System Control Circuit Wiring (Field Wiring) . Trane CVHE-SVX02M-EN, CVHG, CVHF, CVHE
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System Control Circuit Wiring (Field Wiring)
Table 20.
Unit control panel wiring 120 Vac
Standard Control Circuits: Unit
Control Panel Control Wiring
(120 Vac)
Chilled Water Flow Proving Input (a)
Condenser Water Flow Proving
Input (b)
Chilled Water Pump Relay Output
Condenser Water Pump Relay
Output
Optional Control Circuits (120
Vac)
Alarm Relay MAR (Non-Latching)
Output
Limit Warning Relay Output
1A8-J2-4 to 6
Alarm Relay MMR (Latching) Output
1A8-J2-7 to 9
Compressor Running Relay Output
1A8-J2-10 to 12
Maximum Capacity Relay Output
1A9-J2-1 to 3
Head Relief Request Relay Output
1A9-J2-4 to 6
Purge Alarm Relay Output
Ice Making Relay Output
1A9-J2-7 to 9
1A5-J2-10 to 12
Free Cooling Relay Output
Standard Low Voltage Circuits
(Less than 30 Vac) (c)
1A11-J2-4 to 6
Unit Control Panel Terminations
External Auto Stop Input 1A13-J2-1 to 2
Emergency Stop Input
Unit Control Terminations
1X1-5 to 1A6-J3-2
1X1-6 to 1A6-J2-2
Note:
1A5-J2-4 to 6
1A5-J2-1 to 3
Input or Output Type
Binary Input
Binary Input
Binary Output
Binary Output
Defaults are factory programmed; alternates can be selected at start-up using the service tool.
1A8-J2-1 to 3
1A13-J2-3 to 4
Binary Output
Binary Output
Binary Output
Binary Output
Binary Output
Binary Output
Binary Output
Binary Output
Binary Output
Input or Output Type
Binary Input
Binary Input
Contacts
Normally Open, Closure with Flow
Normally Open, Closure with Flow
Normally Open
Normally Open
Normally Open
Normally Open
Normally Open
Normally Open
Normally Open
Normally Open
Normally Open
Normally Open
Normally Open
Contacts
Closure Required for Normal
Operation
Closure Required for Normal
Operation
Optional Low Voltage Circuits
External Base Loading Enable Input
External Hot Water Control Enable
Input
External Ice Machine Control
Enable Input
External Free Cooling Input Enable
Input
% RLA Compressor Output
External Condenser Pressure
Output
Evaporator/Condenser Differential
Pressure Output
1A18-J2-1 to 2
1A18-J2-3 to 4
1A19-J2-1 to 2
1A20-J2-1 to 2
1A15-J2-1 to 3
1A15-J2-4 to 6
1A15-J2-4 to 6
Binary Input
Binary Input
Binary Input
Binary Input
Analog Output
Analog Output
Analog Output
Condenser Head Pressure Control
External Current Limit Setpoint
Input
External Chilled Water Setpoint
Input
External Base Loading Setpoint
Input
1A15-J2-4 to 6
1A16-J2-2 to 3
1A16-J2-5 to 6
1A17-J2-2 to 3
Analog Output
Analog Input
Analog Input
Analog Input
Generic Refrigerant Monitor Input
1A17-J2-5 to 6
Analog Input
Outdoor Air Temperature Sensor
Tracer® Comm Interface or
LonTalk®
Inter-processor Communication
(IPC) Bus Connection and Sensor
1A14-J2-1(+) to 2(-)
1A14-J2-3(+) to 4(-)
Communication and Sensor
Communication to Tracer® or LonTalk®
BACnet® or MODBUS®
Tracer® SC Module
1A22, 5(+) to 6(-)
1A10
Communication to BACnet® or
MODBUS®
Communication to Tracer® SC
Module
otte
All wiring to be in accordance with National Electrical Code (NEC) and any local codes.
Normally Open
Normally Open
Normally Open
Normally Open
2–10 Vdc
2–10 Vdc
2–10 Vdc
2–10 Vdc
2–10 Vdc, or 4–20 mA
2–10 Vdc, or 4–20 mA
2–10 Vdc, or 4–20 mA
2–10 Vdc, or 4–20 mA
(As Ordered; See Sales Order)
(As Ordered; See Sales Order)
(a) If the Chilled Water Flow Proving Input is a factory-installed ifm efector® flow-sensing device, the secondary field device (recommended with 38°F [3.3°
C] and lower leaving chilled water temperatures) for proof of flow connects from 1X1-5 to 1K26-4 (binary input; normally open, closure with flow).
Remove factory jumper when used.
64 CVHE-SVX02M-EN
Table 20.
Unit control panel wiring 120 Vac (continued)
(b)
(c)
If the Condenser Water Flow Proving Input is a factory-installed ifm efector® flow-sensing device, the secondary (optional) field device for proof of flow connects from 1X1-6 to 1K27-4 (binary input; normally open, closure with flow). Remove factory jumper when used.
Standard low-voltage circuits (less than 30 Vac) must be separated from 120 Vac or higher wiring.
Water Pump Interlock Circuits and Flow Switch Input
n d ea eccttss b effo na ve viicciin g.. F
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 1X1-5 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.
Temperature Sensor Circuits
All temperature sensors are factory installed except the optional outdoor air temperature sensor. This sensor is required for the outdoor air temperature type of chilled water reset. Use the following guidelines to locate and mount the outdoor air temperature sensor. Mount the sensor probe where needed; however, mount the sensor module in the control panel.
CVHE-SVX02M-EN 65
CWR—Outdoor Option
The outdoor temperature sensor is similar to the unitmounted temperature sensors in that it consists of the sensor probe and the module. A four-wire interprocessor communication (IPC) bus is connected to the module for 24 Vdc power and the communications link.
Trane recommends mounting the sensor module within the control panel and the sensor two wire leads be extended and routed to the outdoor temperature sensor probe sensing location. This ensures the fourwire inter-processor control (IPC) bus protection and provides access to the module for configuration at start-up.
The sensor probe lead wire between the sensor probe and the module can be separated by cutting the twowire probe lead leaving equal lengths of wire on each device: the sensor probe and the sensor module.
remain together or inaccuracy may occur.
These wires can then be spliced with two 14 to 18 AWG
600V wires of sufficient length to reach the desired outdoor location with a maximum length 1000 ft
(304.8 m). The module four-wire bus must be connected to the control panel four-wire bus using the
Trane-approved connectors provided.
The sensor will be configured (given its identity and become functional) at start-up when the Trane service technician performs the start-up configuration. It will
NOT be operational until that time.
leads, be sure to cover the shield wire with tape at the junction box and ground it at the control panel. If the added length is run in conduit, do
NOT run them in the same conduit with other circuits carrying 30 or more volts.
low-voltage (less than 30V) and high voltage circuits. Failure to do so could result in electrical noise that may distort the signals carried by the low-voltage wiring, including the IPC.
Optional Control and Output Circuits
Install various optional wiring as required by the owner’s specifications (see
).
Optional Tracer Communication
Interface
This control option allows the control panel to exchange information—such as chiller status and operating set points—with a Tracer® system.
prevent electrical noise interference.
Additional information about the Tracer® communication interface option is published in the
Installation and Operation
manual that ships with the
Tracer® communication interface
Starter Module Configuration
The starter module configuration settings will be checked (and configured for remote starters) during start-up commissioning.
starter checks, it is recommended that the line voltage three-phase power be turned off and secured (locked out), and then that a separate source control power (115 Vac) be utilized to power up the control circuits.
Use the as-built starter schematic to ensure correct fuse and terminals. Verify that the correct fuse is removed and that the control circuit connections are correct; then apply the 115 Vac separate source power to service the controls.
Schematic Wiring Drawings
Please refer to the submittals and drawings that shipped with the unit. Additional wiring drawings for
CenTraVac™ chillers are available from your local
Trane office.
66 CVHE-SVX02M-EN
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