Nortec AIRFOG Series - Manual (Page 11)

AirFog Installation Manual | 7
Zones
Introduction
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.
Supply Feed Lines
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.
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.
Cleaning
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.
A.
Mounting of Nozzles
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).
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.