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1.
Provide self-contained microprocessor controlled steam generat-
ing humidifiers of the size(s) shown on plans as manufactured by
Carnes Company, Verona, WI.
2.
Carnes Humidifiers shall have the capacity to operate at
115, 208, 230, 277, 380, 415, 460 and 575 volt (or nominal value),
60 or 50 hz (cycle), single or 3 phase power. Specific combina-
tion of maximum output, voltage and phase for order application
determined by electrical data chart.
3.
The humidifier(s) shall be UL and cUL listed.
4.
The humidifier(s) shall have a total Color "True Touchscreen"
user interface. Features:
a. True Touchscreen navigation for all aspects of operation and
information access.
b. Cylinder life-counter (hours of operation. Found by accessing
Settings button.
c. With Fan Distribution Unit, there is a fan speed Slide Bar
control with CFM indication. Found by accessing Settings
button.
d. "Help" screen button.
e. "Service Required" button and indicator and corresponding
screen explaining service issues and possible troubleshooting
tips.
f. "Dim LCD" feature button.
g. "Humidistat Demand" indication button. Shows control
humidistat and high-limit humidistat.
h. "Settings button - where all operational values can be set.
i. "Setpoints" button - target steam output of the humidifier.
5.
Steam shall be generated from tap water or softened water (see
factory representative) in a factory sealed cylinder containing
electrodes. Cylinders shall not require setting of electrode spac-
ing, cleaning or maintenance and shall be of the disposable type.
6.
The humidifier(s) shall include an automatic drain cycle controlled
electronically to maximize energy efficiency. Drain cycle shall
adapt to variations in water conditions (high/low conductivity and
high/low hardness) and not require manual setting. There is also
a default setting for a pulsing drain action to assist in keeping
drain lines open.
7.
In the event of over-current, the humidifier shall signal that a
fault condition exists by message on touchscreen. Over-current
protection shall be resettable. Replacement type fuses are not
acceptable.
Option:
Humidifier(s) shall also include secondary magnetic
overload switches (circuit breakers) that shall be manually
resettable and shall be of the type that positively disconnects
power to the steam cylinder.
8.
Humidifier(s) shall include a door interlock safety switch to discon-
nect power to steam cylinder(s) when cabinet door is opened.
9.
The system shall include one steam distributor pipe for each
steam generating cylinder mounting in the duct as shown on the
plans. Steam distributing pipe(s) shall be of corrosion resistant
design (copper or stainless steel) and be designed to provide
uniform distribution over the entire length of the pipe.
Option:
Supply and install remote (or humidifier mounted) fan
distribution units to discharge steam directly into the conditioned
space.
Provide the following components:
a. Three 12VDC fans operated by circuit board.
b. Integral steam manifold trap.
b. Remote mounted on/off, proportional control humidistat.
Option:
When plans call for a specific short absorption
distance from dispersion system, a multi-tube Short Absorption
Manifold is available sized specifically to duct dimensions, with
horizontal stainless steel cross tubes and vertical headers.
10.
The system shall include flexible hose to connect the steam
cylinder(s) to the steam distributor pipe(s). A separate conden-
sate return line shall return condensate to the humidifier for
reuse to minimize consumption. If due to specific routing issues
or application of unit, condensate line can not run back to unit,
the line can go directly to the common drain, and the addition of
a "circle" or "U" trap will be required (see IOM). Long distances
from unit to common drain can be accommodated with accessory
option Water Pump (HXWA). Hard tubing can be used for Steam
Hose and Condensate Return to prevent sags, restrictions or
obstructions (see IOM), but it is recommended a minimum of 12
inches of flexible hose be used from unit and before distributor
pipe. We recommend a maximum distance of 30 feet from unit
to distributor pipe(s) or short absorption manifold and proper
routing and inclination of hoses and hard tubing be adhered to for
proper, overall consistent and dependable operation.
www.carnes.com
Humidifiers | Humidifier Specifications
11.
The humidifier(s) shall incorporate a 1" air gap on the fill water line
to prevent backflow. It is recommended that a drain air gap fitting
be installed by a non-Carnes contractor to prevent backflow of
water. Carnes offers an air gap fitting as a purchased option.
12.
The humidifier cabinet(s) shall be constructed of 20 gauge
steel with a stainless steel bottom pan, protected by a dipped
electrostatic baked enamel undercoat with multi spec textured top
coat with black accent architectural grade. The cabinet door shall
be hinged and provided with a lock and key. The main door is
also provided with a quick release pin for removal to provide easy
access to internals. The True Touchscreen Home Page will show
a digital LCD steam output meter calibrated in pounds of steam
per hour (kg of steam per hour selection is included as a built in
option), fill cycle, drain cycle and high water indicator lights will be
visible with the cabinet door closed.
13.
The humidifier(s) shall be controlled by a humidistat which
operates through the solid-state circuit board. Humidifier(s) shall
incorporate terminals for connection of humidistat, air flow switch
and high limit control humidistat.
Option:
Provide the following accessory controls:
a. Wall mounted humidistat, on/off control.
b. Wall mounted humidistat, w/ LCD combo (NEW).
c. Duct mounted humidistat, on/off control.
d. Duct mounted humidistat, proportional control.
e. Duct mounted humidistat w/digital humidity and temperature,
combo (NEW).
f. High limit duct mounted humidistat, on/off control.
g. High limit duct mounted humidistat, proportional control.
h. Pressure differential type air flow switch.
i. Paddle type air flow switch.
j. Wall or duct mounted temperature compensated, on/off
or proportional control, digital display humidistat.
14.
External Control Signals - All Carnes humidifiers will accept
external DDC control signals of 0-10 volt DC. Signal to modulate
the output of humidifier. Polarity must be observed and input
impedance is 20K ohms. If 4-20 mA signal is provided a 470 ohm,
1/4 watt resistor must be installed. Humidifiers will also accept
internal (BMS) building management system or (BAS) building
automation system signal.
15.
The fill water line shall include a strainer to remove sediment
from incoming water and a flow regulating control to automatically
compensate for water pressures from 20-120 psi.
16.
Humidifier(s) shall include a "Service Required" button with
indication light on the total "True Touchscreen" home page which
shall explain serivce issues and possible troubleshooting tips. The
light shall be visible with the cabinet door closed and terminals
shall be provided for remote signal. Terminals are also provided
to indicate normal operation to a remote location.
17.
Dedicated buttons with indicator lights on the home page of
the total "True Touchscreen" shall indicate status of the control
humidistat, high limit humidistat, air flow switch and door interlock
switch. Operation of fill solenoid, drain solenoid, power contac-
tor and high water sensor shall be shown after accessing the
"Component Activity" button on the home page of the total "True
Touchscreen".
18.
The humidifier(s) electronic circuit board shall include automatic
controls to compensate for varying water conditions without
changing cylinders or electrode spacing. The control shall acti-
vate the fill and drain solenoid valves to automatically maximize
efficiency. Unit will perform system self-correction procedures to
assist in preventing unit shutdown due to any fault in operational
sequence. A drain pulsing feature is included to assist in expelling
any blockage that may occur during a self-correcting drain cycle.
If self-correction procedures are unable to correct problems after
specific cycles, unit will automatically shutdown.
19.
The humidifier(s) shall include a non water contact capacitance
proximity high water sensor to prevent overfilling and loss of
water.
20.
The fill solenoid valve shall open whenever the drain solenoid is
activated, whether in automatic or manual operation, to prevent
discharge of boiling water into drainage system. Drain light shall
indicate the switch is in drain position.
21.
Humidifiers, dependent upon capacity, will have one (1) or two (2)
cylinders for operation. If a capacity is desired of 125, 150, 175
or 200 lbs./hr., the units will be equipped with two (2) cylinders,
each independently and separately controlled by their own control
signal.
22.
Automatic Drain of cylinder water will take place when there is a
demand signal loss for 72 hours. Unit will remain in stand-by in
the event that a quick start-up is required.
G-27
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