2. Multiple Cylinder Installations.

A. Multiple Cylinder Actuation Using MCH3/ECH3/NMCH3 Control Head. 

The Model MCH3/ECH3/NMCH3 Control Head can be used to pneumatically actuate a maximum of three (3) agent cylinders. When a control head is used for multiple cylinder actuation, it cannot be mounted directly onto a cylinder valve. The control head must be installed remotely using a Model MB-P2 Control Head Mounting Bracket. The bracket must be anchored to the wall using bolts or lag screws.

  In order to actuate the agent cylinder(s) from a control head, a 1/4" NPT x 45⁰ 1/4" flare type fitting (conforming to SAE J513c) must be screwed into the base of the control head actuator. Pneumatic tubing is then used to connect the control head to the clave cap assembly of each agent cylinder valve. See Figure 4-3.

NOTE: Pneumatic tubing (copper) used for remote cylinder actuation shall have an outside diameter of 1/4" with a minimum wall thickness of 1/32". This is commonly known as refrigeration-type copper tubing. All tubing fittings shall be of the 1/4", 45⁰ flare type conforming to SAE J513c.

Compression type fittings are not acceptable.

A single Model MCH3/ECH3/NMCH3 Control Head can actuate three (3) agent cylinders with a maximum of eight (8) feet (2.4 m) of pneumatic tubing.

B. Multiple Cylinder Actuating Using Model PAC-10 Pneumatic Actuation Cylinder.

The Model PAC-10 Pneumatic Actuation Cylinder must be used if more than three (3) agent cylinders require simultaneous actuation. The Model PAC-10 must be used in conjunction with a Model MCH3/ECH3/NMCH3 Control Head. The control head is mounted on the Model PAC-10 valve assembly.

The Model PAC-10 is shipped complete with a mounting bracket. The bracket must be securely anchored to the wall using bolts or lag screws. The wall to which the bracket is attached must be sufficiently strong never be fastened to dry wall or similar material. If this type of wall is encountered, studs must be located and the bracket fastened to them. See Figure 4-4.

In order to actuate the agent cylinders from a Model PAC-10 Pneumatic Actuation Cylinder, a 3/4" NPT x 1/4" NPT bushing must be screwed into the pneumatic cylinders discharge port. A 1/4" x 45⁰ 1/4" flare type fitting (conforming to SAE J513c) must then be screwed into this bushing. Pneumatic tubing is then used to connect the PAC-10 pneumatic cylinder to the valve cap assembly of each agent cylinder valve. See figure 4-5.

NOTE: Pneumatic tubing (copper) used for remote cylinder actuation shall have an outside diameter of 1/4 in. (0.6 cm) with a minimum wall thickness of 1/32 in. (0.8 cm). This is commonly known as refrigeration-type copper tubing. All tubing fittings shall be of the 1/4", 45⁰ flare type conforming to SAE J531c.

Compression type fittings are not acceptable.

The Model PAC-10 pneumatic cylinder can actuate a maximum of ten (10) agent cylinders with a maximum of 100 feet (30.5 m) of pneumatic tubing.

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