Troubleshooting Suggestions; Warranty - Parker A4W Series Installation And Service Information

SYMPTOM PROBABLEREASON
Regulator does not Diaphragm or Pilot Seat dirty, damaged
shut off flow. or frozen.
Diaphragm follower stuck or damaged.
Piston jammed with excess dirt.
Modulating plug leaking due to excess dirt
or damage.
Diaphragm and Pilot Seat
eroded due to flash gas.
Regulator does not Diaphragm ruptured
open. or badly deformed.
Diaphragm Follower stuck, damaged
or frozen.
Piston Seal Ring worn or torn.
Regulator Operation Diaphragm or Pilot Seat dirty
erratic. or damaged.
Diaphragm Follower has dirt on the outside
diameter or outside diameter is damaged.
Other system components, line controllers,
thermostats, etc., erratic.
Regulator too far oversized.
Pressure drop across Inlet or outlet restricted.
regulator too high.
Regulator too small.
High pressure drop causes high rate of
expansion gas at regulator outlet..
Regulator does not open all of the way.

Warranty

All Refrigerating Specialties Products are warranted against defect in
workmanship and materials for a period of one year from date of shipment
from factory. This warranty is in force only when products are properly
installed, field assembled, maintained and operated in use and service as
specifically stated in Refrigerating Specialties Catalogs or Bulletins for
normal refrigeration applications, unless otherwise approved in writing by
Refrigerating Specialties Division. Defective products, or parts thereof,
returned to the factory with transportation charges prepaid and found to
be defective by factory inspection will be replaced or repaired at
Refrigerating Specialties' option, free of charge, F.O.B. factory. Warranty
does not cover products which have been altered or repaired in the field;
damaged in transit, or have suffered accidents, misuse, or abuse. Products
disabled by dirt or other foreign substances will not be considered defective.
THE EXPRESS WARRANTY SET FORTH ABOVE CONSTITUTES THE
ONLY WARRANTY APPLICABLE TO REFRIGERATING SPECIALTIES
PRODUCTS, AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS
OR IMPLIED, WRITTEN OR ORAL, INCLUDING ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. No
employee, agent, dealer or other person is authorized to give any warranties
on behalf of Refrigerating Specialties, nor to assume, for Refrigerating
Specialties, any other liability in connection with any of its products.
Refrigerating Specialties Division
TROUBLE SHOOTING SUGGESTIONS
CORRECTION
Clean or replace. Clean strainer.
Clean or replace. Install follower carefully.
Remove Piston and clean dirt from Seal Ring and groove.
Clean bore with crocus cloth. Clean valve and strainer.
Clean or replace Modulating Plug and or Valve Seat.
Replace. Reduce flash gas by reducing amount of liquid in suction
line. For example, reduce rate of liquid overfeed.
Replace. If Range D make sure two
diaphragms are installed.
Clean or replace.
Install follower carefully.
Replace Seal Ring. Check for reason.
Clean or replace. Clean strainer.
Clean or replace.
Adjust, repair or replace.
Check load. Replace with smaller regulator. If load has wide variation,
consider using two smaller regulators in parallel. Check with factory.
Check for restriction.
Clean strainer.
Replace with properly sized regulator.
Increase pipe size at the outlet of the
regulator.
Check Piston Seal Ring for wear.
Replace and determine cause for wear.
Safe Operation (See also Bulletin RSBCV)
People doing any work on a refrigeration system must be qualified and
completely familiar with the system and the Refrigerating Specialties
Division Products involved, or all other precautions will be meaningless.
This includes reading and understanding pertinent Refrigerating Specialties
Division Product Bulletins, and Safety Bulletin RSBCV prior to installation
or servicing work.
Where cold refrigerant liquid lines are used, it is necessary that certain
precautions be taken to avoid damage which could result from liquid
expansion. Temperature increase in a piping section full of solid liquid will
cause high pressure due to the expanding liquid which can possibly rupture
a gasket, pipe or valve. All hand valves isolating such sections should be
marked, warning against accidental closing, and must not be closed until
the liquid is removed. Check valves must never be installed upstream of
solenoid valves, or regulators with electric shut-off, nor should hand valves
upstream of solenoid valves or downstream of check valves be closed
until the liquid has been removed. It is advisable to properly install relief
devices in any section where liquid expansion could take place.
Avoid all piping or control arrangements which might produce thermal or
pressure shock.
For the protection of people and products, all refrigerant must be removed
from the section to be worked on before a valve, strainer, or other device
is opened or removed.
Flanges with ODS connections are not suitable for ammonia service.
9