Armstrong FLO-RITE-TEMP 665 Instruções de instalação e ajuste - Página 10
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FLO-RITE-TEMP-Accumulation System
For peak load conditions or to avoid large intermittent steam demands
The FLO-RITE-TEMP water heater accumula-
tion system is designed to provide a specified volume
of accumulated hot water for short duration peak
loads or when steam is in short supply and a recovery
time can be tolerated. During periods of low or no
demand, the water in the accumulator tank is heated
to the set point temperature by the FLO-RITE-TEMP
water heater.
An accumulator or large storage tank is installed
in series with the FLO-RITE-TEMP water heater.
Cold water is piped to the inlet of the water heater
and into the bottom of the accumulator tank. Hot
water flows from the FLO-RITE-TEMP directly to
the accumulator tank through a pump that is con-
trolled by an aquastat. When the pump is off the flow
goes to the accumulator via a bypass around the
pump. This would occur when there is hot water
demand and the temperature in the tank is at set
point.
When the system is started the water in the
accumulator tank is cold which causes the aquastat to
turn the pump on. Water flows out of the bottom of
the tank to the inlet of the FLO-RITE-TEMP. The
water continues this cycle until the aquastat in the
tank senses the appropriate temperature. At that time
the pump shuts off and the water is ready for use.
The globe valve on the bottom of the accumulator
tank should be adjusted at full system demand so that
a pressure differential of approximately 8 psi is read
across the FLO-RITE-TEMP.
October 31, 2002 @ 3:15 pm
In operation, hot water is drawn off the top of the
tank at the same time as cold water enters from the
bottom and hot water from the FLO-RITE-TEMP
enters the tank from the side. When the peak load
stops and
the aquastat senses the cooler water in
the tank, the pump starts and the heating process
begins another cycle.
A bypass line from the heater to the hot water
demand is shown and is normally kept closed. When
the accumulator tank requires maintenance this
bypass allows the tank to be isolated, with hot water
beingsupplied by the FLO-RITE-TEMP only.
Advantages of the accumulation system are:
!
Accumulation tank temperatures are restored over
a period of time avoiding large intermittent steam
demands.
!
Providing the FLO-RITE-TEMP's safety features
to the entire system.
!
Providing accurate hot water temperature control.
!
Providing a back up alternative during tank
maintenance.
!
To allow accumulator tanks to be relatively small
in size because hot water demand is supplemented
by the FLO-RITE-TEMP.
Fig. 10-1
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