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Lochinvar

INLET AND OUTLET WATER CONNECTIONS

For ease of service, install unions on inlet and

outlet of the water heater. The connection on the

unit marked “Inlet” should be used for return

water from the storage tank. The connection on

the header marked “Outlet” should be

connected to the inlet of the storage tank. (See

Appendix A Water Heater Piping diagrams).

WATER VELOCITY CONTROL

IMPORTANT

To ensure proper velocity through the heat

exchanger, it is necessary to regulate the

temperature rise across the heat exchanger from

inlet to outlet. (This 

MUST

be done on initial

installation and periodically rechecked.) 

With the correct temperature rise across the heat

exchanger (See TABLE I), you may be assured of

the proper velocity in the tubes and long life and

economical operation from the water heater.

LOW WATER TEMPERATURE
DELIVERY

A number of water heating applications may

require delivered water temperature in a system

below 140°F. Systems such as nursing homes

and hospitals would be examples of this type of

system. A water heating system that will be

operated at less than 140°F 

MUST

use a

mixing valve 

on the outlet side of the storage

tank in order to ensure that the products of
combustion do not condense inside the
combustion chamber of the water heater. The

mixing valve allows the water heater to operate

above 140°F to protect from condensation, while

still allowing a delivery of colder water to the

system fixtures. Also inherent in this design is the

protection of occupants from water containing

bacteria such as Legionella. Legionella can be

significantly reduced in the water storage vessel

by heating the water to a minimum of 140°F.

(See Appendix A for piping details.)

PUMP OPERATION

The water heater 

MUST

be connected

with a properly sized and installed,

intermittent operating, all bronze pump that

circulates water between heater

and storage tank.

Pump is sized to heater input and water

hardness. Should water hardness exceed 25

grains/350 TDS per gallon, consult factory

for pump sizing.

The pump chart (Table J) is based on the

following fittings:

6-90° elbows

2 unions

2 ball valves

1 cold water supply tee

Due to pump capacity the following specifications cannot
be exceeded when using the standard pump:

•Not more than 45 feet of straight pipe

1.

2.

NOTE:

A larger pump 

MUST be utilized in

situations where the

distance between the

water heater and tank

exceed those specified.

(TABLE I) – REQUIRED TEMPERATURE RISE

MODEL NUMBER

TEMPERATURE RISE °F

EW 150

4.6

EW 200

6.2

EW 250

7.7

EW 300

9.3

NOTE:

Care should be 

taken to measure

temperature rise 

and maintain proper

water velocity in the

heat exchanger.

Содержание EW 150

Страница 1: ...DESIGNER S GUIDE EFFICIENCY WATER HEATER 1 5 0 0 0 0 3 0 0 0 0 0 B t u h r ...

Страница 2: ...uccinct easy to use manner so you can use and share information confidently and with minimal effort However it is important to remember that this guide is not intended to replace our installation manual Installers should still refer to our installation manual for specific installation instructions We hope our manual will make your work easier and more productive As always we greatly appreciate you...

Страница 3: ...Aire Vent With Rooftop Air Inlet 10 FIG 10 Horizontal Direct Vent 12 FIG 11 Horizontal Direct Vent Caps 12 FIG 12 Multiple Sidewall Direct Vent Caps 13 FIG 13 Vertical Direct Vent 13 FIG 14 Outdoor Venting 14 TABLE A Clearances From Combustible Construction 3 TABLE B Conventional Venting Vent Connection Size 8 TABLE C E DirectAire Vent Kits 10 TABLE D Horizontal Direct Vent Kits 12 TABLE E Vertica...

Страница 4: ...tallation MUST comply with the Canadian Gas Association Code CAN CGA B149 1 and or B149 2 and or local codes LOCATION OF UNIT Locate the unit so that if water connections should leak water damage will not occur When such locations cannot be avoided it is recommended that a suitable drain pan adequately drained be installed under the unit The pan MUST NOT restrict combustion airflow Under no circum...

Страница 5: ... in accordance with Section 5 3 Air for Combustion and Ventilation of the latest edition of the National Fuel Gas Code ANSI Z223 1 or in Canada the latest edition of CGA Standard B149 Installation Code for Gas Burning Appliances and Equipment or provisions of the local building codes 3 5 4 L o c h i n v a r D E S I G N E R S G U I D E E F F I C I E N C Y WAT E R H E AT E R 6 1 5 8 8 9 8 9 0 0 3 TA...

Страница 6: ...f the two openings should be sized based on a minimum free area of one square inch per 2000 Btu hr 11 cm2 per kW If air is taken from another interior space each of the two openings specified above should have a net free area of one square inch per 1000 Btu hr 22 cm2 per kW input but not less than 100 square inches 645 cm2 Lochinvar 2 FIG 4 COMBUSTION AIR FROM AN INTERIOR SPACE FIG 3 COMBUSTION AI...

Страница 7: ...building codes The connection from the appliance vent to the stack MUST be as direct as possible and sized correctly using the proper vent table The horizontal breaching of a vent MUST have at least 1 4 rise per linear foot The horizontal portions shall also be supported for the design and weight of the material employed to maintain clearances prevent physical damage and separation of joints The c...

Страница 8: ... Flue gas condensate can freeze on exterior walls or on the vent cap Frozen condensate on the vent cap can result in a blocked flue condition Some discoloration to exterior building surfaces can be expected Adjacent brick or masonry surfaces should be protected with a rust resistant sheet metal plate Vent connectors serving appliances vented by natural draft shall not be connected to any portion o...

Страница 9: ...as appliances An interior masonry chimney which is not exposed to the outdoors below the roofline may be used to vent high efficiency gas appliances based on the results of careful inspection proper sizing and local code approval If there is any doubt about the sizing or condition of a masonry chimney it MUST be relined with a properly sized and approved chimney liner system An interior masonry ch...

Страница 10: ...h unit is installed with an individual vent and the negative draft is higher than the specified range of 0 02 to 0 05 inches of water column a barometric damper will be necessary Multiple unit installations with combined venting require barometric dampers to regulate draft at each unit The negative draft MUST be within the range of 0 02 to 0 05 inches of water column to ensure proper operation All...

Страница 11: ...y I Type B vent material for venting flue products The sidewall or vertical roof top E DirectAire Vent combustion air supply system has specific vent material and installation requirements The air inlet pipe connects directly to the water heater to supply combustion air In most installations the combustion air inlet pipe will be a dedicated system with one air inlet pipe per water heater Multiple ...

Страница 12: ...alled at the point of termination for the air inlet pipe The point of termination for the combustion air inlet cap MUST be at least 2 feet 0 6 m below the point of flue gas termination vent cap if it s located within 10 feet 3 05 m of the flue outlet The termination ell on the air inlet MUST be located a minimum of 12 0 30 m above the roof or above normal levels of snow accumulation It MUST NOT be...

Страница 13: ...a two pipe system one pipe for the flue products and one pipe for the combustion air supply The flue CANNOT be combined with any other appliance vent or common vent from multiple water heaters The vent on a direct vent system will have a positive pressure in the flue which requires all vent joints and seams to be sealed gas tight The flue from a direct vent system MUST have a condensate drain with...

Страница 14: ...e Place the combustion air inlet cap at least 1 foot 0 3 m above ground level and above normal snow levels MULTIPLE UNIT APPLICATIONS Horizontal Direct Vent The combustion air inlet caps for multiple unit installations MUST maintain the minimum 3 foot 0 9 m radius clearance below or horizontally from the closest flue outlet Lochinvar 1 2 L o c h i n v a r D E S I G N E R S G U I D E E F F I C I E ...

Страница 15: ... 6m lower than the point of flue gas termination if it is located within 10 feet 3 05 m of the flue outlet Incorrect installation and or location of the air inlet cap can allow the discharge of flue products to be drawn into the combustion process on the water heater This can result in incomplete combustion and potentially hazardous levels of carbon monoxide in the flue products MULTIPLE UNIT APPL...

Страница 16: ... outdoor cap must be located 4 feet 1 22m below and 4 feet 1 22m horizontally from any window door walkway or gravity air intake The combustion air inlet of the outdoor cap must be located at least one foot 0 30m above grade and above normal snow levels The water heater must be at least 10 feet 3 05m away from any forced air inlet and at least 3 feet 0 91m outside any overhang Do not install in lo...

Страница 17: ... N C Y WAT E R H E AT E R 6 1 5 8 8 9 8 9 0 0 1 5 TABLE H INLET GAS PRESSURE REQUIREMENTS NAT GAS LPG MAX INCHES WATER COLUMN 10 5 w c 13 w c MIN INCHES WATER COLUMN 4 7 w c 8 w c EXAMPLE OF HIGH ALTITUDE APPLICATIONS For example if a unit s input is 200 000 Btu hr at sea level the rated input at 4000 feet of elevation can be calculated by derating input 4 per 1000 feet above sea level Btu hr Inpu...

Страница 18: ...rder to ensure that the products of combustion do not condense inside the combustion chamber of the water heater The mixing valve allows the water heater to operate above 140 F to protect from condensation while still allowing a delivery of colder water to the system fixtures Also inherent in this design is the protection of occupants from water containing bacteria such as Legionella Legionella ca...

Страница 19: ...ntent between 1 and 6 gallons of the copper finned tube heat exchanger a flow switch is factory installed as a low water cutoff device on models EW 150 through EW 300 The flow switch is installed in the outlet piping from the water heater and wired in series with the ignition system safety controls A flow switch is acceptable as a low water cutoff device on water heaters requiring forced circulati...

Страница 20: ...E F F I C I E N C Y WA T E R H E A T E R P I P I N G D I A G R A M S ...

Страница 21: ...VE TEE ELBOW UNION EXPANSION TANK CHECK VALVE THERMOMETER COLD WATER SUPPLY BUILDING RETURN INLET OUTLET LOCHINVAR WATER HEATER L E G E N D TABLE J COMMON WATER MANIFOLD PIPE SIZE FOR MULTIPLE WATER HEATER INSTALLATIONS QUANTITY OF WATER HEATERS MANIFOLD PIPE SIZE 1 2 2 3 3 31 2 4 4 5 5 6 6 This illustration is for concept only and should not be used for any actual installation without engineering...

Страница 22: ...G HOT WATER SUPPLY LOCHINVAR WATER HEATERS COLD WATER SUPPLY BUILDING RETURN LOCK TEMP STORAGE TANK DRAIN RELIEF VALVE OUTLET INLET This illustration is for concept only and should not be used for any actual installation without engineering or technical advice from a licensed engineer All necessary equipment may not be illustrated COMMON WATER MANIFOLD PIPE SIZE FOR MULTIPLE WATER HEATER INSTALLAT...

Страница 23: ...MPERATURE BUILDING RETURN DRAIN INLET OUTLET COLD WATER SUPPLY 1400 F HOT WATER SUPPLY 1800 F HOT WATER SUPPLY LOCK TEMP STORAGE TANK LOCHINVAR WATER HEATER MIXING VALVE CHECK VALVE RELIEF VALVE This illustration is for concept only and should not be used for any actual installation without engineering or technical advice from a licensed engineer All necessary equipment may not be illustrated COMM...

Страница 24: ...ET OUTLET INCREASE MANIFOLD SIZE IN DIAMETER FROM TEE TO TANK INCREASE MANIFOLD SIZE IN DIAMETER FROM TEE TO TANK BUILDING RETURN DRAIN LOCK TEMP STORAGE TANK COLD WATER SUPPLY BUILDING HOT WATER SUPPLY This illustration is for concept only and should not be used for any actual installation without engineering or technical advice from a licensed engineer All necessary equipment may not be illustra...

Страница 25: ...MP STORAGE TANK DRAIN INLET OUTLET OUTLET BUILDING HOT WATER SUPPLY INCREASE MANIFOLD SIZE IN DIAMETER FROM HERE TO POINT B INCREASE MANIFOLD SIZE IN DIAMETER FROM HERE TO POINT C THERMOMETER This illustration is for concept only and should not be used for any actual installation without engineering or technical advice from a licensed engineer All necessary equipment may not be illustrated COMMON ...

Страница 26: ... FRAME W WATER HEATERS AND STORAGE TANK LIT0665 A6 L o c h i n v a r D E S I G N E R S G U I D E E F F I C I E N C Y WAT E R H E AT E R 6 1 5 8 8 9 8 9 0 0 MODEL HEATER INLET MANIFOLD NUMBER OUTLET SIZE PIPE SIZE EW 150 300 2 3 ...

Страница 27: ......

Страница 28: ...Lochinvar Corporation 615 889 8900 Fax 615 547 1000 www Lochinvar com EW DG 03 5M 2 06 Printed in U S A ...

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