Specifications

Pressuretrol Controller
186 customer.honeywell.com 70-6910
PA404 Pressuretrol Controller
The PA404 is a series 40 (2-wire, SPST) pressuretrol controller for
use in 24, 120, 240 or 277 volt control circuits or in self powered
(millivoltage) applications.
• The PA404A is a pressure actuated high limit, safety control for
steam heating boilers; it breaks an electrical circuit to shut down the
burner if steam pressure rises above a safe level.
• The PA404B is used with suspension-type unit heaters to make the
fan circuit when a pressure rise indicates the presence of steam.
• Each model contains an SPST MICRO SWITCH snap-acting switch.
• Sensitive pressure-actuated diaphragm expands or contracts with
pressure variations, moving a lever mechanism which operates the
snap switch.
• A screw on top of the case allows set point adjustment without
removing the cover.
• Differential is adjusted by means of a dial located inside the case.
Dimensions, Approximate: 4 15/32 in. high x 3 3/8 in. wide x 2 1/4 in.
deep (114 mm high x 86 mm wide x 58 mm deep)
Electrical Ratings: 0.25 A @ 0.25 to 12 Vdc
120 Vac, Full Load: 8.0A
120 Vac, Locked Rotor: 48.0A
120 Vac, Resistive: 8.3A
240 Vac, Full Load: 5.1A
240 Vac, Locked Rotor: 30.6A
240 Vac, Resistive: 8.3A
277 Vac, Resistive: 7.2A
sealed: 150 VA @ 277 Vac
Differential Pressure Range: Additive or Subtractive: 1 to 5 psi Adj.
(Additive or Subtractive: 7 to 35 kPa Adj.)
Maximum Operating Pressure: 20 psi (137 kPa)
Pressure Ratings (Set Point): Recommended minimum set point is
differential setting plus 1 1/2 psi.
Pressure Surge (max.): 50 psi (345 kPa)
Pressure Sensing Element: Stainless Steel diaphragm
Adjustable Scale Range: 0.5 psi to 9 psi (3 kPA to 62 kPa)
Materials (Case): Gray enamel finish
Pipe Connections: 1/4 in. female pipe threads
Operating Humidity Range (% RH): 95% RH, non-condensing
Maximum Ambient Temperature: 150 F (66 C)
Approvals:
Canadian Standards Association: CSA Listed: File no. LR1620.
Underwriters Laboratories, Inc. UL Listed: File no. MP466, Guide no.
MBPR.
Product Number Application
Adjustable Operating Pressure Range
Switching Action Switch Type(psi) (kPa)
PA404A1025 Safety control for steam
heating boilers
3 psi to 15 psi 21 kPa to 103 kPa Makes at set point minus differential on
pressure fall; Breaks at set point on
pressure rise.
SPST snap-
acting switch
* PA404A1033 Safety control for steam
heating boilers
0.5 psi to 9.0 psi 3 kPa to 62 kPa Makes at set point on pressure fall; Breaks
at set point plus differential on pressure
rise.
SPST snap-
acting switch
* PA404B1023 Used with suspension type
unit heaters
0.5 psi to 9.0 psi 3 kPa to 62 kPa Breaks at set point on pressure fall; Makes
at set point plus differential on pressure
rise.
SPST snap-
acting switch
* TRADELINE models • SUPER TRADELINE models