KI-OM-0591 Rev 3
7
Introduction
Run Light (Green)
Motor On
L2
Remote indication that the pump motor contactor is
operational and power is supplied to heater switches. Wired
to the normally open contact of the start switch S2NO and
the auxiliary C1/1 of the motor contactor C1.
Run Light (Green)
Heater Bank On
L3-L7
Lamp indication of heater bank power on.
Fault Light (Red)
Pump Overload
L8
Lamp indicating pump fault/overload trip. Wired to contact
R5/1 of relay R5.
Fault Light (Red)
Over Temperature
L9
Lamp indication of system over temperature fault wired to the
relay contact R1/2 of relay R1.
Fault Light (Red)
Low Level
L10
Lamp indicating low water level fault. This fault is linked to
the contact R2/2 of the low level relay R2.
Power On (White)
Indication
L11
Lamp indicating 24 VDC power to control circuit form the 24V
power supply.
Fuse
Transformer Supply
F1 & F2
Fuses for short circuit protection or overload of the supply to
the power supply unit.
Fuse
Control Circuit
F3 & F4
Fuse for short circuit protection or overload of the supply
from the power supply unit to the control circuit.
Pump Overload
O/L1
This overload trips if the pump draws excessive current. The
normally open contact of the overload supplies the pump run
indication. The normally closed contact of the overload is
used in the safety circuit.
Fault Relay
Over Temperature
R1
Fault relay de-energizes during fault when the over
temperature relay R3 or the thermostat contacts are open.
The over temperature relay is interlocked with its normally
open R1/3 contact.
Fault Relay
Low Water Level
R2
The fault relay de-energizes during fault when the normally
closed contact on the float level de-bounce timer is open.
The timer is triggered by the normally closed contact of the
float switch. This arrangement is used to reduce nuisance
faults attributed to level switch vibration or bouncing.
The normally open contact R2/1 is used in the safety circuit
to remove power from the pump and heaters during fault.
The normally open contact R2/3 is used to interlock the relay.
To reset the fault circuit, the fault reset push button must be
pressed.
Fault Relay
(controller)
Over Temperature
R3
This relay is activated by the controller output. The normally
closed contact R3/1 of the relay is used in the over-
temperature relay R1 circuit.
Component
Component ID Function Description
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