XIII. Frequently asked questions:
1. What causes the TQCN to start?
The TQCN 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 3.0-3.5 lpm.
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:
TQCN200 - 2.2 kg/cm
² (31 psi)
TQCN400 - 3.0 kg/cm
² (43 psi)
TQCN800 - 3.5 kg/cm
² (50 psi)
TQCN1500 - 3.2 kg/cm
² (46 psi)
TQCN2200 - 3.4 kg/cm
² (48 psi)
3. What causes the TQCN to stop?
The flow switch is designed to automatically
stop the TQCN pump when flow drops to
below 3.0-3.5 lpm. The pump will shut off in a
few seconds after flow stops (TQCN200-800 is
programmed to stop after 8 seconds) or
(TQCN1500-2200 is programmed to stop after
15 seconds). In addition, the TQCN 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 1.0 - 2.0 kg/cm²
(with the pump pressure at zero). It is designed
to minimize motor startup due to small flow
demand or minor leak of the pipeline.
TQCN200: 0.8 Kg/cm² (11 psi)
TQCN400: 1.0 Kg/cm² (14 psi)
TQCN800: 1.0 Kg/cm² (14 psi)
TQCN1500 up to TQCN2200: 1.2 Kg/cm² (17 psi)
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 1.1 LPM
AND when pressure is less than the pressure
switch setting. The protection is provided:
*To avoid dry run without liquids over 2 minutes,
the pump will automatically rest for 10 minutes
and restart again, if above cycling happen
accumulate 3 times, the rest time will become 1
hour and restart 1 hour again.
*When pressure tank lose air or pipe suck in air
even flow rate less than 1.1L/min, the Pump will
pumping 8 seconds and rest 3 seconds, if above
cycling happen accumulate 15 times, the pump
will rest 1 hour and restart again.
Note:
Above unusual pump shutdown, users
may remove power plug over than 6 seconds and
reconnect again to restart, if it is necessary.
~ 7 ~
Summary of Contents for TQCN1500
Page 11: ...10...
