Honeywell SP970A User Manual

SP970A, B, C and D Manual and

Minimum Position Pressure Regulators

INSTALLATION INSTRUCTIONS

DESCRIPTION

The SP970A, B, C and D Manual and Minimum Position Pressure Regulators provide regulated pressure to a

(22)

FRONT VIEW SIDE VIEW

1-9/16

(40)

2-1/4

100

(57)

2-1/2

(63)

Fig. 1. SP970A and C dimensions in in. (mm).

100

controlled device such as a pneumatic damper operator. It provides either manually set pressure or manually set minimum pressure with variable maximum pressure.

Figs. 1 and 2 show approximate dimensions.

7/8

1-7/8

(48)

1-1/2

(38)

SP970C 3-7/8 (98)

4-1/2 (114)

SP970A 3-1/2 (89)

C4857

2-1/16 (62)

3-1/4 (83)

FRONT VIEW

Fig. 2. SP970B and D dimensions in in. (mm).

7/8

(22)

(25)

3-1/2 (89)

SIDE VIEW

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SP970A, B, C AND D MANUAL AND MINIMUM POSITION PRESSURE REGULATORS

BEFORE INSTALLATION

SP970A and C only

For panels having a thickness greater than 5/16 in. (8 mm) but less than one in. (25 mm), use 315677A Bus Assembly.

INSTALLATION

Mounting

The SP970A and C can be panel, surface or wall mounted. The SP970B and D are surface or wall mounted. See Fig. 3 and 4.

8 PSI

CENTER PUNCH MARK IN "V" GROOVE SHOWING 8 PSI (55 kPa) CALIBRATION ENLARGED

SP97O

HEX NUT

CENTER

PUNCH

MARK IN "V"

GROOVE

Fig. 3. SP970A and C panel mounting.

SP970A AND C

SP970 SWITCH

Fig. 4. SP970 surface or wall mounting.

Panel Mounting SP970A and SP970C

1. Drill a 5/8 in. (16 mm) hole.

2. Lock the SP970 switch and scaleplate to the panel

with a hex nut on the back of the panel. Use a second hex nut on the front panel. See Fig. 3.

MOUNTED

HERE

SHAFT

SCREW

SPRING CLIP

C8275

PANEL-UP TO 5/16 IN. (8MM) THICK

5/8 IN. (16MM) DIA. HOLE

100

SP970B AND D

SCALEPLATE

HEX NUT

100

C8277

KNOB

C8278

NOTES:

√ The scaleplate, knob and two mounting nuts

are furnished with SP970A and C.

√ Do not mount the knob during installation.

Refer to the Calibration section of this document.

Surface Mounting

Use the mounting bracket as a template and secure mounting bracket to surface. See Fig. 4. Screws are not provided.

Piping

All connections are sharp barb 5/32 in. (4 mm) O.D. polyethylene tubing.

CAUTION

Equipment Damage Hazard.

To prevent damage to the sharp barb connections, do not attempt to cut or pull tubing. To remove the tubing from the barb connections, cut tubing a few inches from the control device. Use a coupling to reconnect tubing.

NOTES: When the system is not copper or polyethylene

tubing, adapt as shown in Fig.5. Some models provide parts for adapting.

SP970A-D

POST FOR 5/32 IN. (4 MM) O.D. PLASTIC TUBING

CONNECT

1/4 IN. (6 MM)

PLASTIC

CONNECT

1/4 IN. (6 MM)

COPPER

Fig. 5. Adaptation piping.

Port Identification Table

The two right columns in Table 1 identifies the ports of older Honeywell pneumatic relays when upgrading installation.

5/32 IN. (4 MM) O.D. PLASTIC TUBING CUT TO LENGTH

5/32 IN. X 1/4 IN. (4 MM X 6 MM)

O.D. PLASTIC CONNECTOR (CCTI606B)

1/4 IN. (6 MM) O.D. PLASTIC TUBING CUT TO LENGTH

1/4 IN. (4 MM) O.D. PLASTIC/COPPER ADAPTER (CCTI633BT)

1/4 IN. (6 MM) O.D. COPPER TUBING

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SP970A, B, C AND D MANUAL AND MINIMUM POSITION PRESSURE REGULATORS

Table 1. Port Identification.

SP970A Pressure

Regulator SP970A Minimum Position SP970B SP970C, D SP92 SP93

Main 1 1 1 1 2 M Pilot √ 4 √ 3 4 P Branch 2 2 2 2 3 B Exhaust 4 √ 4 4 √ √

Calibration

All SP970A and C models are calibrated at 8 psi (55 kPa) when the calibration mark (center punch) on the shaft is centered at the bottom of the molded V. To calibrate, align the center punch mark on the shaft with the bottom of the molded V groove on the plastic surrounding shaft. See Fig. 3. This setting equals 8 psi (55 kPa). Secure the knob to the shaft at the proper scale setting. The knob should be pointing to 8 psi (55 kPa). See Fig. 4.

All SP970B and D models are calibrated at 8 psi (55 kPa) when the knob is set at 50 percent.

The large range device can be field recalibrated to other end points with the same span from 0 psi (0 kPa) lower limit to 26 psi (179 kPa) upper limit. The small range device can be field recalibrated to other end points with the same span from 0 psi (0 kPa) lower limit to 16 psi (110 kPa) upper limit.

Checkout and Test for All Models

1. With main air connected, insert a pressure gage

into the branch line.

2. Check pressures equivalent to knob settings.

3. When minimum position is used, attach input and

increase pilot pressure.

4. Verify correct operation.

ENGINEERING DATA

Specifications

Models:

- SP970A: A bleed type pressure regulator.

- SP970B: A bleed type pressure regulator mounted on a sheet metal panel.

- SP970C: A bleed type pressure regulator with a dead ended pilot chamber for minimum pressure applications.

- SP970D: A bleed type pressure regulator with a dead ended pilot chamber for minimum pressure applications mounted on a sheet metal panel.

Selectable Spans for psi (kPa): See Table 2.

Table 2. Selectable Spans.

Knob Rotation

Model

188 244 300

Small span 5 (34) 6.5 (45) 8 (55) Large span 10 (69) 13 (90) 16 (110)

The setpoint knob normally rotates 188 degrees. Two breakaway stops on the knob allow rotation of 244 and 300 degrees.

Operating Pressure (Switch and Pilot) Range:

Normal Main: 18 psi (124 kPa) Branch: 3 to 15 psi (21 to 103 kPa) Pilot: 3 to 15 psi (21 to 103 kPa)

Maximum Safe Air Pressure: 30 psi (207 kPa)

Ambient Operating Limits:

Temperature: 0 to 140°F (-18 to 60°C) Relative Humidity : 5 to 95%

Air Handling Capacity:

SP970A, B: above minimum position, device feeding

pilot determines capacity. Below minimum position, air capacity is 0.022 scfm (10 ml/s)

SP970C, D: 0.022 scfm (10 ml/s)

Air Consumption: 0.022 scfm (10 ml/s)

Scaleplate: All models ship with a 0 to 100 scaleplate

(including knob and locknuts).

Construction: Molded plastic with neoprene diaphragm, steel spring and shaft.

Operation

SP970A and B: 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. Airflow out the nozzle is controlled by the balance between the branchline pressure and spring force.

MINIMUM POSITION OPERATION

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 in the previous paragraph. See Fig. 6.

2 2

BRANCH

PILOT

MAIN

Fig. 6. SP970A/B operation.

SP970A,B

BRANCH

PILOT

SP970A,B

MAIN

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