RP470A AND B PNEUMATIC SELECTOR RELAYS
NOTE:
When the system is other than copper or poly-
ethylene tubing, adapt as shown in Fig. 3. Some
models provide parts for adapting.
CONNECT
1/4 IN.
(6 MM)
PLASTIC
CONNECT
1/4 IN.
(6 MM)
COPPER
RP470A/B
POST FOR
5/32 IN. (4 MM) O.D.
PLASTIC TUBING
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
C8235
Fig. 3. Adaptation piping.
Port Identification Tables
The following tables identify ports of older Honeywell
pneumatic relays when upgrading installation. Refer to
Tables 1 and 2.
Table 1. RP470A Connections for a Higher-of-Two
Pressures Application.
RP470A RP405A RP407 RP904A RO48B
Input A
3
P1
M
P1
1 & 2
Input B
5
P2
P
P2
4 & 5
Output
2
B
B1
B
3
Main
√
√
√
M
√
Table 2. RP470B Connections for a Lockout
Operation.
RP470B RP405A RP407 RP904A RO48B
Output
3
P1
M
P1
1 & 2
Pilot
5
P2
P
P2
4 & 5
Input
2
B
B1
B
3
Main
√
√
√
M
√
CHECKOUT AND TEST
RP470A - Higher-of-Two-Pressures Relay
Ensure that the higher-of-two-input pressures at Ports 3
and 5 is transmitted through output Port 2.
RP470B - Lockout Relay or Repeater
In a lockout relay application, ensure that the relay
passes the signal at Port 2 to Port 3 if the pressure at
Port 5 is lower than the pressure at Port 2. When the
pressure at Port 5 is greater than the pressure at Port 2,
lockout should occur.
In a lower-of-two-pressures application, make sure that
the output is the lower pressure.
ENGINEERING DATA
Specifications
Models:
RP470A Higher-of-Two Pressures Relay
RP470B Lockout Relay or Repeater
Operating Pressure Range:
Normal: 0 to 18 psi (0 to 124 kPa)
Maximum: 30 psi (207 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:
0.039 scfm at 1 psi (18 ml/s at
7 kPa) differential
Construction:
Molded plastic with neoprene diaphragm
and valox valve seat
Operation
RP470A
When the pressure at Port 3 is greater than the pressure
at Port 5 (Fig. 4A), Port 3 supplies the output through
Port 2 and the output at Port 2 equals the pressure at
Port 3. When the pressure at Port 5 is greater than the
pressure at Port 3 (Fig. 4B), Port 3 closes off and the
output at Port 2 equals the pressure at Port 5.
95-7231EF
2
