Bradford-White IGI-180C, IGI-180R User Manual

BRADFORD WHITE EVERHOT® TANKLESS GAS WATER HEATER

FOR INTERIOR INSTALLATION

IGI-180R AND IGI-180C MODEL SERIES

Ambler, PA 19002

Tech. Service (800) 334-3393 Service Part (800) 538-2020 Warranty Service (800) 531-2111

Part No.: 238-44958-00A

 Do not store or use gasoline or other

 WHAT TO DO IF YOU SMELL GAS

 Installation and service must be

WARNING: If the information in

these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury or death

flammable vapors and liquids in the vicinity of this or any other appliance

• 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 neighbor’s phone. Follow the gas supplier’s instructions.

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

performed by a qualified installer, service agency or gas supplier

INSTALLATION AND OPERATING INSTRUCTION MANUAL

PLACE THESE INSTRUCTIONS ADJACENT TO WATER HEATER AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE

A Spanish language version of these instructions is available by contacting the company listed on the rating plate.

La versión espãnola de estas instrucciones se puede obtener al escribirle a la fábrica cuyo nombre aparece en la placa de especificaciones.

SECTION I: IMPORTANT INFORMATION

This gas-fired water heater is design certified by CSA International under the American National Standard, Z21.10.3 (as indicated on the rating plate) and CAN/CGA 4.3-M (as indicated on the rating

late) available from CSA Standards Association, 178 Rexdale Blvd., Etobicoke, Ontario, Canad

M9W 1R3.

This water heater must be installed in accordance with local codes. In the absence of local codes, i must be installed in compliance with the National Fuel Gas Code (ANSI Z223.1-Latest Edition), or in Canada CAN/CGA B149.1 Natural Gas Installation Code (Latest Edition) or CAN/CGA B149.2 Propane Installation Code (Latest Edition).

The following terms are used throughout this manual to bring attention to the presence of hazards a 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.

This water heater has a limited warrant water heater has been installed, maintained and operated in accordance with these instructions.

READ CAREFULLY

CAUTION

Indicates potentially hazardous situation, which, if not avoided, may result in moderate or minor injury or property damage.

Indicates special instructions on installation, operation or maintenance, which are important but not related to personal injury hazards.

NOTICE

. The warranty for this water heater is valid only if the

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. Failure to properly install the vent and air intake (if applicable) system could result in property damage, personal injury, or death.

DO NOT install any damaged venting system components. If damage is evident then please contac the supplier where the water heater was purchased or the manufacturer listed on the rating plate fo replacement parts.

Use only vent terminals provided or factory authori zed terminals for venting this water heater.

This water heater is equipped with an adjustable thermostat to control water temperature. Hot wate temperatures required for automatic dishwasher and laundry use can cause scald burns resulting i 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

NEVER allow small children to use a hot water tap, or to draw their own bath water. NEVER

them. leave a child or disabled person unattended in a bathtub or shower.

WARNING

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 provided with the applianc e before installing, starting-up, operating, maintaining or servicing this appliance. Keep this manual an literature in legible condition with this water heater 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 a qualified, skilled an knowledgeable installer or service provider.

Installation is not complete unless a pressure relief valve is installed into the proper location in the ho water outlet piping of this water heater.

It is the responsibility of the installing contractor to see that all controls are correctly installed and are properly operating when the installation is complete.

DO NOT operate this water heater without first being certain it is filled with water.

WARNING

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

DO NOT operate water heater with jumpered or absent controls or safety devices.

DO NOT operate water heater if any external part has been under water. Immediately call a qualified service a including gas controls, which has been under water.

ency to inspect the appliance and to replace any part of the contro l system

DO NOT attempt to use this water heater with any gas other than the type listed on the ratin plate. Do not attempt to convert this water heater for use with a gas other than the type for which it is equipped. Failure to use the proper propert there are any questions.

damage, bodily injury, or death. Consult your local gas supplier or gas company i

as can create an unsafe condition resulting in

DO NOT operate this water heater if the input rate exceeds the rate shown on the water heater rating plate.

This water heater contains very hot water under high pressure. Do not unscrew any pipe fittings no attempt to disconnect any components of this water heater without positively assuring the water is cool and is not under 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 temperature gauges to determine the temperature. Do not touch any components unless they are cool.

This water heater must be properly vented and connected to an approved vent system in goo condition. DO NOT operate water heater with the absence of an approved vent system. A clean and unobstructed vent system is necessary to allow noxious fumes that could cause injury or loss of life to vent safely and will contribute toward maintaining the water heater’s efficiency.

This water heater is for indoor installation only. The supplied venting system must be used to supply outdoor air for combustion to the appliance.

This water heater requires its own separate venting system. DO NOT connect the exhaust vent into a existing vent pipe or chimney.

Water heater materials of construction, products of combustion and the fuel contain carbon monoxide, nitrogen oxides, aldehydes and/or other toxic or harmful substances which can cause death or serious injury and which are known to the state of California to cause cancer, birth defects and othe reproductive harm. Always use proper safety clothing , respirators and equipment when servicing o working nearby this water heater.

WARNING

Liquefied petroleum gases/propane gas is heavier than air and will remain at floor level if there is leak. Basements, crawl spaces, closets and areas below ground level will serve as pockets fo accumulation of leaking gas. Before lighting, smell all around the appliance area for gas. Be sure to smell next to the floor.

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!

Flammable items, pressurized containers or any other potential fire hazardous articles must never be

laced on or adjacent to the water heater. Open containers of flammable material must not be stored o

used in the same room with this water heater.

DO NOT USE AN INSULATION BLANKET WITH THIS WATER HEATER. This water heate meets or exceeds the ASHRAE/IES 90.1b (latest edition) standards with respect to insulation an standby loss requirements.

WARNING

TABLE OF CONTENTS

I IMPORTANT INFORMATION 2 VII GAS CONNECTIONS 29

II SPECIFICATIONS 6 VIII ELECTRICAL CONNECTIONS 32

III GENERAL INFORMATION 9 IX OPERATING INSTRUCTIONS 40

IV INSTALLATION INSTRUCTIONS 10 TEMPERATURE ADJUSTMENT 43

V WATER CONNECTIONS 13 X MAINTENANCE 48

VI VENTING 20 XI PARTS LIST 53

SECTION II: SPECIFICATIONS

Model No. IGI-180R-10N

IGI-180R-10X IGI-180C-5N IGI-180C-5X

Model No. IGI-180R-10N

IGI-180R-10X IGI-180C-5N IGI-180C-5X

Max.

Input

Rating Btu/hr.

180,000 15,000

Max.

Input Rating kW/hr.

52.7

Min.

Input Rating Btu/hr.

Gal/Min.

Min.

Input Rating kW/hr.

4.4

Liters/Hr

Max. Flow Rate @ Degree Temperature Rise

Temp

Rise

Flow Rate

First Hour

Supply Gal/Hr.

Max. Flow Rate @ Degree Temperature Rise

Temp

Rise

Flow Rate

Liters/

Min.

First Hour

Supply

40°F

7.7 5.1 3.8 3.1 2.6 2.2

462 306 228 186 156 132

22°C

29.1 19.3 14.4 11.7 9.8 8.3

1746 1158 864 702 588 498

60°F

33°C

80°F

44°C

100°F

56°C

120°F

67°C

140°F

78°C

Flow Rate vs Temperature Rise Curve for EVERHOT® IGI Model Series

*Note: The maximum flow is based upon a minimum water pressure of 30 PSI

EVERHOT® IGI Model Series Dimensions

SPECIFICATIONS

Dimensions (Inches) Height:

25 5/8”

(65.1 cm)

Clearances from

Combustible Materials:

Maximum/Minimum Gas

Input Rating, Btu/hr.

Thermal Efficiency 84%

Minimum/Maximum Gas

Supply Pressures:

Manifold Gas Pressure Natural Gas: 3.7” w.c. maximum input, 0.8” minimum input

Venting System Direct Vent, Power Vented, To be vented using specified coaxial vent

Temperature setting range:

Recommended Minimum

water supply pressure

Maximum Water Supply

Pressure

Electrical Rating 120 volts, 60 Hz,

Electrical Consumption Normal operation: 75 watts, Anti-frost protection (when required): 100 watts

Ignition System Direct Spark Ignition

Water Flow Control Water flow sensor, microprocessor controlled water flow solenoid, bypass

Noise Level 49 dbA

Weight 49 Lbs. (22 Kg)

Top of water heater: 6” (15.2 cm), Front: 6” (15.2 cm), Sides: 2” (5.1 cm),

Back: 0”, Floor: 12” (30.5 cm), Vent/Air Intake Connectors: 0”

180,000 maximum / 15,000 minimum for both Natural and L.P. Gases.

Natural Gas: Minimum: 6.0” w.c., Maximum: 10.5” w.c.

Propane Gas: Minimum: 10.0” w.c., Maximum: 13.5” w.c.

Propane Gas: 4.2” w.c. maximum input, 0.9” minimum input

96-160°F, Residential models, 96-180°F Commercial models with front

Width:

13 25/32”

(35 cm)

panel temperature control

20 PSI (50-80 PSI for maximum performance)

Depth:

8 13/16”

(22.4 cm)

components

150 PSI

solenoid

Outside Vent

Connection:

5” dia.

(12.7 cm)

Venting

Height: 2 21/32” (6.7 cm)

Above top of

cabinet

SECTION III: GENERAL INFORMATION

FEATURES

The Bradford White EVERHOT® IGI series tankless water heater is a high output, high efficiency appliance, which heats the water continuously as hot water is being drawn for use. Unlike tank type storage water heaters, this water heater does not store hot water. The burner operates whenever there is a demand for hot water and is off when the hot water flow stops. Hot water is continuously supplied for any length of time required, as long as the specified flow rates are not exceeded. There is no need to set the temperature higher than required for sufficient capacity. The EVERHOT water heater has sufficient capacity to supply several hot water faucets simultaneously. The hot water flow capability will be dependent upon the temperature of the outlet water selected. More detail can be found at the beginning of Section II, “Specifications” section in this Installation and Operating Instruction Manual. Your plumbing professional should determine your hot water requirements before installing this water heater to be sure the capacity is sufficient for your application.

• The IGI series water heaters are designed to be installed on or near an outside wall for indoor installation only. The water heater is compact (23 1/2” (59.7 cm) H x 13 5/8” (34.6 cm) W x 8” (20.3 cm) D) and mounts on a wall using the supplied wall bracket. No floor space is needed and the water heater can be mounted at a height convenient for servicing.

• The weight is less than 50 pounds (23 Kg) and can be installed by 1 person.

• The burners ignite within 3 seconds of water flow (1/2 gallon/minute (1.9 L/m) minimum) by direct

spark ignition. There is no standing pilot.

• A variable speed combustion air blower forces the combustion air supply into the burner compartment.

• D irect vent design uses only outside air for comb ustion. The venting system is a coaxial design requiring a single 5 1/4” (13.3 cm) hole through the outside wall or roof. Vent pipe fittings have internal gaskets for a tight seal to prevent leakage of flue products and combustion air.

• The burner flame is continuously monitored and modulated to match the heating requirements of the water flow. Temperature and flow sensors continually monitor the water flow and outlet water temperature and adjust the burner and combustion air blower to maintain temperature.

• The IGI model series have a digital temperature control integrally mounted to project through the front panel of the water heater. The outlet water temperature is adjustable from 96-160°F for residential models (IGI-180R series) or 96-180°F for commercial models (IGI-180C series). The front panel temperature control also displays fault codes if the water heater malfunctions to assist with servicing the water heater. No installation is required for the main temperature control.

• In addition to the main temperature controller, up to two optional bathroom temperature controls are available on the residential models for setting the water temperature in the bathroom fixtures up to 120°F.

• The heat exchanger coil is provided with anti-freeze heaters for protection in cold climate conditions to ambient temperatures as low as -30°F (-34°C). Drain solenoids should be installed to drain the water heater in the event of a power failure.

• The water heater is very quiet in operation.

SECTION IV: INSTALLATION INSTRUCTIONS

INSTALLATION OF THIS WATER HEATER REQUIRES ABILITY EQUIVALENT TO THAT OF A LICENSED PLUMBER. PLUMBING, AIR SUPPLY, VENTING, GAS SUPPLY AND ELECTRICAL WORK ARE REQUIRED.

DO NOT ATTEMPT TO LIGHT ANY GAS APPLIANCE IF YOU ARE NOT CERTAIN OF THE FOLLOWING:

• Liquefied petroleum gases/propane gas and natural gas have an odorant added by the gas supplier that aids in detection of the gas.

• Most people recognize this odor as a “sulfur” or “rotten egg” smell.

• Other conditions, such as “odorant fade” can cause the odorant to diminish in

intensity, or “fade”, and not be as readily detectable.

• If you have a diminished sense of smell, or are in any way unsure of the presence of gas, immediately contact your gas supplier from a telephone in anothe building.

• Gas detectors are available. Contact your gas supplier or plumbing professional for more information.

Liquefied petroleum gases/propane gas is heavier than air and will remain at floor level i there is a leak. Basements, crawl spaces, closets and areas below ground level will serve as pockets for accumulation of leaking gas. Before lighting, smell all around the appliance area for gas. Be sure to smell next to the floor. 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!

This water heater must be located in an area where leakage of the heat exchange coil, water line connections, or the pressure relief valve will not result in damage to the area adjacent to the water heater or to lower floors of the structure. When such locations cannot be avoided, a suitable drain pan must be installed under the wate heater. The drain pan depth must be suitable for draining and collecting water, and have a minimum length and width of at least four (4) inches (10.2 cm) measured from the jacket of the water heater. The drain pan, as described above, can be purchased from your plumbing professional. The drain pan must be piped to an adequate drain. The piping must be at least ¾ inch (1.9 cm) in diameter and pitched for proper drainage.

WARNING

• This water heater is suitable for potable water heating only. DO NOT use this water heater for space heating or combination space heating/domestic water heating.

• This water heater is not suitable for use in pool or spa applications.

• The water heater must be installed indoors using the proper venting

system components for combustion air supply and discharging flue products to the outdoors. Contact the supplier of this water heater or Bradford White for venting components.

• DO NOT operate this appliance without the vent piping connected.

• All pipe joints should be taped to help prevent leakage around joints.

WARNING

Pressure relief valve discharge piping must be piped near floor to eliminate potential of severe burns. Do not pipe in any area where freezing could occur. Do not install any shut-off valves, plugs or caps to the temperature and pressure relief valve or piping.

CAUTION

If building cold water supply has a back-flow preventer, check valve or water meter with check valve, provisions for thermal expansion of water in the hot water system must be provided.

DANGER

Temperature setting should not exceed safe temperature at fixtures. See water temperature control warning in the “Temperature Adjustment” section of this Installation and Operating Instruction Manual. If higher preheat temperatures are necessary to obtain adequate booster output, add an ASSE approved mixing valve for hot water supplied to fixtures.

UNPACKING INSPECT SHIPMENT carefully for any signs of damage.

1. All equipment is carefully manufactured, inspected and packed.

2. Any claims for damage or shortage in shipment must be filed immediately with Bradford White Corporation and noted on the Bill of Lading.

3. Open the vent kit carton (shipped separately) and inspect the venting components for damage.

WATER HEATER LOCATION:

1. The IGI series water heaters may be vented either horizontally through an outside wall or

vertically through the roof using the venting components designed for this water heater. Contact your Bradford White supplier to order the required venting components. The venting system should be as short as possible. Refer to the Venting System Installation section of this Installation and Operating Instruction Manual for the vent terminal location restrictions before choosing a final location for the water heater.

2. The water heater must be installed on a wall capable of supporting at least 50 pounds (23 Kg).

Locate the water heater at a height convenient for servicing and above the reach of small children.

3. Minimum clearance to combustible material is 6” (15.2 cm) from the Top and Front, 0” from the

Rear, 2” (5.1 cm) from the Sides, 12” (30.5 cm) from the Bottom, and 0” from the Vent

Connectors of this water heater. However, it is recommended that at least 12” (30.5 cm) from the top and 24” (61 cm) from the front be provided for servicing.

4. If the water heater is installed in a confined space, such as a closet, ventilation air must be

provided to prevent increased room temperature. Excessive ambient temperatures surrounding the water heater may shorten the life of the controls.

REMOVE CARTON

Move water heater to a location near where it will be installed. Carefully slide water heater out from the carton and remove all the contents.

MOUNT WATER HEATER ON THE WALL

Determine the proper height and location for the water heater to be installed. Consider the venting system as well as the water and gas connections. Allow enough room for servicing the water heater and maintain the clearances from combustible materials previously stated. The water heater is supported on the wall by means of a top and bottom slotted angle bracket. For convenience, the center hole of the bracket is slotted so that a center screw may be first installed in the wall for hanging the water heater on the wall. Two more screws are then added on the ends of the bracket to secure the water heater. Wall anchors should be used for the bracket holes unless the bracket lines up with a stud. As an alternative, a suitable piece of plywood may be cut to span the wall studs and the brackets fastened to the plywood. Make sure the anchors are rated to support the 50 pound (23 kg) weight of the water heater.

SECTION V: WATER CONNECTIONS

WARNING

Failure to install and maintain a new, listed pressure relief valve will release the manufacturer from any claim, which might result from excessive temperature and pressures.

Keep clear of the pressure relief valve discharge line outlet. The discharge may be hot enough to cause scald injury. The water is under pressure and may splash.

WARNING

DO NOT reverse the inlet and outlet (cold and hot water) connections on the water heater. This may cause a hazardous operating condition or the water heater may be inoperabl e

WATER QUALITY

The EVERHOT® water heater must have the water quality within the following limits for long life and reliable operation. The water supply should be tested to make sure the quality is within the specified limits. If there is a problem with the water quality, contact your local water conditioning company for equipment to condition the water supply to this appliance.

NOTICE

Operating this water heater with water conditions outside the specified limits will void the warranty.

Description

Maximum

Levels

Lime Condition Warning Signal:

If the EVERHOT® water heater is operated under hard water conditions without a water conditioner, the error code “LC” may flash on the remote temperature display. This code means the heat exchanger coil is beginning to accumulate scale deposits and MUST be flushed (see Section X, “Flushing Procedure for Lime Scale Removal…”). Contact your installer for a qualified service technician to flush the heat exchanger. A water conditioner may be needed to prevent this condition from reoccurring.

pH TDS

(Total

Dissolved

Solids)

6.5 to

8.5

Up to

500 ppm

Total

Hardness

Up to

200 ppm

or 11.7

grains

hardness

Aluminum Chlorides Copper Iron Manganese Zinc

Up to 0.2

ppm

Up to

250 ppm

Up to

1.0

ppm

0.3

ppm

Up to 0.05

ppm

to 5

ppm

NOTICE

Failure to flush the appliance when “LC” is flashing will cause damage to the heat exchanger. Damage caused by lime or scale build up is not covered by the water heater warranty.

INSTRUCTIONS FOR CONNECTIONS

1. BEFORE PROCEEDING WITH THE INSTALLATION, CLOSE THE MAIN WATER SUPPLY VALVE. After shutting off the main water supply, open a faucet to relieve the water line pressure to prevent any water from leaking out of the pipes while making the water connections to the water heater. The COLD water inlet and HOT water outlet are identified on the bottom casing of the water heater. Make the proper plumbing connections between the water heater and the

plumbing system to the house. All soldering materials and piping must be compatible with potable water. Unions should be installed on both the hot and cold water lines for future servicing and disconnection of the water heater. Install a shut-off valve in the cold water supply line.

2. In order to service the water heater in the event the heat exchanger needs to be flushed of lime deposits, tee fittings with shut off valves and service connections to hoses should be installed. Also install a shut off valve to the hot water supply to isolate the service tee fittings. A plumbing installation kit, which includes these fittings and a pressure relief valve, is available from your supplier. Refer to the piping diagrams (fig. 1-4) in Section V, “Water Connections”.

3. Install a pressure relief valve on a tee connection from the hot water outlet piping from the water heater. Refer to the piping diagrams (fig. 1-4) and pressure relief valve warning in Section V, “Water Connections”.

4. In cold climates where piping can freeze during an extended power failure, drain solenoid valves should be installed on the cold and hot water supply lines to allow water to drain from the water heater when power is interrupted. Refer to the piping diagram (fig. 3) “Recommended Piping for Power Failure Freeze Protection” in Section V and contact your Bradford White dealer if assistance is needed.

5. If this water heater is installed in a closed water supply system, such as the one having a backflow preventer in the cold water supply, provisions must be made to control thermal expansion. DO NOT operate this water heater in a closed system without provisions for controlling thermal expansion. Warranties do not cover damages from thermal expansions such as pressure bulges and/or deformities. Your water supplier or local plumbing inspector should be contacted on how to control this situation.

6. Purge the cold water line prior to connecting to the water heater to remove debris. Debris will clog the mesh strainer of the inlet filter. The inlet strainer prevents debris from damaging the flow sensor or clogging the coil. It may need to be cleaned periodically and should be cleaned after the initial operation. DO NOT operate the water heater without the filter in place.

7. After installation of the water lines, open the main water supply valve and fill the water heater. While the water heater is filling, open several hot water faucets to allow air to escape from the water system. When a steady stream of water flows through the faucets, close them and check all water connections for possible leaks.

8. This water heater may also be connected to a circulating pump or storage tank for increased flow capacity during high demand periods. Refer to the suggested piping diagrams (fig. 2 & 4) in Section V to be used as a guide.

9. Commercial installations may require more than one water heater piped together in a manifold to supply enough capacity for high temperature and high water flow applications. Special controls are available from your Bradford White supplier for operating more than one water heater together. These controls stage the operation of the water heaters for the flow rates and control the amount of flow through each water heater. Order part# 239-44511-00 for the electronic manifold control for the first and second water heater and part# 239-44512-00 for the wiring harness for each additional water heater to be controlled. Instructions are included with these parts. Use the piping diagram in figure 4 in Section V as a guide.

NOTICE

Take care when using pipe dope or Teflon tape to avoid clogging the inlet screen and water flow sensor. Wipe off excess pipe dope from threads before connecting to the water heater.

Commercial dishwashers will require either more than one water heater, or a storage tank to supply a sufficient volume of hot water.

Recommended Piping for a Basic Installation (Fig. 1)

Recommended Piping for a Circulation System (Fig. 2)

Recommended Piping for Power Failure Freeze Protection

As long as electrical power and gas are supplied to the EVERHOT® water heater, freeze protection is provided to the heat exchanger and piping inside the water heater with ambient temperatures as cold as

-30°F (-34°C), when protected from direct wind exposure. In the event of a power failure with ambient temperatures below freezing, the water heater must be drained of all water to prevent freeze damage. The water heater may be drained manually, or automatically, through the installation of the optional solenoid valves as shown in the following illustration. The drain solenoids are recommended for very cold climates to prevent water heater freeze damage where power failures from ice and windstorms occur.

The electrical connections for the two solenoids must be tied to the 120 volt main power supply (black and white wires). When the electrical power to the water heater fails, the ¾” solenoid on the cold water inlet pipe closes, stopping water flow into the water heater. The ¼” solenoid opens, allowing the water heater and connected piping to drain. Make sure the piping from the drain solenoid is run to a suitable drain or outside the building to prevent water damage.

Drain Solenoid Piping (Fig. 3)

Recommended Piping for Back-up Storage System

For hotels, motels, and other high flow applications (Fig. 4)

Note: The Primary Circulator for the water heating loop must be sized for 21 GPM @ 35 Ft. Head

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