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The performance specifications are nominal and conform to acceptable industry standards. For applications at conditions beyond these specifications, consult the local Johnson Controls office.
Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products. © 2015 Johnson Controls, Inc. www.johnsoncontrols.com
R-89
P47 Series Steam Pressure Limit Control
Description
The P47 Controls are available with
single-pole, single-throw (SPST),
double-pole, single-throw (DPST), or
four-wire, two-circuit contacts for line voltage
or low voltage. The pressure connector is
1/4 in. external NPT (0 to 15 psi only) or
1/4 in. internal NPT (for all other ranges).
Refer to the P47 Series Steam Pressure
Controls Product Bulletin (LIT-125450) for
important product application information.
Features
• long-life contact structure with high contact
force
• easy-to-adjust single sight set scales show
both cut-in and cut-out settings
Applications
P47 steam pressure controls are designed for
high limit or operating control applications. A
typical use is as a limit control on steam
heating systems. Models that close on a
pressure increase are used on steam unit
heaters to avoid blower operation when
steam pressure is below the point required for
adequate heating. The P47 can be used with
steam, water, air, or noncombustible gases
that do not harm iron or copper.
Accessories
The Part No. TBG16A-600 Siphon is supplied
with all controls except models with
0 to 15 psi range.
Closes on Pressure Rise
P47BA
Opens on Pressure Rise
P47AA
SPST
p47ga_1.eps
P47GA
Four-Wire, Two-Circuit
Action on Pressure Rise
p47ga_2.eps
Selection Chart
Technical Specifications
Product
Code
Number
Switch Action Range
psi (kPa)
Diff psi (kPa) Max.
Over-pressure
psig (kPa)
Min. Max.
Contacts Open On Rise – Automatic Reset
P47AA-1C SPST 0 to 15 (0 to 103) 2 (14) 8 (55) 50 (345)
P47AA-4C 20 in. Hg to 50 (-68 to 345) 5 (34) 35 (241) 180 (1,241)
P47AA-13C 0 to 150 (0 to 1,034) 12 (83) 50 (345) 325 (2,241)
Contacts Close On Rise – Automatic Reset
P47BA-1C SPST 0 to 15 (0 to 103) 2 (14) 8 (55) 50 (345)
P47BA-6C 0 to 150 (0 to 1,034) 12 (83) 50 (345) 325 (2,241)
Four-Wire, Two Circuit
1
– Automatic Reset
1. The main contacts (Line-M2) open on rise, as the auxiliary contacts (Line-M1) close.
P47GA-9C
1
Main open high;
Auxiliary open low
0 to 150 (0 to 1,034) 12 (83) 50 (345) 325 (2,241)
P47AB-3C SPST 50 to 240 (345 to 1,655) Manual reset 300 (2,069)
P47EA-1C SPDT 50 to 240 (345 to 1,655) 10 (69) Fixed 300 (2,069)
Electrical Ratings for P47AA, P47AB, and P47BA
Motor Ratings VAC 120 208 240 277
AC Full Load A 16.0 9.2 8.0 –
AC Locked Rotor A 96.0 55.2 48.0 –
AC Non-Inductive A 16.0 16.0 16.0 16.0
Pilot Duty 125 VA, 120 to 600 VAC; 57.5 VA, 120 to 300 VDC
Electrical Ratings for P47EA
Motor Ratings VAC 120 208 240 277
AC Full Load A 16.0 9.2 8.0 –
AC Locked Rotor A 96.0 55.2 48.0 –
AC Non-Inductive A 16.0 10.0 10.0 10.0
Pilot Duty 125 VA, 120 to 227 VAC
Electrical Ratings for P47GA
Pole Number Line-M2 (Main) Line-M1 (Auxiliary)
Motor Ratings VAC 120 208 240 277 120 208 240 277
AC Full Load A 16.0 9.2 8.0 – 6.0 3.3 3.0 –
AC Locked Rotor A 96.0 55.2 48.0 – 36.0 19.8 18.0 –
AC Non-Inductive A 16.0 9.2 8.0 7.2 6.0 6.0 6.0 6.0
Pilot Duty: Both Poles 125 VA, 120 to 600 VAC; 57.5 VA, 120 to 300 VDC
P47AA-1 Steam Pressure Limit
Control
Standard Electromechanical Pressure Controls
Code No. LIT-1927205
Repair Information
If the P47 Series Steam Pressure Limit Control
fails to operate within its specifications, replace
the unit. For a replacement control, contact the
nearest Johnson
Controls® representative.