Combo System Basic Principles

Closed/Open Combo System

From the aspect of delivery of domestic hot water and space heating, the Open and Closed systems operate the same. A system becomes closed when a backflow prevention valve or check valve is installed in the cold water piping upstream of the water heater. A backflow prevention valve will prevent the pressure created when water is heated in the water heater, from being relieved into the cold water system.

Therefore, an expansion tank (or equivalent device) may be installed as part of any closed system. The operations of the valve and expansion tank are discussed later in this section of this manual.

Note: Water systems that incorporate a pressure tank (well systems) are normally open systems.

COLD WATER INLET

DOMESTIC HOT WATER

 

 

CHECK

 

 

 

 

VALVE

 

 

 

 

VALVE

 

 

 

SCHEMATIC SYSTEM

(shut off)

(WHEN REQUIRED)

SUPPLY AIR

COOLING COIL

 

 

(OPTIONAL)

 

ANTI-SCALD VALVE

 

 

 

EXPANSION TANK

 

VALVE

 

DIAGRAM

(WHEN REQUIRED)

 

 

 

OR OTHER MEANS

 

(shut off)

 

 

 

 

 

RETURN AIR

(Closed Loop System)

 

VALVE

VALVE

 

 

 

(shut off)

(balancing)

 

 

 

 

CHECK

 

 

 

WATER HEATER

VALVE

 

 

 

 

 

 

 

 

HEATING COIL

 

 

 

 

DRAIN

 

 

 

 

VALVE

 

 

 

 

BLOWER

 

 

SCHEMATIC SYSTEM DIAGRAM (Open System)

Note:

Plumbing components and system configuration may vary from diagram portrayed. Refer to local codes, local bylaws and installation manuals supplied with water heater before starting any installation work.

COLD WATER INLET

DOMESTIC HOT WATER

 

 

VALVE

 

 

 

(shut off)

ANTI-SCALD VALVE

SUPPLY AIR

COOLING COIL

 

 

(OPTIONAL)

 

(WHEN REQUIRED)

 

 

 

 

 

VALVE

 

 

 

(shut off)

 

 

 

 

 

RETURN AIR

 

VALVE

VALVE

 

 

(shut off)

(balancing)

 

 

 

CHECK

 

 

WATER HEATER

VALVE

 

 

 

 

 

 

HEATING COIL

 

 

 

DRAIN

 

 

 

VALVE

 

 

 

BLOWER

 

 

5

 

 

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Lifebreath AH40DHW, AH60DHW, AH40BHW, AH80BHW, AH60BHW Combo System Basic Principles, Closed/Open Combo System

AH60BHW, AH80BHW, AH40BHW, AH40DHW, AH60DHW specifications

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