Rp971 Pneumatic Ratio Relay; Ratio - Honeywell Pneumatic Controls Engineering Manual

RP971 Pneumatic Ratio Relay

RP971A Typical Piping
ROOM
THERMOSTAT
3-6 PSI 6-9 PSI
M
(21-41 kPa)
(41-62 kPa)
3 3
PSP
4 1 2 4 1
PILOT START
6 PSI
POINT (PSP)
(41 kPa)
3 PSI (32 kPa)
EXH EXH
ALL DAMPER
ACTUATOR
SPRING RANGES
3-13 PSI
(20-90 kPa)
Product Number Operation
RP971A1007 Produces modulating
pressure output proportional
to pilot pressure input
changes
RP971A1015 Produces modulating
pressure output proportional
to pilot pressure input
changes
RP971A1023 Produces modulating
pressure output proportional
to pilot pressure input
changes
RP971A1031 Produces modulating
pressure output proportional
to pilot pressure input
changes
9-12 PSI
(62-83 kPa)
PSP 9 PSI
(62 kPa)
ALL THREE
3
RP971As
2 4 1 2
3 PSI
(32 kPa)
PILOT SPANS
EXH
M
C4478-1
Pilot Input Span
(psi)
3 psi input span for
3 to 13 psi output
5 psi input span for
3 to 13 psi output
—
—
A four port non-bleed pneumatic relay which produces a
modulating pressure output, proportional in a fixed ratio to pilot
input changes. It is used to control pneumatic valve or damper
actuators in sequence from a single thermostat. Replacement
devices are available for Johnson, Powers, Robertshaw, Barber-
Colman, and older Honeywell devices.
• Adjustable pilot start point pressures.
• Two pilot pressure spans available.
• Four sharp-barb air connections.
• Molded plastic construction with neoprene.
• Mounting clip provided.
Type: Pneumatic, Four Port Ratio Relay
Dimensions, Approximate: 2 in. diameter x 2 5/8 in. deep
(52 mm dia. x 67 mm deep)
Airflow Usage: 0.002 scfm (1.0 mL/s) maximum
Air Connections: Barb fittings, Port 1: 1/4 in. (6 mm) O.D. plastic
tubing; Other Ports: 5/32 in. (4 mm) O.D. plastic tubing
Action: Direct Acting
Capacity: 0.039 scfm at 1 psi differential (18 mL/s at 5 kPa differential)
Mounting: Wall or In-line or panel
Operating Humidity Range (% RH): 5 to 95% RH
Temperature Range: 0 F to 140 F (-18 C to +60 C)
Maximum Safe Operating Pressure: 30 psi (205 kPa)
Pilot Start Pressure: Adjustable 0 to 10 psi (Adjustable 0 to 69 kPa)
Output Span: 3 to 13 psi (21 to 90 kPa)
Accessories:
14003203-003 Conversion Kit to convert Johnson, Powers,
Robertshaw, Barber Coleman and older Honeywell switches
801629T Clip for surface mounting
(kPa) Description
— Wall, In-Line or panel
mounted Pneumatic
Four Port Ratio Relay
— Wall, In-Line or panel
mounted Pneumatic
Four Port Ratio Relay
21 kPa input span for Wall, In-Line or panel
21 to 90 kPa output mounted Pneumatic
Four Port Ratio Relay
34 kPa input span for Wall, In-Line or panel
34 to 90 kPa output mounted Pneumatic
Four Port Ratio Relay
70-6925
Relays
Includes
14003030-002 Mounting Clip and
scaleplate with psi markings
14003030-002 Mounting Clip and
scaleplate with psi markings
14003030-002 Mounting Clip and
scaleplate with kPa markings
14003030-002 Mounting Clip and
scaleplate with kPa markings
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