Honeywell SP970 Catalog Page

Pneumatic Switches

SP970 Pneumatic Manual or Minimum Position Switches

Used to manually position a remote damper actuator or to reset the

setpoint of a pneumatic controller. They can also provide minimum

damper position by setting a minimum pressure limit in the branch

line to the damper actuator. Replacement kits are available for

Johnson, Powers, Robertshaw, Barber-Colman, and older

Honeywell switches.

• Two spans available as shipped. Six spans with breakaway stops on

knob.

• Pilot bleed and isolated pilot models available.

• Wall or panel mounting.

Dimensions in inches (millimeters)

7/8

(22)

40

60

20

80

100

2-1/4

1-7/8

0

(57)

(48)

1-1/2

2-1/2

(38)

(63)

SP970C 3-7/8 (98)

SP970A 3-1/2 (89)

FRONT VIEW

SIDE VIEW

C4857

Air Connections: Barb fitting for 5/32 in. (4 mm) O.D. plastic tubing

Switch Operation: Used to manually position a remote damper

Airflow Usage: 0.022 scfm (9.8 mL/s)

actuator or reset setpoint of pneumatic controller

Capacity: 0.021 scfm (9.4 mL/s) below minimum position. Above

Switch Type: Three-port pneumatic manual or minimum position switch

minimum position, device feeding pilot determines capacity

Mounting: Panel or Wall

Operating Humidity Range: 5 to 95% RH

Comments: The setpoint knob normally rotates 188 degrees. Two

Temperature Range: 0 F to 140 F (-18 C to +60 C)

breakaway stops on the knob allow rotation of 244 degrees and 300

Maximum Safe Operating Pressure: 30 psi (207 kPa)

degrees.

Output Span

Product Number

(psi)

(kPa)

Includes

SP970A1005/U

10 psi (with 188 degree knob rotation)

69 kPa (with 188 degree knob rotation)

Knob, 0 to 100% scale plate and locknuts

16 psi (with 300 degree knob rotation)

110 kPa (with 300 degree knob rotation)

13 psi (with 244 degree knob rotation)

90 kPa (with 244 degree knob rotation)

SP970A1013/U

5 psi (with 188 degree knob rotation)

34 kPa (with 188 degree knob rotation)

Knob, 0 to 100% scale plate and locknuts

8 psi (with 300 degree knob rotation)

56 kPa (with 300 degree knob rotation)

6.5 psi (with 244 degree knob rotation)

45 kPa (with 244 degree knob rotation)

SP970C1001/U

10 psi (with 188 degree knob rotation)

69 kPa (with 188 degree knob rotation)

Knob, 0 to 100% scale plate and locknuts

16 psi (with 300 degree knob rotation)

110 kPa (with 300 degree knob rotation)

13 psi (with 244 degree knob rotation)

90 kPa (with 244 degree knob rotation)

SP970C1043/U

5 psi (with 188 degree knob rotation)

34 kPa (with 188 degree knob rotation)

Knob, 0 to 100% scale plate and locknuts

8 psi (with 300 degree knob rotation)

56 kPa (with 300 degree knob rotation)

6.5 psi (with 244 degree knob rotation)

45 kPa (with 244 degree knob rotation)

Pneumatic Switch Replacement Parts

Product Number

Description

Used With

14003022-003/U

Final Assembly, manual and minimum position switch, 10 psi span

SP970A

14003199-002/U

Bag assembly with two scale plates, knob assembly and nuts for SP470A

SP470A

176112023

Pneumatic 2-Position Switch

SP470A

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Pneumatic Switches

SP970 Operation

SP970 Typical Piping

							DAMPER
							ACTUATOR
				DAMPER	BRANCH	2
				ACTUATOR
			BRANCH		M	1
				2		4	3
			M	EXH
	DAMPER			1			INSERTION
	ACTUATOR			4	SP970C
							THERMOSTAT
BRANCH		M		SP970A
	2
M	1				M
EXH	4	1	2
	SP970A	CONTROLLER

A. MANUAL POSITION APPLICATION	B. MINIMUM POSITION APPLICATION WITH	C. MINIMUM POSITION APPLICATION WITH
	CONTROLLER INPUT	BLEED TYPE THERMOSTAT INPUT (LP916)
		C4471A

Operation

SP970A Three Port Switches

PRESSURE REGULATOR OPERATION

Main line air flows through the restriction into the branchline chamber and out the nozzle. Branchline pressure increases until it is strong enough to compress the spring and lift the diaphragm off the nozzle. Air flow out the nozzle is controlled by the balance between the branchline pressure and spring force. See Typical Piping Diagram A Above.

MINIMUM POSITION OPERATION

See Typical Piping Diagram B above. An external signal is connected to Port 4 (Exhaust Port). When the external signal is greater than the spring load, the nozzle opens and branchline pressure is the same as the external signal. When the external signal is less than the spring load, branchline pressure is controlled as described above. See Operation Diagram below.

SP970A Operation

	SP970		SP970A
2		2
BRANCH		BRANCH
4	1	4	1
PILOT	MA N	P LOT	MAIN C4298A

SP970C Four Port Switches

These minimum position devices have a separate dead-ended chamber connected to Port 3 to receive an external signal. When the external signal is less than the spring load, the signal has no effect and functions similar to the SP970A as a pressure regulator. When the external signal is greater than the spring load, the spring load is isolated and the device duplicates the input signal. See Operation Diagram below.

Piping Diagram C above shows a typical four-port SP970C application. The minimum-position switch keeps the pneumatic actuator at a minimum position until the thermostat pressure is greater than the minimum position valves. The thermostat then controls the actuator.

SP970C Operation

PILOT	SP970C			SP970C
CHAMBER		DISC
3			3
PILOT			PILOT
BRANCH			BRANCH
2			2
4	1		4	1
VENT	MAIN		VENT	MAIN
A. BUILDING TO MINIMUM SETTING			C. PILOT BUILDING BRANCH ABOVE
			MINIMUM SETTING
	SP970C			SP970C
3			3
PILOT			PILOT
BRANCH			BRANCH
2			2
4	1		4	1
VENT	MAIN		VENT	MAIN
B. BALANCED AT MINIMUM SETTING			D. BALANCED AGAINST PILOT
				C4300A

694

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