Toxalert BSP - Manual (Page 3)

SEQUENCE OF OPERATION (PUMP SEQUENCE):
In circulating pump applications, two circulating pumps are ordinarily used in the water line, a lead or main operating pump
and a standby or backup pump. The “Lead pump” manual selector (S3) is placed in either the “R-1” or “R-2” position for
selection of the lead pump. The green LED indicates a “Flow-Normal” condition whenever either pump P-1 or P-2 is
operating normally. If the lead pump fails to operate the SPDT pressure differential or flow switch (supplied by others)
power the time delay circuit. If the flow is interrupted for more than 30 seconds (adjustable 10 seconds to 4 minutes), the
time delay relay will simultaneously deenergize the lead pump, energize the standby pump, activate the red “LEAD Pump
Failure”LED and trigger the remote alarm circuitry. A set of form C alarm contacts are brought out to the low voltage
terminal strip for remote alarm indication. 24VAC (30VA max.) can be picked up from the terminals “H” and “N” on TB-1
and fed through the alarm contacts to power a remote alarm device(s).
After an alarm indication and after the cause of the interruption has been eliminated, by repairing or replacing the lead pump,
the square red “Reset” button (S2) on the P.C. board, must be depressed to reestablish the selected lead/standby sequence,
turn off the red “lead Pump Failure” LED, and reset the remote alarm contacts. The continuous indication of the green
“Function Normal” LED again indicates lead pump operation.
The “LEAD/LAG” manual selector switch (S3) mounted on the P.C. board can be placed in either the “R-1” or “R-2”
position. In case of lead pump “failure”, the sequence will always index to the standby pump; P-2 or P-1, no matter which
pump is selected as the lead pump. In the event of power failure, the sequence will immediately start the lead pump when
power is restored. If the lead pump has failed, the standby pump will begin operating after the 30 second flow interruption.
SEQUENCE OF OPERATION (BOILER SEQUENCE):
The sequence of operation for the boiler controller is the same as for the pump controller except that the delay time is 6
minutes (standard) rather than 30 seconds for the pump sequence. Also, the proof of operation device, pressure sensor,
thermostat, or other proof of operation device (supplied by others) would be different from the pump flow proving device.
MOUNTING:
The Toxalert Lead/Lag controllers with cabinets may be mounted on the wall and is not position sensitive. The CM –
(customer mounted) controllers can be mounted in any custom control panel and will require approximately 10.5”W x
12.5”H x 3.0” D.
WIRING:
The sequencer is provided with line voltage power supply connections and pump relay connections in the top of the cabinet.
A low voltage, eight station terminal strip is located on the bottom of the P.C. board to connect the outdoor air thermostat, the
SPDT flow (or operations) indication device and optional remote alarm Panel(s). The Pump Sequence panels are assembled
to permit low voltage wiring to enter through the bottom. If the Lead/Lag and/or the ON-OFF-AUTO switches are to be
remotely mounted they can be wired with wire as small as #18 and may be up to 200 feet from its controller. All wiring must
be in accordance with applicable national and local electrical codes.
REMOTE LEAD/LAG OPERATION:
The Lead/Lag function can easily be accomplished by mounting a SPST switch in a remote location. The wiring is 24 VAC
and will require a switch that can switch .5A. Wire the remote switch across terminals H and LL of TB2 mounted in the
upper left corner of the printed circuit board. Cut jumper J-2 to disable the board mounted Lead/Lag switch. When the
remote Lead/Lag switch is in the open position, Relay #1 will control the lead equipment. With the switch closed, relay #2
will control the lead equipment and relay #1 will control its standby equipment.
REMOTE ON-OFF-AUTO:
Remote ON-OFF-AUTO can easily be accomplished by mounting a DPDT switch with ON-OFF-AUTO action, in a remote
location. The wiring is 24 VAC and will require a switch than can switch .5A. Wire the remote ON-OFF-AUTO switch as
described. A spare terminal with the neutral (N) side of 24 VAC is furnished on TB1. Wire (N) terminal to common of
remote switch. The auto side of the remote switch is to be wired to terminal 1 of TB4, and the on side to terminal 2 of TB4.
Cut jumper J1 and J3 to deactivate the PC board AUTO-OFF-ON switch.
TOXALERT INTERNATIONAL, Inc., PO Box 159, Mound, MN. 55364 PHONE: (952) 472-4541 • FAX: (952) 472-4960
www.toxalert.com