The Optional Reset Inputs; Night Heat; Induced Voltage On Remote Control Wiring; Night Heat Thermostats - EngA C-TRAC2 Installation, Operation And Maintenance Manual

A
TE 6100 Wires
Violet (not used, sensor)
Blue
Orange
Grey
Red (not used)

The Optional Reset Inputs

May be controlled from room temperature, ambient temperature, voltage, or current input. The BMS
voltage/current, room and ambient temperature resets will reset SPC in both directions.
The resets permit electronically changing the "calculated set-point" if external reset devices are wired
correctly and the appropriate dipswitches are configured correctly. The "calculated or operating discharge
air set-point" is the mathematical addition of the master set point and one optional reset signal.
If an ambient room override set point is used it is wired to the "Z, X, Y", and "V" terminals. This is used on
any override except the BMS control or a VAV system.
The BMS reset does not have a set point on the C-TRAC2.1. It is controlled from the BMS system. Refer to
Section XVII.

Night Heat

In addition the control can be activated for night heat if configured and wired correctly. See below for
details. Night heat operates best on units with return air. Night heat is not as compatible with units designed
to operate as 100% "make-up air" because at night the unit will have to open the outside air dampers and
heat outside air, which is not truly cost effective. If there is a modulating or single stage room thermostat
connected to terminals "X, V, Y, and Z" the night heat function will be activated when terminal "K" is
powered.
The only exception to "discharge air control" is when the C-TRAC2.1 is wired to provide space temperature
control at night (OPTIONAL). During this night time operation the discharge sensor acts as a modulating
high limit and controls discharge air temperature to approximately 110ºF to 140ºF.
XV. INDUCED VOLTAGE ON REMOTE CONTROL WIRING
Following are a number of discharge temperature reset methods. This also applies to remote set points,
sensors, etc. When any of these are ordered at the time the unit is manufactured the control is calibrated at
the factory and this calibration will satisfy most applications unless resistance from long wiring runs or
induced voltage on the remote wiring cause it to be out of calibration. (To check for induced voltages,
disconnect all of the field wiring in question from the C-TRAC2.1 while the unit is operating, and check for AC volts
across each questionable wire and ground.)
XVI. NIGHT HEAT THERMOSTATS
Requires TE 6100-960-room thermostat c/w dipswitch 3 to be "on". When terminal "K" is powered, cooling
functions are disabled (i.e. no economizer or mechanical cooling). The TE 6100-960 set point is then set back
a number of degrees as selected by pot 1 NSB (night setback). Heat is fired and maintained around a point
between 110ºF to 140ºF as the TE 6000-960 discharge air sensor starts to conduct and operate as a
modulating high limit.

Night Setback

Night setback is initiated by energizing terminal K with 24 VAC.
NOTE
:
Use the same 24 VAC power that is used to power the C-TRAC2.1. This terminal
will lock off the mechanical cooling and the economizer when it is activated.
During night setback the room temperature will be lowered by an adjustable amount as set on the C-
IOM-12
C-TRAC2.1 Terminals
(No jumper S-SP)
Page 10
C-TRAC2.1 MANUAL
M
S
U
TE 6000 Sensor
Q
March 1999 R1