Application Guide

Single-Zone Heating and Cooling Applications 12 CTE-5202 Applications Guide, AN0912A Rev. H
Heating, RA and DA
~
T T
AI1
AO1 AO2
CTE-5202
Thermostat
24 VAC
~
–
(Phase)
(Neutral)
(5K–10K Ohm
Resistor between
AI1 and Common
for RA Mode Only)
24 VAC
Common
Input
Valve
Select Sequence 1
Select Sequence 1 Select Sequence 1
AND Set Changeover to 55° F
CTE-5202 thermostats can use a variety of valves for
heating/cooling applications with hot and chilled
water. For Reverse Acting control, connect a 5K to
10K ohm resistor between Common and AI1. Select
Sequence 1 (from the CTE-5202 SYSTEM menu)
and lower the Changeover (in the ADVANCE
menu) to the lowest seing (55° F). See Change
Conguration on page 6. The resistor simulates a
changeover sensor and puts the thermostat in Re-
verse Acting mode.
NOTE: If the resistor value is too high, the
thermostat will not go into RA mode. If
the resistor value is too low, the thermostat
may go into setback mode.
This RA control works for NO 2–10 and 0–10 VDC
valves or NC 10–2 and 10–0 VDC valves as well as
equivalent SCR controls.
For Direct Acting control, select Sequence 1 (from
the CTE-5202 SYSTEM menu). See Change Con-
guration on page 6. (Do not connect the resistor.)
This DA control works for NC 2–10 and 0–10 VDC
valves or NO 10–2 and 10–0 VDC valves as well as
equivalent SCR controls.
RA Heating
Heating
Valve Open
Setpoint
(Colder Room Temperature Warmer)
Setpoint
(Colder Room Temperature Warmer)
AO1
Signal
DA Heating
AO1
Signal
Heating
Valve Open
Heating
Valve Closed
Heating
Valve Closed
10 VDC
10 VDC