Laars PNCH, PNCV Installation Manual

Installation and Operation Instructions Document 1176K

Installation and Operation Instructions for

™

PENNANT

Hydronic Boiler

Model PNCH

Water Heater

Model PNCV

Sizes 500-2000

U.S. Reg. 2,765,423

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

qualied in hot water boiler installation and maintenance. Improper installation and/or operation could create carbon monoxide gas in ue 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 re or explosion may result causing property damage, personal

injury or loss of life.

Do not store or use gasoline or other

ammable 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 re department.

Installation and service must be performed by a qualied 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 inammables 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 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 qualié ou par le fournisseur de gaz.

AVERTISSEMENT

H2214400K

Page 2

LAARS Heating Systems

TABLE OF CONTENTS

SECTION 1. General Information

1.1 Introduction ...................................................... 4

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

1.3 Warranty .......................................................... 5

1.4 Dimensions ...................................................... 5

1.5 Locating the Appliance..................................... 5

1.6 Locating Pump-Mounted Water Heater

with Respect to Storage Tank(s) ...................... 7

1.7 Locating Pump-Mounted Boiler with

Respect to Return/Supply Header ................... 7

1.8 Locating Appliance for Correct Horizontal Vent/

Ducted Air Distance From Outside Wall .......... 7

SECTION 2.

Venting and Combustion Air

2.1 Combustion Air ................................................ 8

2.1.1 Combustion Air From Room ............................ 8

2.1.2 Intake Combustion Air...................................... 8

2.2 Venting ............................................................. 9

2.2.1 Vent Categories ............................................... 9

2.2.2 Category I Vent ................................................ 9

2.2.3 Common Venting Systems .............................. 9

2.2.4 Category III Vent .............................................. 1

2.3 Locating Vent & Combustion Air Terminals .....11

2.3.1 Side Wall Vent Terminal ..................................11

2.3.2 Side Wall Combustion Air Terminal .................11

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 ................... 12

SECTION 3.

Gas Supply and Piping

3.1 Gas Supply and Piping .................................. 13

SECTION 4A. Water Connections – Boiler

4A.1 Heating System Piping:

Hot Supply Connections – Boiler ................... 14

4A.2 Cold Water Make-Up – Boiler ........................ 14

4A.3 Water Flow Requirements – Boiler ................ 14

4A.4 Freeze Protection – Boiler ............................. 14

SECTION 4B. Water Connections – Water Heater

4B.1 Water System Piping – Water Heater ............ 20

4B.2 Hot Water Supply Piping – Water Heater ...... 20

4B.3 Water Flow Requirements – Water Heater .... 20

4B.4 Combined Water Heating (potable)

and Space Heating – Water Heater ............... 20

4B.5 Freeze Protection – Water Heater ................. 21

SECTION 5. Electrical Connections

5.1 Main Power .................................................... 24

5.1.1 Power Circuits ................................................ 24

5.2 Temperature Control ..................................... 24

5.2.1 Temperature Control Description ................... 24

5.3 External Staging Control Wiring..................... 26

5.4 Low Water Cut-Off ........................................ 26

Pennant

(

500-2000

)

SECTION 6.

Operating Instructions

6.1 Sequence of Operation .................................. 36

6.2 Filling the Boiler System ................................ 36

6.3 Programming the Temperature Control ......... 37

6.3.1 System Piping ................................................ 37

6.3.2 Choosing the Mode........................................ 37

6.3.3 Programming ................................................. 38

6.3.4 Choosing the Mode for your Application ........ 40

6.4 Advanced Topics ............................................ 42

6.4.1 Differential ...................................................... 42

6.4.2 Staging Mode................................................. 42

6.4.3 Boiler Minimum (BOIL MIN) ........................... 43

6.4.4 Boiler Maximum (BOIL MAX) ......................... 43

6.4.5 Boiler Target Temperature ............................. 43

6.4.6 Pump Operation............................................. 43

6.4.7 Setpoint Operation ........................................ 44

6.4.8 Dedicated Domestic Hot Water ..................... 44

6.4.9 Outdoor Reset Operation............................... 44

6.4.10 External Boiler Operation .............................. 46

6.4.11 Limit Controls ................................................. 46

6.4.12 Advanced Programming Mode ...................... 46

6.5 Operating the Burner and Set Up .................. 46

6.5.1 Set Up for 0 to 2500 Feet Altitude.................. 46

6.5.2 High Altitude Adjustment and Set Up ............. 47

6.6 Shutting Down the Pennant ........................... 47

6.5 To Restart the Pennant .................................. 47

Page 3

SECTION 7. Maintenance

7.1 System Maintenance ..................................... 48

7.2 Appliance Maintenance and

Component Description ................................. 48

7.2.1 Burners .......................................................... 48

7.2.2 Filter ............................................................... 48

7.2.3 Gas Valves ..................................................... 48

7.2.4 Manual Reset High Limit Control ................... 48

7.2.5 Automatic Reset High Limit Control ............... 48

7.2.6 Temperature Control ...................................... 49

7.2.7 Ignition Controls ............................................. 49

7.2.8 Ignitors ........................................................... 49

7.2.9 Ignition Sensors ............................................. 49

7.2.10 Transformer ................................................... 49

7.2.11 Blowers .......................................................... 49

7.2.12 Flow Switch ................................................... 49

7.2.13 Heat Exchanger Coil ...................................... 49

SECTION 8.

Trouble Shooting

8.1 Resolving Lockouts........................................ 51

8.2 Delayed Ignition – Possible Causes .............. 51

8.3 Short Cycling – Boiler .................................... 51

8.4 Short Cycling – Water Heater ........................ 51

8.5 High Gas Consumption.................................. 51

8.6 Troubleshooting the Temperature Control ..... 51

8.7 Troubleshooting Pennant Controls ................ 51

SECTION 9.

Replacement Parts

9.1 General Information ....................................... 54

9.2 Parts List ........................................................ 54

Page 4

LAARS Heating Systems

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

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 local codes. Where 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 modications to the boiler, its gas controls, or wiring may void the warranty. If eld conditions require modications, consult the factory representative before initiating such modications.

1.1 Introduction

This manual provides information necessary for

the installation, operation, and maintenance of Laars

Heating Systems Pennant copper tube appliances. Read it carefully before installation.

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

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" w.c. (3.2kPa).

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.

Model Nomenclature

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

P N C A C 2

SERIES

P N C

USAGE

H - HYDRONIC

V - VOLUME WATER

SIZE

MBTU/h

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

ALTITUDE

A - 0'-10,000'

FUEL

N - NATURAL

P - PROPANE

LOCATION

INDOOR & OUTDOOR

FIRING MODE

K - 2-STAGE (500 & 750)

N - 3-STAGE (1000)

L - 4-STAGE (1250,1500,

1750 & 2000)

HLW STAMP (PNCV only)

2 - GLASS-LINED CAST

IRON / COPPER / BRZ

TRIM

5 - GLASS-LINED CAST

IRON / CU-NICKEL,

BRZ TRIM

REVISION

SECOND

REV

HEAT EXCHANGER

B - GLASS-LINED CAST

IRON/COPPER/BRZ TRIM (std. on PNCV)

C - GLASS-LINED CAST

IRON/COPPER (std. on PNCH, not avail. on PNCV)

N - GLASS-LINED CAST

IRON/CU-NICKEL (not avail. on PNCV)

P - GLASS-LINED CAST

IRON / CU-NICKEL BRZ TRIM

OPTIONS CODE

X - STANDARD J - CSD-1, FM,

GAP, IL

X - NO PUMP

H - PUMP-MTD, TACO

HARD WATER

PUMP (PNCV)

N - PUMP-MTD, TACO NORM WATER

PUMP (PNCV, PNCH)

S - PUMP-MTD, TACO

SOFT WATER PUMP (PNCV)

C - PUMP-MTD, B&G HARD WATER

PUMP (PNCV)

B - PUMP-MTD, B&G NORM WATER

PUMP (PNCV, PNCH)

D - PUMP-MTD, B&G

SOFT WATER PUMP (PNCV)

PUMP OPTIONS

Pennant

(

500-2000

)

Page 5

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

K = Two-stage (models 500 & 750) N = Three-stage (model 1000) L = Four-stage (models 1250 - 2000)

13 Revision

2 = Second version

14 Heat Exchanger

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

15 Option Code

X = Standard unit J = CSD-1, FM, IRI, IL

16 Pump Options

X = No Pump H = Pump mounted, TACO, hard water pump

N = Pump mounted, TACO, normal pump

S = Pump mounted, TACO, soft water pump C = Pump mounted, B&G, hard water pump

B = Pump mounted, B&G, normal pump

D = Pump mounted, B&G, soft water pump

Claims must include the serial number and model

number (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

above grade.

The dimensions and requirements that are shown in Table 1 should be met when choosing the locations

for the appliance.

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.

Page 6

LAARS Heating Systems

ØØ

SHIPPING WEIGHT

SIZE lbs. kg

500 425 193 750 505 229 1000 615 279 1250 675 306 1500 760 345 1750 825 375 2000 955 434

*Add 55 lbs. (25kg) for

pump-mounted units.

Air

Size A B C D E F G H

Conn.

500 33½ 85 15¾ 40 5¾ 15 29¾ 76 33¾ 86 7¾ 20 8¾ 22 46 117 6 15 8 20 6 15

750 45½ 11 6 21¾ 55 5¾ 15 29¾ 76 33¾ 86 7¾ 20 8¾ 22 58 147 8 20 10 25 8 20

1000 57½ 146 28¾ 73 5¾ 15 29¾ 76 33¾ 86 7¾ 20 7 18 70 178 8 20 10 25 8 20

1250 68 172 34 86 101∕826 30¾ 78 311∕879 8¾ 22 8¾ 22 80 203 12 30 12 30 10 25

1500 78½ 199 39¾ 101 101∕826 30¾ 78 311∕879 8¾ 22 8¾ 22 91 231 12 30 12 30 10 25

1750 89 226 44½ 113 101∕826 30¾ 78 311∕879 8¾ 22 8¾ 22 101 256 12 30 14 36 12 30

2000 99½ 253 49¾ 126 101∕826 30¾ 78 311∕879 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

Vent

Conn.

Horiz.

Vent

Pipe

Figure 1. Dimensional Data.

Pennant

(

500-2000

)

Page 7

1.6 Locating Pump-Mounted Water Heater

with Respect to Storage Tank(s)

For best results, a pump-mounted 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 shall

be used. Consult the factory for assistance.

1.7 Locating Pump-Mounted Boiler with

Respect to Return/Supply Header

For the best results, a pump-mounted Pennant Boiler 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 shall be used. Consult the factory for assistance.

REQUIRED RECOMMENDED

APPLIANCE CLEARANCE FROM SERVICE ACCESS

SURFACE

inches cm inches cm 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) 6* 15.2* Vent Horizontal per UL1738 venting

(Category 3) system supplier’s

Vent instructions

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

COMBUSTIBLE MATERIAL CLEARANCE

1.8 Locating Appliance for Correct Horizontal Vent/Ducted Air Distance

From Outside Wall

The forced draft combustion air blower/blowers

in the appliance has/have sufcient power to pull air

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

NOTE: On all model sizes, 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 2. 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.

Table 1. Clearances.

HORIZONTAL INTAKE AIR

VENT COLLAR VENT PIPE PIPE MAX. PIPE MAX. NO. SIDE WALL SIDE WALL SIZE SIZE DIAMETER DIAMETER LENGTH OF ELBOWS VENT COMBUSTION

TERMINAL AIR TERMINAL

in. cm in. cm in. cm ft. m PART NUMBER PART NUMBER 500 8 20 6 15 6 15 50 15 3 CA001401 CA20260701

750 10 25 8 20 8 20 50 15 3 CA001402 CA20260703 1000 10 25 8 20 8 20 50 15 3 CA001402 CA20260703 1250 12 30 10 25 10 25 50 15 3 CA001405 CA20260705 1500 12 30 10 25 10 25 50 15 3 CA001405 CA20260705 1750 14 36 12 30 12 30 50 15 3 CA001404 CA20260706 2000 14 36 12 30 12 30 50 15 3 CA001404 CA20260706

Table 2. Horizontal Vent / Combustion Air Parameters.

Page 8

LAARS Heating Systems

SECTION 2.

Venting and Combustion Air

2.1 Combustion Air

Pennant boilers and water heaters must have

provisions for combustion and ventilation air in

accordance with Section 5.3, Air for Combustion and Ventilation, of the National Fuel Gas Code, ANSI Z223.1, or Sections 7.2, 7.3 or 7.4 of CSA B149.1,

Installation Codes, or applicable provisions of the local

building codes.

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. 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.

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

EACH OPENING* SIZE SQUARE INCHES SQUARE CM

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.

Figure 2. Combustion Air and Vent Through Roof.

Pennant

(

500-2000

)

Page 9

length allowed is 50 feet (15.2m). Three elbows have been calculated into the 50-foot (15.2m) 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. The 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-Latest Edition), or in Canada the CSA B149.1 (latest edition), 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.

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 CSA B149.1 (latest edition). The vent

system must be sized and installed for a Category I

Fan-Assisted Appliance.

If chimney height is greater than 25 feet, or

TERM DESCRIPTION

Pipe Single-wall galvanized steel pipe, 24 gauge minimum (either insulated or non-insulated)

Joint Permanent duct tape or aluminum tape Sealing

Table 4. Required Combustion Air Piping Material.

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 (negative) 0.1" w.c.

If using a power venter for any type of Category

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

0.01 and 0.10" 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 Cat III vent system

(horizontal discharge or other conguration for Cat

III), 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 ue

gasses into living spaces, common venting should not be applied, and appliances should each be vented separately.

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 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 backpressure 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

Page 10

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

C = Clearance to permanently closed window See note 4 See note 5

D = Vertical clearance to ventilated soft 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 soft 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 3 feet (91 cm) within a height 15 feet above

extended above meter/regulator assembly See note 4 the meter/regulator assembly

I = Clearance to service regulator vent outlet See note 4 3 feet (91 cm)

J = Clearance to nonmechanical air supply inlet to building or the combustion air inlet to 4 feet (1.2 m) below or to side of opening; 36 inches (91 cm) any other appliance 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

Vent termination not allowed in this location Vent termination not allowed in this location for category IV appliances. A vent shall not L = Clearance above paved sidewalk or paved for category IV appliances. For Category III terminate directly above a sidewalk or paved

driveway located on public property appliances, vent must terminate at least 7 driveway that is located between two single feet (2.13m) above the sidewalk or driveway. family dwellings and serves both dwellings. For Category III appliances that do not violate

the previous condition, vent must terminate

at least 7 feet (2.13m) above the sidewalk or driveway.

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 Installation Codes.

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

4. For clearances not specied 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 specied in CSA-B149.1, clearance is in accordance with local installation codes and the requirements of the gas supplier.

LAARS Heating Systems

Figure 3. Combustion Air and Vent Through Side Wall.

Pennant

(

500-2000

)

Page 11

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 listed on 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 gasses 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. 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.

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 or .2 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. Vent terminals for condensing appliances or

appliances with condensing vents are not permitted to terminate above a public walkway, or over an area where condensate or vapor could

create a nuisance or hazard.

3. Locate the vent terminal so that vent gases cannot be drawn into air conditioning system inlets.

4. 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.

5. 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.

6. 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.

7. 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

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.

2.3 Locating Vent & Combustion Air

Terminals

2.3.1 Side Wall Vent Terminal

The appropriate Laars side wall vent hood must

be used, and is listed in the installation and operation

TERM DESCRIPTION

Pipe Must comply with UL Standard 1738 such as Type 29-4C Stainless Steel

(either insulated or non-insulated). Joint Follow vent manufacturer’s instructions

Sealing

Table 5. Required Horizontal Venting Material.

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).

Page 12

LAARS Heating Systems

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 no 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

conforms to the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CSA B149.1, 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 Part

II of the National Fuel Gas Code, ANSI Z223.1/ NFPA 54 and/or CSA B149.1, Installation Codes.

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' of appropriately sized galvanized single wall

or B-Vent and a rain cap for exhaust vent termination in the default conguration (venting out of the top). An appropriately sized galvanized 90° ell, 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 in Table 6 may be used.

Part numbers for the low prole terminals to

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

OUTDOOR OUTDOOR SIZE VENT COMBUSTION

TERMINAL AIR TERMINAL

500 20254703 D2007900 750 20254705 D2008000 1000 20254705 D2008000 1250 D2007700 D2008200 1500 D2007700 D2008200 1750 D2007800 D2008200 2000 D2007800 D2008200

Table 6. Vent Terminals for Outdoor Units.

Pennant

(

500-2000

)

Page 13

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" w.c. (1.2kPa).

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 1/2 PSIG (3.45kpa).

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 1/2 PSIG (3.45kpa).

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 ame to check for leaks. An open ame could lead to explosion, which could result in property damage, serious injury or death.

NOTE: The Pennant appliance and all other gas

appliances sharing the gas supply line must be ring

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

SIZE AND GAS TYPE 0-100' 0-31m 100-200' 31-61m 200-300' 61-91m

500 natural 1-1/2" 3.8cm 2" 5.1cm 2" 5.1cm 500 propane 1" 2.5cm 1-1/2" 3.8cm 1-1/2" 3.8cm

750 natural 2" 5.1cm 2" 5.1cm 2-1/2" 6.4cm 750 propane 1-1/2" 3.8cm 1-1/2" 3.8cm 2" 5.1cm

1000 natural 2" 5.1cm 2-1/2" 6.4cm 3" 7.6cm 1000 propane 1-1/2" 3.8cm 2" 5.1cm 2-1/2" 6.4cm

1250 natural 2-1/2" 6.4cm 2-1/2" 6.4cm 3" 7.6cm 1250 propane 2" 5.1cm 2" 5.1cm 2-1/2" 6.4cm

1500 natural 2-1/2" 6.4cm 3" 7.6cm 3" 7.6cm 1500 propane 2" 5.1cm 2-1/2" 6.4cm 2-1/2" 6.4cm

1750 natural 2-1/2" 6.4cm 3" 7.6cm 3" 7.6cm 1750 propane 2" 5.1cm 2-1/2" 6.4cm 2-1/2" 6.4cm

2000 natural 3" 7.6cm 3" 7.6cm 3-1/2" 8.9cm 2000 propane 2-1/2" 6.4cm 2-1/2" 6.4cm 3" 7.6cm

Notes:

1. These gures are based on 1/2" (0.12kPa) 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.

OR LAST STAGE REGULATOR

Table 7. Gas Piping Size.

Page 14

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 psi (82.7kPa)

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 12psig (82.7kPa). Install shutoff valves where required by code.

Suggested piping diagrams are shown in Figures

4 through 8. These diagrams are meant only as a guide.

20°F 25°F 30°F 35°F SIZE ow H/L ow H/L ow H/L ow H/L

500 43 1.7 34 1.1 28 0.9 24 0.7 750 64 3.3 51 2.3 43 1.7 36 1.2 1000 85 5.0 68 3.6 57 3.1 49 2.2 1250 106 8.1 85 6.1 71 4.7 61 3.4 1500 128 10.0 102 7.2 85 5.5 73 4.2 1750 N/R N/R 119 10.5 99 8.4 85 5.8 2000 N/R N/R 136 12.5 113 10.4 97 8.3

Metric Equivalent

11°C 14°C 17°C 19°C SIZE ow H/L ow H/L ow H/L ow H/L

500 161 0.5 129 0.3 107 0.3 92 0.2 750 241 1.0 193 0.7 161 0.5 138 0.4 1000 321 1.5 257 1.1 214 0.9 184 0.7 1250 401 2.5 322 1.9 269 1.4 231 1.0 1500 483 3.0 386 2.2 322 1.7 276 1.3

 1750 N/R N/R 451 3.2 375 2.6 322 1.8

2000 N/R N/R 515 3.8 429 3.2 368 2.5

Notes: gpm = gallons per minute, lpm = liters per minute,

H/L = headloss, ft = headloss in feet, m = headloss in meters. Maximum temperature rise is 35°F (19°C), as shown. Headloss is for boiler’s heat exchanger only. N/R = not recommended.

gpm feet gpm feet gpm feet gpm feet

lpm m lpm m lpm m lpm m

Components 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

A hydronic heating (closed loop) application

re-circulates the same uid in the piping system. As a result, no new minerals or oxygen is introduced into the system. To ensure a proper operating temperature leading to long boiler life, a ow rate has been established based on the uid temperature rise for this specic size boiler.

Pump-mounted boilers can be ordered for use in

primary secondary piping systems. The pumps used are sized for the headloss through the heater, plus 30 feet (9.1m) of full-sized piping (same size as boiler outlet) and a normal number of ttings.

Table 8 species water ow rates for boilers,

which will enable the user to size a pump. The

headloss shown is for the heater only, and the user will need to add the headloss of the system piping to

properly size the pump.

The minimum inlet water temperature for the

Pennant is 120°F (49°C) to avoid condensing on the copper coils.

Table 8. Water Flow Requirements - PNCH.

Pennant

PRIMARY/SECONDARY MANDITORY FOR ALL VARIABLE FLOW SYSTEMS

INSTALLAIR VENTS AT HIGH POINTS IN SYSTEM PIPING&SIZING OF EXPANSION TANK

PER TANK MANUFACTURER'S INSTRUCTIONS DIMENSION "C" (COMMON PIPING) TO BE FOUR

PIPE DIAMETERS, MAX. (NO ELBOWS OR VALVES) BOILER CIRCUIT PIPING MUST BE EQUAL

TO BOILER WATER CONNECTION SIZE BOILER CIRC. PUMP SIZED FOR FLOW THROUGH BOILER

DOTTED DEVICES INDICATE ALTERNATE LOCATIONS PUT BOILER CONTROL SENSOR IN THE SYSTEM

PUMP LOCATION FOR PUMP-MOUNTED UNITS

SYSTEM PUMP

MAKE-UP

COLD WATER

SUPPLY

SYSTEM

PUMP LOCATION FOR NON-PUMP-MOUNTED UNITS

RETURN

SYSTEM

SUPPLY WHEN USING THIS PIPING STYLE. MINIMUM BOILER INLET WATER TEMPERATURE

MUST BE AT LEAST 120°F.

LEGEND

CHECK VALV E

THERMOMETER

TEMPERATURE SENSOR

GLOBE VALV E

EXPANSION TANK WITH AIR SCOOP AND AUTO AIR VENT

3-WAY VALV E

VALV E

CAUTION: THIS DRAWING SHOWS SUGGESTED PIPING CONFIGURATION AND VA LVING, CHECK WITH LOCAL CODES AND ORDINANCES FOR ADDITIONAL REQUIREMENTS.

PRESSURE REDUCING VA LVE W/ FAST FILL BYPASS

PURGE

VALV E

PUMP

(

500-2000

)

Page 15

Figure 4. Hydronic Piping — Multiple Boilers, Primary Secondary System.

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. When a 50/50 mixture is used, increase the water ow requirements by 15%, and increase the headloss requirements by 20%.

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 specications, or the glycol manufacturer, for information about specic products, maintenance

of solutions, and set up according to your particular conditions.

Page 16

PRIMARY/SECONDARY MANDITORY FOR ALL VARIABLE FLOW SYSTEMS INSTALLAIR VENTS AT HIGH POINTS IN SYSTEM

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

DIMENSION "C" (COMMON PIPING) TO BE FOUR PIPE DIAMETERS, MAX. (NO ELBOWS OR VALVES)

BOILER CIRCUIT PIPING MUST BE EQUAL TO BOILER WATER CONNECTION SIZE

BOILER CIRC. PUMP SIZED FOR FLOW THROUGH BOILER

DOTTED DEVICES INDICATE ALTERNATE LOCATIONS

PUT BOILER CONTROL SENSOR IN THE SYSTEM

PUMP LOCATION FOR PUMP-MOUNTED UNITS

SYSTEM PUMP

MAKE-UP

COLD WATER

SUPPLY

SYSTEM

PUMP LOCATION FOR NON-PUMP-MOUNTED UNITS

RETURN

SYSTEM

SUPPLY WHEN USING THIS PIPING STYLE.

MINIMUM BOILER INLET WATER TEMPERATURE MUST BE AT LEAST 120°F.

ADJUSTMENT PROCEDURE TO MAINTAIN 120°F INLET TEMP:

1. Turn on boiler and open valves A&B.

2. After steady-state operation, if T1 is less than slowly close valveBuntil T1 climbs to

120°F.

3. If T1 is greater than 120°F, slowly close

until T1 dropsto 120°F.

4. Check after system operating temperature

has stabilized. Make final adjustments.

120°F,

valve A

LEGEND

CHECK VALV E

THERMOMETER

TEMPERATURE SENSOR

GLOBE VALV E

EXPANSION TANK WITH AIR SCOOP AND AUTO AIR VENT

3-WAY VALV E

VALV E

CAUTION: THIS DRAWING SHOWS SUGGESTED PIPING CONFIGURATION AND VA LVING, CHECK WITH LOCAL CODES AND ORDINANCES FOR ADDITIONAL REQUIREMENTS.

PRESSURE REDUCING VA LVE W/ FAST FILL BYPASS

PURGE

VALV E

PUMP

LAARS Heating Systems

Figure 5. Hydronic Piping — Multiple Boilers, Low Temperature System.

Pennant

PRIMARY/SECONDARY MANDITORY FOR ALL VARIABLE FLOW SYSTEMS

INSTALLAIR VENTS AT HIGH POINTS IN SYSTEM

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

DIMENSION "C" (COMMON PIPING) TO BE FOUR PIPE DIAMETERS, MAX. (NO ELBOWS OR VALVES)

BOILER CIRCUIT PIPING MUST BE EQUAL TO BOILER WATER CONNECTION SIZE

BOILER CIRC. PUMP SIZED FOR FLOW THROUGH BOILER

DOTTED DEVICES INDICATE ALTERNATE LOCATIONS

PUT BOILER CONTROL SENSOR IN THE SYSTEM

PUMP LOCATION FOR PUMP-MOUNTED UNITS

SYSTEM PUMP

MAKE-UP

COLD WATER

PUMP LOCATION FOR NON-PUMP-MOUNTED UNITS

SUPPLY WHEN USING THIS PIPING STYLE.

MINIMUM BOILER INLET WATER TEMPERATURE MUST BE AT LEAST 120°F.

180°F

150°F

130°F

NOTES:

1. BOILER LOOP IN EXAMPLE IS MAINTAINED AT 180°F.

2. ZONE THERMOSTATS CAN BE INTERLOCKED WITH BOILER, SO THAT BOILER FIRES UPON CALL FOR HEAT FROM ANY ZONE.

3. ZONE PIPING AND INTERLOCK WIRING TO BE DESIGNED BY SYSTEM ENGINEER.

LEGEND

CHECK VALV E

THERMOMETER

TEMPERATURE SENSOR

GLOBE VALV E

EXPANSION TANK WITH AIR SCOOP AND AUTO AIR VENT

3-WAY VALV E

VALV E

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

PRESSURE REDUCING VALV E W/ FAST FILL BYPASS

PURGE

VALV E

PUMP

(

500-2000

)

Page 17

Figure 6. Hydronic Piping — One Boiler, Multi-Temperature System.

Page 18

LEGEND

CHECK VALV E

THERMOMETER

TEMPERATURE SENSOR

GLOBE VALV E

EXPANSION TANK WITH AIR SCOOP AND AUTO AIR VENT

3-WAY VALV E

VALV E

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

PRESSURE REDUCING VALV E W/ FAST FILL BYPASS

PURGE

VALV E

PUMP

PRIMARY/SECONDARY MANDITORY FOR ALL VARIABLE FLOW SYSTEMS

INSTALLAIR VENTS AT HIGH POINTS IN SYSTEM

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

DIMENSION "C" (COMMON PIPING) TO BE FOUR PIPE DIAMETERS, MAX. (NO ELBOWS OR VA LVES)

BOILER CIRCUIT PIPING MUST BE EQUAL TO BOILER WATER CONNECTION SIZE

BOILER CIRC. PUMP SIZED FOR FLOW THROUGH BOILER

DOTTED DEVICES INDICATE ALTERNATE LOCATIONS

PUT BOILER CONTROL SENSOR IN THE SYSTEM

PUMP LOCATION FOR PUMP-MOUNTED UNITS

SYSTEM PUMP

MAKE-UP

COLD WATER

SUPPLY

SYSTEM

PUMP LOCATION FOR NON-PUMP-MOUNTED UNITS

RETURN

SYSTEM

SUPPLY WHEN USING THIS PIPING STYLE.

MINIMUM BOILER INLET WATER TEMPERATURE MUST BE AT LEAST 120°F.

LAARS Heating Systems

Figure 7. Hydronic Piping - Primary-Secondary, Reverse-Return.

Pennant

LEGEND

CHECK VALV E

THERMOMETER

TEMPERATURE SENSOR

GLOBE VALV E

EXPANSION TANK WITH AIR SCOOP AND AUTO AIR VENT

3-WAY VALV E

VALV E

PRESSURE REDUCING VALV E W/ FAST FILL BYPASS

PURGE

VALV E

PUMP

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

PRIMARY/SECONDARY MANDITORY FOR ALL VARIABLE FLOW SYSTEMS

INSTALLAIR VENTS AT HIGH POINTS IN SYSTEM

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

DIMENSION "C" (COMMON PIPING) TO BE FOUR PIPE DIAMETERS, MAX. (NO ELBOWS OR VA LVES)

BOILER CIRCUIT PIPING MUST BE EQUAL TO BOILER WATER CONNECTION SIZE

BOILER CIRC. PUMP SIZED FOR FLOW THROUGH BOILER

DOTTED DEVICES INDICATE ALTERNATE LOCATIONS

PUT BOILER CONTROL SENSOR IN THE SYSTEM

PUMP LOCATION FOR PUMP-MOUNTED UNITS

SUPPLY WHEN USING THIS PIPING STYLE.

MINIMUM BOILER INLET WATER TEMPERATURE MUST BE AT LEAST 120°F.

SYSTEM PUMP

MAKE-UP

COLD WATER

SUPPLY

SYSTEM

PUMP LOCATION FOR NON-PUMP-MOUNTED UNITS

RETURN

SYSTEM

T1 T1

ADJUSTMENT PROCEDURE TO MAINTAIN 120°F INLET TEMP:

1. Turn on boiler and open valves A&B.

2. After steady-state operation, if T1 is less than 120°F, slowly close valveBuntil T1 climbs to 120°F.

3. If T1 is greater than 120°F, slowly close valve

A until T1 dropsto 120°F.

4. Check after system operating temperature has

stabilized. Make final adjustments.

(

500-2000

)

Page 19

Figure 8. Hydronic Piping - Primary-Secondary, Reverse-Return, Low Temperature.

Page 20

LAARS Heating Systems

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. A pump draws

water from the storage tank and pumps the water

through the heater and back into the tank. Pump-

mounted units have a circulating pump built into

the water heater. The pumps used are sized for the headloss through the heater, plus 30 feet (9.1m) of full-

sized piping (same size as boiler outlet) and a normal

number of ttings. Pumps used on pump-mounted unit are sized for soft/normal or hard water, so make sure

a pump-mounted 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

9 through 12. 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 for

more full-featured domestic water heating control. To

get these features, you must provide a location for the

additional sensor. It can be strapped to a pipe from 1" to 4" diameter, or inserted into a tank immersion well.

The minimum inlet water temperature for the

Pennant is 120°F (49°C) to avoid condensing on the copper coils.

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.

Pump-mounted water heaters can be ordered

with standard pumps for soft or normal water or with

pumps for hard water. The pumps used are sized for the headloss 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 size a pump.

The headloss shown is for the heater only, and the user will need to add the headloss of the piping system to

properly size the pump.

4B.4 Combined Water Heating (potable)

and Space Heating — Water Heater

NOTE: These systems are not allowed in the Commonwealth of Massachusetts.

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.

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Laars PNCH, PNCV Installation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual