~ 7 ~
Fig. 5
+
-
XII. Adjust flow switch
Following the adjustment of the pressure switch,
and with the unit running, close all tapes on the
discharge. If the pump cuts out, no adjustment
is necessary. If the pump does not cut off,
please refer to Fig 6:
1. For TQ200/400/800: Loose the hex. screw and
use a screw driver to adjust the flow switch
clockwise (+) until the pump stops.
2. For TQ1500/2200/3700: Open the control box
and move the flow level control to a higher
position (to allow more flow) until the pump stops.
Open and close a tap on the discharge several
times to ensure that the pump starts and stops
normally. No further adjustments are necessary.
TQ 200/400/800
TQ 1500/2200/3700
Fig. 6
TQ 1500/2200/3700
Open the cover to adjust the pressure
~ 8 ~
XIII. Frequently asked questions:
1. What causes the TQ to start?
The TQ has the built-in pressure switch and
internal flow switch. Each of these can turn the
pump on depending on water consumption.
The pump will start when:
- The pressure is BELOW the pressure switch
activation point. OR
- The flow rate is greater than 0.7 GPM.
The preset activation point for each model is
provided in the pump specifications. The cut in
pressure must be lower than the preset
activation pump; otherwise the pump will not
start.
2. What is the maximum pressure switch
activation point?
Adjust the pressure only when the cut in
pressure is higher than the preset activation
point. Do not adjust the pressure to exceed the
maximum pressure range as below because
too high pressure may cause the pump not
stop:
3. What causes the TQ to stop?
The flow switch is designed to automatically
stop the TQ pump when flow drops to below 0.7
GPM. The pump will shut off in a few seconds
after flow stops (TQ200-800 is programmed to
stop after 8 seconds and TQ1500-3700 is
programmed to stop after 15 seconds). In
addition, the TQ will be turned off in the event of
dry-run or over temperature alarm.
4. What is the purpose of the built-in
pressure tank?
The pressure tank comes from the factory
pressurized at approximately 17-36 psi (with
the pump pressure at zero). It is designed to
minimize motor startup due to small flow
demand or minor leak of the pipeline.
TQ200 - 17 psi (1.2 Kg/cm²)
TQ400 - 26 psi (1.8 Kg/cm²)
TQ800 - 36 psi (2.5 Kg/cm²)
TQ1500 up to 3700 - 36 psi(2.5 Kg/cm²)
5. How is the dry-run condition determined
and the protection provided?
The dry-run is defined when the motor is
running AND the flow rate is less than 0.3 GPM
AND when pressure is less than the pressure
switch setting. The protection is provided:
When the pump is run dry 2 minutes, it will
automatically shut off for 10 minutes and then
attempts to restart. When all 3 attempts are
failed, the pump will rest for 1 hour and then
attempts to restart. This protection mode will
be repeated until the water supply is back to
normal.
In case the pump is cycling (on-and-off
repeatedly) due to small flow (less than
0.3GPM), air pocket in the system, air loss in
the pressure tank or leak in the pipeline, the
protection is provided:
The pump will run for 8 seconds and stop for
about 3 seconds. When the cycling mode
repeat for 15 times consecutively, the pump will
be rest for 1 hour. Then it will start over the
protection mode until the problem is corrected.
Note: Above unusual pump shutdown, users
may remove power plug over than 6 seconds and
reconnect again to restart, if it is necessary.
Warning
The pump is not designed for continuous
operation under low discharge flows such
as slow closing float valves, slow running
taps. Under this application, please install
an extra tank of adequate volume to avoid
“cycling”. (Fig7)
Please set the extra pressure tank prussure
the same as activation pressure. Leaking
discharge line and leaking taps will damage
the unit through causing the pump to
repeatedly start and stop.
Extra Pressure Tank
pipe tee
TQ200 - 31 psi
TQ400 - 40 psi
TQ800 - 67 psi
TQ1500 - 58 psi
TQ2200 - 60 psi
TQ3700 - 72 psi
Fig7
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