 Sequence of Operation

The amber “Ready” light on the front panel

indicates that the control system is energized. Upon a

call for heat from the system temperature sensor, the

green “Heat” indicator on the front panel will light. The green “Pump” indicator on the front panel will light.

Once the water ow switch makes, and if all of

the safety interlocks are closed, the ignition module(s) will energize the blower(s) for a 15-second pre-purge, followed by a 20-second period to allow the ignitor(s)

to heat.

Energizing the blower pressurizes the air box

(which supplies air to the burners) and closes the

normally-open contact(s) of the airow pressure switch(es). This allows the ignition module to proceed with the ignition sequence.

The blocked ue pressure switch senses the

pressure difference between the exhaust plenum and the blower inlet plenum. It will interrupt the airow sensing circuit if this pressure exceeds a maximum value. If airow is not proven, the ignition module

will either attempt ignition again (up to three times) or will lockout (if the optional lockout ignition module is

used).

The ignition module checks that the ignitor

current has reached a minimum value and energizes

the gas valves at the end of the ignitor-heating period.

The green indicators on the front panel will

light, indicating that the gas valves are open. After a 4-second trial for ignition, the ignitor switches off, and

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Low Temperature Pennant

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unless the ame sensor detects a ame, the gas valves

will close and the ignition module will either attempt ignition again (up to three times) or will lockout (if the

optional lockout ignition module is used).

Note: At this point, if gas pressure is below the required 5” w.c. minimum, the Pennant may lock out.

If ame is sensed, the burner will continue to re as long as there is a call for heat. If there is a subsequent loss of ame signal, the burner will attempt

re-ignition up to three times (only once if optional

lockout ignition module is used.) Loss of ame signal from the rst ignition module will cause shutdown of the heater.

When the call for heat is satised, the gas

valves close and the blower(s) continues to run for 30

seconds. The pump will continue to run for the length

of time selected at startup by the adjustment of the

pump time delay (Pd).

If a call for heat is prevented from being satised

either by a safety interlock or due to an ignition lock-

out, the red “Service” indicator on the front panel will light. To reset the standard ignition module, toggle the Pennant power switch off, and then on again. (To

reset the optional single try lockout ignition module,

the reset button on the module must be pressed. Inter rupting power to this module will not reset the lockout.)

The Pennant 1250 through 2000 models have two

ignition modules that control different burners.

6.3 Temperature (Operating) Control

The Pennant temperature control operates by

measuring the system temperature. It also controls the Pennant pump operation and the mixing system, which tempers the water entering the heat exchanger to prevent damage from excessive condensation.

6.3.1 Temperature Control Overview

The digital display on the control has the following uses:

• To display the system temperature during

normal operating mode.

• To allow the user to view and adjust the control

settings. There are four buttons on the controller. Top left returns to the beginning. Bottom left is the enter button. Top right is the up arrow. Bottom right is the down arrow.

The temperature control face contains an LCD

screen. The LCD screen will display the system temperature during normal operation. When the control is rst powered up, it displays “ZZZ”. It then ashes the control software number. It then displays the temperature at the system sensor. After

the temperature is displayed, the current settings

(parameters) may be viewed. To scroll through the

parameters, press the down arrow button to advance

to the next parameter. Press the enter button to choose that parameter. Press the up or down arrow to raise, lower or toggle to value of that parameter. Press enter to save a changed value.

By depressing the upper left hand button at

any time during the programming, the menu may be

returned to the beginning.

After about 30 seconds of button inactivity, the

display will revert back to the system temperature.

6.3.2 Programming Parameters - Boilers

When the control is rst turned on, it ashes “ZZZ” and then “022” to indicate that the boiler software is in the control. When the down arrow is pressed, the boiler menu is brought up.

rT – Boiler Return Temperature

This is a display only. This is the temperature at

the boiler’s inlet sensor. This is not system return

temperature, as the water has been mixed with

hot outlet water, for boiler protection.

oAt – Outdoor Air Temperature

This is a display only. This is the outdoor air

temperature, if outdoor reset is used. Must use

optional outdoor reset sensor (p/n 2400-021).

CSP – Calculated Setpoint

This is a display only. When outdoor reset is

used, this is the temperature that is calculated by

the control, based on the settings and conditions,

which becomes the setpoint of the boiler.

bSP – Boiler Setpoint

This is the setpoint for rT (the boiler inlet

temperature sensor). Default is 190°F. Range is

from 140°F to 210°F.

LSP – System Setpoint

This is the setpoint for system, read at the system

sensor that is placed in the system loop. Default

is 180°F. Range is from 60°F to 210°F.

LdF – System Setpoint Differential

This is the differential for LSP. Default is 2.0°F.

Range is 1°F to 30°F.

bdf – Boiler Setpoint Differential

This is the differential for bSP. Default is 10°F.

Range is 1°F to 30°F.

oAr – Outdoor Reset

This enables or disables the outdoor reset

function. Default is “oFF”. Toggle to “on”

if outdoor reset is going to be used. Must use

optional outdoor reset sensor (p/n 2400-021).

oTo - Warm Outdoor Temperature

Upper point of reset curve, where system shutoff

is desired. Default 65°F. Range is 55°F to 70°F.

oAC – Design Temperature

Lower point of reset curve, at which the

maximum water setpoint is needed. Default is

0°F. Range is from –50°F to 60°F.

oAL – Minimum Setpoint

This is the minimum allowable calculated

setpoint, regardless of outdoor temperature.

Default is 160°F. Range is 70°F to 180°F.

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LAARS Heating Systems

oAH – Maximum Setpoint

This is the maximum allowable calculated setpoint, regardless of outdoor temperature. Default is 190°F. Range is 90°F to 210°F.

rc – Reset Ratio

The ratio of air temperature movement to water

temperature movement. Sets the slope of the reset curve. Default is 1.0. Range is from 0.5 to 5.0.

SP – Minimum Mixed Temperature

This setting is fixed at 125°F, and cannot be change by the user.

Pd – Pump Delay

This is the time delay for the boiler’s mounted

pump. The pump will run for this delay time after the call for heat has ended. Default is 2 minutes. Range is from 0.1 minutes to 10 minutes.

Uni - Units

This allows the user to choose between °F (default) and °C.

6.3.3 Programming Parameters – Water Heaters

When the control is rst turned on, it ashes “ZZZ” and then “018” to indicate that the boiler software is in the control. When the down arrow is pressed, the boiler menu is brought up.

rT – Heater Return Temperature

This is a display only. This is the temperature

at the heater’s inlet sensor. This is not system

return temperature, as the water has been mixed

with hot outlet water, for heater protection.

bSP – Heater Setpoint

This is the setpoint for rT (the heater inlet

temperature sensor). Default is 140°F. Range is

from 140°F to 190°F.

LSP – System Setpoint

This is the setpoint for system, read at the system

sensor that is placed in the system loop. Default

is 140°F. Range is from 60°F to 190°F.

LdF – System Setpoint Differential

This is the differential for LSP. Default is 2.0°F.

Range is 1°F to 30°F.

Pd – Pump Delay

This is the time delay for the heater’s mounted

pump. The pump will run for this delay time after

the call for heat has ended. Default is 2 minutes.

Range is from 0.1 minutes to 10 minutes.

SP – Minimum Mixed Temperature

This setting is fixed at 125°F, and cannot be

change by the user.

bdf – Heater Setpoint Differential

This is the differential for bSP. Default is 10°F.

Range is 1°F to 30°F.

Uni - Units

This allows the user to choose between °F

(default) and °C.

CAUTION Should overheating occur or the gas supply fail to shut off, turn off the manual gas control valve to the appliance.

6.4 Limit Controls

Pennant appliances are tted with an automatic

reset high limit and a manual reset high limit, both

sensing the outlet temperature of the Pennant.

Water heater high limits are adjustable up to

200°F (93°C) and boiler high limits are adjustable up to 240°F (116°C).

To set the limit controls, remove the control

panel cover and pull the control panel out to gain

access.

6.5 Operating the Burner and Set Up

6.5.1 Set Up for 0 to 2500 Feet Altitude

The Pennant appliance utilizes a modular design

to achieve its stage-ring. The setup must be checked before the unit is put in operation. Problems such as failure to start, rough ignition, strong exhaust odors, etc. can be due to improper setup. Damage to the

Pennant resulting from improper setup is not covered

by the limited warranty.

1. Using this manual, make sure the installation

is complete and fully in compliance with the

instructions.

2. Determine that the appliance and system are lled with water and all air has been bled from both. Open all valves.

3. Observe all warnings on the Operating

Instructions label and turn on gas and electrical

power to appliance.

4. Switch on the appliance power switch located on the right side of the unit.

5. The Pennant will enter the start sequence, as long as the unit is being called for heat. The blower

and pump come on for pre-purge, then the ignitor warm-up sequence starts and after the ignitor warm-up is complete and all safety devices are

veried, the gas valves open. If ignition doesn’t occur, check that there is proper gas supply. Wait 5 minutes and start the unit again. During

initial start up, air in the gas line may cause the

Pennant to “lock out” during the rst few trials for ignition. Depending on the ignition modules

installed, the manual reset button on the ignition modules may need to be depressed to restart the

Pennant.

6. When the unit is running, the supply gas pressure must be checked. Inlet gas pressure must not exceed 13” W.C. (3.2kPa). The minimum inlet gas pressure is 5” W.C. (1.2kPa).

7. Once the inlet gas pressure is veried, the

outlet gas pressure from each valve (manifold gas pressure) must be checked, and adjusted, if

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Low Temperature Pennant

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necessary. The manifold gas pressure must be

2.5” W.C. (0.62kPa).

8. Complete the setup by checking the CO2 at the outlet of the unit. The CO2 should be 8% for natural gas, or 9.2% for propane.

9. After placing the appliance in operation, the Burner Safety Shutoff Device must be tested.

To test: (a) Close gas shutoff valve with burner

operating.

(b) The ame will go out and blower will

continue to run for the post purge cycle. One additional attempt to light will follow. Ignition will not occur as the gas is off. The

ignition control will lockout, and will have

to be reset before the unit will operate.

appliance. The ignition sequence will start again and the burner will start. The

appliance will return to its previous mode

of operation.

NOTE: Models 1250-2000 have two ignition controls and two ignitors, which work together to ensure all of the burners light properly.

6.5.2 High Altitude Adjustment and Set Up

Pennant appliances may be operated at high

altitude (7700 ft., 2347 m) with a reduction in output of approximately 10%. At altitudes of less than or more than 7700 ft. (2347 m) the appliance will per-

form equally as well, but with differing reductions in

output. At elevations higher than 7700 ft. (2347 m) the reduction in output will exceed 10% and at elevations below 7700 ft. (2347 m) it will be less than 10%. High

altitude adjustment must not be made on appliances

operating at elevations below 2500 ft. (762 m).

No orice changes are required to adjust the

Pennant appliances for high altitude. High altitude

adjustment is accomplished by adjustment of the gas

valve manifold pressure and the air shutter(s). The

required instruments used to assist in these adjustments

are a CO2 or O2 Analyzer and a U-Tube Manometer or other device capable of reading a pressure of 2.5-3.0 inches W.C. (0.62-0.75 kPa).

Start the adjustment process by checking the CO2

in the “as installed” condition. Adjust the air shutter(s) so that the CO2 is about 8% or the O2 is about 6.8% for appliances operating on Natural Gas. For appliances operating on LP Gas adjust the air shutter(s) so that the CO2 is about 9.2% or the O2 is about 6.8%. Appliances

with two blowers should be adjusted so that the air

shutters below each blower are open the same amount.

Once the CO2 or O2 has been set, the manifold

pressure may be adjusted. Remove the 1/8 NPT plug

from the lower side of the gas valve that is to be set

and install a tting, hose and manometer. Start the appliance and observe the manifold pressure. Manifold pressure must be adjusted to 3.0 in. W.C. (0.75 kPa)

(for high altitude only, standard operating pressure is

2.5 in. W.C. (0.62 kPa)). It is adjusted by removing the

slotted cap on the gas valve and turning the adjustment screw (beneath the cap) clockwise to increase pressure and replaced after the adjustments have been

completed and the tting, hose and manometer have been removed and the 1/8” plug has been replaced. Repeat this process until all gas valves have been set. Note: The pressure can be set only when the appliance

is operating and only when the particular gas valve being adjusted is energized by a call for heat from the

staging control.

After all of the gas valve manifold pressures

have been set, the CO2 or O2 must be reset. CO2 or O2

will have changed when the manifold pressure was

adjusted. Open the air shutter(s) to reduce the CO2 or O2 to the values achieved previously.

The procedure is complete when all gas valves

are adjusted to a manifold pressure of 3.0 in. W.C. (0.75 kPa) and the CO2 is adjusted to 8.0% for Natural Gas appliances or 9.2% for LP appliances. When using an O2 analyzer, the correct O2 is 6.8% for both Natural Gas and LP appliances.

CAUTION Should any odor of gas be detected, or if the gas burner does not appear to be functioning in a normal manner, close main shutoff valve, do not shut off switch, and contact your heating contractor, gas company, or factory representative.

6.6 Shutting Down the Pennant

1. Switch off the main electrical disconnect switch.

2. Close all manual gas valves.

3. If freezing is anticipated, drain the Pennant and

be sure to also protect building piping from

freezing.

This step to be performed by a qualied

service person.

6.7 To Restart the Pennant

If drained, follow Section 6.1 in this manual for

proper lling and purging.

1. Switch off the main electrical disconnect switch.

2. Close all manual gas valves.

3. WAIT FIVE (5) MINUTES.

4. Set the aquastat or thermostat to its lowest setting.

5. Open all manual gas valves.

6. Reset all safety switches (pressure switch, manual reset high limit, etc.).

7. Set the temperature controller to the desired

temperature setting and switch on electrical

power.

8. Burner will go through a pre-purge period and ignitor warm-up period, followed by ignition.

Page 32

LAARS Heating Systems

SECTION 7. Maintenance

7.1 System Maintenance

1. Lubricate the system water-circulating pump, if required, per the instructions on the pump.

2. If a strainer is employed in a pressure reducing valve or the piping, clean it every six months.

3. Inspect the venting system for obstruction or leakage at least once a year. Periodically clean

the screens in the vent terminal and combustion

air terminal (when used).

4. Keep the appliance area clear and free from

combustible materials, gasoline, and other

ammable vapors and liquids.

5. If the appliance is not going to be used for extended periods in locations where freezing

normally occurs, it should be isolated from the

system and completely drained of all water. All

systems connected to it should also be drained or

protected from freezing.

6. Low water cutoffs, if installed, should be checked every 6 months. Float type low water cutoff should be ushed periodically.

7. Inspect ue passages, and clean with brushes/ vacuums, if necessary. Sooting in ue passages indicates improper combustion. Determine the cause and correct.

8. Inspect the vent system and air intake system,

and if the vent system is Category III, ensure

that all joints are sealed properly. If joints need

to be resealed, follow venting manufacturer's

instructions to clean and reseal vent system.

proper functioning. It is strongly recommended that a qualied service technician inspect the basic items listed below every year. a. Ignition control g. High limit b. Ignitor h. Pump c. Water temp. control i. Low water cutoff d. Automatic gas valve j. Relays e. Pressure switches k. Flow switch and tubing l. Gas train f. Blower m. Control components

7.2.1 Burners

Close main manual gas valve before proceeding.

Checking the burners for debris - Remove the ignitor

inspection panels(s) and ignitor(s) and inspect the

burners through the ignitor hole(s) using a ashlight to illuminate. If there is any indication of debris on

the burners that are visible, all the burners will need

to be inspected more thoroughly. Remove the screws from around the front of the air box (large panel from

which the ignitor inspection panel(s) were removed),

and remove the large panel. Remove the gas manifold assemblies and the burner panels. Inspect the burners.

Clean burners, if necessary, by blowing compressed air from the outside of the burners into the center

of the burner. A dirty burner may be an indication of improper combustion or dirty combustion air. Determine the cause, and correct. Replace the burners

in the reverse order

7.2 Appliance Maintenance and Component Description

Only genuine Laars replacement parts should be used.

Caution

Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing.

Attention

Lors d’entretien ou de réparation des commandes, étiquetez tous les câbles avant de les déconnecter. Des erreurs de câblage peuvent provoquer des fonctionnements incorrects et dangereux. Après toute intervention d’entretien ou de réparation, vérifier que l’appareil fonctionne correctement.

See Figures 17 and 18 for locations of gas train

and control components.

The gas and electric controls on the appliance

are engineered for long life and dependable operation, but the safety of the equipment depends on their

Figure 17. Gas Train Components.

Page 33

Low Temperature Pennant

Page 33

7.2.2 Filter

The lter used in the Pennant is washable. Since the lter is washable, it will only need replacement occasionally. If lter replacement is needed, it should only be replaced with a factory part. Inspect the air lter monthly, or more often in dirty environments. If there is debris on the air lter, remove it from the lter box, and wash it with mild soap and water. Ensure that the lter is completely dry before reinstalling.

7.2.3 Gas Valves

The gas valves are designed to operate with

supply pressures of 4-13 inches w.c. (1.0 to 3.2 kPa).

To remove a valve, shut off 120-volt power

and the manual gas shutoff valve. Remove the top front panel from the unit. Disconnect the wires to the valve. Disengage the anged tting before and after the valve, and remove the valve. Re-install in reverse order. Ensure o-rings are properly installed for both inlet and outlet. Turn on manual gas shutoff valve and

120 volt power and check appliance operation and

tightness of gas valve connections.

7.2.4 Manual Reset High Limit Control

The high limit switch is manual reset switch with

an adjustable set point, up to 240°F (116°C) on boiler models and 200°F (93°C) on water heater models and boilers ordered with low temperature controls. To

replace the switch, shut off the 120-volt power to the

appliance. Remove the cover from the switch to access

the mounting screws. Remove the screws, and pull the switch off the control panel. Remove the capillary and bulb from the thermal well located in the header. Replace in reverse order.

7.2.5 Automatic Reset High Limit Control

An automatic reset high limit is used in addition

to the manual reset high limit. The high limit switch has an adjustable set point, up to 240°F (116°C) on boiler models and 200°F (93°C) water heater models and boilers ordered with low temperature controls. To

replace the switch, shut off the 120-volt power to the

appliance. Remove the cover from the switch to access the mounting screws. Remove the screws, and pull the switch off the control panel. Remove the capillary and bulb from the thermal well located in the header. Replace in reverse order.

7.2.6 Temperature Control

The temperature control is an on/off control that

also manages the mixing system.

To replace the control, disable the 120v supply

power to the appliance. Unplug all of the electrical connectors, remove the retainer clip and the control. Replace the control in the reverse order.

7.2.7 Ignition Control

The ignition controls ensure the proved interrupt-

ed-type ignition system. They control the hot surface ignitors and prove that the ame signal is appropri-

Figure 18. Typical Control Panel.

Page 34

LAARS Heating Systems

ate for powering the gas valves. It also controls the blower’s pre-purge and post-purge. Pennant models 500 through 1000 have one ignition control. Models 1250 through 2000 have two ignition controls.

To replace a control, shut off the 120-volt power

to the appliance. Remove the cover from the control panel. Remove the electrical connectors from the ignition control. Take out the controller’s mounting screws, and pull the controller out. Replace in reverse order.

7.2.8 Ignitor

The ignitors used are 120v “Hot Surface” type.

They are energized whenever there is a call for heat and switched off when ignition is established and the

ame has been sensed. Pennant models 500 through 1000 have one ignitor. Models 1250 through 2000 have two ignitors. To replace the ignitor, shut off the

120-volt power to the appliance, remove the ignitor

access panel, disconnect the Molex connector, remove the two mounting screws on the ignitor ange, and pull the ignitor out. Install in reverse order, always using a new ignitor gasket with the replacement ignitor.

Caution

Ignitor gets hot. To avoid injury, handle the ignitor with caution.

Attention

Le dispositif d’allumage devient très chaud. Manipulez le dispositif d’allumage avec précaution.

7.2.9 Transformer

The Pennant’s transformer is not capable of

supplying control voltage for external devices such

as zone valves, which must have their own separate

power supply.

Some Pennant units have more than one transformer, and all transformers are not the same size, so ensure that replacement transformers are the

appropriate ones.

Should a transformer need replacing, shut off the

120-volt power. Unplug the transformer wires, remove the mounting screws and remove the transformer. Replace transformer in the reverse order.

7.2.10 Blowers

The combustion air blowers bring the combustion air for the Pennant from the upper chamber to the

lower chamber. Mixing of the gas and air occurs in the burners. Models 500, to 1000 each have one blower, and models 1250 to 2000 each have two blowers.

If a blower change is required, turn off the 120-

volt power and gas supply to the unit. Remove the front panel. Disconnect the blower’s wire harness. Remove the screws at the blower ange, and pull the

blower out. Replace blower in reverse order, ensuring that all joints are made correctly. After replacement,

ensure that the unit operates properly, by following the

set-up procedure in this manual.

7.2.11 Flow Switch

The Pennant uses a paddle-type ow switch to ensure that the unit has water ow before ignition is allowed. To replace the ow switch, turn off the 120volt power to the appliance. Isolate the boiler or water heater from the system by closing the isolation valves.

Caution

Water may be hot enough to scald. Allow water to cool before proceeding.

Attention

L’eau peut être chaude au point de vous brûler. Laissez refroidir l’eau avant d’intervenir.

Release pressure in the system by actuating the pressure relief valves or eld supplied boiler drain valve. Remove cover from the ow switch and disconnect the wires. Unthread the ow switch from piping. Ensure the new ow switch paddles are

trimmed to the same size as the original paddles, and

reinstall in the reverse order. For boiler and other static

pressure systems, restore the system pressure to the

original setting (or 10 psi minimum).

7.2.12 Heat Exchanger Coil

WARNING

Black carbon soot buildup on a dirty heat exchanger can be ignited by a random spark or flame thereby creating a risk of fire or explosion. To prevent this from happening, dampen the soot deposits with a wet brush or fine water spray before servicing the heat exchanger.

AVERTISSEMENT

L’accumulation de suie sur un échangeur thermique sale peut s’enflammer au contact d’une étincelle ou d’une flamme et présenter un risque d’incendie ou d’explosion. Afin d’empêcher que cela se produise, humidifier les dépôts de suie à l’aide d’une brosse mouillée ou par une pulvérisation fine d’eau avant d’effectuer l’entretien de l’échangeur thermique.

The Pennant has a premixed burner system. These systems provide the burners with sufcient air

for complete combustion, and black carbon sooting is

seldom experienced. If sooting is suspected, view ports for inspection of the heat exchanger are provided on the side of the boiler. In the unlikely event that there is

a buildup of black carbon soot or other debris on the

heat exchanger, clean per the following:

Page 35

Low Temperature Pennant

Page 35

1. Disconnect the electrical supply to the unit.

2. Turn off the gas supply by closing the manual gas valve on the heater.

3. Disconnect and remove the wires, conduit and

sensors from all components that are attached to

the inlet/outlet header.

4. Isolate the heat exchanger from the water supply.

5. Disconnect the header anges from the inlet and outlet.

6. Allow the heat exchanger to drain. Remove the

front cover(s) by removing the rubber access

strip(s) and the retaining screws. Remove the

venting and remove the top, by removing the

screws that attach the top to the side panels. Remove the side panels. Remove the front lower panels sealing the combustion area. To remove

the gas train, disconnect the unions located

below the intermediate pan and the eld installed

union located outside the cabinet, and pull up, bringing the union end connectors through the

grommets in the intermediate pan. To remove the

intermediate pan, remove the slide out control

assembly and blower(s) to reveal the screws. Remove the screws holding the intermediate pan, and lift up to remove it. The heat exchanger has

integral metal sections attached, which connect

to the frame of the boiler. Locate and remove

the screws along the front, rear and bottom of the integral metal sections, and remove the heat

exchanger and metal sections by lifting up. On the larger appliances, a center heat exchanger

support must be unbolted before it can be

removed..

7. Remove the heat exchanger from the unit. NOTE: Heat exchangers are heavy and may

require two people to remove to avoid personal

injury.

8. Clean the heat exchanger: A light accumulation

of soot or corrosion on the outside of the heat

exchanger can be easily removed. Use a wire

brush to remove loose soot and scale from the

heat exchanger.

9. NOTE: While the heat exchanger is out of the unit, inspect the rewall refractory insulation. Replace if necessary.

10. Inspect the inside of the copper tubes for scale buildup. Scale can build up on the inner surface of the heat exchanger tubes, which can restrict water ow. If the tubes show signs of scaling, clean the internal surface.

11. Reassemble in the reverse order, and check appliance operation after start-up.

NOTE: The warranty does not cover damage caused by lack of required maintenance, lack of water flow, or improper operating practices.

SECTION 8. Trouble Shooting

8.1 Resolving Lockouts

There are many causes of lockouts. The three

most common causes are: (1) inadequate gas supply,

(2) poor combustion, (3) ignitor failure.

1. Inadequate gas supply: Before proceeding, ensure

that the gas supply has not been shutoff or the LP

tank (LP boilers) is not empty. Then, restart the boiler and observe the operational cycle. After

a 15-second fan pre-purge, the ignitor will heat

up for 40 seconds, and then the unit will light.

If it does not, check the gas supply pressure to the appliance, after resetting the appliance and

attempting another start-up. The gas pressure to the appliance must be above 5 in. w.c. (1.2 kPa) throughout the entire start-up cycle. If it is not,

correct the supply problem (check gas valves or

supply piping). If the supply pressure is adequate, consult the factory for assistance.

2. Poor Combustion: Poor combustion should be suspected if there is a strong ue gas odor. The odor may result from an improper gas/air ratio (high or low O2 or CO2). Pennant appliances operate best with 45% excess air (8% CO2 on natural gas, 9.2% CO2 on LP). Check the CO2 of the appliance and adjust if necessary.

3. Ignitor failure: If the boiler goes through a

normal start cycle but combustion does not

occur, ignitor failure should be suspected. Check

the ignitor by unplugging the ignitor plug and

measuring the ignitor resistance. It should be 50-80 ohms. If the resistance is not 50-80 ohms, replace the ignitor. If the resistance is correct, reset the boiler and check for 120 VAC at the ignitor plug during the start cycle. If there is no

voltage, replace the faulty ignitor wire harness or

the ignition control.

8.2 Delayed Ignition — Possible Causes

A defective burner can cause a delayed ignition.

If the gas supply pressure is proper and the gas valves are functioning properly, then burners should

be inspected. There should be no distortion or

perforations in the burners outside of the active burner

port area. Replace if indicated.

8.3 Short Cycling — Boiler

Boiler short cycling is caused when the

load on the boiler system swings rapidly causing

frequent cycling between call for heat and satised conditions. If short cycling is a problem, it may be

due to an oversized boiler, improper control strategy,

incorrect set points or a load distribution problem.

The boiler controls must be set such that the heating loop temperature setpoint does not interfere with

Page 36

LAARS Heating Systems

the setpoint of the boiler operating control. If the set

points are correct and the system design, controls

scheme, etc. are xed, the temperature differentials may be increased to reduce short cycling. If desired

temperature response is not achievable without short cycling it may be necessary to install a buffer tank

in the system. Contact your Laars representative to discuss possible remedies.

8.4 Short Cycling — Water Heater

Short cycling will generally occur only in combination space heating and water heating applications when the water heater is operating in the

space-heating mode. If the heating load drops below the minimum input of the water heater for an extended

period, the water heater will have a tendency to short

cycle. If short cycling is frequently experienced,

regardless of the control’s attempt to limit it, the

heating load should be redistributed to control it.

If short cycling occurs in a water heater application, it is probably caused by undersized piping between the water heater and the storage tank or by some other factor that restricts proper water

ow through the water heater. The cause should be determined and corrected.

8.5 High Gas Consumption

Appliances operating with an improper air/ fuel ratio are very inefcient and consequently, have very high gas consumption. Because efciency is high when the CO2 is high (or O2 is low), appliances operating with low CO2 or high O2 (especially LP appliances) consume more gas. Adjust the CO2 or O2 for optimum efciency. If no combustion analyzing equipment (CO2 or O2) is available then a proper adjustment of the air/fuel ratio (CO2 or O2) cannot be accomplished. The CO2 should be 8% at high re for natural gas and 9.2% at high re for LP. To check the CO2, rst verify that the supply gas pressure is within 5 to 13 in. w.c. (1.2 to 3.2 kPa). With the Pennant running, set the air box pressure to 1.5 in. w.c. (0.37

kPa) (as a starting point), by adjusting the air shutter(s)

at the intake of the fan(s). Check the CO2, and adjust the air shutters if further adjustment to the CO2 is needed.

directly through the “inducer” terminals F1 and F2 of the (Fenwal) ignition module. The 24V power to the

T’STAT terminal of both ignition modules is routed

through the safety interlocks.

All 24V wiring is routed through the diagnostic

PC board. Wiring harnesses connect between the

diagnostic PC board and the control components,

indicator board, or eld wiring terminal strip. The diagnostic board contains LEDs that indicate open

status of the safety interlocks, and quick-connect terminals that provide tests points for checking

voltage/continuity at various points in the control circuit.

Line-voltage connections are routed via the

line-voltage terminal buss. Certain control elements that may need to be rewired in the eld are connected via the eld wiring terminal strip rather than to the diagnostic PC board. These include the low-water cutoff (LWCO), water ow switch, and inlet/outlet water temperature sensors.

SECTION 9. Replacement Parts

Only genuine Laars replacement parts should be used.

9.1 General Information

To order or purchase parts for the Laars Pennant,

contact your nearest Laars dealer or distributor. If

they cannot supply you with what you need, contact Customer Service (see back cover for address,

telephone and fax numbers).

9.2 Parts List

See next page for the list of available replace-

ment parts. See Figures 19-21 for exploded views

of the boiler's component systems to help identify

replacements parts.

8.6 Troubleshooting Pennant Controls

A diagnostic panel, that includes test points, as well as diagnostic lights, is provided in the control

module. It is located on the right side of the module, behind the display. To access, remove the retaining

screws from the display cover panel and remove

it. Grasp the control module at its base and pull it outward.

Pennant ladder diagrams are shown in Figures

12 and 13. The wiring connection diagrams are shown

in Figures 14 through 16. The blower is energized

Page 37

Low Temperature Pennant

Page 37

Item Description Size Size Size Size Size Size Size

500 750 1000 1250 1500 1750 2000

Sheet Metal Components - SeeFigure19

1 Panel, Jacket, Side Left 5C3420 5C3420 5C3420 5C3420 5C3420 5C3420 5C3420

2 Panel, Jacket, Side Right 5C3521 5C3521 5C3521 5C3521 5C3521 5C3521 5C3521

3 Panel, Jacket, Front 5C3320 7C3320 10C3320 12C3320

3 Panel, Jacket, Front, Left 15C3320 17C3320 20C3320

4 Panel, Jacket, Front, Right 15C3320 17C3320 20C3320

5 Panel, Jacket, Rear 5C3220 7C3220 10C3220 12C3220 15C3220 17C3220 20C3220

5A Panel, Jacket, Rear, Filter Enclosure 15C3026 15C3026 15C3026

6 Panel, Jacket, Top 5C3021 7C3021 10C3021 12C3021

Panel, Jacket, Top, Left 15C3021 17C3021 20C3021

7 Panel, Jacket, Top Right 15C3025 17C3025 20C3025

8 Control Door, Access 5C3011 5C3011 5C3011 5C3011 5C3011 5C3011 5C3011

9 Plate, Gas Pipe Seal 5C3304 5C3304 10C3304 20C3304 20C3304 20C3304 20C3304

(2) (2) (2) (2) (2) (2) (2)

10 Plate, Cover, Wiring 5C3502 5C3502 5C3502 5C3502 5C3502 5C3502 5C3502

11 Plate, Vent 5C3004 5C3004 10C3004 20C3004 20C3004 20C3004 20C3004

12 Cover, Vent Plate 20C3006 20C3006 20C3006 20C3006

13 Plate, Cover, Filter 5C3002 5C3002 5C3002 20C3002 20C3002 20C3002 20C3002

(1) (1) (1) (2) (2) (2) (2)

14 Collar, Vent 5C3106 10C3100 10C3100 15C3100 15C3100 20C3100 20C3100

16 Air Filter R2014700 R2014700 R2014700 R2014700 R2014700 R2014700 R2014700

16A Trim, Jacket, Front 5C3019 7C3019 10C3019 12C3019 15C3019 17C3019 20C3019

16B Housing, Rain Shield, Pump 5C3015 5C3015 5C3015 5C3015 5C3015 5C3015 5C3015

16C Cover, Housing, Pump 5C3016 5C3016 5C3016 5C3016 5C3016 5C3016 5C3016

16D Bracket, Support, Pump Cover 5C3017 5C3017 5C3017 5C3017 5C3017 5C3017 20C3017

Internal Components - SeeFigures20and21

17 Base Assembly 5C1020 7C1020 10C1020 12C1020 15C1020 17C1020 20C1020

18 Chamber, Front 5C2003 7C2003 10C2003 12C2003 15C2003 17C2003 20C2003

18A Chamber, Left Side, Front 5C2015 5C2015 5C2015 5C2015 5C2015 5C2015 5C2015

18B Chamber, Right Side, Front 5C2016 5C2016 5C2016 5C2016 5C2016 5C2016 5C2016

19 Chamber, Rear 5C2006 7C2006 10C2006 12C2006 15C2006 17C2006 20C2006

20 Chamber Assembly, Left, Bottom 5C2602 5C2602 5C2602 5C2602 5C2602 5C2602 5C2602

21 Chamber Assembly, Right, Bottom 5C2200 5C2200 5C2200 5C2200 5C2200 5C2200 5C2200

22 Chamber, Top 5C2001 7C2001 10C2001 12C2001 15C2001 17C2001 20C2001

23 Chamber, Side, Top 5C2002 5C2002 5C2002 5C2002 5C2002 5C2002 5C2002

24 Exhaust Plenum 5C2007 10C2007 10C2007 20C2007 20C2007 20C2007 20C2007

25 Bracket, Chamber, Front 5C2009 7C2009 10C2009

Page 38

LAARS Heating Systems

(1) (1) (1) (2) (2) (2) (2)

(1) (1) (2) (2) (2) (2) (2)

(2) (2) (2) (2) (2) (2) (2)

(1)

(1) (1) (1) (1) (1) (1)

(1) (1) (2) (2)

(1)

(1) (1) (1) (1) (1) (1)

(1) (1) (2) (2)

(1)

(1) (1) (1) (1) (1) (1)

(1) (1) (2) (2)

(1) (1) (1) (1) (1) (1)

Bracket, Chamber, Front Left 12C2011 15C2011 17C2011 20C2011

500 750 1000 1250 1500 1750 2000

26 Bracket, Chamber, Front Right 12C2009 15C2009 17C2009 20C2009

Item Description Size Size Size Size Size Size Size

27 Divider, Chamber, Front 15C2010 20C2002

27A Divider, Upper, Chamber, Front 15C2005 15C2005

27B Divider, Lower, Chamber, Front 15C2002 15C2002

28 Cover, Chamber 5C2004 7C2004

Cover, Chamber, Front Left 10C2004 12C2010 15C2004 17C2010 20C2010

29 Door, Chamber Access 5C2005 5C2005 5C2005 5C2005 5C2005 5C2005 5C2005

30 Cover, Chamber, Front Right 10C2010 12C2008 15C2004 17C2008 20C2008

32 Ignitor, Hot Surface, with Gasket 2400-286 2400-286 2400-286 2400-286 2400-286 2400-286 2400-286

33 Tile, Side (Right and Left) T2015600 T2015600 T2015600 T2015600 T2015600 T2015600 T2015600

34 Tile, Front T2017300

35 Tile, Front, Left Side T2016200 T2016800 T2016800 T2016800 T2016800 T2016800

35A Tile, Front, Right Side T2016300 T2017100 T2017900 T2017100 T2017900 T2017100

35B Tile, Front, Center T2016900 T2016900 T2016900 T2016900

36 Tile, Rear T2015700

37 Tile, Rear, Left Side T2017500 T2016600 T2016600 T2016600 T2016600 T2016600

37A Tile, Rear, Right Side T2016600 T2016600 T2018100 T2016600 T2018100 T2016600

37B Tile, Rear, Center T2017200 T2017200 T2017200 T2017200

38 Tile, Bottom T2015500

39 Tile, Bottom, Left Side T2017400 T2017400 T2017400 T2017400 T2017400 T2017400

39A Tile, Bottom, Right Side T2016500 T2017400 T2018000 T2017400 T2018000 T2017400

39B Tile, Bottom, Center T2015900 T2015900 T2015900 T2015900

Page 39

Low Temperature Pennant

Page 39

(2) (2) (2) (2)

41 Heat Exchanger, Copper R2014901 R2014902 R2014903 R2026701 R2014904 R2026702 R2014905

500 750 1000 1250 1500 1750 2000

Heat Exchanger, Cupro-Nickel R2027801 R2027802 R2027803 R2027804 R2027805 R2027806 R2027807

Item Description Size Size Size Size Size Size Size

42 Water Barrier, Inlet/outlet 20305101 20305101 20305101 20305101 20305101 20305101 20305101

43 Water Barrier, Inlet 10338300 10338300 10338300 10338300 10338300 10338300 10338300

44 Gasket, Header S0095100 S0095100 S0095100 S0095100 S0095100 S0095100 S0095100

(2) (2) (2) (2) (2) (2) (2)

45 Cover, In/Out, Glass-Lined Cast Iron 10364504 10364504 10364504 10364504 10364504 10364504 10364504

Cover, In/Out, Bronze 10364501 10364501 10364501 10364501 10364501 10364501 10364501

46 Well, Temperature Control RE2058300 RE2058300 RE2058300 RE2058300 RE2058300 RE2058300 RE2058300

47 Gasket, Flange S0063700 S0063700 S0063700 S0063700 S0063700 S0063700 S0063700

(2) (2) (2) (2) (2) (2) (2)

48 Flange, Cast Iron 10391302 10391302 10391302 10391302 10391302 10391302 10391302

Flange, Bronze 20255401 20255401 20255401 20255401 20255401 20255401 20255401

49 Relief Valve, PNCH, 75 PSI A0063300 A0063600 A0063600 A0063600 A0063600 A0063600 A0002700

Relief Valve, PNCV, 125 PSI RA0001200 RA0001200 RA0001200 RA0001200 A0064400 A0064400 A0066400

50 Tee, Adapter, Outlet, Cast Iron 20130001 20130001 20130001 20130002 20130002 20130002 20130002

Tee, Adapter, Outlet, Bronze 20150301 20150301 20150301 20150301 20150301 20150301 20150303

51 Flow Switch RE0013000 RE0013000 RE0013000 RE0013000 RE0013000 RE0013000 RE0013000

52 Gauge, Temperature/Pressure RA0079000 RA0079000 RA0079000 RA0079000 RA0079000 RA0079000 RA0079000

54 Low Water Cutoff R0021901 R0021901 R0021901 R0021901 R0021901 R0021901 R0021901

55 Pump Housing, Glass-lined, Cast Iron R20607600 R20607600 R20607600 R20607600 R20607600 R20607600 R20607600

Pump Housing, Bronze 10483300 10483300 10483300 10483300 10483300 10483300 10483300

56 Gasket, Pump Adapter S0024600 S0024600 S0024600 S0024600 S0024600 S0024600 S0024600

57 Pump Adapter, Glass-lined Cast Iron 10364200 10364200 10364200 10364200 10364200 10364200 10364200

Pump Adapter, Bronze 10364201 10364201 10364201 10364201 10364201 10364201 10364201

58 Bafe, Diffuser, Pump Inlet 10338400 10338400 10338400 10338400 10338400 10338400 10338400

59 Pressure Switch RE0240900 RE0240900 RE0240900 RE0240900 RE0240900 RE0240900 RE0240900

(2) (2) (2) (3) (3) (3) (3)

(1) (1) (1) (2) (2) (2) (2)

60 Blower A2111900 A2111900 A2111900 A2111900 A2111900 A2111900 A2111900

61 Weldment, Blower Mount 5C5300 5C5300 5C5300 5C5300 5C5300 5C5300 5C5300

62 Damper, Duct Assembly, Blower 15C5400 15C5400 15C5400 15C5400

Electrical Components - SeeFigure21A

64 Bracket, Control Panel Mounting 5C7103 5C7103 5C7103 5C7103 5C7103 5C7103 5C7103

65 Terminal Board, Field Wiring E2307400 E2307401 E2307402 E2307403 E2307404 E2307405 E2307406

Page 40

LAARS Heating Systems

(1) (1) (2) (2) (2) (2) (2)

(2) (2) (2) (2)

(1) (1) (2) (1) (1)

(1) (2) (3) (1) (2)

(1) (1) (1) (2)

(2) (2) (2) (4)

(1) (1) (2) (1) (1)

(1) (1) (3) (1) (2)

66 Ignition Control, Single Trial E2107300 E2107300 E2107300 E2107300 E2107300 E2107300 E2107300

Item Description Size Size Size Size Size Size Size

500 750 1000 1250 1500 1750 2000

Igniltion Control, Three Trial E2313900 E2313900 E2313900 E2313900 E2313900 E2313900 E2313900

67 Diagnostic Board E2105500 E2105500 E2105500 E2105500 E2105500 E2105500 E2105500

68 Indicator Light Panel Board E2105600 E2105600 E2105600 E2105600 E2105600 E2105600 E2105600

69 Temperature Control E2321700 E2321700 E2321700 E2321700 E2321700 E2321700 E2321700

70 High Limit, Auto Reset, PNCH RE0014400 RE0014400 RE0014400 RE0014400 RE0014400 RE0014400 RE0014400

High Limit, Auto Reset, PNCV, 210F Max. E2217700 E2217700 E2217700 E2217700 E2217700 E2217700 E2217700

71 High Limit, Manual Reset, PNCH RE0015900 RE0015900 RE0015900 RE0015900 RE0015900 RE0015900 RE0015900

High Limit, Manual Reset, PNCV, 210F Max. E2217800 E2217800 E2217800 E2217800 E2217800 E2217800 E2217800

72 Relay, Pump (SPST) E0098300 E0098300 E0098300 E0098300 E0098300 E0098300 E0098300

Relay, Fan (DPDT) E0076600 E0076600 E0076600 E0076600

73 Terminal Bus (12 Position) E2040500 E2040500 E2040500 E2040500 E2040500 E2040500 E2040500

74 Transformer E2310400 E2310400 E2310400 E2312800 E2312800 E2312800 E2312800

75 Circuit Breaker E2318800 E2318800 E2318800 E2318800 E2318800 E2318800 E2318800

Switch, Rocker E2322700 E2322700 E2322700 E2322700 E2322700 E2322700 E2322700

Sensor, Universal (shipped loose) R2014800 R2014800 R2014800 R2014800 R2014800 R2014800 R2014800

Switch, Rocker (main power) not shown E2343300 E2343300 E2343300 E2343300 E2343300 E2343300 E2343300

Gas Train Components - SeeFigure20

76 Manifold, Gas Supply 5C6700 7C6700 10C6700 12C6700 15C6700 17C6700 20C6700

77 Valve, Ball V2003100 V2003100 V2003200 V2003300 V2003300 V2003300 V2003300

Burner Trays - Note: Burner Tray Assemblies contain item numbers 78 through 80.

not Burner Tray Assembly, 3 Burners, Right, Nat 5C6600 5C6600 5C6600 5C6600 5C6600

shown

Burner Tray Assembly, 3 Burners, Left, Nat 5C6500 5C6500 5C6500 5C6500 5C6500

Burner Tray Assembly, 4 Burners, Right, Nat 10C6600 10C6600 10C6600 10C6600

Burner Tray Assembly, 4 Burners, Left, Nat 10C6500 10C6500 10C6500 10C6500

Burner Tray Assembly, 3 Burners, Right, LP 5C6620 5C6620 5C6620 5C6620 5C6600

Burner Tray Assembly, 3 Burners, Left, LP 5C6520 5C6520 5C6520 5C6520 5C6500

Page 41

Low Temperature Pennant

Page 41

(1) (1) (1) (2)

(2) (2) (2) (4)

(2) (3) (3) (5) (5) (6) (6)

(6) (9) (12) (15) (18) (21) (24)

(1) (1) (2) (1) (1)

(1) (1) (3) (1) (2)

(1) (1) (1) (2)

(2) (2) (2) (4)

(2) (3) (5) (2) (3)

(3) (3) (3) (6)

(2) (3) (5) (2) (3)

Burner Tray Assembly, 4 Burners, Right, LP 10C6620 10C6620 10C6620 10C6620

500 750 1000 1250 1500 1750 2000

Item Description Size Size Size Size Size Size Size

Burner Tray Assembly, 4 Burners, Left, LP 10C6520 10C6500 10C6520 10C6520

78 Valve, Gas, Combination V2017600 V2017600 V2017600 V2017600 V2017600 V2017600 V2017600

79 Valve, Manual Shutoff V2000200 V2000200 V2000200 V2000200 V2000200 V2000200 V2000200

Orice, Gas, Natural L2013000 L2013000 L2013000 L2013000 L2013000 L2013000 L2013000

Orice, Gas, Propane L2012400 L2012400 L2012400 L2012400 L2012400 L2012400 L2012400

80 Burner Manifold, 3 Burners, Right L2012900 L2012900 L2012900 L2012900 L2012900

Burner Manifold, 3 Burners, Left L2012800 L2012800 L2012800 L2012800 L2012800

Burner Manifold, 4 Burners, Right L2012700 L2012700 L2012700 L2012700

Burner Manifold, 4 Burners, Left L2012600 L2012600 L2012600 L2012600

81 Burner Tray, 3 Burners L2012200 L2012200 L2012200 L2012200

Burner Tray, 4 Burners L2012500 L2012500 L2012500 L2012500

82 Gasket, Burner Tray, 3 Burner S2012700 S2012700 S2012700 S2012700 S2012700

Gasket, Burner Tray, 4 Burner S2012500 S2012500 S2012500 S2012500

Gasket Tape, Rr, Base (43') R2014500 R2014500 R2014500 R2014500 R2014500 R2014500 R2014500

Gasket Tape, Ft Air Chamber (63') R2014600 R2014600 R2014600 R2014600 R2014600 R2014600 R2014600

Page 42

CONTROLLER COMPONENTS

LAARS Heating Systems

Figure 19. Sheet Metal Components.

DETAIL "A" TYPICAL CONTROLLER

DETAIL “A”

COMPONENTS

TYPICAL

Page 43

Low Temperature Pennant

NOTES: Model 2000 shown for reference.

Page 43

SEE ENLARGEMENT

(DETAIL “A”)

ON PREVIOUS PAGE

ON NEXT PAGE

SEE ENLARGEMENT

(DETAIL “B”)

ON NEXT PAGE

18A

36/37

34/35

38/39

35B

27/A/B

37B

39B

39A

35A

18B

37A

Figure 20. Internal Components.

Page 44

Pennant Hydronic Boiler

SIZE TACO PUMP P/N B&G PUMP P/N

500 A2117201 A2121803 750 A2117201 A2121803 1000 A2117202 A2121802 1250 A2117202 A2121802 1500 A2117203 A2121801 1750 A2117203 A2121801 2000 A2117204 A2121800

LAARS Heating Systems

DETAIL “B” MOUNTED PUMP HEAT EXCHANGER COMPONENTS

Pennant Water Heater with TACO Pump

TACO PUMP P/N SIZE Soft Water Normal Water Hard Water

500 A2117201 A2117201 A2117203 750 A2117201 A2117201 A2117203 1000 A2117201 A2117202 A2117203 1250 A2117201 A2117202 A2117203 1500 A2117201 A2117203 A2117203 1750 A2117203 A2117203 A2117203 2000 A2117204 A2117204 A2117204

Pennant Water Heater with B&G Pump

B&G PUMP P/N SIZE Soft Water Normal Water Hard Water

500 A2121803 A2121803 A2121801 750 A2121803 A2121803 A2121801 1000 A2121803 A2121802 A2121801 1250 A2121803 A2121802 A2121801 1500 A2121803 A2121801 A2121801 1750 A2121801 A2121801 A2121801 2000 A2121800 A2121800 A2121800

Figure 21. Detail of Internal Components.

Laars Heating Systems Company reserves the right to change specifications, components, features, or to discontinue products without notice.

800.900.9276 • Fax 800.559.1583 (CustomerService,ServiceAdvisors&TechnicalSupport)

20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355 (ApplicationsEngineering)

1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130

H2319100D