A.
The International Mechanical Code, 2015 Edition, is hereby amended
as follows:
1.
101.1. Delete and insert in lieu thereof the following: Title.
These regulations shall be known as the "Mechanical Code of Jefferson
County, Missouri," hereinafter referred to as "this code."
2.
102.5. Delete entire section.
3.
106.3.1. Delete and insert in lieu thereof the following: Construction
documents. Construction documents, engineering calculations, diagrams
and other data shall be submitted in two (2) or more sets with each
application for a permit. The Code Official shall require construction
documents, computations and specifications to be prepared and designed
by a registered design professional. Where special conditions exist,
the Code Official is authorized to require additional construction
documents to be prepared by a registered design professional. Construction
documents shall be drawn to scale and shall be of sufficient clarity
to indicate the locations, nature and extent of the work proposed
and show in detail that the work conforms to the provisions of this
code. Construction documents for buildings more than two (2) stories
in height shall indicate where penetrations will be made for mechanical
systems, and the materials and methods for maintaining required structural
safety, fire resistance rating and fire blocking.
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Exception: The Code Official shall have the authority to waive
the submission of construction documents, calculations or other data
if the nature of the work applied for is such that reviewing of construction
documents is not necessary to determine compliance with this code.
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8.
301.3. Delete entire section.
9.
301.4. Delete entire section.
10.
301.5. Delete entire section.
11.
304.10. Delete and insert in lieu thereof the following: Ground
clearance. Equipment and appliances supported from the ground shall
be level and firmly supported on a concrete slab or other approved
material extending not less than two (2) inches (50.8 mm) above the
adjoining ground. Such support shall be in accordance with the manufacturer's
installation instructions. Appliances suspended from the floor shall
have a clearance of not less than six (6) inches (152 mm) from the
ground.
12.
306.4.1. Delete and insert in lieu thereof the following: Electrical
requirements. A luminaire controlled by a switch located at the required
passageway opening and a receptacle outlet shall be installed at or
near the appliance location in accordance with Chapter 39. Exposed
lamps shall be protected from damage by location or lamp guards.
Exception: Basements.
13.
307.2.3. Delete and insert in lieu thereof the following: Auxiliary
and secondary drain systems. In addition to the requirements of Section
M1411.3, a secondary drain or auxiliary drain pan shall be required
for each cooling or evaporator coil where damage to any building components
will occur as a result of overflow from the equipment drain pan or
stoppage in the condensate drain piping. Such piping shall maintain
a minimum horizontal slope in the direction of discharge or not less
than one-eighths-unit vertical in twelve (12) units' horizontal (one-percent
slope). Drain piping shall be not less than three-fourths-inch (19
mm) nominal pipe size. One of the following methods shall be used:
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1.
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An auxiliary drain pan with a separate drain shall be installed
under the coils on which condensation will occur. The auxiliary pan
drain shall discharge to a conspicuous point of disposal to alert
occupants in the event of a stoppage of the primary drain. The pan
shall have a minimum depth of one and one-half (1.5) inches (38 mm),
shall be not less than three (3) inches (76 mm) larger than the unit
or the coil dimensions in width and length and shall be constructed
of corrosion-resistant material. Galvanized sheet steel pans shall
have a minimum thickness of not less than (No. 26 Gage). Non-metallic
pans shall have a minimum thickness of not less than 0.0625 inch (1.6
mm).
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14.
501.3.2. Delete and insert in lieu thereof the following: Outdoor
discharge. The air removed by every mechanical exhaust system shall
be discharged to the outdoors in accordance with Section M1506.2.
Air shall not be exhausted into an attic, soffit, ridge vent or crawl
space.
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Exceptions:
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1.
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Whole-house ventilation-type attic fans that discharge into
the attic space of dwelling units having private attics shall be permitted.
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2.
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Bathroom exhaust may discharge to an attic gable vent or ventilated
soffit.
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15.
504.8.2. Delete and insert in lieu thereof the following: Duct
installation. Exhaust ducts shall be supported at intervals not to
exceed twelve (12) feet (3,658 mm) and shall be secured in place.
The insert end of the duct shall extend into the adjoining duct or
fitting in the direction of airflow. Exhaust duct joints shall be
sealed in accordance with Section M1601.4.1.
16.
504.8.4.1. Delete and insert in lieu thereof the following:
Specified length. The maximum length of the exhaust duct shall be
thirty-five (35) feet (10 688 mm) from the connection to the transition
duct from the dryer to the outlet terminal. Where fittings are used,
the maximum length of the exhaust duct shall be reduced in accordance
with Table M1502.4.5.1. The maximum length of the exhaust duct does
not include the transition duct.
Exception: The maximum developed length may be extended to fifty-five
(55) feet if clearly labeled cleanouts are provided within twelve
(12) inches of the second elbow, at every elbow thereafter, and at
least every fifteen (15) feet of developed length thereafter.
17.
505.2. Delete and insert in lieu thereof the following: Makeup
air required. Exhaust hood systems capable of exhausting in excess
of six hundred (600) cubic feet per minute shall be mechanically or
naturally provided with makeup air at a rate approximately equal to
the exhaust air rate. Such makeup air systems shall be equipped with
a means of closure and shall be automatically controlled to start
and operate simultaneously with the exhaust system.
18.
1203.9. Delete entire section.
19.
1203.12. Delete entire section.
20.
1203.3.5. Delete entire Section.
21.
1205.1.6. Delete entire Section.
22.
1210.1.1. Insert the following new section. Piping and tubing
materials standards. Ground-source heat-pump ground-loop pipe and
tubing shall conform to the standards listed in Table M2105.4. However,
polyvinyl chloride (PVC) and chlorinated polyvinyl chloride (CPVC)
shall not be used on geothermal ground loops both inside and underground.
23.
1210.10. Delete and insert in lieu thereof the following: Testing.
The assembled loop system shall be pressure tested with water at 45
psi for fifteen (15) minutes without observed leaks. Flow and pressure
loss testing shall be performed, and the actual flow rates and pressure
drops shall be compared to the calculated design values. If actual
flow rate or pressure drop values differ from calculated design values
by more than ten percent (10%) the cause shall be identified and corrective
action taken.
