911-481 Rev. F 10/04
Page: 1 of 2
3400 SERIES ACCUMULATOR TANK
GENNERAL INSTALLATION INSTRUCTIONS
This manual does not address water boost applications. For help, please contact SHURflo.
Read this manual carefully. Failure to follow instructions could cause serious bodily injury and/or property
damage.
Do not exceed 100 psi [6.8 bar] on the 3400 series.
WARNING:
Hazardous pressure. To prevent possible serious or fatal injury and/or damage to equipment,
system pressure
MUST BE LESS THAN 100
pounds per square inch (psi) [6.8 bar] under any
circumstances. Failure to follow instruction can result in tank blowup. If system discharge pressure can
exceed 100 psi [6.8 bar], install a relief valve capable of passing the full pump volume at 100 psi [6.8
bar]. Install relief valve in pump supply line to tank, as close to tank as possible. Consult installer or
licensed plumber for correct relief valve. Install system according to local codes.
The SHURflo Accumulator tank is a bag-type pressure storage vessel and/or a pulsation dampening device.
The accumulator is precharged to 20 psi [1.4 bar] for shipping. Do not exceed this pressure for long-term
storage, shipping or system non-use.
An accumulator placed in the pressurized side of a potable water or reverse osmosis system (with a
demand pump), can minimize pump cycling. The accumulator contributes to longer pump life, less noise,
less amperage draw, and reduced water pulsation. The most efficient use of the accumulator occurs with
the precharge pressure set at the SAME pressure as the pumps' pressure switch "turn
ON
" setting.
Typically, a 40 psi [2.7 bar] pump will "turn
ON
" at 20 psi [1.4 bar]. Therefore, the precharge should also be
20 psi [1.4 bar]. The precharge must be set in a "static" condition (pump off and at least one water fixture
opened to atmosphere).
NOTE:
If the accumulator precharge exceeds the pump "turn
ON
" pressure by "a couple of psi," the
volume of pressurized liquid within the accumulator will be reduced.
•
The precharge valve stem cap
MUST
be tight to prevent a leak down of pressure. It is recommended the
precharge be checked on a monthly basis.
•
The accumulator may be mounted anywhere in the pressurized cold water side of the plumbing. The port
is non-directional in flow, allowing mounting in any position.
•
CAUTION:
Do not freeze or mount near a high heat source. Extreme temperatures may lead to tank
explosion and serious injury.
GENERAL INFORMATION
•
Keep safety labels in good condition. Replace missing or damaged safety labels.
•
When servicing tank, BE SURE the pump (power source) is disconnected. Release all water pressure before
working on tank or system. Release all precharge pressure by depressing the valve core.
•
In areas where temperature is high for long periods of time, tank precharge may increase. This may
reduce tank drawdown (amount of stored water at pressure). If this occurs, reduce precharge pressure 2
psi [14kPa] below pump "turn
ON
" pressure. Cold temperatures may require more air pressure.
TO CHECK TANK AIR CHARGE
If drawdown decreases significantly, check as follows:
1.
Shut off electric power to pump, open faucet near tank, and drain completely.
2.
At air valve, check precharge with tire gauge. Precharge should be at pump "turn
ON
" pressure setting.
3.
If precharge is more than 2 psi [14kPa] below the "turn
ON
" pressure, add air to tank. Use air compressor or
portable air storage tank. If precharge is above "turn
ON
" pressure, bleed off the appropriate amount.
4.
Use soap or liquid detergent to check for air leaks around air valve. Continuous bubbling indicates leak.
If necessary, install new core in air valve (same as used for automobile tires).
5.
If tank is filled with water (waterlogged), the bladder is leaking. Replace bladder.
