UpCodes logo
// CODE SNIPPET

Section 1106 Machinery Room, Special Requirements

Go To Full Code Chapter
1106.1 General
Where required by Section 1104.2, the machinery room shall meet the requirements of this section in addition to the requirements of Section 1105.
1106.2 Elevated Temperature
There shall not be an open flame-producing device or continuously operating hot surface over 800°F (427°C) permanently installed in the room.
1106.3 Flammable Refrigerants
Where refrigerants of Groups A2, A3, B2 and B3 are used, the machinery room shall conform to the Class I, Division 2, hazardous location classification requirements of NFPA 70.
Exception: Machinery rooms for systems containing Group A2L refrigerants that are provided with ventilation in accordance with Section 1106.4.
1106.4 Special Requirements for Group A2L Refrigerant Machinery Rooms
Machinery rooms with systems containing Group A2L refrigerants that do not conform to the Class I, Division 2, hazardous location electrical requirements of NFPA 70, as permitted by the exception to Section 1106.3, shall comply with Sections 1106.4.1 through 1106.4.3.
Exception: Machinery rooms conforming to the Class I, Division 2, hazardous location classification requirements of NFPA 70 are not required to comply with Sections 1106.4.1 and 1106.4.2.
[F] 1106.4.1 Ventilation System Activation
Ventilation shall be activated by the refrigerant detection system in the machinery room. Refrigerant detection systems shall be in accordance with Section 608.9 of the International Fire Code and all of the following:
  1. The detectors shall activate at or below a refrigerant concentration of 25 percent of the LFL.
  2. Upon activation, the detection system shall activate the emergency ventilation system required by Section 1106.4.2.
  3. The detection, signaling and control circuits shall be supervised.
1106.4.2 Emergency Ventilation System
An emergency ventilation system shall be provided at the minimum exhaust rate specified in ASHRAE 15 or Table 1106.4.2. Shutdown of the emergency ventilation system shall be by manual means.
TABLE 1106.4.2
MINIMUM EXHAUST RATES
REFRIGERANT Q(m/sec) Q(cfm)
R32 15.4 32,600
R143 13.6 28,700
R444A 6.46 13,700
R444B 10.6 22,400
R445A 7.83 16,600
R446A 23.9 50,700
R447A 23.8 50,400
R451A 7.04 15,000
R451B 7.05 15,000
R1234yf 7.80 16,600
R1234ze(E) 5.92 12,600
1106.4.3 Emergency Ventilation System Discharge
The emergency ventilation system point of discharge to the atmosphere shall be located outside of the structure at not less than 15 feet (4572 mm) above the adjoining grade level and not less than 20 feet (6096 mm) from any window, ventilation opening or exit.
[F] 1106.5 Remote Controls
Remote control of the mechanical equipment and appliances located in the machinery room shall comply with Sections 1106.5.1 and 1106.5.2.
[F] 1106.5.1 Refrigeration System Emergency Shutoff
A clearly identified switch of the break-glass type or with an approved tamper-resistant cover shall provide off-only control of refrigerant compressors, refrigerant pumps, and normally closed, automatic refrigerant valves located in the machinery room. Additionally, this equipment shall be automatically shut off whenever the refrigerant vapor concentration in the machinery room exceeds the vapor detector's upper detection limit or 25 percent of the LEL, whichever is lower.
[F] 1106.5.2 Ventilation System
A clearly identified switch of the break-glass type or with an approved tamper-resistant cover shall provide on-only control of the machinery room ventilation fans.
[F] 1106.6 Emergency Signs and Labels
Refrigeration units and systems shall be provided with approved emergency signs, charts, and labels in accordance with the International Fire Code.

Related Code Sections

Section 1106 Refrigeration, Machinery Room, Special Requirements
Where required by Section 1104.2, the machinery room shall meet the requirements of this section in addition to the requirements of Section 1105 ...
Section 1106 Refrigeration, Machinery Room, Special Requirements
Where required by Section 1104.2, the machinery room shall meet the requirements of this section in addition to the requirements of Section 1105 ...
Section 1106 Refrigeration, Machinery Room, Special Requirements
Where required by Section 1104.2, the machinery room shall meet the requirements of this section in addition to the requirements of Section 1105 ...
1106.1 Refrigeration, General
Where required by Section 1104.2, the machinery room shall meet the requirements of this section in addition to the requirements of Section 1105 ...
1106.5 Refrigeration, Remote Controls
Remote control of the mechanical equipment and appliances located in the machinery room shall comply with Sections 1106.5.1 and 1106.5.2 ...