Page 126 - 2018_IMC

REFRIGERATION

1106.5.2 Emergency ventilation system. An emergency 1107.2 Piping location. Refrigerant piping that crosses an
ventilation system shall be provided at the minimum open space that affords passageway in any building shall be
exhaust rate specified in ASHRAE 15 or Table 1106.5.2. not less than 7 feet 3 inches (2210 mm) above the floor unless
Shutdown of the emergency ventilation system shall be by the piping is located against the ceiling of such space. Refrig-
manual means. erant piping shall not be placed in any of the following:
TABLE 1106.5.2 1. A fire-resistance-rated exit access corridor.
MINIMUM EXHAUST RATES
2. An interior exit stairway.
REFRIGERANT Q(m/sec) Q(cfm)
3. An interior exit ramp.
R32 15.4 32,600
4. An exit passageway.
R143 13.6 28,700
5. An elevator, dumbwaiter or other shaft containing a
R444A 6.46 13,700
moving object.
R444B 10.6 22,400
6. A shaft that has one or more openings into a fire-resis-
R445A 7.83 16,600
tance-rated exit access corridor, interior exit stairway or
R446A 23.9 50,700
ramp or exit passageway.
R447A 23.8 50,400
1107.2.1 Piping in concrete floors. Refrigerant piping
R451A 7.04 15,000 installed in concrete floors shall be encased in pipe ducts.
R451B 7.05 15,000 The piping shall be isolated and supported to prevent dam-
R1234yf 7.80 16,600 aging vibration, stress and corrosion.
R1234ze(E) 5.92 12,600 1107.2.2 Refrigerant penetrations. Refrigerant piping
shall not penetrate floors, ceilings or roofs.
1106.5.3 Emergency ventilation system discharge. The Exceptions:
emergency ventilation system point of discharge to the
atmosphere shall be located outside of the structure at not 1. Penetrations connecting the basement and the
less than 15 feet (4572 mm) above the adjoining grade first floor.
level and not less than 20 feet (6096 mm) from any win- 2. Penetrations connecting the top floor and a
dow, ventilation opening or exit. machinery penthouse or roof installation.
[F] 1106.6 Remote controls. Remote control of the mechani- 3. Penetrations connecting adjacent floors served by
cal equipment and appliances located in the machinery room the refrigeration system.
shall comply with Sections 1106.6.1 and 1106.6.2.
4. Penetrations by piping in a direct system where
[F] 1106.6.1 Refrigeration system emergency shutoff. A the refrigerant quantity does not exceed Table
clearly identified switch of the break-glass type or with an 1103.1 for the smallest occupied space through
approved tamper-resistant cover shall provide off-only which the piping passes.
control of refrigerant compressors, refrigerant pumps, and
normally closed, automatic refrigerant valves located in 5. In other than industrial occupancies and where
the machinery room. Additionally, this equipment shall be the refrigerant quantity exceeds Table 1103.1 for
automatically shut off whenever the refrigerant vapor con- the smallest space, penetrations for piping that
centration in the machinery room exceeds the vapor detec- connects separate pieces of equipment that are
tor’s upper detection limit or 25 percent of the LEL, either:
whichever is lower. 5.1. Enclosed by an approved gas-tight,
[F] 1106.6.2 Ventilation system. A clearly identified fire-resistive duct or shaft with open-
switch of the break-glass type or with an approved tamper- ings to those floors served by the refrig-
resistant cover shall provide on-only control of the eration system.
machinery room ventilation fans. 5.2. Located on the exterior of the building
[F] 1106.7 Emergency signs and labels. Refrigeration units where vented to the outdoors or to the
and systems shall be provided with approved emergency space served by the system and not used
signs, charts, and labels in accordance with the International as an air shaft, closed court or similar
Fire Code. space.
1107.3 Pipe enclosures. Rigid or flexible metal enclosures or
SECTION 1107 pipe ducts shall be provided for soft, annealed copper tubing
REFRIGERANT PIPING and used for refrigerant piping erected on the premises and
containing other than Group A1 or B1 refrigerants. Enclo-
1107.1 General. The design of refrigerant piping shall be in sures shall not be required for connections between condens-
accordance with ASME B31.5. Refrigerant piping shall be ing units and the nearest riser box(es), provided such
installed, tested and placed in operation in accordance with connections do not exceed 6 feet (1829 mm) in length.
this chapter.
1107.4 Condensation. Refrigerating piping and fittings,
brine piping and fittings that, during normal operation, will

2018 INTERNATIONAL MECHANICAL CODE  109
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