Component Operation and Maintenance

Manual Flushing—The valve may be flushed by rotating the socket head screw clockwise. This screw must be in the OUT position (counterclockwise) for normal valve operation.

Valve Disassembly

1.Shut off the water supply by using isolating valves.

2.Relieve the tension on the main spring by turning the adjusting screw (or collar) as far as it will go (provide a container to catch water below the valve).

3.Remove four screws extending through the main spring housing.

4.Remove the center assembly screws for access to all internal parts.

5.Clean the seat if possible. If the seat is pitted or damaged, replace the valve rubber disc and valve seat.

6.After valve is reassembled check for leaks.

7.Readjust head pressure control.

Testing Function of Valve—When the refrigeration system has been Off for approximately 10 to 15 minutes, the water flow should stop.

If the water continues to flow, the valve is either improperly adjusted (with head pressure too low) or the pressure sensing capillary is not connected properly to the condenser.

7.4.10Drycooler Settings

Applications with the Optional Stat Setting require field piping to be insulated to prevent condensa- tion. Table 8 shows acceptable applications where stats must be adjusted to Optional Setting. Aquastats must be field-adjusted to Optional Setting for:

•GLYCOOL/Dual Cool applications

•Single Drycooler loops with motor ball valve flow controls (motor ball valves are used on all Lie- bert Challenger 3000 and ITR units with digital compressors).

Table 8

Water/glycol system conditions requiring optional settings for aquastats

 

Cooling Type

 

Glycool

 

 

Glycol

 

 

 

 

 

 

 

 

 

Flow Control

MBV

WRV

MBV

WRV

 

 

 

 

 

 

 

 

 

Drycoolers in Loop

1

Multiple

1

Multiple

1

Multiple

1

Multiple

 

 

 

 

 

 

 

 

 

Stat Setting 1

Optional

Optional

Optional

Optional

Optional

Factory

Factory

Factory

Insulate Field Piping

Yes

Yes

Yes

Yes

Yes

No

No

No

 

 

 

 

 

 

 

 

 

 

1.See Table 9.

2.MBV=motor ball valve; WRV=water regulating valve

Table 9 Aquastat settings—two-fan through four-fan drycoolers

Dial Setting (Stat Open Temp) Set for Mid Differential 8°F (4.4°C) Rise to Close

 

 

Factory Setting

Optional Setting

Aquastat #

Fans

(Glycol) (see Notes 1 and 2)

(GLYCOOL) (see Note 3)

 

 

 

 

AQ1

F1

65°F (18.3°C)

35°F (1.7°C)

 

 

 

 

AQ2

F2 & F3

75°F (23.9°C)

45°F (7.2°C)

 

 

 

 

AQ3

F4

70°F (21.1°C)

40°F (4.4°C)

 

 

 

 

NOTE

1. All drycoolers are shipped at Factory Setting.

2.Factory Setting is used for all glycol applications, except single drycooler loops with motor ball valve controls.

3.Stats must be field-adjusted to Optional Setting for GLYCOOL/Dual Cool applications and all single drycooler loops using motor ball valve flow controls.

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Emerson 3000/ITR manual Drycooler Settings, Aquastat settings-two-fan through four-fan drycoolers
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3000/ITR specifications

The Emerson 3000/ITR is a powerful and versatile instrument designed for industrial automation and process control applications. This modular platform integrates advanced features and technologies tailored to meet the needs of diverse industries including oil and gas, pharmaceuticals, and manufacturing.

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