ALT Series Install Instr Datasheet by Littelfuse Inc.

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SUBMERSIBLE PUMP PROTECTOR MODEL ALT-S CONNECTIONS DEVICE 2880 Nonh F‘aza Drive, Rapid Cwly, SD 57702 ym 0mm (800) 8438848 - (805) 8485580 Mutar Pratectlun sanmuls SINCE 1574 www.5ymcom.com
PUMP
#1
PUMP
#2
MAGNETIC
CONTACTOR
#1
MAGNETIC
CONTACTOR
#2
L1 L2
BE SURE POWER IS DISCONNECTED PRIOR TO INSTALLATION!!
FOLLOW NATIONAL, STATE AND LOCAL CODES!
The Model ALT alternating relay is used to
alternate between two loads. It is commonly
used in duplex pumping applications to
balance the runtime of both pumps. The
voltage must be specified in the ALT part
number—Table 1 identifies all available
Model ALTs.
TABLE 1: ALT Model Numbers
MODEL ALT-S
The Model ALT-S has a single-pole, double-throw output relay and is used in
single high-level float applications. When the float switch opens, the alternating
relay changes state forcing the other pump to run the next time the float closes.
CONNECTIONS (MODEL ALT-S)
1. Mount the Model OT08 octal socket in aconvenient location inside the pump control panel.
2. Connect one of the pump's magnetic contactor coils (#1) between socket terminal 2and L1 of the
power supply (see Figure 1).
3. Connect the other pump's magnetic contactor coil (#2) between socket terminal 8and L1.
4. Connect the power supply L1 to socket terminal 3 and L2 to terminal 4.
5. Connect socket terminals 1and 5to one side of the pilot device (pressure switch, float
switch or other isolated contact).
6. Connect the unconnected side of the pilot device to L2.
7. Plug the Model ALT into the socket.
FIGURE 1: Typical Wiring Diagram for the Model ALT-S
ALT-24-S 20–26VAC, SPDT relay
ALT-24-X 20–26VAC, DPDT relay
ALT-24-S-SW 20–26VAC, SPDT relay w/ manual/automatic switch
ALT-24-X-SW 20–26VAC, DPDT relay, w/ manual/automatic switch
ALT-115-S 95–125VAC, SPDT relay
ALT-115-X 95–125VAC, DPDT relay
ALT-115-S-SW 95–125VAC, SPDT relay, w/ manual/automatic switch
ALT-115-X-SW 95–125VAC, DPDT relay, w/ manual/automatic switch
ALT-230-S 195-250VAC, SPDT relay
ALT-230-X 195–250VAC, DPDT relay
ALT-230-S-SW 195–250VAC, SPDT relay, w/ manual/automatic switch
ALT-230-X-SW 195–250VAC, DPDT relay, w/ manual/automatic switch
2880 North Plaza Drive, Rapid City, SD 57702
(800) 843-8848 ·(605) 348-5580
www.symcom.com
INSTALLATION
INSTRUCTIONS
FOR SYMCOM'S
MODEL ALT
14
58
23
76
SUPPLY
PILOT
DEVICE
L2
L1
NC
NO
C14
58
23
76
MAG. COIL
#2
MAG. COIL
#1
PRESSURE SWITCH,
FLOAT SWITCH OR
OTHER ISOLATED
CONTACT
222 Disk Drive, Rapid City, SD 57701
(800) 843-8848 www.symcom.com
MO D EL ALT-X CONNECTIONS 4.5 9.52;?— T_ QQ Q? MANUAL/AUTOMATIC SWITCH
LEAD
LAG
S1
F1
F2
F3
L1
L2
L1
L2
L1
L2
F4
F5
F6
S2
123
4
5
67
8
PUMP
#1
PUMP
#2
MODEL ALT-X
The Model ALT-X has an internal double-pole, double-throw, cross-connected
relay and is used in dual high-level float applications. The pumps alternate as
in the ALT-S version, but the cross-connected relay configuration allows both
pumps to run simultaneously when both the lead and lag floats are closed.
CONNECTIONS (MODEL ALT-X)
1. Mount the Model OT08 octal socket in a convenient location inside the pump control panel.
2. The control circuit should be separately fused to avoid disabling the control circuit when one pump is
disconnected for service.
3. Connect Pump #1’s magnetic contactor coil between socket terminal 8 and L2 of the power supply.
4. Connect Pump #2’s magnetic contactor coil between socket terminal 7 and L2 of the power supply.
5. Connect the LEAD pilot device, S1 (pressure switch, float switch or other isolated contact), between
socket terminals 1 and 3. Each time S1 opens, the relay changes state forcing the other pump to run
the next time the float closes.
6. Connect the LAG pilot device, S2, between socket terminals 2 and 3.
7. Connect L2 of the power supply to socket terminal 6 and L1 to terminal 3.
8. Plug the Model ALT into the socket.
FIGURE 2: Typical Wiring Diagram for the Model ALT-X
MANUAL/AUTOMATIC SWITCH
The ALT is also available with a built-in switch (-SW option) that can be used to manually force one pump to run every
time the float closes. This is useful when a pump has been removed for repair or for test purposes. In the case of the
Model ALT-X-SW, the switch essentially forces one pump to be the lead pump, while still allowing the second pump to
run if both floats are closed.
F1 & F2:
1–2A TYPICAL SIZE
FOR CONTACTOR COILS
MAGNETIC CONTACTORS
F3–F6:
SIZE FOR INDIVIDUAL
PUMP APPLICATION
1 4
58
2 3
7 6
SUPPLY
PILOT
DEVICE
MODEL ALT-X
OPTIONAL
PUMPSAVER® PUMP
PROTECTOR
OPTIONAL
PUMPSAVER® PUMP
PROTECTOR

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