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Master Catalog 125

Pressure Controls Section P

Product/Technical Bulletin P470

Issue Date 1100

Part No. 24-7664-2004, Rev. — www.johnsoncontrols.com

Code No. LIT-125528

The P470 Electronic Pressure Control with Display is a

single-stage, On/Off, electronic pressure control with

an SPDT (Single-Pole Double-Throw) output relay.

The control may be field set to operate in one of

three pressure ranges (0 to 100 psi, 0 to 500 psi, or

50 to 750 psi), as either an open-high or open-low

control.

The P470 control features a large LCD that displays

the sensed pressure and other system-status

indicators, as well as the adjustable setpoints in the

programming mode. The P470 control has a lockable,

3-button touchpad for adjusting setpoints, and a

front-panel LED (Light-Emitting Diode) that indicates

the output relay status.

The P470 control uses a P399 Electronic Pressure

Transducer to generate a pressure signal and

WHA-P399 Wiring Harness, which eliminates many of

the constraints of capillary-tube control applications.

Figure 1: P470 Pressure Control with a P399

Transducer and WHA-P399 Wiring Harness

(Control, transducer, and harness must be

purchased separately.)

Features and Benefits

❑

Easy to Read Liquid Crystal

Display (LCD)

Clearly displays the sensed pressure

(and other control information), and in many

situations pressure may be monitored without

applying gauges to the controlled equipment

❑

Three Field-Selectable

Pressure Ranges Between

0-750 psi

Provides the flexibility to cover most HVAC/R

pressure applications with three field-

selectable pressure ranges; 0-100 psi with

5 psi minimum differential, and 0-500 psi or

50-750 psi with 20 psi minimum differential

❑

24 VAC, and 120 or

208/240 VAC Models

Increases application options, with two controls

that cover most common voltages

❑

Lockable, 3-Button,

Front-Panel Touchpad

Deters tampering and over adjustment of

control settings by unauthorized personnel

❑

Built-in, Adjustable,

Anti-Short Cycle

Time-Delay

Reduces compressor short cycling and

nuisance lockouts, which can extend

compressor life

❑

Uses an Economical and

Versatile Transducer and

Wiring Harness

Eliminates many of the constraints of capillary

control applications and allows up to a 100 ft

(30.5m) cable between control and transducer

P470 Electronic Pressure Control with Display

Summary of content (12 pages)

PAGE 1
Master Catalog Pressure Controls Section Product/Technical Bulletin Issue Date 125 P P470 1100 P470 Electronic Pressure Control with Display The P470 Electronic Pressure Control with Display is a single-stage, On/Off, electronic pressure control with an SPDT (Single-Pole Double-Throw) output relay. The control may be field set to operate in one of three pressure ranges (0 to 100 psi, 0 to 500 psi, or 50 to 750 psi), as either an open-high or open-low control.
PAGE 2
A pplication IMPORTANT: The P470 Electronic Pressure Control is intended to control equipment under normal operating conditions.
PAGE 3
D imensions 9/64 (4) 1/2 (13) 2-3/8 (61) P470 DIN Rail Mount 2-15/16 (75) MENU 5 (127) 4 (102) 1-9/16 (40) 7/16 (11) 2-3/8 (61) P399 Electronic Pressure Transducer 2-3/8 (61) 1 (26) 2-1/2 (64) (Maximum) 0.85 (21) 7/8 (1/2 in. Trade Size) (22) Conduit Hole Figure 2: P470 Electronic Pressure Control Dimensions, inches (mm) Liquid Crystal Display The P470 control has a LCD that displays the sensed pressure during normal operation. See Figure 3.
PAGE 4
When the cut-in and cutout values are established, the P470 control automatically determines the control operation and displays either an Open-high ( ) or Open-low ( ) icon in the lower right of the LCD during normal operation. See Figure 3. The cut-in (ci1) and cutout (co1) values establish the primary setpoints (S1). A secondary set (S2) of cut-in (ci2) and cutout (co2) values may be also be set.
PAGE 5
The P470 control uses a P399 transducer to generate the 0.5 to 4.5 VDC input signal. The transducer is wired to the control at the terminal block (TB3) on the upper-left of the circuit board. Refer to Figures 4-7 when wiring the transducer to the control. Connect the cable shield to COM on the TB3 terminal block. Do not connect the other end of the cable shield to anything.
PAGE 6
A djustments This section provides instructions for setting up and adjusting the P470 control using the internal jumpers and front panel touchpad. 3. Position the jumpers to set the desired operating pressure range and lock or unlock the touchpad. 4. Replace the cover, and restore power to the control. Positioning the Jumpers IMPORTANT: The P5 jumper-pin terminal has a single pair of jumper pins and is used to lock or unlock the touchpad.
PAGE 7
Changing Setpoint Values and Anti-short Cycle Delay Time-Interval Scrolling Through the Adjustable Setpoints Follow the steps below to change the P470 control setpoint values and anti-short cycle delay time-interval. Figure 10 illustrates the order of the adjustable setpoints displayed when scrolling through them using the Up or Down buttons. Press the Up button to scroll through and display the adjustable setpoints in a clockwise direction.
PAGE 8
T roubleshooting ! 1. Check for proper supply voltage to the control. WARNING: Risk of Electrical Shock. To perform the following procedures, it may be necessary to power the control and the controlled equipment while the control cover is removed. Do not touch any exposed metal components with anything other than properly insulated tools or insulated probes of the digital voltage meter.
PAGE 9
Since the measured pressure, psiT (245 psi), is close to the pressure (248.1 psi) calculated from the measured voltage, the transducer output voltage is considered acceptable. 3. Check pressure transducer for proper output signal voltage. a. Measure and record the voltage (Vo) between the SEN and the COM terminals on the control terminal block. Note: b. At the same time, observe and record the pressure reading (psiT) on the gauge. Output Voltage (% of Power Supply) 4.
PAGE 10
e. (Refer to Figure 12.) If the control is operating as an open-high control and: f. (Refer to Figure 13.) If the control is operating as an open-low control and: The LED is Off. Increase cutout setpoint above the displayed pressure by the minimum differential pressure (for the selected operating pressure range) plus 10 psi. Then increase the cut-in setpoint above the displayed pressure by 5 psi. The LED should go On (and the N.O. contacts close). The LED is Off.
PAGE 11
Table 2: Display Codes and How to Respond to Them Flashing Display Code What the Display Codes Indicates, and How to Respond to Them EE Indicates the control’s operating pressure range has been changed, both P6 jumpers are in the Installed position, or a program failure has occurred. Ensure that the P6 jumpers are positioned for the correct pressure range. (See Table 1.) Press the Menu button twice to reset the control for a new operating pressure range.
PAGE 12
Specifications Product Operating Pressure Ranges P470 Electronic Pressure Control with Display 0 to 100 psi 0 to 500 psi 50 to 750 psi Minimum Differential Pressure 5 psi 20 psi 20 psi Displayed Resolution 1 psi 3 psi 5 psi Control Accuracy Supply Voltage Power Consumption Output Relay Contacts Electrical Ratings + 1.5 % of selected Operating Pressure Range plus transducer accuracy P470FB-1: P470EB-1: 24 VAC, 50/60 Hz, Class 2 120 or 208/240 VAC, 50/60 Hz 1.