ZONES
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 zone 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 AND 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. Water feed 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. All piping used
to interface with the nozzles must not exceed 5/8”-
11/16” O.D. when NORTEC supplied saddle clamps
are used. If other than NORTEC supplied saddle
clamps are used, then size the fittings to the pipe.
CLEANING
Clean out 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 very
critical, failure to maintain clean lines may void the
warranty.
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).
- 6 -
Polytube
AFE Nozzle
Wall Support Bracket
Polytube
Saddle
Clamp
Saddle Clamp
Mounting Holes
For 1/4" Lag Bolts
Lag Bolts
(Supplied By Others)
Figure #4
Nozzle To Bracket Interface
Primary Air Pressure Control Section
Primary Water Pressure Control Section
Figure #3
Water and Air Line Pressure Control
