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70-6925 59
RP971 Pneumatic Ratio Relay
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.
RP971A Typical Piping
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
EXH
EXH
3-6 PSI
(21-41 kPa)
6-9 PSI
(41-62 kPa)
9-12 PSI
(62-83 kPa)
ROOM
THERMOSTAT
ALL DAMPER
ACTUATOR
SPRING RANGES
3-13 PSI
(20-90 kPa)
C4478-1
EXH
PILOT START
POINT (PSP)
3 PSI (32 kPa)
PSP
6 PSI
(41 kPa)
PSP 9 PSI
(62 kPa)
ALL THREE
RP971As
3 PSI
(32 kPa)
PILOT SPANS
M
M
4 1
3
2 4 1
3
2 4 1
3
2
Product Number Operation
Pilot Input Span
Description Includes (psi) (kPa)
RP971A1007 Produces modulating
pressure output proportional
to pilot pressure input
changes
3 psi input span for
3 to 13 psi output
— Wall, In-Line or panel
mounted Pneumatic
Four Port Ratio Relay
14003030-002 Mounting Clip and
scaleplate with psi markings
RP971A1015 Produces modulating
pressure output proportional
to pilot pressure input
changes
5 psi input span for
3 to 13 psi output
— Wall, In-Line or panel
mounted Pneumatic
Four Port Ratio Relay
14003030-002 Mounting Clip and
scaleplate with psi markings
RP971A1023 Produces modulating
pressure output proportional
to pilot pressure input
changes
— 21 kPa input span for
21 to 90 kPa output
Wall, In-Line or panel
mounted Pneumatic
Four Port Ratio Relay
14003030-002 Mounting Clip and
scaleplate with kPa markings
RP971A1031 Produces modulating
pressure output proportional
to pilot pressure input
changes
— 34 kPa input span for
34 to 90 kPa output
Wall, In-Line or panel
mounted Pneumatic
Four Port Ratio Relay
14003030-002 Mounting Clip and
scaleplate with kPa markings