KMC Controls MEP-5233 - Manual

Installation Guide
Direct-Coupled Replacement Damper Actuators
for Residential Zone Dampers
Mounting
The MEP-5223 and MEP-5233 are replacement damper actuators designed for residential zone dampers. The
MEP-5223 replaces series B and C actuators on round dampers with a fully closed blade angle of 45 degrees. The
MEP-5233 replaces series B and C actuators on rectangular dampers with a fully closed blade angle of 90
degrees. The series B and C dampers use crank-arms to turn the damper shafts. The MEP units employ a direct-
drive gear and mounting hub assembly to turn the damper shaft, eliminating the need for crankarm assemblies.
CAUTION: Operation problems will occur if the wrong actuator is applied to the wrong style damper. Use
the MEP-5223 actuator ONLY on round dampers and the MEP-5233 actuator ONLY on rectangular dampers.
1. Turn power off.
2. Disconnect 24 VAC wiring to damper actuator.
3. Remove the old actuator or actuator assembly from the damper shaft and damper.
NOTE: After the actuator assembly is removed the damper shaft and blade should move freely. If the unit
sticks or binds, repairs should be made before installing the new actuator.
MEP–5223 and MEP-5233
4. Using a marker place a line on the end of the
damper shaft to indicate the damper blade
position.
5. Slide the new actuator unit directly on to the
standard 1/2" diameter damper shaft.
6. Use the non-rotation bracket (provided) and 2
screws, to align the bottom of the actuator to
the mounting plate. Most replacements will
require 2 new holes to secure the bracket to
the mounting plate.
7. Using the gear disengagement button, rotate
the mounting hub counter clockwise to the fully
open position.
10. Turn the shaft to ensure that the damper blade
is in the fully open position.
11. Using a 5/32" hex/key wrench, firmly tighten
the set screw to secure the damper shaft and the
mounting hub.