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| M.A.H.Y.
Khoory & Co. Trading
> FAQs
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1.1
Models PC44-PC244
and WR45-WR240
have a maximum
working pressure
of 100 psi.
Models
PC266-PC366 and
WR260-WR360 have
a maximum working
pressure of 125
psi.
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1.2
00°
Fahrenheit/93.3°
Celsius.
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1.3
We
recommend not
using over a 50/50
mix. Under no
circumstances
can the product
contain a petroleum
base.
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1.4
No.
The material in
our diaphragm
will not tolerate
petroleum-based
products.
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1.5
Side
installations
are acceptable
up to the WR140
and PC144 sizes.
The underground
tanks manufactured
by Flexcon are
designed for horizontal
installation and
are available
in three sizes
up to WR140BGR.
We do not recommend
horizontal installations
for any tanks
larger than WR140
or PC144.
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1.6
All
Flexcon tanks
carry a 5 year
limited warranty
from the date
of manufacture
on the original
tank.
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1.7
No, unfortunately
there are number
of factors that
can contribute
to a failed tank
and the only factor
that Flexcon can
insure is the
tank.
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1.8
Flush the new
tank by allowing
water to flow
through three
or four pump cycles.
If the taste continues,
you should probably
have the source
water tested.
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1.9
Of course. Flexcon
tanks are designed
in the knowledge
that chlorine
is often used
to periodically
treat a well.
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1.10
A cycle refers
to the pump run
time. A cycle
starts when the
pump starts and
a cycle is completed
when the pump
stops. Pump starts
and stops are
determined by
the pressure settings
of the system.
Below, we demonstrate
a tank’s drawdown
feature that assumes
a water system
with a 30/50-psi
pressure setting.
This means that
the pump will
start (“cut-in”)
whenever the pressure
inside a tank
is reduced to
30 psi and will
stop (“cut-out”)
when the pressure
reaches 50 psi.
Common pressure
settings are 20/40,
30/50 and 40/60.
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1.11
The pressure switch
communicates with
the tank and the
pump. The pressure
switch monitors
the pressure inside
the tank and activates
and de-activates
the pump when
cut-in and cut-out
pressures are
reached inside
the tank.
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1.12
Drawdown refers
to the amount
of water that
evacuates the
tank before the
pressure switch
will activate
the pump. Drawdown
is a affected
by the pump, the
size of the tank
and the pressure
settings that
govern your water
system.
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Picture
1 shows a WR60 tank
with a diaphragm filled
to capacity. At a
30/50-pressure setting,
the diaphragm contains
6.2 gallons and increases
the air pressure inside
the tank to 50 psi,
thus shutting off
the pump.
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Picture
2 shows water withdrawing
from the tank. As
water evacuates, the
air pressure inside
the tank is reduced.
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Picture
3 shows the water
almost totally evacuated
and the pressure in
the tank reduced to
30 psi, thus triggering
the pump to cycle.
The pump will continue
to pump water until
the pressure in the
tank reaches 50 psi.
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1.13
Pre-charge pressure
refers to the
amount of gas
(air is used in
Flexcon tanks)
in psi that is
pumped into a
tank prior to
installation –
usually at the
factory. Most
tanks are provided
with a 28-psi
pre-charge (38
psi in Flexcon’s
two largest sizes).
The pre-charge
is the “spring”
that helps to
create water pressure.
As the diaphragm
fills with water,
it compresses
the pre-charge.
In a 30/50 system,
the pump will
continue to propel
water into the
tank until the
pressure in the
tank reaches 50
psi.
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1.14
Your tanks should
be pressurized
to 2 psi less
than the cut-in
pressure setting
(for example,
if your pressure
settings are 30/50,
then you cut-in
pressure setting
is 30 psi and
your tank should
have a 28 psi
pre-charge).
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1.15
You must completely
drain the tank
to check pre-charge.
To do this, shut
the power off
to the pump and
open (turn-on)
a faucet in the
house. This will
drain the tank
and not allow
it to refill.
On the top of
the tank you will
find an air valve
(similar to the
air valve on your
tires) – use a
tire pressure
gauge to check
the air pressure
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