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RP972A PNEUMATIC REVERSING RELAY
CONNECT
1/4 IN.
(6 MM)
PLASTIC
CCTI606B
CONNECT
1/4 IN. (6 MM)
O.D. COPPER
NOTE: PORT IS TYPICALLY NOT CONNECTED
TO
CONNECT
TO
1/4 IN. (6 MM)
O.D. PLASTIC
CONNECT
1/4 IN.
(6 MM)
O.D.
COPPER
Fig. 3. Adaptation piping.
NOTE: The RP972A is factory set at position B and in
most applications, does not need to be changed.
95-7148EF
For example: if in position B:
POST FOR
then the output is 16 ¬ 7 = 9 psi (62 kPa).
5/32 IN. (4 MM) O.D.
PLASTIC TUBING
The values of K are:
5/32 IN. (4 MM)
√ position A: 13 psi (90 kPa): used to ensure zero
O.D. PLASTIC
TUBING CUT
TO LENGTH
√ position B: 16 psi (110 kPa): used for 3-13 psi
√ position C: 18 psi (124 kPa): used for 3-15 psi
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)
Calibration
The small Allen hex screw in the middle of the slotted
plunger is for factory calibration. When required, the K
value can be shifted up to Ø 2 psi (Ø 14 kPa) with this
screw.
1/4 IN. (6 MM)
Checkout and Test
O.D. COPPER
TUBING
The RP972A Relay should reverse the branch line
signal. Check the following items:
POST FOR
1/4 IN. (6 MM)
PLASTIC
1/4 IN. (6 MM)
O.D. PLASTIC
NOTE: When there is no reversing or a high reverse
TUBING CUT TO
LENGTH
1/4 IN. (6 MM)
O.D. COPPER
ADAPTER
(CCTI633BT)
ENGINEERING DATA
Specifications
1/4 IN. (6 MM) O.D.
COPPER TUBING
Model: RP972A Pneumatic Reversing Relay
C8123
Operating Pressure Range:
Normal Main: 18 psi (124 kPa)
Maximum Safe Main: 30 psi (207 kPa)
Pilot: 3 to 15 psi (21 to 103 kPa)
2
Output = K ¬ Input
K = 16
Input = 7 psi (48 kPa),
output when input is limited to 13 psi (90 kPa)
maximum.
(21-90 kPa) operating range.
(21-103 kPa) operating range.
SLOTTED
PLUNGER
3
Fig. 4. RP972A showing slotted plunger
and three positions.
1. With zero pilot pressure and main line pressure
applied, branch line pressure should equal the K
value (in the above equation), or main line pres-
sure if it is lower than K.
2. Each psi (kPa) of pilot pressure increase should
result in a psi (kPa) of branch decrease.
signal occurs, recheck the setting of the slotted
plunger. It can be lodged between detentes.
Gently insert a screwdriver in the slot and twist it
back and forth. If the plunger is between set-
tings, it snaps into position. The plunger should
be flush with the top in position A and adjust
increasingly deeper in positions B and C.
POSITIONS
A, B, C
POSITION
IDENTIFIER
C8125
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