Install Instructions

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INSTALLATION INSTRUCTIONS

69- 1519

Motor Switch Terminal (MSTN)

APPLICATION

The MSTN is a 24 Vac, 6 VA, 50-60-cycle, two-position

motor actuator used with all AOBD, AOBD-BM, and

IOBD automatic opposed blade dampers.

The MSTN is a uni-directional motor that requires single-

pole, double-throw switching to drive the damper open

and closed. It uses a wafer switch to power the

synchronous motor for only 30 seconds while the motor

is moving between open and closed or vice-versa. When

the motor reaches the open or closed position, the

internal switches cut off the power to the motor.

The MSTN has three auxiliary end switches, rated at 1A

at 24 Vac, that can be used to control auxiliary equipment

and one additional damper, when necessary.

The MSTN can be operated by any Trol-A-Temp or

Honeywell zoning panel. It also can be operated by any

spdt switch or relay contact. It can be controlled with five

or three wires, depending on the application.

INSTALLATION

When Installing this Product...

Read these instructions carefully. Failure to follow

them could damage the product or cause a hazard-

ous condition.

Check the ratings given in the instructions and on

the product to make sure the product is suitable for

your application.

Installer must be a trained, experienced service

technician.

After installation is complete, check out product

operation as provided in these instructions.

Planning the Installation

Before installing the motor:

• Check the position of the MSTN.

• Use an ohmmeter and check for continuity between

terminals 2 and 4, and 2 and 6, with no power to the

motor.

When the motor is between the open and closed posi-

tion, place 24 Vac across terminals 1 and 4. Jumper ter-

minals 2 and 5; the motor rotates to the open position

and stops. Install the motor on the damper and set the

damper linkage to open. The crank arm points in toward

the damper when open.

Installing the MSTN

To install the MSTN into the plastic motor box attached to

the motor:

NOTE: When used as replacement motor, remember

that the MSTN is shipped in the open position.

To confirm this for continuity across terminals 2

and 4, there should be none. See Fig.1

Insert the motor shaft into the motor box and

through the hole in the box.

Insert two small screws through the motor box to

hold the motor in place.

Place the motor crank arm on the motor shaft and

tighten the set screws.

WIRING

See Fig. 2-5 for wiring diagrams.

Continuity

Between

Terminals 2 and 4

Continuity

Between

Terminals 2 and 6

Motor

Position

Yes No Closed

No Yes Open

Yes Yes Between

positions

Summary of content (2 pages)

PAGE 1
Motor Switch Terminal (MSTN) INSTALLATION INSTRUCTIONS APPLICATION The MSTN is a 24 Vac, 6 VA, 50-60-cycle, two-position motor actuator used with all AOBD, AOBD-BM, and IOBD automatic opposed blade dampers. The MSTN is a uni-directional motor that requires singlepole, double-throw switching to drive the damper open and closed. It uses a wafer switch to power the synchronous motor for only 30 seconds while the motor is moving between open and closed or vice-versa.
PAGE 2
MOTOR SWITCH TERMINAL (MSTN) PANEL MOTOR TERMINALS 4 5 6 Z 4 5 6 Z Damper Motor 1 2 3 X MOTOR 1 2 3 M6 CLOSED M4 OPEN M1 COMMON 4 5 6 Z Damper Motor 1 2 3 X X DAMPER A M14890 Fig. 1. Motor internal wiring diagram with damper in the open position. DAMPER B NOTE: WHEN TWO DAMPERS ARE NEEDED TO OPERATE FROM ONE ZONE, THEY ARE WIRED IN TANDEM. WHEN OPENING, DAMPER A STARTS OPENING FIRST AND FEEDS POWER TO DAMPER B TO OPEN. WHEN CLOSING, DAMPER B STARTS AND FEEDS POWER TO DAMPER A TO CLOSE.