Installation Guide
Linear Reset Volume Controllers
CSC-3501, 3505
Mounting
The CSC-3501 and 3505 are position sensitive. They are calibrated to be mounted in a horizontal plane
with the face down. Any other orientation will require recalibration of the “branch balance”.
1. Connect the right angle bracket to the mounting surface with 2 self threading screws in the two 13/64"
(5 mm) mounting holes.
2. Insert the controller, face down.
3. Make sure to leave enough room to make connections.
Connections
For model CSC-3501, 3505 use 1/4" (5 mm) O.D. “FR”
tubing, on the following push-on fittings:
1. Connect the clean, dry, main air supply to Port “M”.
2. Connect the damper actuator to Port “B”.
3. Connect the Thermostat output to Port “T”.
4. Connect the total pressure tap on the air flow sensor
to Port “H”.
5. Connect the static pressure tap on the air flow
sensor to Port “L”.
Adjustments and Calibration
Damper Action
The damper action is factory set at Normally Open (N.O.). To field select Normally Closed (N.C.):
1. Loosen damper selection screw
2. Turn selection dial clockwise until the “NC” arrow aligns with the “Damper” arrow.
3. Tighten selection screw.
To Adjust Branch Balance:
1. Disconnect thermostat from Port “T”
2. Disconnect
∆
P sensor such that “H” and “L” are at 0" WC.
3. Adjust “LO STAT” knob fully Clockwise (CW)
4. Adjust branch balance for midpoint of actuator span +/- 2.5 psig (7.5 psi for 5–10 psi span,
10.5 psi for 8– 13 psi span).
5. Reconnect Ports “H”, “L” and “T”
