KMC Controls CTE-5202 - Connection and Configuration; Connections; External Input (AI1)

General Information (All Applications) 5 CTE-5202 Applications Guide, AN0912A Rev. D
Connection and Configuration
External Input (AI1)
Hot/Cold Changeover
For hot/cold air changeover on Sequence 1 or 2,
connect a changeover sensor to the AI1 input. The
sensor should be a Type III thermistor (10K ohm
@ 77° F), such as KMC STE-140x duct or STE-
1454/1455 strap-on sensors. (An internal 10K ohm
pullup resistor is provided on AI1.)
See, for example, Cooling with Heating Changeover
on page 26 and Chilled Beam 2-Pipe Heating and
Cooling with Changeover on page 15.
At power-up, the default mode for Sequences 1 and
2 is Cold Air mode with a default changeover set-
point of 77° F. If the AI1 sensor reads a temperature
higher than 79° F, the Hot Air mode becomes active.
Hot Air mode stays active until the AI1 temperature
falls below 75° F. Then Cold Air mode is active until
the AI1 temperature rises above 79° F, which makes
Hot Air mode active. At power-up, if the tempera-
ture is between 75° F and 79° F, the thermostat will
assume Cold Air mode.
For continuous cold air mode, leave the sensor o.
The changeover temperature setpoint is adjustable
between 55 and 85° F in the ADVANCE menu, and
the default is 77° F. See Change Conguration on
page 6.
Unoccupied/Standby Setback
Contact closure across AI1 and Common initiates the
standby setback oset sequence, which causes the
cooling setpoint (in all Sequences) to increase and
the heating setpoint in Sequence 2 or 3 to decrease
by the amount of the setback oset. This setback
does not apply during the morning warm-up se-
quence.
See, for example, Cooling with 3-Stage Reheat and
Night Setback/Setup on page 25 and Cooling with
3-Stage Reheat and Night Setback/Setup on page
36.
Connections
Standard connections to the terminal block are:
• “Heating” output (REE-50xx reheat relay mod-
ules and heating valves) to AO2 and
T
(Com-
mon)
• “Cooling” output (VAV dampers and cooling
valves) to AO1 and
T
(Common)*
• Changeover (temperature) sensor (Type III, 10K
ohm thermistor) and/or standby/unoccupied
setback contact to AI1 and
T
(Common). (See
External Input (AI1) on page 5.)
• 24 VAC transformer’s neutral lead to
T
(Com-
mon) and phase lead to ~. Alternately, 14–35
VDC can be used with + connected to ~ and –
connected to
T
(Common).
*NOTE: AO1 also controls heating in morning
warm-up, changeover, and some other
congurations. For examples, see:
Heating, RA and DA on page 12, Chilled
Beam 2-Pipe Heating and Cooling with
Changeover on page 15, Cooling or
Heating on page 17, Cooling and 3-Stage
Reheat on page 24, Dual Duct, Minimum
Air from Cold Duct on page 31, Cooling
with Heating Changeover on page 37,
Cooling with Morning Warm-Up on page
46, and TP-8101/8102/8103 Replacement
(General) on page 55.
NOTE: For additional information on mounting
and installation, see the CTE-5202
Installation Guide.
~
T
T
AO2
“Heating” Output
AO1
“Cooling” Output
Common
Common
Power (AC Phase or DC +)
Input
AI1