Espa C2-Lite CAD series, Инструкция по установке и эксплуатации

Страница: 4 / 11

www.espa-pumps.co.uk
EN
Tank
Fig. 1.4-4 Booster Pump w/ Horizontal Tank
Pressure Switch
Pressure Gauge
Flexible
Connector
Pump
Fig. 1.4-5 Booster Pump w/ Inline Tank
Pressure
Switch
Pressure Gauge
Tank
Pump
Transducer
Pressure Gauge
Water Flow
Tank
Pump
Fig. 1.4-6 Booster Pump w/ Tank
1.5 Multiple Tank Installation
All tanks must have the same precharge for the system to function
properly. Tanks should be installed on a header to ensure all tanks
receive equal and balanced pressure. Adjust each tank precharge
as detailed in section 1.3. The system pressure switch or control
should be centrally located (see Fig 1.5) in order for the tanks to
function properly.
Fig. 1.5 Multi-tank Installation
equal precharge
Relief
Valve
Pressure
Switch
Header to be sized
for maximum velocity of
1.8m/sec (6ft/sec)
Water F
low
1.6 Pump Run Control Operating Principles
Without a pressure tank, a water system’s pump would cycle
(turn on) every time there was a demand for water. This frequent
and potentially short cycling would shorten the life of the pump.
Pressure tanks are designed to store water when the pump is
running and then deliver pressurized water back to the system
when the pump is shut off (Fig 1.6). A properly sized tank will
store at least one liter of water for every liter per minute (LPM) of
pump capacity. This allows for fewer pump starts and longer run
times which should maximize the life of the pump.
1. Before drawdown 2. During
drawdown
3. Pump comes on
the tank
Fig. 1.6
GWS recommends that defective plain steel tanks are replaced
with GWS tanks. It is strongly recommended that a relief valve is
installed at the GWS tank connection. Also be sure to plug the
air port on a jet pump, as air is no longer required to be supplied
to the tank.
2. Thermal Expansion Tank Installation
Thermal expansion tanks are designed to accommodate the
natural expansion of water as it is heated. Thermal expansion
tanks may be used in several different applications including
closed loop hydronic heating systems, direct and indirect solar
heating systems, and open loop potable water heating systems.
GWS has developed three different series of tanks to be used for
systems, SolarWave™ for indirect closed loop solar heating
systems, and ThermoWave™ for direct solar heating and open
loop potable water heating systems. For high volume thermal
expansion applications Challenger™ and SuperFlow™ Series
tanks may be used.
CAUTION: Check tank data label for maximum operating
pressure and temperature prior to installing.