Honeywell N20 Series Operation manual

CN0B-0341CH33 R04071

N20, N34 SERIES

NON-SPRING RETURN DAMPER ACTUATOR

20/34 Nm (177/300 lb-in) FOR MODULATING CONTROL PRODUCT DATA

GENERAL

These direct-coupled damper actuators provide modulating

control for:

•Air dampers

•VAV units

•Air handlers

•Ventilation flaps

•Louvers, and

•Reliable control for air damper applications with up to

4.6m2/ 50 sq.ft. (20 Nm / 177 lb-in) or 7.8m2/ 85 sq.

ft. (34 Nm / 300 lb-in)(seal- less damper blades; air

friction-dependent)

FEATURES

•New self-centering shaft adapter

•Access cover to facilitate connectivity

•Declutch for manual adjustment

•Mechanical end limits (CN7220 only)

•Field-installable auxiliary switches

•Rotation direction selectable by switch

•Mountable in any orientation (no IP54 if upside down)

•Mechanical position indicator

SPECIFICATIONS

Supplyvoltage 24 Vac ±20%, 50/60 Hz;

24 Vdc -10...+20%

Nominalvoltage 24 Vac, 50/60 Hz; 24 Vdc

All values stated hereinafter apply to operation under

nominal voltage conditions.

Power consumption

CN7220 6VA/6W

CN7234 8VA/6W

Ambient limits

Ambient operating limits -20...+60 ℃(-5...+140 °F)

Ambient storage limits -40...+80 ℃(-40...+175 °F)

Relativehumidity 5...95%, non-condensing

Safety

Protection standard IP54 as per EN 60529

Protection class II as per EN 60730-1

Overvoltage category II

Lifetime

Fullstrokes 60000

Repositions 1.5 million

Mounting

Round damper shaft 10…27 mm (3/8...1-1/16”)

Square damper shaft 10...18 mm (3/8...11/16”)

45° steps

Shaft length min. 22 mm (7/8”)

Controlsignal 0(2)...10 Vdc

0(4)...20 mA

Input impedance 100 kΩ[0...10 V]

500 Ωm [0...20 mA]

Feedback signal

Limits ±1mAat0...10V

Torque rating

CN7220 20Nm(177lb-in)

CN7234 34Nm(300lb-in)

Runtime 95 sec (60 Hz) / 110 sec (50 Hz)

Rotation stroke 95°± 3°

Dimensions see “Dimensions” on page 6

Weight 1.35kg(3lbs.)

Noiserating 40 dB(A) max. at 1 m

N20, N34 SERIES CN7220, CN7234

CN0B-0341CH33 R04072

90 90

MODELS

C– Direct Coupled Actuator

N– Fail Safe Function (Non-Spring Return)

61 – 24V Floating Control

72 – 24V Modulating Control

46 – 230V Floating Control

20 – 20 Nm (177 lb-in)

34 – 34 Nm (300 lb-in)

A– Standard Model

1– No Feedback

2– Voltage Feedback Signal

0– No Internal Auxiliary Switches

2– Two Internal Auxiliary Switches

XX – System Controlled Numbers

CN72 20 A20XX

Fig. 1. Product Identification System

Model # Description

CN7220A2007 20Nm,24Vac/Vdc, Modulating control, Non-Spring return, Voltage Feedback Signal

and without aux. Switch

CN7234A2008 34Nm,24Vac/Vdc, Modulating control, Non-Spring return, Voltage Feedback Signal

and without aux. Switch

OPERATION/FUNCTIONS

Legend for Fig. 2:

1. Self-centering shaft adapter

2. Retainer clip

3. Rotational angle scales (0...90° / 90...0°)

4. Mechanical end limits (20 Nm [177 lb-in] models, only)

5. Declutch button

6. Anti-rotation bracket

7. Rotation direction switch

8. Access cover

Contents of Package

The delivery package includes the actuator itself, parts 1 through 8 (see Fig.2),

the anti-rotation bracket screws, and the SM mounting plate and screws.

Modulating Control

The actuator is capable of being operated by several controllers providing Vdc

or mA output.

Rotary Movement

The control signal and the corresponding rotation direction (clockwise or

counterclockwise) can be selected using the rotation direction switch (see part

7 in Fig. 2), thus eliminating the need to re-wire. To ensure tight closing of the

dampers, the actuator has a total rotation stroke of 95°.

As soon as operating power is applied, the actuator may start to run. When power is removed, the actuator remains in position. For

actuator-controller wiring instructions, see section “Wiring” on page 5.

ORDERING INFORMATION

When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the TRADELINE®

Catalog or price sheets for complete ordering number.

If you have additional questions, need further information, or would like to comment on our products or services, please write or phone

your local Honeywell Automation and Control Products Sales Office or Honeywell Customer Care.

Fig. 2. Setting units and control elements

N20, N34 SERIES CN7220, CN7234

CN0B-0341CH33 R04073

90 90

Rotation Direction Switch

Fig.3.RotationDirectionSwitch

feedback/control signal when

actuator is

rotation direction

switch position totally totally

Y=2 /2...10V U = 2 V U = 10 V

Y=0 /0...10V* U = 0 V U = 10 V

Y=0 /10...0V U = 10 V U = 0 V

Y=2 /10...2V U = 10 V U = 2 V

* Default shipping position.

Table 1. Feedback/control signal values

Feedback Signal and Manual Adjustment

If, while the actuator is not rotating, the user declutches it and

manually repositions the shaft adapter, the feedback signal

will then follow the new position at which the shaft adapter

has been left.

Power Off/On Behavior

In case the power to the actuator fails, after re-applying

power, the actuator acknowledges its present position and

follows the signal from the controller. This makes it

unnecessary for the actuator to employ autoadaption in order

to re-map the control signal settings.

Dip Switches

The actuators are equipped with two dip switches accessible

after removing the access cover (see Fig. 4).

Fig. 4. Dip switches (view with PCB at bottom)

Autoadapt Dip Switch for Normal Operation

In its default shipping position, the autoadapt dip switch for normal

operation is set to ON as shown in Fig. 4. Dip switches (view with

PCB at bottom)4. If it is set to OFF, no autoadapting is performed,

and the control signal map remains constant.

The autoadapt functionality does not have to be triggered. Rather,

the SmartAct actuator does this automatically when the min. and

max. control signals are provided (see Fig. 5); the feedback signal

is likewise autoadapted.

Fig.5.Actuatorpositioningcurve

Adjusting the Actuator for Autoadapt

In order to make use of the autoadapt functionality, proceed as

follows:

1. Set the autoadapt dip switch to the ON position.

2. If necessary, limit the stroke to the desired range using the

mechanical end limits.

3. Drive the actuator to the left end limit (totally counterclockwise)

by setting the control signal as specified in Table 1.

4. Drive the actuator to the right end limit (totally clockwise) by

setting the control signal as specified in Table 1. The stroke has

now been limited to 0...100% of the control signal range.

Voltage/Current Control Signal Selection Dip Switch

In its default shipping position, the voltage/current control signal dip

switch (see Fig. 4) is set to OFF (= voltage control).

as shown in Fig. 4. Setting it to ON results in current control.

Position Indication

The hub adapter indicates the rotation angle position by means of

the rotational angle scales (0...90° / 90...0°).

Fig.6.Positionindication

voltage/current control signal

dip switch ( )

OFF

autoadapt dip switch for

normal operation ( )

N20, N34 SERIES CN7220, CN7234

CN0B-0341CH33 R04074

Manual Adjustment

IMPORTANT

In order to prevent equipment damage, you must

remove power before manual adjustment.

After removing power, the gear train can be disengaged using

the declutch button, permitting the actuator shaft to be manually

rotated to any position. The feedback signal will then follow the

new position.

Limitation of Rotation Stroke

Two mechanical end limits (adjustable in 3° increments) are

provided (20 Nm [177 lb-in] models, only) to limit the angle of

rotation as desired (see Fig. 7).

Fig. 7. Mechanical end limits

The mechanical end limits must be securely fastened in place

as shown in Fig. 8. Specifically, it is important that they

properly mesh with the rotational angle scales when the

screws are tightened.

Fig.8. Correct / incorrect tightening of end limits

Override

If terminal 3 of the terminal strip (see section “Wiring Diagrams”

on page 5) is unplugged, the stroke will be 0%; reversing the

rotation direction using the rotation direction switch will result in

a max. stroke of 100%. If terminal 3 is jumped with terminal 1

(24 V), the stroke will be 50%.

INSTALLATION

These actuators are designed for single-point mounting.

IMPORTANT

In order to prevent equipment damage, you must

remove power or set the rotation direction switch to

the “Service/Off” position before manual operation.

Mounting Instructions

All information and steps are included in the Installation

Instructions supplied with the actuator.

Mounting Position

The actuators can be mounted in any position (no IP54 or NEMA2 if

mounted upside down; see Fig. 9). Choose an orientation permitting

easy access to the actuator's cables and controls.

Fig. 9. Mounting for IP54

Mounting Bracket and Screws

If the actuator is to be mounted directly on a damper shaft, use the

mounting bracket and screws included in the delivery package.

Self-Centering Shaft Adapter

The self-centering shaft adapter can be used for shafts having

various diameters (10...27 mm [3/8...1-1/16”]) and shapes (square or

round)

In the case of short shafts, the shaft adapter may be reversed and

mounted on the duct side.

Stroke Limitation with Mechanical End Limits

The mechanical end limits (20 Nm [177 lb-in] models, only) enable

the stroke to be limited from 0...90° in increments of 3°.

IP54 IP54IP54 IP54

N20, N34 SERIES CN7220, CN7234

CN0B-0341CH33 R04075

Wiring

Access cover

To facilitate wiring the actuator to the controller, the access

cover can be detached from the actuator.

IMPORTANT

Remove power before detaching the access cover.

Once the access cover has been removed, please

take care to avoid damaging any of the parts now

accessible.

Fig.10. Access cover

Depending upon the model, the access cover may have one or

two terminal strips, including a layout with a description for

each of the terminals.

Fig. 11. Actuator with access cover removed

Wiring Diagrams

CN7220/CN7234

Optional Accessories

The following optional accessories can be ordered separately.

Auxiliary Switch Kit

Order no.: SW2

Connecting

cable terminal name

1~ 24 Vac∼/ 24 Vdc+

2⊥24 Vac⊥/ 24 Vdc-

3Y 0(2)...10 Vdc / 0(4)...20 mA

control signal

supply and

signal lines

5U 0(2)...10 V feedback signal

TERMINAL STRIP 1

0(2)...10 Vdc

0(4)...20 mA

0(2)...10 Vdc

MODULATING CONTROL

Connect via safety

isolating transformer!

24 Vac 24 Vdc

BS4

S6 C

N20, N34 SERIES CN7220, CN7234

CN0B-0341CH33 R04076

Printed in China. on recycled

paper containing at least 10%

post-consumer paper fibers.

Dimensions

Automation and Control Solutions

Honeywell International Inc. Honeywell (Tianjin) Limited

1985 Douglas Drive North 66, BaiHe Road, TEDA

Golden Valley, MN 55422 Tianjin, 300457,P.R.C.

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