Emerson Fluid Chiller Guía para resolver problemas descargar pdf (Pagina 69)

Problem Causes Corrective Action

Valve Won't Adjust or Is Erratic Dirt under seat

With system running, open the valve adjustment

to open the valve and flush away the contaminant.

If this fails, replace valve.

Valve Throttles Constantly

On system equipped with Hot Gas Bypas Valves,

the bypass valve setting is higher than CPR

Re-adjust bypass and/or CPR valve so that the

CPR setting is higher than the discharge bypass

valve

Temperature Pull-Down After Defrost is Too Long

TXV with MOP feature used with the CPR

To improve pull-down time, replace TXV with

equivalent without MOP feature

Valve setting is too low

Re-adjust the CPR to a higher setting - see

adjustment procedure

Troubleshooting Crankcase Regulators

Problem Causes Corrective Action

Low Suction Pressure - Valve Open Valve undersized Replace valve with correct size

Will Not Bypass - Valve Not Open

1. Solenoid (if present) not energized

2. Valve sticking closed

3. Not set properly

4. Bad pilot

1. Repair (replace solenoid coil)

2. Replace

3. Recalibrate

4. Replace

Suction Pressure Swings Erratically Oversi zed valve Replace valve with correct size

Bypass Continuously - Suction Pressure High

1. Manual stem screwed down

2. Valve sticking open

3. Bad pilot

1. Back stem out

2. Repair/replace valve

3. Replace pilot

Setpoint Drifts Bad pilot Replace pilot

Troubleshooting Hot Gas Regulators

Troubleshooting Regulators

Problem Causes Corrective Action

Erratic Pressure Control

Pilot inlet filter screen obstructed Clean or replace.

Piston bleed hole restriction

Disassemble valve and clean. Replace if

necessary.

Regulator Will Not Open

(EPRBS Version)

Excessive dirt in pilot/solenoid

Piston bleed hole restriction

Coil is damaged or not energizedVerify coil is energized. Replace if necessary.

Excessive Pressure Drop Across the Regulator

Piston bleed partially obstructedDisassemble and clean regulator.

Pilot or solenoid leaking internally Replace pilot assembly.

Regulator undersized

Refer to extended capacities table. Install correct

sized regulator.

Regulator Hunting

(Fluctuations in Controlled Pressure)

Piston bleed port obstructed

Clean or replace.

Pilot inlet filter screen obstructed

Regulator oversized

Refer to extended capacities table. Install correct

sized regulator.

Regulator and TXV ha

ve control interaction

Turn off pilot pressure. Ensure regulator is wide

open. Adjust superheat to required setting. Turn

pilot pressure back on.

Regulator and cylinder unloaders have control

interaction

The unloader should be set to control at least 5

psig lower than regulator.

Regulator Will Not Provide Pressure Control

Pilot inlet filter screen obstructed Clean or replace.

Pilot inlet pressure is too low

Increase pressure to a minimum of 25 psi higher

than the main valve outlet pressure.

Piston jammed due to excessive dirt; Inoperative

pilot or broken diaphragm

Locate and remove the stoppage or dirt. Replace

pilot. A broken diaphragm can be detected by

checking for leaks around the adjusting stem.

Regulator Will Not Close

(EPRBS Version)

Dirt under seat Disassemble and clean.

Excessive piston seal leakage Replace bell piston assembly.

Plugged pilot filter Clea

n or replace.

Pilot supply turned off or restricted

Verify pilot inlet pressure is at least 25 psig

greater than valve outlet.

Excessive dirt in pilot/solenoidReplace pilot assembly.

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Emerson Fluid Chiller Guía para resolver problemas Pagina 69

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