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CVHE-SVU01E-EN
Control System
Components
External Chilled Water
Setpoint (ECWS)
The External Chilled Water Setpoint
allows the chilled water setpoint to
be changed from a remote location.
The External Chilled Water Setpoint
is found on 1A16 J2-5 to J2-6
(Ground). 2-10 vdc and 4-20 ma
correspond to a 34°F to 65°F (-17.8 to
18.3°C) CWS range. Default 34°F to
65°F, adjustable via service tool.
External Current Limit Setpoint
The External Current Limit is an
option that allows the current limit
setpoint to be changed from a remote
location. The External Limit Setpoint
is found on 1A16 J2-2 to J2-3
(ground), 2-10 vdc and 4-20 ma each
correspond to a 40 to 100 percent
RLA range. UCP limits the maximum
ECLS to 100 percent. Default 40 to
100%, adjustable via service tool.
Note: To use external inputs, the
setpoint source setting on DynaView
must be set to “Ext/FP.”
WPSR (WFC Water Pressure Sensing Option)
1A21 Optional Dual WPSR = WFC Signal #1 Evaporator Differential Not for field use
Analog Input or output Water Pressure
Module
1A21 Optional Dual WPSR = WFC Signal #2 Condenser Differential Not for field use
Analog Input or output Water Pressure
Module
Module Characteristics
1A1, 1A2 Power Supply :
Unit Control Power Supply Module
Converts 27 vac to 24 vdc.
Power Input Voltage: 23VRMS
minimum, 27VRMS Nominal,
30VRMS maximum
Frequency: 50-60 Hz
Current: Full load 27 VAC – 4.30 A
(RMS)
Inrush 27 VAC (RMS) ~ 30A (RMS)
Power Output: Class II Voltage 24
VDC, Rated Current 2.44 Amps.
Fused @ 3 amps. (FUS01513)
1A3, 1A5, 1A10 Dual Relay Output
modules :
Relay #1 J2-1 NO, J2-2 NC, J2-3
common
Relay #2 J2 4 NO, J2-5 NC, J2-6
common
Relay Outputs at 120 VAC: 7.2 Amps
resistive, 2.88 Amps pilot duty, 1/3
HP, 7.2 FLA at 240 VAC: 5 Amps
general purpose, 14 - 26 AWG with a
maximum of two 14 AWG.
Power, 24 +/- 10 percent VDC, 60 mA
maximum, Trane IPC3 protocol. J1-1
+24VDC, J1-2 Ground, J1-3 COMM +
J1-4 COMM -
1A4, 1A6 Dual High Voltage Binary
input module:
Binary Input Signal #1 J2-1 to 2
Binary Input Signal #2 J3-1 to 2
High Voltage Binary Input: Off
Voltage: 0 to 40 VAC RMS , On
Voltage: 70 to 276 VAC RMS
Input is not polarity sensitive (Hot
and neutral can be switched), Input
impedance 130K to 280K ohms
14 - 26 AWG with a maximum of two
14 AWG
Power, 24 +/- 10 percent VDC, 20 mA
maximum. Trane IPC3 protocol. J1-1
+24VDC, J1-2 Ground, J1-3 COMM +,
J1-4 COMM -
1A7 High Power Relay
Relay output contacts at 120 VAC:
16.0 Amps resistive, 6.4 Amps pilot
duty, 1 HP, 16.0 FLA
J2 14-26 AWG with a maximum of
two 14 AWG J2-1 NO, J2-2 NO, J2-3
NC, J2-4 COM, J2-5 COM.
Power, 24 +/- 10% VDC, 60 mA max.
Communications, RS485 Physical
layer, 19.2 Kbaud, Trane IPC3
protocol.
J1: J1-1 +24 VDC, J1-2 GND, J1-3
COMM +, J1-4 COMM -
J11: J11-1 +24 VDC, J11-2 GND, J11-3
COMM +, J11-4 COMM -
The ECWS or ECLS LLID will report
either a very low or very high value
when there is either an open or short
in the system.
When an open or short is detected
(or the signal is severely beyond the
valid range) on the 2-10 VDC or 4-
20mA ECLS input and when the
ECLS option is installed, an
informational diagnostic shall be
generated. The active current limit set
point will default to the panel (or next
priority) current limit set point. Open
and short criteria will be set as close
to the end of the range values as
possible and still reliably detect an
open and short.