Watlow 321 User Manual

Series 321

ISO 9001

Dual Output, Digital Countdown Timer

User's Manual

ISO 9001

Registered Company

Controls

1241 Bundy Blvd., P.O. Box 5580, Winona, MN 55987-5580

Phone: [phone], Fax: [phone]

Winona, Minnesota USA

Watlow's Series 321 is a dual output, digital
countdown timer with an easy-to-use control
and display panel. The display allows you to
track remaining time and process status. On­board memory retains the most recent time
setting for easy recall, even after power is
removed. The interlock feature interrupts
timer operation immediately when it is
opened. This feature can be used as an
interlock, remote off, or emergency shut-off.
The housing and connectors are designed for
fast and reliable installation in your product.

Features

• Square 1/8-DIN size;

• Universal mounting scheme — through the

panel or flush mount;

• Standard 1/4" spade wiring terminals;

• Dual output — 6A @ 120V~ (ac) or 3A @

240V~ (ac) mechanical relays;

• Corrosion and water resistant composite case;

• Timer display options include hours:minutes

or minutes:seconds.

Dimensions

Figure 1a – Series 321 Timer and mounting collar, side view.

.750"

(19.1mm)

Front Panel

2.85"

(72.4mm)

Ridges

1.750"

(44.5mm)

2.585"

(65.7mm)

3.325"

(85.46mm)

Tabs

321 Timer Mounting Collar Timer flush with Mounting Collar

Figure 1b – Series 321 Timer inserted
in the mounting collar, side view.

1.750"

(44.5mm)

Front Panel

2.585"

(65.7mm)
Tabs
Ridges

W321-XUMN Rev B Made in the U.S.A

May 1997 (1107) Printed on Recycled Paper

10% Postconsumer Waste

Dimensions Dimensions

Figure 2a – Series 321 Timer inserted
in the mounting collar, bottom view.

321 Timer Front Panel

3.325"

(85.46mm)

Mounting

Collar

1.750"

(44.5mm)

2.585" (65.7mm)

Installation

Through-the-Panel Installation Procedure:

1. Make a panel cutout using the dimensions in
Figure 2c.

2. Remove the timer from its collar and set the
collar aside.

3. Insert the timer into the cutout. Check to see
that the gasket is not twisted and is fully seated
in its channel.

Figure 2b – Series 321 Timer inserted
in the mounting collar, top view.

2.585" (65.7mm)

1.750"

(44.5mm)

Mounting

Collar

3.325"

(85.46mm)

321 Timer Front Panel

4. While pressing the front of the timer against the
panel, slide the mounting collar over the back of
it. The tabs on the collar must line up with the
ridges on the timer for secure installation - see
Figure 1b.

5. The tabs on each side of the collar have teeth
that latch into the ridges of the timer. Be sure
to apply enough pressure to firmly install the
timer.

Figure 2c – Series 321 Through-the-Panel dimensions.

2.585" (65.7mm)

321

2.585"

(65.7mm)

Time Set

Start
Stop

.250" (6.35mm)

Panel

2.585" Square Cut
(65.7mm)

WATLOW Series 321 User's Manual 2