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PIPE AND NOZZLE INSTALLATION
All pipe ends shall be thoroughly reamed after cutting and all oil and foreign matter removed from the pipe. It is recommended that the following procedures be followed:
1. Use Schedule 40 black iron, chrome-plated, or stainless steel pipe and fittings. Do not use hot-dipped galvanized iron pipe or fittings in the agent distribution piping.
2. Before assembling the pipe and fittings, make certain all ends are carefully reamed and blown clear of chips and scale. Inside of pipe and fittings must be free of oil and dirt.
3. The distribution piping and fitting connections, located in the hood or the protected area, must be selected with pipe tape. When applying pipe tape, start at the second male thread and wrap the tape (two turns maximum) clockwise around the threads, away from the pipe opening.
4. Do not over-tighten, but be sure the pipe is snug. do not back-off sections of pipe to make them fit better. If the pipe was cut too short, re-cut another pipe to the proper length.
CAUTION: Do not apply Teflon tape to cover or overlap the pipe opening, as the pipe and nozzles could become blocked and prevent the proper flow of agent. Do not use thread sealant or pipe joined compound..
All piping shall be securely fastened by means of pipe hangers and/or pipe straps. A union should be installed in the discharge piping, as close to the cylinder valve as possible to permit disconnecting and removal for inspection and service. Dry air or nitrogen should be blown through the discharge piping to remove chips and other debris prior to installation of nozzles.
Nozzles shall be installed in accordance with limitations describe in Chapter III of this manual. Blow-off caps are provided for each nozzle. These will prevent dirt and grease from clogging the nozzle.
SYSTEM CHECKOUT AFTER INSTALLATION
1. Model MCH3/NMCH3 Mechanical Control Head
Before putting the system into service, all components must be checked for proper operation. During this checkout, assure that the carbon dioxide pilot cartridge is not installed in the control head actuator. Remove the pull pin from the hole in the slide plate.
To check satisfactory operation of the control head, cut the terminal link or the "S" hook holding the link. This will relieve all tension on the fusible link line and operate the control head. The slide plate will have moved fully to the right. The gas valve cable will have been released, causing the gas valve to close. Any auxiliary equipment connected to the dry contacts of the solenoid monitor and/or the Miniature Switch in the control head will have operated.
If any of these events fail to occur, the problem must be investigated and repaired.
Repair the terminal link and put the fusible link line back into the set position. This is accomplished by using a 1/2 in. (1.27 cm) hex wrench on the fusible link line ratchet wheel. The ratchet wheel will be ratcheted in a clockwise direction until the spring plate makes contact with the top of the control head box.
Once the fusible link is set (note: Refer to page 4-4 through 4-6 for fusible link installations details), the control head can be placed in the set position. To set the control head, the slide plate is moved from right to left ensuring the bolt extending from the cam arm is in the slot provided in the slide plate to the left until the latching arms is in the locked position.
Once the control head is set, pull the pull handle on the remote pull station to assure that the control head operates. If the control head operates normally, the control head can be reset as described above. Insert the pull pin into the hole in the side plate above the latching arm. Replace the pull station handle, pull pin, and nylon tie.
Assure that the gas valve is fully open by ratcheting the gas valve ratchet valve.
CAUTION: Before screwing the carbon dioxide pilot cartridge into the actuator, ensure that the actuator has a Teflon O-ring installed.
Using a felt-stripped marker, write the date of installation on the carbon dioxide pilot cartridge. Screw the cartridge into the control head actuator until hand-tight. Never use a wrench to tighten the cartridge into the actuator.
Remove the pull pin from the hole in the slide plate and install the control head cover. Insert the pull pin through the local manual control handle and into a bushing. Secure the pull pin with nylon tie provided.
2. Model ECH3-24/120 Electrical Control Head.
Before putting the system into services, all components must be checked for proper operation. During this checkout, assure that the carbon dioxide pilot cartridge is not installed in the control head actuator. Remove the pull pin from the hole in the slide plate.
To check satisfactory operation of the control head, apply heat to the last thermal detector in series. This will operate the control head. The slide plate will have moved fully to the right. The indicator light on the solenoid monitor will go out. Any auxiliary equipment connected to the dry contacts of the solenoid monitor and/or the Miniature Switch in the control head will have operated.
If any of these events fail to occur, the problem must be investigated and repaired.
Once the thermal detector has cooled, the control head can be placed in the set position. To set the control head, the slide plate is moved from right to left, ensuring the bolt extending from the cam arms is in the slot provided in the slide plate. Continue moving the slide plate to the left until the latching arm is in the blocked position.
Once the control head is set, pull the pull handle on the remote pull station to assure that the control head operates. if the control head operates normally, the control head can be reset as described above. Insert the pull pin into the hole in the slide plate above the latching arm. Replace the pull station handle, pull pin, and nylon tie.
Energize the actuation/detection circuit by depressing the push button on the solenoid monitor.
CAUTION: Before screwing the carbon dioxide pilot cartridge into the actuator, ensure that the actuator has a Teflon O-ring installed.
Using a felt-tipped marker, write the date of installation on the carbon dioxide pilot cartridge. Screw the cartridge into the control head actuator until hand-tight. Never use a wrench to tighten the cartridge into the actuator.
Remove the pull pin from the hole in the slide plate and install he control head cover. Insert the pull pin through the local manual control handle and into the bushing. Secure the pull pin with the nylon tie provided.
