Supplemental instructions for gas water heaters installed in potable/space heating applications.

Local codes or plumbing authority requirements may vary from the instructions or diagrams provided in this manual and take precedent over these instructions.

Safety Instructions

Hot water

supply to

Combination Potable and Space Heating Application

 

house

Hot water

 

supply to

From HOT

heating

outlet on

unit

water heater

 

Tee fitting for vertical hot water supply lines

Hot water

 

 

 

 

 

 

From HOT

 

 

 

 

 

 

outlet on

supply to

 

 

 

 

 

 

 

 

 

 

water heater

house

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Hot water supply to heating unit

Tee fitting for horizontal hot water supply lines

Tee fitting must be installed as shown. This ensures that any air in the water lines will be purged through the domestic water faucets and showers.

!DANGER: When this system requires water for space heating at elevated temperatures (above 125°F [52°C]), a mixing or tempering valve must be installed in the hot water supply line to the house in order to reduce the scald hazard potential.

!DANGER: Any piping or components used in the installation of this water heater in a combination potable and space heating application must be suitable for use with drinking water.

!DANGER: If this water heater is

installed in an application intended to supply domestic hot water needs and hot water for space heating purposes, do not connect the heater to an existing heating unit or components of a heating system that have previously been used with a non drinking water system.

Toxic chemicals such as those used for boiler treatment may be present and will contaminate the drinking water supply causing possible health risks. Never introduce toxic chemicals, such as those used for boiler treatment, into this system.

Installation Instructions Operating Instructions

Typical Piping Diagram for Combination Potable/Space Heating Installation

Spring loaded check valve in

 

 

 

 

 

heating unit hot water supply line

 

 

 

 

 

and cold water return line (not

 

 

 

 

 

supplied with water heater)

 

 

 

 

 

NOTICE: This check valve is

 

 

 

 

 

incorporated in some heating units.

 

 

 

 

 

Refer to the installation instructions

 

 

 

 

 

supplied with specific heating unit

 

 

 

 

 

to determine if it is required.

 

 

 

 

 

 

H

 

 

 

 

Isolation valve in hot water supply line

OT

 

 

 

 

IL

ER

 

 

to heating unit

F E

 

 

L AV

 

 

 

(not supplied with water heater)

 

 

E

V

C

 

 

 

 

OL

 

 

 

 

D

 

 

 

 

 

See diagrams above for proper pipe application for vertical or horizontal supply lines

Gas line to water heater

Temperature and pressure relief valve

Water heater jacket

Air vent

 

Domestic hot water supply

 

Incoming cold water supply

 

Heat trap

 

6”￿ Min.

Mixing or

 

tempering

Thermal expansion tank

valve (refer

(if required-not supplied

to warning

with water heater)

above)

 

Shut-off valve

Isolation valve in cold water return line from heating unit (not supplied with water heater)

Cold water return line from heating unit

Care and Cleaning Troubleshooting Tips

Temperature and pressure relief valve discharge line

Combustion Air Inlet Openings

Hot water supply line into heating unit

Drain valve (not supplied with water heater)

6” air gap

Heating unit

21

Customer Service

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GE AP13787 Combination Potable and Space Heating Application, Care and Cleaning Troubleshooting Tips

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