Laarsen Associates IW, PW, VW User Manual

Installation and Operation Instructions Document 2040D

Installation and Operation Instructions for

Mighty Therm

Volume Water Heaters Models VW, PW and IW

Sizes 500-1825

These instructions are to be stored in the pocket provided on the boiler.

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

qualified in hot water heater 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.

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.

H0105000D

Page 2

LAARS HEATING SYSTEMS

TABLE OF CONTENTS

SECTION 1. General Information

1A. Introduction................................................... 3

1B. Heater Identification .....................................3

1C. Flow Requirements ...................................... 4

1D. Water Chemistry...........................................4

SECTION 2. Installation

2A. Heater Placement......................................... 4

2B. Installation of Indoor Heaters .......................4

2B-1. Combustion Air Supply................................. 6

2B-2. Venting .........................................................6

2C. Installation of Outdoor Heaters.....................7

2D. Gas Supply and Piping................................. 7

2E. Electrical Wiring............................................ 8

2F. Water Piping of System ................................ 8

2G. Water Expansion .......................................... 9

2H. Pump Performance and Installation ...........10

2I. Water Pressure .......................................... 16

2J. Tank Installation .........................................16

2K. Two-Temperature System .......................... 16

SECTION 3. Operation

3A. Controls - General ......................................16

3B. Initial Start-Up............................................. 17

3C . To Start Up System .................................... 18

3D. To Turn Off Heater ....................................... 19

3E. To Shut Down System ................................ 19

SECTION 4. Maintenance

...................................................................19

SECTION 5. Troubleshooting and Analysis of Service Problems

...................................................................20

SECTION 6. Parts Descriptions and Order Numbers

...................................................................22

SECTION 7. Outdoor Parts Descriptions and Order Numbers

...................................................................30

SECTION 8. Optional Parts Descriptions and Order Numbers

...................................................................32

Mighty Therm Volume Water Heater

Page 3

SECTION 1. General Information

1A. Introduction

This manual provides information for the installation and operation of Laars volume water heaters. It is strongly recommended that all application and installation procedures be reviewed completely before proceeding with the installation. Consult the Laars factory, or local factory representative, with any problems or questions regarding this equipment. Experience has shown that most problems are caused by improper installation.

Some accessory items are shipped in separate packages. Verify receipt of all packages listed on the package slip. Inspect everything for possible damage upon delivery, and inform the carrier of any shortages or impairments. Any such claims should be filed with the carrier. The carrier, not the shipper, is responsible for shortages and damage to the shipment whether visible or concealed.

WARNING

All volume water heaters must be installed in accordance with the procedures outlined in this manual. The warranty does not apply to heaters not installed or operated in accordance with these procedures. Consult local building and safety codes before proceeding with work. The installation must conform to the requirements of the authority having jurisdiction or, in the absence of such requirements, to the latest edition of the National Fuel Gas Code; ANS1 Z223.1, National Electrical Code ANSI/ NFPA 70 and/or in Canada CAN1-B149 requirement. When required by the authority having jurisdiction, the installation must conform to American Society of Mechanical Engineers safety codes for controls and safety devices for automatically fired heaters No. CSD-1, and in Canada CGA 3.3. Any modification to the water heater, its gas controls, gas orifices, wiring or draft diverter may void the Laars warranty. If field conditions require such modifications, consult factory.

1B. Heater Identification

Consult rating plate on the heater. The following

example simplifies the heater identification.

1 2 3456

PW 1670 I N 09 C

1. Basic heater model.*

2. Input rate X 1000 BTU/hr.

3. Indoor (I) or Outdoor (E) installation.

4. Gas type: Natural (N) or Propane (P).

5. Ignition system: I.I.D. (09) or continuous pilot (16).**

6. Firing rate: On/Off (C), 2-stage (K), 4-stage (L).

Model VW water heaters for use with separate

storage tank. There must be a field installed pump to circulate water between the heater and the storage tank.

Model PW water heaters are basically the same

as the VW series except that the PW heaters come with integrally mount pumps.

Model IW water heaters are tankless

instantaneous heaters, complete with mount pump for use in applications having a suitable diversity in heater load.

Special Options: I.I.D. (04) 115 volts.

Laars commercial water heaters are available in

two models: an indoor version and an outdoor version. Both are available from the factory (see Figure 1).

295/

Pump

12¼

(311)

Gas

Conn.

Front

Top

Pump

(PH Models)

Gas

(483)

Inlet

(305)

Figure 1. Boiler Configuration.

Front

10¼

(260)

30¾

(781)

(1473)

(432)

7¾

(197)

(752)

Out In

(197)

28¼

(718)

Side

Out In

41¾

(1060)

Side

17¾

(356)

(102)

Rear

(737)

(1549)

Page 4

LAARS HEATING SYSTEMS

1C. Flow Requirements

For proper operation, all low volume hot water heaters must have continuous flow through the heat exchanger when firing. The system pump must be capable of developing sufficient pressure to overcome the resistance of the heater plus the entire circulating system at the designed flow rate.

1D. Water Chemistry

Laars equipment is designed for use in a wide variety of water conditions. The water velocity maintained in the heat exchanger tubes is kept high enough to prevent scaling from hard water and low enough to avoid corrosion from soft water. Ninetyfive percent of the urban areas in the country have water that is compatible with this equipment, but in some areas a water supply will contain a large quantity of scaling chemicals or the water may be extremely soft and corrosive. In rare situations the water will contain both scaling chemicals and corrosive chemicals such as calcium or sodium chloride. These conditions may be the result of a nearby well or pumping station and the particular condition may not be characteristic of the entire city water system.

If an installer observes damage from these conditions to any water handling equipment in the area, a factory representative should be contacted immediately for assistance in minimizing maintenance costs. If erosion is present, the pump impeller can be replaced to reduce water velocity. If scaling conditions are bad, tube cleaning maintenance schedules can be established to prevent tube burn-out and cracking. Neglecting the problem could mean serious damage to the heater and water system.

Scaling can be recognized as a layer deposited on the inner walls of the tube which reduces the inner diameter of the tube. Scale can be any color or texture; smooth or rough, granular or amorphous. Signs of erosion are generally pitting, cavitation, ridges and “islands” on the inner walls of the tubes. Since this condition results from extremely soft water sources, or as a result of a water softening program, the internal copper surfaces will be extremely shiny. Other chemicals, such as chlorine or chlorides in the water, will cause dark surfaces of erosion.

In areas where the water supply is extremely corrosive, it is advisable to order the heater with cupro-nickel tubes in the exchanger.

Damage From Scaling, Corrosion, or Erosion is Not Covered by the Warranty.

SECTION 2. Installation

2A. Heater Placement

The heater must be placed to provide specific clearances on all sides for maintenance and inspection. There must also be minimum distances maintained from combustible surfaces. These clearances also apply to non-combustible materials because the heater requires air circulation for proper operation.

Heater should be mounted on a level surface. An integral combustible flooring base is provided as standard equipment on can be installed on a combustible floor with a special base assembly which is available from the factory, or with a base that complies with local code requirements. See rating plate for part number of the base assembly.

Do not install a heater on carpeting.

Under the National Fuel Gas Code, ANSI Z223.1, it is permissible to place the heater on floors other than non-combustible when the installation complies with the American Insurance Code. Figures 2, 3, 4 and 5 show common installation on combustible flooring.

2B. Installation of Indoor Heaters

1. Locate the water heater to provide adequate

clearance for inspection and service on all sides

(see Table I). We recommend minimums of 24"

from front (for proper access to and service of

controls) and 18" at water connection end. For

alcove installation (see Figure 6).

2. Install the heater on a waterproof floor with an

adequate floor drain and a 6" minimum curb on

all four sides to protect the building if heater

repairs are required. The manufacturer will not

be held liable for any water damage in

connection with this heater.

Clearance Indoor Outdoor From (inches) (inches)

Top 30 unobstruct Water Conn. Side 12 24 Opposite Side 6 24 Front Alcove Unobstruct Rear 8 24 Vent Pipe* 6 — Hot Water Pipes Per Code Per Code

*1" when using type B V ent (refer to Manufacturer's Instructions

Table 1. Minimum Boiler Clearances

From Combustible Surfaces.

outdoor models. Indoor models

Mighty Therm Volume Water Heater

12345678901234567890

Figure 2. Typical Heater Installation with Base for Combustible Floors, Example A.

Page 5

Figure 3. Typical Heater Installation with Base for Combustible Floors, Example B.

Figure 5. Installation on Concrete Blocks or Tile.

234567890123456789

CLOSET INSTALLATION

(UNACCEPTABLE)

A closet is any 4 sided enclosure which is less than 16 volume of all the gas fired appliances within the enclosure.

2345678901234567890

Water

Heater

times the total

234567890123456789

Water

Heater

ROOM INSTALLATION

(ACCEPTABLE)

A room is any enclosure which is at least 16

times greater than the total

volume of all the gas fired appliances within the enclosure.

ALCOVE INSTALLATION

(ACCEPTABLE)

An alcove suitable for the installation of a water heater is a restricted section of a room not separated from the room by a door or partition and which meets the minimum clearances for the specific model water heater listed below.

Figure 4. Typical Heater Installation with Base for Combustible Floors, Example C.

When the ceiling height exceeds 8 feet, you are only allowed to

consider 8 feet when calculating the total volume of the enclosure.

Figure 6. Alcove Installation.

Page 6

LAARS HEATING SYSTEMS

2B-1. Combustion Air Supply

1. The heater location must provide sufficient air supply for proper combustion and ventilation of the surrounding area as outlined in the latest edition of ANSI standard Z223.1, and any local codes that may be applicable. Inadequate combustion air supply may result in incomplete combustion, sooting of the heat exchanger, and unsafe operation of the heater.

2. In general, these requirements specify that small heater rooms should be provided with two permanent air supply openings communicating directly through the wall to outside air; one within 12 inches of the ceiling, and the other within 12 inches of the floor. Each opening should have a minimum free area of one square inch per 4,000 BTUH input of the total input rating of all appliances in the enclosed area. See Table 2 for recommended air supply for each model. An improperly ventilated equipment room can get excessively hot and cause accelerated deterioration of controls and electrical components.

IMPORTANT: In beauty shops, barber shops,

cleaning establishments and self-service laundries with dry cleaning equipment, it is important that the water heater be installed in a location where

Heater Each Opening*

Model (Square Inches)

combustion and ventilation air is received from a source outside the building. Please refer to the most recent edition of the National Fuel Gas Code, ANSI Z223.1, or in Canada, CGA requirements.

3. (a) In the United States: Exhaust Fans or Vents:

Any equipment which exhausts air from the heater room can deplete the combustion air supply or reverse the natural draft action of the venting system. This could cause flue products to accumulate in the heater room. Additional air must be supplied to compensate for such exhaust. The information in Table 2 is not applicable in installations where exhaust fans or blowers of any type are used. Such installations must be designed by qualified engineers. (b) In Canada: Follow Canadian standard, CANI-B149or local codes.

4. If a blower or fan is used to supply air to the heater room, the installer should make sure it does not create drafts which could cause nuisance shutdowns of the pilot. If a blower is necessary to provide adequate combustion air to the heater, a suitable switch or equivalent must be wired into the heater control circuit to prevent the heater from firing unless the blower is operating.

5. The heater must be completely isolated and protected from any source of corrosive chemical fumes such as trichlorethylene, perchlorethylene, chlorine, etc.

500 125 600 150 715 179

850 213 1010 253 1200 300 1430 358 1670 418 1825 457

*Net Free Area in Square Inches

Area indicated is for one of two openings; one at floor level and one at the ceiling, so the total net free area could be double the figures indicated. For special conditions refer to the latest edition of ANSI Z223.1.

Consult factory if not communicating directly through the walls with the outdoors.

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 2. Minimum Recommended

Air Supply to Boiler.

2B-2. Venting

1. Laars heaters have built-in draft diverters for natural draft operation and must not be connected to any portion of a mechanical draft system under positive pressure. The flue outlet must be connected to a clear, unobstructed vent of adequate capacity ending above the highest point of the building with an approved vent cap. The venting system should be installed according to the latest edition of ANSI Z223.1 and/or, in Canada, CAN1-B149 requirement and any local codes having jurisdiction.

IMPORTANT NOTE: Do not use sheet metal screws at the snap lock joints of Type B gas vents.

2. Do not weld or fasten the vent pipe to the heater draft hood. The weight of the stack must not rest on the heater.

The draft hood and heater top must be easily removable for normal heater service and inspection.

3. Avoid using long horizontal runs of the vent pipe, and too many 90° elbows, reductions or restrictions. Horizontal runs should have at least a 1/4" rise per foot in the direction of flow. A vent connector should be supported for the design and weight of the material used to

Mighty Therm Volume Water Heater

maintain clearances and prevent physical damage and separation of joints.

4. Avoid ending heater vents near air conditioning or air supply fans. The fans can pick up exhaust flue products from the heater and return them inside the building, creating a possible health hazard. A minimum of 4 feet horizontal distance must be maintained from electrical meters, gas meters, and relief equipment.

5. Always use double-wall or insulated vent pipe (Type B or equivalent). In cold weather, uninsulated outside vents can chill the rising flue products, blocking the natural draft action of the venting system. This can create a health hazard by spilling flue products into the heater room.

6. Avoid oversize vent piping or extremely long runs of the pipe which may cause excessive cooling and condensation. Rule of Thumb: The total length of the vent, including the connector and any offset, should not exceed 15 feet for every inch of vent diameter. Longer total lengths shown in venting tables are based on maximum capacity, not condensation factors.

7. When the installation of a draft fan is necessary in connecting a venting system to a Laars heater, the installation should be engineered by competent personnel following good engineering practices. The draft fan supplier should be consulted for correct size. The installation should be in accordance with the latest edition of ANSI Z223.1 and/or, in Canada, CAN1-B149 requirement and any local codes having jurisdiction. When a draft fan is installed, a suitable draft switch must be wired into the heater control circuit at terminal designated “Field Interlock” to prevent firing of the heater unless a positive draft has been established.

Page 7

Figure 7. Incorrect Outdoor Installation.

the danger of freezing exists unless proper precautions are taken for freeze protection.

2D. Gas Supply and Piping

Review the following instructions before

proceeding with the installation.

1. Verify that the heater is fitted for the proper type of gas by checking the rating plate. Laars heaters are normally equipped to operate below a 2000 foot altitude. Heaters equipped to operate at higher altitudes have appropriate stickers or tags attached.

2. Use the figures in Table 3 to provide adequate gas piping from the gas meter to the heater.

3. A trap (drip leg) must be provided ahead of the gas controls (see Figure 8 ). A manual gas shutoff valve must also be provided for service convenience and safety. Check the local codes.

2C. Installation of Outdoor Heaters

1. Locate the heater to provide the minimum clearances as listed in Table 1, “Placement of Heater”.

2. Do not place the heater in an enclosure or wall recess. Avoid locations where wind deflection off structures might cause down draft. When such wind conditions are possible, place the heater at least three (3) feet from the structures.

3. Never install the heater under any kind of roof overhang. Do not place the heater below or adjacent to any doors, windows, louvers, grills, etc. which connect in any way with an inhabited area of a building. This includes other structures such as garages or utility rooms (see Figure 7).

4. Although these models are AGA and CGA designed certified for outdoor installations, such installations are not recommended in areas where

Distance from G as Meter

or Last Stage Regulator

Size 0-100' 100-200' 200-300'

500 600 715

850 1010 1200 1430 1670 1825

Note: These figures are for Natural Gas (.65 Sp. Gr.), and are based on 1/2" water column pressure drop. Check supply pressure with a manometer, and local code requirements for variations. For LPG, reduce pipe diameter one size, but maintain a 1" minimum diameter. A normal number of Tees and elbows have been taken into allowance.

1-1/2" 1-1/2"

2" 2"

2" 2-1/2" 2-1/2" 2-1/2" 2-1/2"

Table 3. Gas Piping Sizes.

2" 2"

2" 2-1/2" 2-1/2"

2" 2-1/2" 2-1/2" 2-1/2"

3" 3-1/2"

Page 8

Figure 8. T-Fitting Sediment Trap Installation.

4. The boiler and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1/2 psig. The boiler must be isolated from the gas supply piping system by closing its individual manual gas shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psig.

5. Provide gas supply pressure to the heater as follows:

LAARS HEATING SYSTEMS

Caution

Since some leak test solutions (including soap and water) may cause corrosion or stress cracking, the piping must be rinsed with water after testing, unless it has been determined that the leak test solution is noncorrosive.

2E. Electrical Wiring

WARNING

The heater must be electrically grounded in accordance with the most recent edition of the National Electrical Code, ANSI/NPA 70. In Canada, all electrical wiring to the heater should be in accordance with the Canadian Electrical Code, CSA C22.1 Part 1. Do not rely on the gas or water piping to ground the metal parts of the heater. Oftentimes, plastic pipe or dielectric unions isolate the heater electrically. Service and maintenance personnel who work on or around the heater may be standing on wet floors and could be electrocuted by an underground heater.

Natural Gas LPG

Min. (inches water column)

Max. (inches water column)

Per Rating Plate

9 14

Note: The heater and all other gas appliances

sharing the heater gas supply line must be firing at maximum capacity to properly measure the inlet supply pressure. Low gas pressure could be an indication of an undersized gas meter and/or obstructed gas supply line.

6. The correct burner manifold gas pressure is stamped on the rating plate. The regulator is preset at the factory and normally requires no further adjustment.

7. The gas manifold and control assembly was tested and conform to the safe lighting and other performance criteria specified in the latest editions of ANSI Z21.13 and CGA 3.3 Low Pressure Boiler Standard.

8. Before operating the boiler, the complete gas supply system and all connections must be tested for leaks using a soap solution. Do not use raw flame.

1. Check heater wiring and pump for correct voltage, frequency and phase. If the pump circuit is other than 115V, check to see that the heater is provided with an appropriate transformer.

2. Wire the heater and pump exactly as shown in the wiring diagram supplied with the heater.

3. The pump and heater must be electrically interlocked so the heater cannot come on unless the pump is running.

4. All field installed electrical safety devices and all field installed devices (draft switches, relays, timers, outdoor temperature reset devices, etc.) can be connected to the heater wiring at points shown in the wiring diagram designated “Field Interlock”.

2F. Water Piping of System

1. Be sure to provide valves at the inlet and outlet of the boiler so it can be readily isolated for service. A butterfly or similar type of valve is recommended.

2. The pressure relief valve installed in the tapped opening provided in the outlet header (see Figure 9), must be piped, but not fastened, to a drain or floor sink. The drain pipe must be the same size as the valve outlet and must pitch downward from the valve.

Mighty Therm Volume Water Heater

Figure 9. Pressure Relief Valve Location.

Special attention must be given to relief valve settings in installations where the heater is located on the ground floor of a tall building. The static pressure of the system is elevated and could cause the relief valve to leak. Where no

special setting of the relief valve is ordered, the factory will furnish a 125 psi setting. Never

reduce the relief valve openings.

3. Pressure relief valve lever must be tripped at least once a year to insure that waterways are clean. When manually operating lever, water will discharge through drain line. Precautions must be taken to avoid contact with hot water and water damage.

4. The weight of all water and gas piping should be supported by suitable hangers or floor stands.

5. Check piping diagrams with local applicable plumbing, heating and building safety codes.

6. All two-temperature systems using temperature valves must have forced recirculation in the low temperature building loop.

7. A check valve installed at the hot water inlet to the tempering valve will prevent cold water from being drawn in reverse through the tempering valve into the hot water.

8. When installing a tempering valve, place at bottom of antithermosyphon loop at least 24" high to prevent excessive hot water from entering mixed water supply. Bring the cold water supply up from the floor to the valve (see Figure 10).

Page 9

Figure 10. Tempering Valve Installation.

2G. Water Expansion

When cold water is heated the water expands. If no water is being used during the heat-up period the expanded water will normally back up into the city mains.

A water pressure reducing valve installed in the incoming cold water line may act as a check valve and prevent the expanded water from moving backward. This will cause pressure to rise in the heater, which will be relieved by the pressure relief valve.

If the relief valve pops frequently a mineral deposit may build up on the valve seat, causing it to leak.

The following suggestions may solve the problem:

1. Install a properly sized expansion tank.

2. Replace the installed water pressure reducing valve

with a suitable valve having a back flow port. These

valves have a back flow port which allows water

to flow backwards when the pressure in the system

exceeds the pressure in the mains.

3. Install a check valve around the pressure reducing

valve to permit reverse flow. This will allow

the expanded water to back flow into the mains.

4. Install an auxiliary small relief valve set at 25 psi

less than the main relief valve. The valve must be

piped to a drain and may require occasional

cleaning. It will bleed off the expanded water

and protect the main pressure relief valve from

becoming fouled.

Page 10

LAARS HEATING SYSTEMS

2H. Pump Performance and Installation

1. The factory provided pump on PW heaters and

the recommended field provided pump for model VW heaters are sized to provide proper circulation through the heater and heater-totank circulation loop (see Figures 11 and 12). If the heater-to-tank circulating loop does not

contain more than 6 elbows or 30 feet of pipe, use pipe fittings in the loop no smaller

than the following:

Model Pipe Size

500 through 850 2"

1010 through 1825 2-1/2"

If the heater-to-tank circulating loop contains more than 6 elbows or 30 feet of pipe, use pipe or fittings in the loop no smaller than the following:

Model Pipe Size

500 through 850 2-1/2"

1010 through 1825 3"

To assure free circulation, do not use globe valves, side outlet tee connections or other restrictive fittings in heater-to-tank loop.

2. The Model IW heater is designed for use in a

system without a hot water storage tank. The hot water supply line to usage point must have a return leg to the heater (see Figure 13, 14 and

15). A built-in circulating pump and internal heat exchanger bypass maintains the heater in a standby condition. It also maintains the temperature at the controller setting of the water in the entire building circulating loop whether or not there is any use of hot water.

Minimum

Reservoir Equivalent Pipe

Model IW Gallons* Size and Length

500 through 850 ...............6.3 ................. 1 1/4" x 100 ft.

1010 through 1220 .........10.2................. 1 1/2" x 100 ft.

1430 through 1670 .........17.0....................... 2" x 100 ft.

1825................................27.0................. 2 1/2" x 100 ft.

* The gallons shown are the calculated volumes of the pipes.

4. Model VW, PW and IW heaters are not suitable

for heating swimming pools or any other application where temperature of the water flowing through the heater remains below the dew point (110°F).

In applications requiring the rapid use of measured volumes of water, the recovery of the heater between the time intervals of use must equal the volume used. See the recovery table in the current Document 2045 (Submittal Data).

5. Pump Sizing: A suitable pump must be fieldprovided for circulation of water between Model VW heaters and the storage tank. This pump must be sized to avoid excessive temperature rise and to provide correct flow for water hardness conditions. Specifications in Table 4 include allowance for 30 feet of piping and normal fittings between heater and tank.

6. Install pump in a cool location. When pump is installed where it is subjected to excessive heat, the life of the pump will be shortened. Heat will embrittle motor insulation and dry out bearing lubricants. If the pump motor is equipped with thermal protection, excessive heat may trip the thermal switch and shut down the pump intermittently. This could result in rapid scaling of the heater.

A separate circulating pump is required for circulation of water in the building loop. The control system provides variable heat inputs to match periods of higher or lower water consumption.

3. The Model IW heater requires a minimum of

circulating hot water in the building circulation loop. To prevent excessive temperature fluctuations in the delivered water, the whole building system, including the return loop, must have the equivalent volume of pipe shown below:

IMPORTANT: Check oil level in pump before

starting. Oil pump every three (3) months. Fill bearing assembly to lower level of overflow vent. Add five (5) or six (6) drops of oil to front and rear of motor. Use 20W non-detergent oil. Pumps located in excessively hot or dusty locations should be oiled once a month. Self lubricating pumps do not require oiling.

7. The pump should be accessible for lubrication, inspection and service.

8. If pump is designed for floor mounting, install securely on concrete block or pad at least six (6) inches above floor level. This will prevent flooding of motor when floor is washed. Be sure that floor mounted pumps are not suspended from piping and that piping is plumbed to avoid strain on the pump casing.

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