Pressure Controllers
Humidistats
and
Thermostats Controllers Sensors Relays Switches Actuators Valves Accessories
Engineering
Guide
Cross
Reference
70-6925 41
PP904 Static Pressure Regulators
One- or two-pipe, direct- or reverse-acting, low- or high-capacity
controller used with pneumatic actuators to regulate static or
differential pressure in central fan installations. Replacement
devices are available for Johnson, Powers, Robertshaw, Barber-
Colman, and older Honeywell devices.
• Adjustable setpoint and throttling range (Zero and span).
• Direct Acting (DA) and Reverse Acting (RA).
• Sharp-barb, push-on connectors for plastic tubing.
• Field calibration possible.
Dimensions in inches (millimeters) PP904A Typical Piping
PP904B Typical Piping
Application Type: Static or Differential Pressure
Airflow Usage: 0.022 scfm (10.0 mL/s) at 18 psi (124 kPa)
Connections: Main: Sharp-barbed fittings for 1/4 in. diameter tubing;
Branch: Sharp-barbed fittings for 5/32 in. diameter tubing
Mainline Air Pressure (min.): 16 psi (112 kPa)
Mainline Air Pressure (max.): 25 psi (175 kPa)
Maximum Safe Static Pressure: 28 in. wc (7 kPa)
Maximum Safe Operating Pressure:
25 psi (170 kPa)
Mounting: Duct mount
Temperature Range: 40 F to 120 F (5 C to 50 C)
Accessories:
14004238-001 Static Pressure Duct Head for 1/4 in., 6 mm diameter
Plastic Tubing
301298B Outdoor Static Pressure Head
A
8-1/4 (210)
2-1/4
(57)
FOUR
NO. 10
SCREWS
9 (229)
2-1/2 (63) MIN.
CLEARANCE
FOR COVER
REMOVAL
4-1/8
(105)
PIGTAILS (PP904A ONLY)
8-1/8 (206)
C3952
PIGTAILS (PP904A ONLY)
DAMPER
AUCTATOR
PP904A
M
M5561
DISCHARGE
AIR
STATIC
DUCT HEAD
TO REFERENCE
PRESSURE
NORMALLY
OPEN
A
C
M
B
PNEUMATIC
AUCTATOR
PP904B
M
M5562
DISCHARGE
AIR
RESTRICTOR
(FURNISHED)
NORMALLY
OPEN
DAMPER
A
C
DUCT
PP904B
HILO
Product Number Action
Number
of Pipes
Setpoint Range
Throttling Range
(in. wc) Comments(in. wc) (kPa)
PP904A1035 Reverse Acting,
Direct Acting
2 0 to +/-8 in. wc
(adjustable)
0 to +/-2 kPa
(adjustable)
0.03 to 0.5 in wc
(adjustable)
High capacity branchline
pressure
PP904B1009 Reverse Acting,
Direct Acting
1 0 to +/-8 in. wc
(adjustable)
0 to +/-2 kPa
(adjustable)
0.06 to 0.5 in. wc
(adjustable)
Low capacity branchline
pressure
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