Install Instructions

ManualsBrandsHoneywell ManualsDampers4 Port Ratio Relay (3 psi input span for 3 to 13 psi output)

RP971A

Pneumatic Ratio (Sequencing) Relay

INSTALLATION INSTRUCTIONS

DESCRIPTION

The RP971A Ratio Relay is a nonbleed, pneumatic relay

that produces a modulating pressure output in proportion

to pilot pressure input changes, and is suitable for use in

all types of pneumatic control systems. In a typical

application, two or three relays are used to control

pneumatic valve or damper actuators in sequence from a

single signal source.

Fig. 1 shows approximate dimensions in inches (millimeters).

(51)

2-5/8

(67)

C7459

PORT

Fig. 1. RP971A Dimensions,

INSTALLATION

Mounting

Suspend on tubing or mount on a surface (see Fig. 2).

WALL OR

PANEL

PART NO. 801629T

NO. 10 X 1/2 IN.

SHEET METAL SCREW

(OBTAIN LOCALLY)

RP971 RELAY

MOUNTED HERE

C8248

NOTE: INSIDE DIAMETER OF CLAMP 2IN. (51MM).

MOUNTING SCREW WHOLE DIAMETER IS

.20 IN. (5MM).

Fig. 2. Typical Surface Mounting.

Piping

Fig. 3 shows adaptation piping. Port 1 (Main, Supply)

sharp barb for 1/4-in. (6 mm) O.D. tubing. Ports 2, 3, and 4

(Branch, Output; Pilot, Input; and Exhaust, respectively),

sharp barb for 5/32-in (4 mm) O.D. tubing.

CAUTION

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.

NOTE: If the system is other than copper or polyethylene

tubing, adapt as shown in Fig. 3. Some models

provide parts for adapting.

95-7234

Summary of content (4 pages)

PAGE 1
RP971A Pneumatic Ratio (Sequencing) Relay INSTALLATION INSTRUCTIONS DESCRIPTION INSTALLATION The RP971A Ratio Relay is a nonbleed, pneumatic relay that produces a modulating pressure output in proportion to pilot pressure input changes, and is suitable for use in all types of pneumatic control systems. In a typical application, two or three relays are used to control pneumatic valve or damper actuators in sequence from a single signal source. Mounting Suspend on tubing or mount on a surface (see Fig.
PAGE 2
RP971A PNEUMATIC RATIO (SEQUENCING) RELAY PORTS 2, 3, & 4 Port Identification Table RP971 The shaded area of the following table identifies the ports on older Honeywell pneumatic relays when upgrading installation. POST FOR 5/32 IN. (4 MM) O.D. PLASTIC TUBING 5/32 IN. (4 MM) O.D. PLASTIC TUBING CUT TO LENGTH CCTI606B CONNECT 1/4 IN. (6 MM) PLASTIC CONNECT 1/4 IN. (6 MM) O.D. COPPER RP971A 5/32 IN. X 1/4 IN. (4 MM X 6 MM) O.D.
PAGE 3
RP971A PNEUMATIC RATIO (SEQUENCING) RELAY Construction: Molded plastic with neoprene diaphragm, stainless steel valve seats, and 100-mesh stainless steel filters in main and branch ports ENGINEERING DATA Specifications Model: RP971A Pneumatic Ratio (Sequencing) Relay ❑ 3 psi (21 kPa) pilot span ❑ 5 psi (90 kPa) pilot span Operation The effective area ratio between the pilot and feedback diaphragms controls the ratio between the pilot and branchline pressures. Fig. 4 shows a cutaway of typical operation.
PAGE 4
RP971A PNEUMATIC RATIO (SEQUENCING) RELAY Application Fig. 5 shows graphical examples of 3 and 5 psi (21 and 34 kPa) models. PILOT SPAN 3 PSI (21 kPa) START POINT PRESSURE 6 PSI (41 kPa) 15 (105) 13 (90) OUTPUT 10 SIGNAL (70) The RP971A is used to sequence damper actuators. Typically, it is used to sequence two to three actuators. See Fig. 6.