GAS SHUT-OFF VALVE INSULATION

1. Mechanical Gas Shut-Off Valve Installation

The Model MCH3/NMCH3 Control Head is used to operate the mechanical gas shut-off valve. This valve is located in the fuel gas supply line to the cooking appliance(s). The  valve body has an arrow which indicates direction of gas flow through the valve. The gas shut-off valve is spring loaded and requires five pound of force to hold it open. This force is supplied by a 1/16 in. (.2 cm) diameter stainless steel cable that is connected to the control head.

After the valve is installed in the gas line, 1/2 in. (1.3 cm) conduit must be run from the top center knockout of the gas valve box to the lower right-hand knockout in the control head. A Pyro-Chem Kitchen Knight II corner pulley is used wherever a change in conduit direction is required. 

Gas Valve Cable Run Limitations When Used with Model MCH3, EN-MCU3, and NMCH3 Control Heads and CBP-1, SBP-1 and WBP-1 Pulley Elbows

Maximum length of cable:                                        100 ft. (30.5 m)
Maximum # of pulleys:                                              30 

Remove the gas valve cover and thread the stainless steel cable through conduit back to the control head. Thread the cable through the hole in the gas valve ratchet wheel. the line must then be crimped, and the crimp positioned inside the center of the ratchet wheel.

NOTE: Crimps must always be used in conjunction with two (2) cable lengths. Loops are the accepted method of connecting the cable to mechanical components. The Crimp must never be used on a single cable.

At the gas valve, loop the cable through the valve stem and secure it with the crimp provided )see Figure 4-18).

CAUTION: Do not over tighten gas valve. Over tightening the gas valve may cause the valve to not close completely, thus not fully shutting the fuel supply off to the appliance.

The gas valve line can now be put into a set position by applying tensions to the gas valve line. This is accomplished by using a 1/2 in. (1.27 cm) hex wrench on the gas valve ratchet wheel. The ratchet wheel will be ratcheted in a clockwise direction until the gas valve is fully open. See Instruction Sheet, Part No. 550571, included in gas valve assembly, for detailed information. Secure the gas valve cover plate to the gas valve box with the four (4) screws provided. The gas  valve line is now is a set position. See Figure 4-19.

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