68
CVHE-SVX005C-EN
Water Pump Interlock Circuits
and Flow Switch Input
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Verify that no power is
present with a voltmeter.
Note: The circuits for the chilled water proof of flow and the
condenser water proof of flow do NOT require
external power. Refer to the wiring diagrams that
shipped with the chiller.
Chilled Water Pump
1. Wire the evaporator water pump contactor (5K1) to a
separate 120 volt single-phase power supply with
14 AWG, 600V copper wire.
2. Connect circuit to 1A5-J2-6.
3. Use 1A5-J2-4 120 Vac output to allow the control panel
to control the evaporator water pump, or wire the 5K1
contactor to operate remotely and independently of the
control panel.
Chilled Water Proof of Flow
When this circuit is installed properly and the evaporator
pump is running and providing the required minimum flow,
this circuit will prove the evaporator water flow for the
chiller controls. Proof of evaporator water flow is required
before the start sequence will be allowed to proceed and a
loss of evaporator water flow during chiller operation will
result in a chiller shutdown.
Refer to as-built schematics on the inside of the control
panel for field wiring. This is a dry binary input; normally-
open, closure for flow. Apply no external power.
1. With factory-installed ifm efector
®
flow-sensing
devices, a field-provided secondary flow-sensing
device is recommended with applications having 38°F
(3.3°C) and below leaving evaporator water
temperatures. When a secondary flow-sensing device
is used, remove the factory jumper and install its
contacts between 1X1-5 to 1K26-4; this places the
secondary flow sensing device in series with the ifm
efector
®
flow-sensing device.
2. For field-provided primary proof of flow devices,
connect the primary proof of flow device between
terminals 1X1-5 to 1A6-J3-2. A secondary field device
is recommended with applications having 38°F (3.3°C)
and below leaving evaporator water temperatures, and
must be field-wired in series with the primary proof of
flow device.
Condenser Water Pump
1. Wire the condenser water pump contactor (5K2) to a
separate 120-volt, single-phase power supply with
14 AWG, 600-volt copper wire.
2. Connect circuit to control panel terminals 1A5-J2-3.
3. Use 1A5-J2-1 120 Vac output to allow the control panel
to control the condenser pump.
Condenser Water Proof of Flow
When this circuit is installed properly and the condenser
pump is running and providing the required minimum
condenser water flow, this circuit will prove the condenser
water flow for the chiller controls. Proof of condenser water
flow is also required for the start sequence will be allowed
to proceed and a loss of condenser water flow during chiller
operation will result in a chiller shut-down.
Refer to as-built schematics on the inside of the control
panel for field wiring. This is a dry binary input; normally-
open, closure for flow. Apply no external power.
1. With factory-installed ifm efector® flow-sensing
devices, a secondary field-provided flow-sensing
device is optional. When a secondary flow-sensing
device is used, remove the factory jumper, and install
its contacts between 1X1-6 to 1K27-4; this places the
secondary flow sensing device in series with the
ifm efector® flow-sensing device.
2. For field-provided primary proof of flow devices,
connect the primary proof of flow device between
terminals 1X1-6 to 1A6-J2-2. The secondary field
provided flow sensing device is optional; however,
when it is present, it must be field-wired in series with
the primary proof of flow device.
Heat Recovery Proof of Flow
When this circuit is installed properly and the condenser
pump is running and providing the required minimum
condenser water flow, this circuit will prove the condenser
water flow for the chiller controls. Proof of condenser water
flow is also required for the start sequence will be allowed
to proceed and a loss of condenser water flow during chiller
operation will result in a chiller shut-down.
Refer to as-built schematics on the inside of the control
panel for field wiring. This is a dry binary input; normally-
open, closure for flow. Apply no external power.
1. With factory-installed ifm efector® flow-sensing
devices, a secondary field-provided flow-sensing
device is optional. When a secondary flow-sensing
device is used, remove the factory jumper, and install
its contacts between 1X1-8 to 1K28-4; this places the
secondary flow sensing device in series with the
ifm efector® flow-sensing device.
2. For field-provided primary proof of flow devices,
connect the primary proof of flow device between
terminals 1X1-6 to 1A29-J3-2. The secondary field
provided flow sensing device is optional; however,
when it is present, it must be field-wired in series with
System Control Circuit Wiring (Field Wiring)
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