Laars INDIRECT-FIRED Bedienungsanleitung

238-43480-00E REV 01/08 Doc. 11045

INDIRECT-FIRED

WATER HEATER

A Spanish language version of these instructions is available by contacting

the manufacturer listed on the rating plate.

La version espanola de estas instruccions se puede obtener al escribirle a

la fábrica cuyo nombre aparece in la placa de especificaciones.

INSTALLATION/OPERATING MANUAL

WITH PARTS LISTING AND TROUBLESHOOTING GUIDE

For your family’s comfort, safety, and convenience, we

recommend this water heater be installed and serviced by a

plumbing professional.

WARNING

To avoid damage or injury, there

must be no materials stored

against the indirect water heater

and proper care shall be taken to

avoid unnecessary contact

(especially by children) with the

indirect water heater.

 Do not store or use

gasoline or other

flammable liquids in

the vicinity of this

water heater or any

other appliance.

CONGRATULATIONS!

You have just purchased one of the finest water heaters

on the market today!

This installation, operation, and instruction manual will

explain in detail the installation and maintenance of your

new Indirect water heater. We strongly recommend that

you contact a plumbing professional for the installation of

this water heater.

We require that you carefully read this manual, as well as

the enclosed warranty, and refer to it if questions arise.

If you have any specific questions concerning your

warranty, please consult the plumbing professional from

whom your water heater was purchased. For your

records we recommend that you write the model, serial

number and installation date of your water heater in the

back of this manual.

This manual should be kept with the water heater.

We’re committed to providing you with the finest water

heater made.

CAUTION

The maximum boiler water supply temperature to the indirect heat

exchanger must not exceed 240°F (115°C).

NOTICE

Insulation blankets are not required for this water heater. This

water heater meets or exceeds the ASHRAE/IES 90.1b standards with

respect to insulation and standby loss requirements.

TABLE OF CONTENTS

I- IMPORTANT INFORMATION…………….….. 4

II- SPECIFICATIONS………………………………. 8

III- GENERAL INFORMATION……………………. 12

IV- PRE-INSTALLATION…………………………… 15

V- WATER CONNECTIONS……………………….. 20

VI- ELECTRICAL CONNECTIONS……………….. 25

VII- OPERATING INSTRUCTIONS………………… 26

VIII- MAINTENANCE…………………………………. 29

IX- TROUBLESHOOTING GUIDE………………… 32

X- PARTS LIST………………………………………. 34

XI- NOTES…………………………………………….. 36

SECTION I

IMPORTANT INFORMATION

-READ CAREFULLY-

The equipment must be installed in accordance with those

installation regulations required in the area where the installation

is to be made. These regulations must be carefully followed in

all cases. Authorities having jurisdiction shall be consulted

before installations are made.

All wiring on water heaters installed in the USA must be in

accordance with the National Electrical Code and/or local

regulations; or in Canada, installed in accordance with the

Canadian Electrical Code and/or local regulations.

The following terms are used throughout this manual to bring

attention to the presence of hazards of various risk levels, or to

important information concerning product life.

DANGER

Indicates an imminently

hazardous situation, which,

if not avoided, will result in

death, serious injury, or

substantial property

damage.

WARNING

Indicates a potentially

hazardous situation, which,

if not avoided, could result

in death, serious injury, or

substantial property

damage.

CAUTION

Indicates a potentially

hazardous situation, which,

if not avoided, may result

in moderate, or minor

injury or property damage.

NOTICE

Indicates special

instructions on installation,

operation or maintenance,

which are important but

not related to personal

injury hazards.

Important Information continued-

DANGER

DO NOT store or use gasoline or other flammable, combustible, or

corrosive vapors and/or liquids in the vicinity of this or any other

appliance.

IF YOU SMELL GAS:

 DO NOT try to light any appliance.

 DO NOT touch any electric switch; do not use any

telephone in your building.

 Immediately call your gas supplier from a telephone in another

building. Follow the gas supplier’s instructions.

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

DO NOT OPERATE THE APPLIANCE UNTIL THE LEAKAGE IS

CORRECTED!

Liquefied petroleum gas/propane gas is heavier than air and will

remain at floor level if there is a leak. Basements, crawl spaces,

closets, and areas below ground level will serve as pockets for

accumulation of leaking gas.

This water heater is supplied with an adjustable thermostat to control

water temperature. Hot water temperatures required for automatic

dishwasher and laundry use can cause scald burns resulting in serious

personal injury and/or death. The temperature at which injury

occurs varies with the person’s age and the time of exposure. The

slower response time of disabled persons increases the hazards to

them. NEVER allow small children to use a hot water tap or to draw

their own bath water. NEVER leave a child or disabled person

unattended in a bathtub or shower.

Important Information continued-

WARNING

Installation is not complete unless a pressure and temperature

relief valve is installed into the side of the water heater. See the

Water Connections section of this manual for details.

This water heater contains very hot water under high pressure.

Do not unscrew any pipe fittings or attempt to disconnect any

components of this water heater without positively assuring the

water is cool and has no pressure. Always wear protective

clothing and equipment when installing, starting up, or servicing

this water heater to prevent scald injuries. Do not rely on the

pressure and temperature gauges to determine the temperature

and pressure of the water heater. This water heater contains

components that become very hot. Do not touch any components

unless they are cool.

Improper installation, adjustments, alteration, service or

maintenance can cause property damage, personal injury or loss

of life. Failure to follow all instructions in the proper order can

cause personal injury or death. Read and understand all

instructions, including all those contained in component

manufacturer’s manuals, which are provided with the appliance

before installing, starting-up, operating, maintaining, or

servicing this appliance. Keep this manual and literature in

legible condition and posted near the appliance for reference by

owner and service technician.

This water heater requires regular maintenance and service to

operate safely. Follow the instructions contained in this manual.

Installation, maintenance, and service must be performed only

by an experienced, skilled, and knowledgeable installer or service

agency.

To comply with NSF requirements this water heater is to be:

a) Sealed to the floor with sealant, in a smooth and easily

cleanable way, or

b) Installed with an optional leg kit that includes legs and/or

extensions that provide a minimum clearance of 6”

beneath the water heater.

Important Information continued-

WARNING

It is the responsibility of the installing contractor to see that all

controls are correctly installed and are operating properly when

the installation is complete.

DO NOT operate the water heater with jumpered or absent

controls or safety devices.

DO NOT tamper with or alter the water heater and/or controls.

DO NOT operate the water heater if any external part has been

under water. Immediately call a qualified service technician to

inspect the appliance and to replace any part of the control

system that was under water.

This water heater is suitable for installation on combustible

flooring. DO NOT install this water heater on carpeting.

DO NOT operate this water heater without first being certain it

is filled with water.

Flammable items, pressurized containers, or any other potential

fire hazardous articles must never be placed on or adjacent to the

heater. Containers of flammable gases should not be stored or

used in the same room with this water heater.

Hydrogen gas can be produced in an operating water heater that

has not had water drawn from the tank for a long period of time

(generally two weeks or more). Hydrogen gas is extremely

flammable. To prevent the possibility of injury under these

conditions, we recommend that the water faucet be opened for

several minutes at the kitchen sink before you use any electrical

appliance that is connected to the hot water system. If hydrogen

is present, there will be unusual sounds such as air escaping

through the pipes as hot water begins to flow. Do not smoke or

have open flame near the faucet at the time it is open.

SECTION II

SPECIFICATIONS

Figure 1 – Tank Layout

Table 1: Water Heater Dimension (Inches)

MODEL A B C D E F

30-Gal. / Res. 22 33-5/8 28-1/4 34-3/8 5-3/8 27-1/2

40-Gal. / Res. 24 36 29-3/4 36-3/4 5-3/8 27-1/2

40-Gal. “R” / Res. 22 41-1/8 34-3/8 41-7/8 5-3/8 27-1/2

50-Gal. / Res. 26 36 29-3/4 36-3/4 5-3/8 27-1/2

50-Gal. “R” / Res. 22 46-1/4 40-1/8 47 5-3/8 27-1/2

65-Gal. / Res. 22 59-1/4 53-1/8 60 5-3/8 27-1/2

65-Gal. / Com. 22 59-1/4 53-1/8 60 5-3/8 47-3/4

80-Gal. / Res. 24 59 52-7/8 59-3/4 5-3/8 27-1/2

80-Gal. / Com. 24 59 52-7/8 59-3/4 5-3/8 47-3/4

120-Gal. / Com. 28-1/4 62-1/2 55-3/4 63-1/4 6-3/8 28-1/2

120-Gal. / Com. 28-1/4 62-1/2 55-3/4 63-1/4 6-3/8 48-3/4

Specifications continued-

Table 2: Water Heater Capacities

MODEL

Tank

Capacity

(Gal)

Coil

Volume

(Gal)

Dry Weight

(Lbs) Wet Weight

(Lbs)

30-Gal. / Res. 30 2.7 140 404

40-Gal. / Res. 40 2.7 172 500

40-Gal. “R” / Res. 38 2.7 172 486

50-Gal. / Res. 50 2.7 196 610

50-Gal. “R” / Res. 48 2.7 180 576

65-Gal. / Res. 60 2.7 196 704

65-Gal. / Com. 58 5.0 265 768

80-Gal. / Res. 75 2.7 224 861

80-Gal. / Com. 73 5.0 293 920

120-Gal. / Res. 116 2.7 355 1324

120-Gal. / Com. 114 5.0 415 1370

Table 3: Water Heater Ratings

MODEL

First Hour

Rating

(Gal/Hr)

Continuous

Draw Rating

(Gal/Hr)

Standby

Heat Loss

Rating

(°F/Hr)

Minimum Heat

Output Rate of

the Heat Source

(BTU/Hr)

Minimum

Heat Source

Flow Rate

(Gal/Min)

30-Gal. / Res. 255 235 1.2 157,000 13.7

40-Gal. / Res. 260 235 1.1 157,000 13.7

40-Gal. “R” / Res. 260 235 1.1 157,000 13.7

50-Gal. / Res. 265 235 0.9 157,000 13.7

50-Gal. “R” / Res. 265 235 0.9 157,000 13.7

65-Gal. / Res. 275 235 0.8 157,000 13.7

65-Gal. / Com. 405 370 0.8 245,000 14.0

80-Gal. / Res. 295 235 0.6 157,000 13.7

80-Gal. / Com. 415 370 0.6 245,000 14.0

120-Gal. / Res. 315 235 0.4 157,000 13.7

120-Gal. / Com. 445 370 0.4 245,000 14.0

NOTES: These ratings were obtained with a heat source output rate

and flow rate as specified in Table 3 and a 180°F boiler water supply

temperature. Other results will be obtained under different conditions.

Specifications continued-

Table 4: Water Heater Performance

MODEL

Maximum First

Hour Rating

(Gal/Hr) @

140 °F 115 °F

Continuous

Draw Rating

(Gal/Min) @

140 °F 115 °F

Approximate

Boiler Output

Needed For

Ratings

(BTU/hr)

30-Gal. / Res. 279 429 4.2 6.7 220,000

40-Gal. / Res. 288 438 4.2 6.7 220,000

40-Gal. “R” / Res. 288 438 4.2 6.7 220,000

50-Gal. / Res. 297 447 4.2 6.7 220,000

50-Gal. “R” / Res. 297 447 4.2 6.7 220,000

65-Gal. / Res. 306 456 4.2 6.7 220,000

65-Gal. / Com. 534 820 8.0 12.8 420,000

80-Gal. / Res. 321 470 4.2 6.7 220,000

80-Gal. / Com. 546 834 8.0 12.8 420,000

120-Gal. / Res. 357 507 4.2 6.7 220,000

120-Gal. / Com. 583 871 8.0 12.8 420,000

NOTES: Based on 200 °F boiler water temperature and 50 °F potable

water inlet temperature.

Table 5: Water Heater Performance

MODEL

Hot Water

Availability

(Minutes)

Coil Heat

Transfer Area

(Sq Ft)

Pressure Drop at

Rated Heat Source

Flow Rate

(Feet of Head)

30-Gal. / Res. 5.5 14.2 1.5

40-Gal. / Res. 7.5 14.2 1.5

40-Gal. “R” / Res. 7.5 14.2 1.5

50-Gal. / Res. 9.0 14.2 1.5

50-Gal. “R” / Res. 9.0 14.2 1.5

65-Gal. / Res. 11.0 14.2 1.5

65-Gal. / Com. 10.5 27.2 5.0

80-Gal. / Res. 13.5 14.2 1.5

80-Gal. / Com. 13.2 27.2 5.0

120-Gal. / Res. 20.8 14.2 1.5

120-Gal. / Com. 20.6 27.2 5.0

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