2.ZONES
A.INTRODUCTION
(1)It may be necessary to break down the space to be humidified into zones. Limitation of the control devices and maximum run of feed piping may indicate the need for multiple zones. Refer to the Engineering manual for detailed limitation of components. Up to four zones can be controlled from one control panel, additional zones can be added with the use of a pilot air regulator acting as a volume booster for the pilot signal. See Figure 2 Multiple Zone Layout.
B.SUPPLY FEED LINES
(1)Main supply lines connecting to the system must be sized to handle system flow volumes and pressures. Connections to each zone should have an isolation valve installed by using a NORTEC supplied primary pressure control section as illustrated in Figure 3 Water and Air Line Pressure Control. Primary air pressure feed to each zone should not exceed 90 psig. Water feed pressure is not to exceed 25 psig for AFE, Mini and Octo hardware. Supply water pressure is not to exceed 65 psig for AFD systems.
(2)Both water and air lines must be installed as per the mechanical drawings using standard plumbing joining techniques. The spans must not be greater than 5 feet without a supporting bracket. For long runs of piping, expansion joints may be needed and these joints must meet local building codes. When using Nortec supplied saddle clamps, the maximum line size for supplying to nozzles is 11/16” O.D. If saddle clamps by others are used, please size fittings to match the pipe.
C.CLEANING
(1)Manual valves must be installed at the ends of all lines to facilitate cleaning and drainage of lines. Cleaning is done by temporarily connecting the pipes to a compressed air source at one end of the pipe. The other end of the pipe must not be connected to any equipment but be free to allow the egress of foreign matter. Care must be taken to protect personnel, animals, machines or other sensitive material from the potentially hazardous and contaminating matter, which will exit at high speed from the opening.
NOTE
Cleaning of the lines of all foreign material prior to connecting any system component is critical, failure to maintain clean lines may void the warranty.
D.MOUNTING OF NOZZLES
(1)Each supplied NORTEC nozzle has a 3/8” NC 16 threaded port on the under side of the nozzle which is used to fasten the nozzle to a mounting bracket, as illustrated in Figure 4 Nozzle To Bracket Interface or Figure 5 AFE Nozzle Ceiling Mounting. If other than NORTEC supplied mounting hardware is to be used, ensure correct bolt and thread size is used. Nozzles can be mounted in any elevation angle as water throughput capacity is not affected by this orientation. However, AFE nozzle capacity is sensitive to vertical height differences to the vacuum valve. The maximum nozzle installation height allowable above the water supply line is 12” (30 cm).
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