Heating, Ra And Da - KMC Controls CTE-5202 Application Manual

Heating, RA and DA

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 setting (55° F). See
Configuration on page
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.
24 VAC
(Neutral)
(Phase)
10 VDC
Heating
Valve Open
Setpoint
(Colder Room Temperature
Select Sequence 1
Single-Zone Heating and Cooling Applications
Change
6. The resistor simulates a
Valve
–
~
DA Heating
Signal
Heating
Valve Closed
Warmer)
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
figuration on page
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.
CTE-5202
Thermostat
AO1
10 VDC
Heating
Valve Open
(Colder
12
6. (Do not connect the resistor.)
Select Sequence 1
(5K–10K Ohm
Resistor between
AI1 and Common
for RA Mode Only)
RA Heating
Heating
Valve Closed
Setpoint
Room Temperature Warmer)
Select Sequence 1
AND Set Changeover to 55° F
CTE-5202 Applications Guide, AN0912A Rev. D
Change Con-
AO1
Signal