Lifebreath CAF-02-MB Bedienungsanleitung PDF herunterladen (Seite 9)

Expansion Tanks

Expansion tanks are required for “Closed

Systems”(most municipal water systems are

closed systems). The expansion tank has an air

bladder, which will contract to relieve pressure in

the system. Pressure is created in the closed

system when water is heated in the water heater.

Expansion tanks should always be connected to

the cold water piping between the water heater

shut off valve and the cold water inlet to the

water heater. Follow manufacturers instructions

for sizing and installation.

Anti-Scald Valve

An anti-scald valve is required when the water

heater thermostat is set above 140˚F (60˚C). Also,

an anti-scald valve may be required for all installa-

tions by the “authority

having jurisdiction”. The

valve is placed in the hot water supply

piping from the water heater downstream of the

heating loop connection and upstream of any

domestic hot water connection.

The purpose of the valve is to limit the maximum

temperature available for domestic hot water by

mixing hot water from the water heater with cold

water from the municipal supply.

The Anti-Scald valve must be thermostatically

controlled and approved to the ASSE standard No.

1016 and 1017 for use as an anti-scald device.

Note: There are a number of pressure balancing

valves and mixing valves on the market which are

not certified as a anti-scalding device.

Off Season Circulation Timer

Although the UCG (Unified Canadian Guideline)

does not require these controls, a few building

codes and municipal by-laws do. They are used

to provide periodic circulation of water through

the space heating loop during the summer and

other periods of infrequent use. The concern is

that water which remains stationary in the

heating loop during the summer may be less

than desirable as domestic hot water when it is

returned to the water heater at system startup

in the fall.

Thermostats

There are two thermostats controlling every

combo system, the water heater thermostat

controlling the hot water temperature and the room

thermostat controlling the room air temperature.

cold

water

air cushion

hot

EXPANSION TANKS

Time to Scald

(1st degree burns)

Temperature Time

120˚F 8 min.

130˚F 20 sec.

140˚F 3 sec.

160˚F <1 sec.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 43 44

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