Actuator Torque Selection; Heat/Cool/Vav Applications (With The Cte-5202 Thermostat) - KMC Controls MEP-4 Series Application Manual

Actuator Torque Selection

Damper manufacturers should provide information
about the required minimum actuator torque. If
that information is not available, use the following
general guidelines to calculate the required torque.
(Square feet for a rectangular duct can be calculated
Damper Type
Opposed Blades Without Seals
Parallel Blades Without Seals
Opposed Blades With Seals
Parallel Blades With Seals

Heat/Cool/VAV Applications (with the CTE-5202 Thermostat)

Chilled
Beam
4-Pipe
Cooling Valve
Heating
and
Cooling
24 VAC
(Neutral) –
(Phase) ~
Heating Valve
MEP-4xxx Direct-Coupled Actuators (40 to 90 in-lb.)
by multiplying the height and width in inches and
then dividing by 144.)
After minimum torque is known, see the actuator
data sheets to select the appropriate model.
Up to 1000 FPM
3 in-lb. per square foot
4 in-lb. per square foot
5 in-lb. per square foot
7 in-lb. per square foot
MEP-4xxx actuators can be used in single zone pro-
portional heating (baseboard heaters) and cooling
CTE-5202
Thermostat
(chilled beams) with valves or SCR control as well as
pressure-dependent VAV applications. For details of
a variety of sample applications, see the
Applications
(For an example of a fail-safe application on an
outside air damper, see
42/45/49xx) on page
24 VAC @ 5 VA
(Neutral) –
(Phase) ~
4
1000 to 2500 FPM
4.5 in-lb. per square foot
6 in-lb. per square foot
7.5 in-lb. per square foot
10.5 in-lb. per square foot
Guide.
Fail-Safe Direction (MEP-
13.)
Pressure Dependent VAV with
Auto and Override to Fully Closed
NC SPST
Relay
(Override
MEP-4002
to Fully
Actuator
Closed)
2500 to 3000 FPM
6 in-lb. per square foot
8 in-lb. per square foot
10 in-lb. per square foot
14 in-lb. per square foot
CTE-5202
CTE-5202
Thermostat
(5K–10K
Ohm Resistor
between AI1
and Common
for Heating
Mode Only)
Applications Guide, AN0513A Rev. J