Honeywell P906C Bedienungsanleitung

P906C

Proportional

Differential Pressure Controllers

PRODUCT DATA

FEATURES

• Proportional control

• 4 – 20 mA current output

• Control range: 0 – 70 psi (0 – 483 kPa)

• Adjustable throttling range

APPLICATION

The P906C differential pressure controller

provides proportional control to maintain

the desired pressure difference between

two points in a water system. It is suitable

for use with modulating control valves to

regulate the by-pass differential pressure of

water chillers.

P906C PROPORTIONAL DIFFERENTIAL PRESSURE CONTROLLERS

SPECIFICATIONS

Operating Pressure psi (kPa)

Model

Control

Differential

Pressure Range

psi (kPa)

Minimum

Maximum

Output

P906C 0 – 70

(0 – 483) 5 (35) 225 (1551) 4 – 20 mA

Dimensions: See Fig. 1.

Electrical Ratings:

Power Supply: 220 Vac 50 Hz

Ambient Ratings:

Operating Temperature: 0 – 60 °C

Operating Humidity: 5 – 95% RH non-

condensing

Fig. 1. Dimensions of P906C in inch [mm].

INSTALLATION

When Installing this Product…

1. Read these instructions carefully.

Failure to follow them could damage the

product or cause a hazardous condition.

2. Check the ratings given in the

instructions and on the product to make

sure the product is suitable for your

application.

3. Installer must be a trained, experienced

service technician.

4. After installation is complete, check out

product operation as provided in these

instructions.

IMPORTANT

All wiring must agree with applicable

codes, ordinances and regulations.

! CAUTION

Electrical Shock or Equipment Hazard.

Can shock individuals or short

equipment circuitry.

Disconnect power supply before installation.

Location and Mounting

Mount the controller on a surface that is free

of excessive vibration. Level the control

using appropriate leveling devices.

NOTE: To prevent strain on the bellows, use

the proper fittings when connecting the

tubing or pipe to the bellows connections

(See Fig. 2). Use care when running lines so

that pipe dope and scale do not get into the

internal lines.

P906C PROPORTIONAL DIFFERENTIAL PRESSURE CONTROLLERS

WIRING

Disconnect power supply before beginning installation to prevent electrical shock and equipment

damage. All wiring must comply with local electrical codes and ordinances. See Fig. 3 and 4 for

typical system hookup and wiring.

Fig. 2. Recommended Tubing Fittings

Fig. 4. Typical Wiring Fig. 3. Typical System Hookup

OPERATION

Pressure Difference Adjustment

Because these controllers have such a wide

variety of applications, they are adjusted on

the job with the system in operation.

IMPORTANT

The device controls the difference between

the pressures exerted upon the 2 bellows,

not the gauge pressure.

1. Connect a pressure gauge with adequate

range to each element assembly.

2. Connect the differential pressure controller

and gauges to the pressure points to be

controlled.

3. Turn the pressure difference adjustment

screw counterclockwise (↖) until the scale

indicators reach the low (minimum) end of

the scale (Fig. 5).

4. Turn the throttling range adjustment screw

until the throttling range indicator is midway

between C and D on the throttling scale

plate.

NOTE: Do not go beyond the point at which

the linkage begins to show slack.

5. Apply typical operating pressures in

sequence to the left and right elements

(high and low pressure sides,

respectively). Turn the pressure

difference adjustment screw clockwise

() until the desired differential pressure

is reached.

6. Adjust the throttling range as needed.

To increase the throttling range, turn the

throttling range adjustment screw

clockwise (). To decrease the

throttling range, turn the throttling range

adjustment screw counterclockwise (↖).

7. Apply pressures through a typical cycle

while checking the differential pressure

controller operation. Readjust settings if

necessary. If there is any indication of

short cycling or a hunting condition,

increase the throttling range setting.

8. When the system operates as desired,

mark the settings on the scaleplate.

9. Remove the gauges and connect the

differential pressure controller into the

system with the higher pressure on the

left element and the lower pressure on

the right element.

CHECKOUT

Check operation of controller after installing in system.

Fig. 5. Internal View of the P906C Differential Pressure Controller

Honeywell Limited

25/F Honeywell Tower

Olympia Plaza

255 King’s Road

North Point, Hong Kong

0804

Pressure Difference

Adjustment Screw

Throttling Range Adjustment Screw

Throttling Range Scale Plate

Pressure

Difference

Scale Plate m

Out

ut Terminals

Power Supply

Terminals

Right Element

Assembly (Low

Pressure Side)

Left Element Assembly (High Pressure Side)

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