4474i
ORDINANCE NO
�N 0 RDINAN01 PRESCRIBING PAOVIDING INSTALLATION
PERMITCODE OR.THE INSTALLAT ON OF
IkRIGERATING SYSTEMS AND R
SAdE,FIXING THE FEES EOF CHARGED
CODETHEREFOR
FORAND
OTHERIPURPOSES.
PENALLY FOR THE VIOLA TION
BE IT ORDAINED BY THE'CITY COUNCIL OF THE CITY OF LITTLE ROOK&
Section 1. PERMIT AND FEE. Before any multiple refrigerating
stem as defined. in this section, shall hereafter be installed
n any building in the City of Little R ek, a permit for such
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inspector. The
installation shall be secured from the buAdobiOg
fee for such permit shall be computed upon the basis of One ($1000)
Dollar for each evaporator to be installed in the system.
Section 2. RE- INSPECTION. The fee for re- inspection, after
a certificate of approval has been issued, shal be Two X2.00
Dollars. Such re- inspection shall be made by the irANIMMg inspector
or one of his assistants, whenever tkU�llation shall become
a test
defective and, in_the opinion of the b� inspector,,
"Is necessary.
Section 3. MULTIPLE REFRIGERATING SYSTEM DEFINED. The term
"Multiple Refrigerating System" as used in this section shall
mean and include all mechanical refrigeration systems (except
public ice plants or cold storage plants installed under the
supervision of a licensed engineer and maintained by a competent
licensed. engineer ) in which the refrigerant used in the system
is distributed from a common source to two or more separate
babinttel each containing one or more evaporators.
Section 4. INSPECTIONS AND APPROVALS. (a) All multiple
refrigerating systems..as defined above shall be of a pattern and
manufacture approved by the-National Board of Fire Underwtitera,
and bearing their label of approval. (b) No multiple system shall
be placed in operation until the complete installation has been
tested by the'insta.11er in the presence of the authority enforcing
this code. A certificate of approval shall be posted on the
premises where the system is installed. The test shall be made
by the contractor or person installing or repairing the system
who shall furnish all instruments and material necessary to make
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such tests in accordance with this section of the code. Tests shall
i).clude a vacuum test of the complete piping system, preferably
with tj&e evaporator installed but valves thereon may be closed to
prevent withdrawal of the refrigerant. Under this test a vacuum
of twenty inches of mercury shall be placed upon the system and
shall be held for a period of twenty minutes, with no detectable
drop, after the pump has been stopped. After the vacuum test, the
system of piping shall be tested by application of pressure as
indicated in the table below.
Refrigerant used
Carbon Dioxide
Amonia
Methyl Chloride
Sulphur Dioxide
Iso- butane
Butane
Ethyl Chloride
Methylane Chloride
TES`" PRESSURES
High Side Part
lbs. per sq. inch
1500
300
190
135
130
75
50
15
Low Side Part
lbs per sq.inch
750
150
90
50
50
35
25
15
Carbon dioxide or nitrogen shall be used for test pressures.
Section 5. CAPACITY LIMITATION.(Ji) No multiple system shall
contain more than 100 pounds of refrigerant. (b) Compressors shall
not be located under stairways or near dumb waiter or elevator
shafts; shall be located as nearly beneath the riser as practicable;
shall preferably not be in a room containing storage of combustable
material but shall in any case be located at least ten (10) feet
from such storage; shall be located in an accessible part of the
building with adequate lighting facility provided; and shall be
protected against mechanical injury by a noneombustable partition,
or by heavy metal netting secured to two by four inch wooden studding
or two metal posts.
Section 6. REFRIGERANT LINES. Refrigerant lines shall be in- i.
stalled in accordance with either of the following methods; (a)
Standard pipe for refrigerants requiring test pressures of three
hundred (300) pounds or less and extra heavy pipe for test pressures
in excess of three hundred pounds per square inch. (b) Approved
annealed seamless copper tubing of not less than .034 inch wall
thickness for diameters not exceeding 5 /9th inch, of corresponding
(greater wall thiekn @ss for la:r-er diameter. 'There this method is
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such tests in accordance with this section of the code. Tests shall
i).clude a vacuum test of the complete piping system, preferably
with tj&e evaporator installed but valves thereon may be closed to
prevent withdrawal of the refrigerant. Under this test a vacuum
of twenty inches of mercury shall be placed upon the system and
shall be held for a period of twenty minutes, with no detectable
drop, after the pump has been stopped. After the vacuum test, the
system of piping shall be tested by application of pressure as
indicated in the table below.
Refrigerant used
Carbon Dioxide
Amonia
Methyl Chloride
Sulphur Dioxide
Iso- butane
Butane
Ethyl Chloride
Methylane Chloride
TES`" PRESSURES
High Side Part
lbs. per sq. inch
1500
300
190
135
130
75
50
15
Low Side Part
lbs per sq.inch
750
150
90
50
50
35
25
15
Carbon dioxide or nitrogen shall be used for test pressures.
Section 5. CAPACITY LIMITATION.(Ji) No multiple system shall
contain more than 100 pounds of refrigerant. (b) Compressors shall
not be located under stairways or near dumb waiter or elevator
shafts; shall be located as nearly beneath the riser as practicable;
shall preferably not be in a room containing storage of combustable
material but shall in any case be located at least ten (10) feet
from such storage; shall be located in an accessible part of the
building with adequate lighting facility provided; and shall be
protected against mechanical injury by a noneombustable partition,
or by heavy metal netting secured to two by four inch wooden studding
or two metal posts.
Section 6. REFRIGERANT LINES. Refrigerant lines shall be in- i.
stalled in accordance with either of the following methods; (a)
Standard pipe for refrigerants requiring test pressures of three
hundred (300) pounds or less and extra heavy pipe for test pressures
in excess of three hundred pounds per square inch. (b) Approved
annealed seamless copper tubing of not less than .034 inch wall
thickness for diameters not exceeding 5 /9th inch, of corresponding
(greater wall thiekn @ss for la:r-er diameter. 'There this method is
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employed tubing shall be protected from mechanical injury as follows;
Flom the manifolds at the compressor, the copper tubing shall be
instalied in iron or steel pipes or other metal inclosures as
specified below, with suitable metal boxes for the manifold and for
all other valves except those at the evaporator. Flexible metal
inclosures may be used at bends or at terminals if not exceeding
six feet in length and rigidly fastened to connecting pipe and/or
valve boxes. Each run of pipe shall be.sealed or plugged at each
junotion box inlet with a material not effected by moisture or the
temperature of the line. Inclosures shall be rigidly secured to
the walls or other support. Tubing shall be independently supported
in such a manner as to prevent excessive vibration and strains
at joints and connections. Valves, surface connections and joints
,in tubing shall be rigidly secured in suitable metal boxes at
accessible points.
Section 7. JOINTS. (a) Pipe joints shall have standard pipe
eads;and shall be made up with material suited to the refrigerant
employed. (b) If flanged fittings are used for pipe connections
they shall be of recess gasket type. (c) All joints in copper tubing
shall be of sweated types, except that flared joints may be used for
tubing not more than 5 /8th inch in diameter and where the required
test pressure does not exceed 180 pounds. (d) All joints in tubing
shall be accessible.
Section S. VALVES AND FITTINGS (a) All valves andifittings on
the high pressure side of the system shall be of the forged type;
for castings of semi -steel may be used. (b) Shut -off valves shall be
linstalled at the following locations; at each surface outlet in
pressure and return lines, and in each riser or manifold connection
at or near the compressor. These valves shall be fitted with a hand
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wheel or other means of ready operation as an inteal part thereof.
(c) Valves in service connections shall be located outside of the
refrigerating; unit and at such distance above the floor as will
;provide ready accessibility. (d) Shut -off valve shall be installed
in both connections to every evaporator in such a manner as to
rmit the removal of the evaporator with valves attached.
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Section 9. SERVICE CONNECTIONS (a) Not more than a single
tenant shall be supplied from an outlet box on a main riser. Such
outlet &box shall be located within the premises of the tenant served
and so arranged as to be accessible at all times. (b) No outlet
or junction box shall be permitted in any hallway, stairway or
vertical shaft not cut off at each story. Elevator, dumb waiter
or other shaft containing moving objects shall not be used for
outlet or junction boxes, nor for tubing or piping carrying refriger-
ant. (c) Every refrigerator or unit containing an evaporator shall
be rigidly secured in place.
Section 10. SAFETY FEATURES (a) Each compressor drive shall
e provided with a device which will automatically stop the com-
pressor at a pressure not in excess of the test pressure as
specified by section #3. This shall not apply to air - cooled machines
or to water - cooled machines having a liquid receiver capacity of
ess than twelve (12) pounds of refrigerant, and which are so
r1ae not to permit a pressure in excess of the test pressure.
b) Where amonia or carbon dioxide is used every high pressure
ide or liquid receiver which can be shut off shall be equipped
ith a pressure relief device discharging into thellow pressure
de of the system or to the outside of the building. Where the
elief from the high pressure side is into the low pressure side
he latter shall be protected by a relief device, discharging to the
utside of the building or to a suitable absorber. (e) Reftigerant
iping or inclosure carrying refrigerant lines shall be conspicuously
narked or labeled so as to plainly.indicate its contents. Such marking
hall consist of a suitable metal tag of aluminum or copper with
ailed or pressed lettering of about one -half inch in height stating
he.name of the refrigerant contained in the piping or conduit and the
Ord "Line" underneath or beside the name of the refrigerant, or a
ag equal in effect and durability as may be approved by the
nspector. A sufficient number of tags shall be placed on risers and
a.terals as will readily identify and distinguish such pipings or
onduits from other piping used in the building. All such refrigerant
ines shall be kept a sufficient distance from other piping so as
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not to be interfered with through repairs to the latter.
Section 11. INSTRUCTION CARD AND INSPECTION CERTIFICATE. The
contractor or person installing any multiple refrigerating system
shall furnish an instruction card giving a diagram of*the location
of compressor and refrigerators together with the lines connecting
same and all control valves in such lines. The lines and valves shall
be tagged for reference, as approved by the �)`nspector, desi�
nating the apartment or location to which the line leads and which
valve controls such lines. The card shall contain printed instructi
as to the care and maintenance of the system and what to do in an
emergency. It shall state the name of the refrigerant used in the
system, the amount by weight in Dounds contained in same, and the
maximum pressure recommended by the manufacturer. Upon completion
of the s stem and after a successful test has been made and witnesses
by the inspector, or one of his assistants, and duly ap-
proved by him, and after the plant has 1pen installed according
to th6— ovisions of this section, the . inspector shall
issue to the installer a certificate of inspection and no such
multiple refrigerating system shall be used or nut in service until
such certificate of inspection has been issued. Whenever any existing
multiple refrigerating system or any new system herejaifteg installed,
shall become defective, and upon inspection by the inspector
shall be declared dangerous to use, and he shall order its use
discontinued and the certificate of inspection previously issued s
automatically become void, and no such multiple refrigerating system
shall be used until proper rena.irs have been made and test applied a
until a new certificate of inspection has been issued by thAuAk
inspector. The certificate of inspection shall be properly dated,
giving the street address of the building where the refrigerating
system is located, the location of the compressor in the building,
the name of the manufacturer, the refrigerant used, the amount
in pounds contained in the system, the maximum pressure to be
carried, and such other information as may be deemed necessary by
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#,he speetor. The card of instruction and the certificate
of inWection shall be placed under a sheet of glass and should be
properly framed for preservation and it shall be posted at a
point convenient to the compressor.
Section 12. Before the City Electrician or any of his as-
sistants shall issue a final inspection certificate on any building
containing a multi- a refrigerating system, the certificate of
inspection of the spector must have been issued upon
such refrigerating system.
Section 13. PENALTY. Any person, firm or corporation violati
any of the provisions of this ordinance shall be deemed guilty of
a misdemeanor and upon conviction therefor shall be /fined in any
sum not less than Twenty Five ($25) nor more than Five Hundred
($500) Dollars.
.Section 14. This ordinance shall be known as the Installations
Code and shall take effect and be in force from and after its
passage.
Passed: August 20, 1929•
Attest: Appro
ity Clerk.
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