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PRODUCT DATA

65-0268-1

® U.S. Registered Trademark
Copyright © 2002 Honeywell •  All Rights Reserved 

P7810A-D

Pressuretrol® Controller

APPLICATION

The P7810 Pressuretrol® Controller is a line voltage pressure 

controller for pressure systems up to 300 psi (2069 kPa). Four 

models are available:

• P7810A—On/Off Control

• P7810B—On/Off Control with 4 to 20 mA modulation.

• P7810C—On/Off Control, High Limit and 4 to 20 mA 

modulation.

• P7810D—On/Off Control with High Limit.

FEATURES

• Use only with steam, air or noncombustible gases that 

do not corrode the pressure sensing element.

• Models available with on-off control function, on-off 

control and modulate, high limit and modulate, and 

on-off control and safety high limit functions.

• Models available in 15, 150 and 300 psi (103, 1034 and 

2069 kPa) maximum setpoints.

• LED indicators show power, call for heat function and 

lockout status.

• Clear cover allows setpoint and differential to be read, 

but not adjusted, without opening cover, (Cover 

optional for P7810A,B models.)

• Manual reset possible without opening cover.
• Electronic maximum fixed stop limit.

P7810A, B

P7810C, D

Contents

Application ........................................................................

1

Features ...........................................................................

1

Specifications ...................................................................

2

Ordering Information  ........................................................

2

Installation ........................................................................

3

Wiring ...............................................................................

5

Operation ..........................................................................

7

Checkout .......................................................................... 11

Troubleshooting ................................................................ 12

Service Information  .......................................................... 12

Summary of Contents for Pressuretrol P7810A

Page 1: ...rode the pressure sensing element Models available with on off control function on off control and modulate high limit and modulate and on off control and safety high limit functions Models available in 15 150 and 300 psi 103 1034 and 2069 kPa maximum setpoints LED indicators show power call for heat function and lockout status Clear cover allows setpoint and differential to be read but not adjust...

Page 2: ...ntact Ratings a P7810C D models only Sensor Material 304 stainless steel Pressure Connector P7810A B 1 4 in NPT P7810C D 1 2 in NPT Case Material Plastic Electrical Terminations Screw terminals Accuracy 4 0 percent full scale output operating range over operating temperature Environmental Ratings Operating Temperature Range 32 F to 140 F 0 C to 60 C Storage Temperature Range 20 F to 150 F 29 C to ...

Page 3: ...fore removing old control 3 Follow all installation and checkout procedures for safe installation IMPORTANT Do not remove the overpressure inlet seal until ready to connect piping to prevent contamination of inlet Location Install the P7810 Pressuretrol Controller above the boiler water line when used with steam boilers Connect the siphon loop part number 14026 for P7810A B 209731A for P7810C D or...

Page 4: ...with an approved weather tight enclosure CAUTION Equipment Damage Hazard Incorrect installation of the L404 Pressure Controller can damage the equipment and may require boiler replacement Install the L404C Pressuretrol as shown in Fig 2 and 3 to prevent equipment damage Fig 2 Connecting P7810A B Pressuretrol Controller to steam boiler Fig 3 Right and wrong mounting of steam trap siphon loop for th...

Page 5: ...onnect may be involved All wiring must comply with applicable electrical codes ordinances and regulations Use NEC Class 1 line voltage wiring For normal installation use moisture resistant No 14 wire maximum size allowed suitable for at least 167 F 75 C or 194 F 90 C for Flame Safeguard Primary Controls Use shielded wire for 4 to 20 mA modulating output and terminate the shield to earth ground Do ...

Page 6: ...1 2 12 13 15 14 R B W 4 TO 20mA ALARM FIELD WIRING 2K1 1K1 DEVICE WIRING OUTPUT 3K1 14 LOW FIRE 15 MODULATE 13 COMMON 8K1 8K2 9K2 9K1 AUTO MAN 66 5 OHM 237 OHM 12 HIGH FIRE 7800 SERIES PROGRAMMER W M20568C R B MODUTROL IV MOTOR CONTROLLER P7810 4 2O mA SERIES 90 1K OHM 7800 SERIES SHOWN REFER TO SPECIFICATIONS PACKED WITH THE PROGRAMMER FOR WIRING OF OTHER PRIMARY SAFETY CONTROLLERS 1 1 LOW FIRE 1...

Page 7: ...ferential setting This cycle continues until power is removed opening the relay See Fig 11 Fig 11 P7810 on off control function versus pressure Modulate Control Function P7810B C Only When the pressure decreases to or below the modulation setpoint the current is 20 mA The current remains constant at all pressures below the modulation setpoint The modulation range is an additive value to the modula...

Page 8: ...ed Stop Limit Value P7810C D CAUTION Equipment Damage Hazard Exceeding pressure vessel limits can damage equipment The Maximum Fixed Stop Limit pressure setting must not exceed the maximum working pressure rating of the pressure vessel Adjust the Maximum Fixed Stop Limit setting to maximum working pressure rating that is stamped on the pressure vessel by the manufacturer IMPORTANT The Maximum Fixe...

Page 9: ...g fault code until the reset switch is released Both LEDs turn on after three seconds indicating the Maximum Fixed Stop Limit Value has been stored Wait for up to 30 seconds for a release Enter lockout after 30 seconds The green LED turns off and the yellow LED turns on waiting until the reset switch is released Both LEDs turn on Wait for up to 30 seconds for a release Lockout after 30 seconds If ...

Page 10: ...te Control P7810B C Only The P7810B C adds 4 to 20 mA modulation output and uses two additional potentiometers The pressure sensor output is fed to an error and gain amplifier to perform the modulation determined by the control potentiometer settings The potentiometer knobs mounted on the P7810B C face adjust the current output for a given set of pressures The modulation range is an additive value...

Page 11: ...form these tests the boiler pressure should be near the middle of the P7810 pressure range 2 Turn the P7810 limit setpoint knob fully clockwise to make sure this limit does not interfere during steps 4 and 5 This setting must return to the proper operating position when returning the system to normal operation 3 Check the control setpoint and control differential 4 Set the control differential kno...

Page 12: ...obs to the required operating position 2 Press the reset button to clear the safety lockout condition 3 Start the system and observe the operation through at least one complete cycle to make sure the P7810 functions properly as described in the Operation section TROUBLESHOOTING WARNING Electrical Shock Hazard Can cause severe injury death or property damage Line voltage is present at the P7810 and...

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