Lifebreath CAF-02-MB Uživatelský manuál stáhnout pdf (Strana 5)

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.

5

Combo System Basic Principles

WATER HEATER

DOMESTIC HOT WATER

SUPPLY AIR

BLOWER

HEATING COIL

HRV/ERV CORE

CHECK

VALVE

RETURN AIR

COLD WATER INLET

ANTI-SCALD VALVE

(WHEN REQUIRED)

VALVE

(shut off)

VALVE

(shut off)

VALVE

(shut off)

VALVE

(balancing)

COOLING COIL

(OPTIONAL)

DRAIN

VALVE

EXPANSION TANK

OR OTHER MEANS

(WHEN REQUIRED)

CHECK

VALVE

WATER HEATER

DOMESTIC HOT WATER

SUPPLY AIR

BLOWER

CHECK

VALVE

RETURN AIR

COLD WATER INLET

ANTI-SCALD VALVE

(WHEN REQUIRED)

VALVE

(shut off)

VALVE

(shut off)

VALVE

(shut off)

VALVE

(balancing)

COOLING COIL

(OPTIONAL)

DRAIN

VALVE

HEATING COIL

HRV/ERV CORE

SCHEMATIC SYSTEM

DIAGRAM

(Closed Loop System)

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.

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