Concoa 308 Series User manual

INSTALLATION AND OPERATION INSTRUCTIONS
This Equipment is intended to be installed and operated by trained personnel.
Certified ISO 9001
ADI 3005-D
Controls Corporation of America
1501 Harpers Road Virginia Beach, VA 23454
To Order Call 1-800-225-0473 or 757-422-8330 • Fax [phone]
www.concoa.com
Before Installing or Operating, Read and Comply with These Instructions
308 Series
Heated
Regulator
®
July 2017
Supersedes August 2002

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USER RESPONSIBILITY
This equipment will perform in conformity with the description thereof
contained in this manual and accompanying labels and/or inserts when
installed, operated, maintained, and repaired in accordance with the
instructions provided. This equipment must be checked periodically.
Defective equipment should not be used. Parts that are broken, missing,
worn, distorted or contaminated, should be replaced immediately. Should
such repair or replacement become necessary, CONCOA recommends
that a telephone or written request for service advice be made to CONCOA
Customer Service in Virginia Beach, Virginia, PHONE: [phone],
FAX: [phone], or E-MAIL: [email protected].
This equipment or any of its parts should not be altered without prior
written approval by CONCOA. The user of this equipment shall have the
sole responsibility for any malfunction that results from improper use,
faulty maintenance, damage, improper repair, or alteration by anyone
other than CONCOA or a service facility designated by CONCOA.
CUSTOMER SERVICE
In the event of equipment failure, call CONCOA Customer Service. Please
be prepared to provide the model number and serial number of the
equipment involved, in addition to some details regarding its application.
GENERAL SAFETY PRACTICES
This regulator is not for use with ammable gases.
Specic procedures for the safe use of this equipment are listed below.
a. The regulator relief valve protects only the regulator and is
not intended to protect any other equipment. Be sure the
equipment with which it is used is also protected by relief
device(s) if such equipment can not withstand full cylinder
pressure.
b. Never use the regulator for gases other than labeled. It is
designed to withstand 3000 psig maximum inlet pressure.
c. All connections to the regulator must be clean. Remove dirt or
other foreign matter from the regulator and metal connecting
parts with a clean lint free cloth. Be sure to use a new gasket
for each installation when a gasket is used.
!
SAFETY

4
Provide sucient ventilation to prevent toxic accumulation in breathing
air. Avoid prolonged or repeated breathing of vapor or contact with skin.
Do not take internally.
d. Never pressurize a regulator that has loose or damaged parts
or is in questionable condition. Never loosen a connection or
attempt to remove a part until gas pressure has been relieved.
Under pressure, gas can dangerously propel a loose part.
e. Before transporting a cylinder that is not secured on a cart
suitable for such transport, remove the regulator and recap
the cylinder.
f. Stand on one side of outlet of cylinder valve or regulator when
opening valve.
INTRODUCTION
INSTALLATION
This manual provides installation, operation, and service information for
the Model 308 Series electrically heated single-stage regulators. These
regulators have metal diaphragms which make them ideal for general
laboratory uses as well as pressure control devices for critical analytical
procedures. Generally, these regulators are used for handling both
Carbon Dioxide and Nitrous Oxide.
Either regulator is used for nonsiphon cylinder service. It is a regulation
device used in furnace blanketing, purging, shrink fitting, atomic
absorption and other applications requiring high, steadily-maintained
gas ows.
The Regulator has a 115-volt 1.3 amp or 220-volt .65 amp heating system
consisting of three 50-watt heating cartridges, a primary thermostat
to provide automatic temperature control, and a secondary safety
thermostat cutout.
a. Observe the precautions listed in the SAFETY Section.
b. Connect the regulator to the cylinder valve outlet, checking
that the washer, if required, is in good condition and is in place.
c. This equipment has been supplied with a 3-wire cord. 220v
units will require the addition of a power plug.

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CAUTION
To guard against potential shock and re hazard: Always use a
grounded plug and protect the circuit with a suitable fuse or circuit
breaker.
d. Plug the regulator line cord into a grounded receptacle. The
heaters draw a total load of 150 watts.
e. Connect downstream equipment hose to the outlet. Slightly
open equipment gas valve. Then slowly open cylinder valve
and purge line to discharge contaminants. Close equipment
valve several seconds after pure gas starts to flow from
equipment. Open cylinder valve fully and the required gas
ow is ready for use.
f. Close the cylinder valve and unplug the line cord from the
supply receptacle whenever the regulator is not in use.
g. Before making any electrical connections test all pressure
connections for leaks by applying an approved leak detected
solution.
OPERATION
To Adjust Flow Rate or Pressure
a. With gas owing at downstream end, slowly turn regulator
adjusting screw clockwise until desired pressure is shown on
operating gauge.
b. To reduce flow rate or pressure, turn adjusting screw
counterclockwise while allowing gas to ow from downstream
valve.
To Shut Down
a. Close cylinder valve.
b. Open downstream valve to drain lines.
c. Close downstream valve, and unplug the line cord.

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General
Aunit which is not functioning properly should not be used until all
required repairs have been completed and the unit has been tested to
ascertain that it is in proper operating order.
IMPORTANT
Checking or repair of this equipment, limited to replacement of
nonrpessurized external parts such as electrical components,
may ordinarily be undertaken by a competent individual having
experience in the maintenance and repair of equipment of this
nature. No such checking or repair should ever be undertaken or
attempted by anyone not having such qualications.
Shut down and unplug and disconnect Regulator fromcylinder or
pipeline before starting maintenance or repair.
Handle the Regulator carefully. Observe “IMPORTANT” above,
“User Responsibilities” section of manual (page 2) and applicable
precautions in SAFETY Section at front. In case of malfunction,
return Regulator for repair to the nearest CONCOA designated repair
location, as special tools, tests, and techniques are required.
CAUTION
It is recommended that all servicing be done by a service facility authorized
by CONCOA. Contact the CONCOA Customer Service Department in
Virginia Beach or the nearest CONCOA District Sales Oce for assistance.
If so advised, the unit should be sent to a service facility authorized by
CONCOA, adequately packaged, in the original shipping container if
possible, and shipped prepaid, with a statement of observed deciency.
The gas service that the equipment has been subjected to must be clearly
identied. All equipment must be purged before shipment to protect the
transporter and service personnel. The purging is especially important
if the equipment has been in hazardous or corrosive gas service. Return
trip transportation charges are to be paid by Buyer. In all cases other than
where warranty is applicable, repairs will be made at current list price for
the replacement part(s) plus a reasonable labor charge.
SERVICE

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Good Maintenance Practice
a. When using a vise or wrench, use only enough pressure to
hold the Regulator. Be careful not to scar or distort the body,
threads, or other parts.
b. Clean parts to remove dirt before reassembling (GENERAL
SAFETY PRACTICES, step d).
c. Test Regulator for leaks before using. Test regularly between
uses.
WHITE
BLACK
WHITE
BLACK
(115 V Domestic) BLACK
WIRING DIAGRAM
or
BROWN
or
GREEN/YELLOW
BLUE
or
SecondaryPrimary
Relief
Valve
INLET
OUTLET
ThermostatThermostat
WHITE WHITEWHITE
BLACK
GREEN or GREEN/YELLOW
BLACK
(115 V Domestic) (115 V Domestic)
(220 V European) (220 V European)
(220 V European)
Heater 1 of 3
Heater 2 of 3
Heater 3 of 3
VIEW OF HEATERS
& THERMOSTATS
INSTALLED IN BACK
OF REGULATOR
Gauge
115 V Power Cord
Regulator
(Domestic):
220 V Power Cord
Customer Must Provide
(European):
Appropriate Plug
①
②
③
①②
③
③
③
③
③
④Ground
Screw ④
④
③③③
①
②
GREEN or
GREEN/YELLOW
BLACK or
BROWN
WHITE or
BLUE
Plug is Included with

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Trouble Shooting
Symptoms
1. With no flow through the
system (downstream valves
closed and cylinder valve
open) working pressure
increasing steadily above set
pressure (use test gauge if
necessary).
2. Gas leakage from spring case
Gauge:
3. Gas leakage from gauge
4. Gauge does not return to zero
5. Gauge does not consistently
repeat reading
6. Gas leakage from any joint
7. Excessive drop in working
pressure
8. Gas leakage from relief valve
9. Inadequate heat
10. No heat
Probable Cause
1. Leak across the seat
2. Loose case or damaged
diaphragm
3. Damaged gauge
4. Damaged gauge
5. Damaged gauge
6. Damaged or loose connection
(ttings, gauges, or spring case)
7. Worn or sticking internal parts;
Internal flow obstruction;
Dirty inlet gland lter; Cylinder
or upstream valve not fully
opened.
8. Faulty valve; Seat leak
9. One or two heaters burned out*
10. Lack of power; Faulty
thermostat(s)
*Check resistance across power leads (Figure1). With all heaters
functioning, resistance should be 88 ohms. With two heaters functioning,
resistance should be 132 ohms. And with only one heater functioning,
resistance should be 256 ohms.

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Warranty Information
This equipment is sold by CONTROLS CORPORATION OF AMERICA under the warranties
set forth in the following paragraphs. Such warranties are extended only with respect to
the purchase of this equipment directly from CONTROLS CORPORATION OF AMERICA
or its Authorized Distributors as new merchandise and are extended to the rst Buyer
thereof other than for the purpose of resale.
For a period of one (1) year from the date of original delivery (90 days in corrosive service)
to Buyer or to Buyer’s order, this equipment is warrantied to be free from functional de-
fects in materials and workmanship and to conform to the description of this equipment
contained in this manual and any accompanying labels and/or inserts, provided that
the same is properly operated under conditions of normal use and that regular periodic
maintenance and service is performed or replacements made in accordance with the
instructions provided.The foregoing warranties shall not apply if the equipment has been
repaired: other than by CONTROLS CORPORATION OF AMERICA or a designated service
facility or in accordance with written instructions provided by CONTROLS CORPORATION
OF AMERICA, or altered by anyone other than CONTROLS CORPORATION OF AMERICA,
or if the equipment has been subject to abuse, misuse, negligence or accident.
CONTROLS CORPORATION OF AMERICA’s sole and exclusive obligation and Buyer’s sole
and exclusive remedy under the above warranties is limited to repairing or replacing, free
of charge, at CONTROLS CORPORATION OF AMERICA’s option, the equipment or part,
which is reported to its Authorized Distributor from whom purchased, and which if so
advised, is returned with a statement of the observed deciency, and proof of purchase
of equipment or part not later than seven (7) days after the expiration date of the appli-
cable warranty, to the nearest designated service facility during normal business hours,
transportation charges prepaid, and which upon examination, is found not to comply
with the above warranties. Return trip transportation charges for the equipment or part
shall be paid by Buyer.
CONTROLS CORPORATION OF AMERICA SHALL NOT BE OTHERWISE LIABLE FOR
ANY DAMAGES INCLUDING BUT NOT LIMITEDTO: INCIDENTAL DAMAGES, CONSE
QUENTIAL DAMAGES,OR SPECIAL DAMAGES,WHETHER SUCH DAMAGES RESULT
FROM NEGLIGENCE, BREACH OF WARRANTY OR OTHERWISE.
THERE ARE NO EXPRESS OR IMPLIED WARRANTIES WHICH EXTEND BEYOND THE
WARRANTIES HEREINABOVE SET FORTH. CONTROLS CORPORATION OF AMERICA
MAKES NO WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE WITH RESPECT TO THE EQUIPMENT OR PARTS THEREOF.

Certified ISO 9001
ADI 3005-D
Controls Corporation of America
1501 Harpers Road Virginia Beach, VA 23454
To Order Call 1-800-225-0473 or 757-422-8330 • Fax [phone]
www.concoa.com