Install Instructions

RP471A Pneumatic
Snap-Acting Relay
INSTALLATION INSTRUCTIONS
DESCRIPTION
The RP471A Snap-Acting Relay is a two-position, four-
port, single-pole double-throw (SPDT), pneumatic switch
that provides positive switching action from modulating
signal lines with an adjustable switch point.
It has a slight air bleed in its pilot chamber that prevents
the device from locking up when the pilot port is blocked.
This bleed prevents air from being trapped in the circuit.
The switching setpoint is manually adjustable for 3 to
15 psi (21 to 103 kPa.)
The RP471A is designed for use in HVAC systems to
convert a gradual air pressure change from a controller
to a positive (two-position) pressure change at a
pneumatic valve or damper operator.
Fig. 1 shows RP471 approximate dimensions.
1-1/2
(38)
8
3
7
6
2-3/4
1-1/16
(26)
C8241
7
3
3/4
(19)
9
11
7
3
5
13
15
(70)
Fig. 1. RP471A dimensions in in. (mm).
INSTALLATION
Mounting
Suspend on tubing or mount on a surface. See Fig. 2 for
surface mounting. Use a 1-1/2 in. (38 mm) dia. metal
spring clip (supplied) and one No. 10 mounting screw
(locally purchased).
MOUNTING CLIP
RELAY
(PROVIDED)
DIAMETER OF
CLIP IS
NO. 10 X 1/2 IN.
1-1/2 IN. (38MM)
SHEET METAL SCREW
(OBTAIN LOCALLY)
C8244
Fig. 2. Surface mounting the RP471A
with a spring clip.
Piping
Fig. 3. shows adaptation 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.
NOTE: When the system is other than copper or poly-
ethylene tubing, adapt as shown in Fig. 3. Some
models provide parts for adapting.
® U.S. Registered Trademark
Copyright © 2002 Honeywell • All Rights Reserved
95-7252EF