SAMUEL JACKSON Humidaire Southwest User manual

HU-SOUTHWEST-1480
“Humidaire Southwest”
Gas-Fired
Humidaire Unit

PAGE 0 of 84 HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
© SAMUEL JACKSON, INCORPORATED 2005 ALL RIGHTS RESERVED
TABLE OF CONTENTS
Introduction.................................................................................. 2
Summary of New Features........................................................... 3
Humidaire Unit Operation ........................................................... 4
Moisture Mirror II Option.......................................................... 11
Water Watch .............................................................................. 14
TRU-Temperature Diagnostic System....................................... 15
Powdered Acid Descaler............................................................ 16
Suggested Routine Water System Maintenance ........................ 17
ERROR & ALARM Logging System ....................................... 20
ERRORS and ALARMS Explanation ....................................... 21
Test Program .............................................................................. 33
Additional Settings..................................................................... 42
Installation Stub-Ups ................................................................. 46
Installation Notes and Instructions............................................. 49
14900A Lint Flue Scanner Installation, Settings and Use ......... 54
External Electrical Connections Diagram.................................. 56
Network ID Settings for Moisture Mirror II .............................. 57
Electrical Schematic with PLC Inputs ....................................... 58
Electrical Schematic with PLC Outputs..................................... 59
Gas Piping.................................................................................. 60
Recommended Minimum Pipe Sizes Table............................... 61
LPG Gas Tank Installation Drawing.......................................... 62
Cabinet Components.................................................................. 63
Water Pump & Pipe Train Components .................................... 64
Air Inlet & Spray Chamber Components................................... 65
13480A Burner Head Assembly ................................................ 66
Butterfly Water Valve Assembly............................................... 67
Component List.......................................................................... 68
Water Flow Diagram.................................................................. 74
Linkage Adjustment for Water Modulating Motor and Valve .. 75
7 ½HP Water Pump Components & Seal Assembly ................ 76
HU-SOUTHWEST-1480 Dimensions....................................... 77
Supplemental Section................................................................. 78
Steamroller Lint Conditioner ..................................................... 78
HG-1-1401A 1-million BTU/hr Heater & Lint Slide Grid........ 79
Seed Cotton Conditioning Hoppers ........................................... 80
Electrical Schematic for Conditioning Hoppers Relay Panel .... 81
13860 Relief Plug Assembly Installation .................................. 82
Copyright © 2005 SAMUEL JACKSON, INCORPORATED. All rights reserved

PAGE 1 of 84 HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
© SAMUEL JACKSON, INCORPORATED 2005 ALL RIGHTS RESERVED
We appreciate your business and hope you enjoy your
Samuel Jackson HUMIDAIRE SOUTHWEST
This manual contains information on the installation, startup, and operation of your Humidaire
Unit. Included is information on:
•Humidaire operation.
•Electrical installation.
•Gas piping and supply.
•Water supply and drainage.
•Compressed air supply.
•Humidaire Unit dimensions.
•Maintenance and troubleshooting.
When taking delivery of your new Humidaire Unit, take a moment to familiarize yourself with
the location of the less obvious items in the shipment. This service manual is normally shipped in
the BOX OF CONTROL PARTS. Included in this box are the air temperature thermocouple and
thermocouple hookup wire. If your Humidaire Unit will be used to add moisture to lint cotton a
14900A Lint Flue Scanner will also be included in this box.
We suggest that you check the contents of the box of control parts and then store them in a safe
place until installation time. This will help prevent some of the items from being misplaced or
being used for other jobs. Humidaire Unit installation will then go smoothly with no delays
waiting or looking for missing parts.
If the Humidaire Unit is part of a Samuel Jackson Conditioning Hopper Moisture System or a
Steamroller System, more detailed information for your system will be shipped to you under
separate cover.
IS STARTUP ASSISTANCE PROVIDED?
Depending upon your location, a startup and inspection service may be provided with your new
Humidaire Unit free of charge by Samuel Jackson, Inc. Please contact us to make arrangements
or for questions regarding startup services.
In the future when you require service, technical support, or parts please contact us by phone, fax,
or email. Our engineers and service people are available to assist you in obtaining the best
performance from your Samuel Jackson, Inc. products.
Again, thanks for choosing a Samuel Jackson HUMIDAIRE SOUTHWEST!
SAMUEL JACKSON, INCORPORATED
MAIL: P.O. BOX 16587 LUBBOCK, TEXAS 79490
COURIER: 3900 UPLAND AVENUE LUBBOCK, TEXAS 79407
TELEPHONE [phone] OR 800-862-9966
TELEFAX 806-795-8240
Email: [email protected]
Internet: www.samjackson.com

PAGE 2 of 84 HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
© SAMUEL JACKSON, INCORPORATED 2005 ALL RIGHTS RESERVED
HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
The Samuel Jackson Humidaire Unit generates
warm humid air which carries water vapor to
cotton fibers in a form which is quickly and
uniformly absorbed. Samuel Jackson Humidaire
Units have been in extensive use since 1959.
Humid air can be applied at various places in the
gin plant. Humid air applied to lint just before the
bale press reduces the force required to press out
uniform bales and increases lint turnout.
Humid air applied to the cotton just before the gin
stand restores moisture to dry and brittle fiber
before fiber-seed separation. This reduces short
fiber generated by the gin saws. In very dry
climates, humid air applied to seed cotton during
pre-cleaning reduces static electricity problems
that impede cotton flow.
This model incorporates a PLC with a touch
screen to handle combustion controls, diagnostics,
and self-test routines. Diagnostics include
automatic gas valve leak testing, automatic testing
of electrical interlocks, and monitoring of the
water system (water tank level, pump rotation,
overload relay, and scanner adjustment).
All parts of the spray chamber are quickly
accessible through two large access doors. The
mist eliminator, nozzles, float valve, and water
tank screen are easily serviced.
•POSITIVELY ELIMINATES STATIC
•REDUCES STRAIN ON PRESS
•ELIMINATES TIE BREAKAGE
•PRESERVES THE STAPLE LENGTH
•IMPROVES TURNOUT
•ADVANCED PURGE SYSTEM
•HYDRO-CYCLONE CLEANING
•ACCESS TO WATER TANK DURING
OPERATION
•MOISTURE “SPEEDOMETER”
•MOISTURE MIRROR II COMPATIBLE
•BUILT IN WATER WATCH
SPECIFICATIONS
At full throttle and 5000 CFM air delivery:
Maximum burner input capacity......3,000,000 BTU/Hr
Maximum natural gas consumption ..........3,000 CF/Hr
Maximum propane consumption .............35 US Gal/Hr
Water evaporation (peak) ......................252 US Gal/Hr
Water usage (peak with purge)..............290 US Gal/Hr
Minimum water pressure .................................... 20 PSI
Minimum fuel gas pressure .................................. 5 PSI
Minimum compressed air pressure..................... 80 PSI
Standard Electrical Power:
480 Volts, 3 Phase, 60 Hz
415 Volts, 3 Phase, 50 Hz
380 Volts, 3 Phase, 50 Hz
Drainage facilities should be provided for water drainage
of 500 to 1000 US Gal/24 Hrs (typical).

PAGE 3 of 84 HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
© SAMUEL JACKSON, INCORPORATED 2005 ALL RIGHTS RESERVED
What’s new in the HU-SOUTHWEST-1480
for experienced Humidaire users?
The following information is for those users with experience using older model Samuel
Jackson Humidaire Units who are making the transition to the HU-SOUTHWEST. New
features and differences in operation are briefly summarized. More detail on specific
features and options can be found in this manual under the appropriate section. In normal
circumstances, the user may safely use the factory settings that are preprogrammed in the
Humidaire Unit.
7.5 Horsepower Water Pump – A 7.5 horsepower stainless steel pump produces an
intense pattern of water droplets that mix directly with fire in the unique “Moisture
Tunnel”.
Hydro-Cyclone – The HU-SOUTHWEST has a hydro-cyclone that filters out lint fly
and particles as small as silt to keep the water system in tip-top shape. An on-line
cleaning cycle automatically dumps the filtered particles into the drain.
Access to Water Tank During Operation – Panels on either side of the water tank
slide back allowing easy access to the water tank, even while the Humidaire Unit is
operating. This allows the operator to easily check water level and water conditions.
The Humidaire “Speedometer” – For many years, the biggest part of the learning curve
on a new Sam Jackson Humidaire was getting comfortable setting operating
temperatures. For the experienced user, having independent temperature control is
powerful and exciting. For the new user, it can be confusing. With the Humidaire
“Speedometer”, a digital meter on the left displays the target output based on the air and
water temperature settings entered by the operator. A similar digital meter on the right
displays the actual performance of the unit. If the needles on the left and right meters
match, everything is OK.
Built-in Water Watch – For several years, an option has been available to display the
volume of water consumed by the Humidaire Unit in the form of both evaporation and
purge water. This capability is standard on the HU-SOUTHWEST.
Touch Screen Diagnostics – In earlier Samuel Jackson Humidaire models, diagnostics
are accessed by running a special test program. On the HU-SOUTHWEST, the technician
can activate diagnostic routines selectively from the touch screen without the need for
going through the sequence of a test program.
Moisture Mirror II Compatible – The HU-SOUTHWEST has Ethernet
communications capability which gives you the option of connecting it to a Moisture
Mirror II. It connects simply and easily to a Moisture Mirror II using a standard CAT-5B
cable. A single Moisture Mirror II will act as a common remote control for a maximum
of four 1400 series Humidaire Units and eight Samuel Jackson 1400 series heaters at the
same time. In addition to this, the Moisture Mirror II, properly equipped with sensors, can
control the temperature of the Humidaire automatically while coordinating the interaction
of all of your Sam Jackson moisture control products.

PAGE 4 of 84 HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
© SAMUEL JACKSON, INCORPORATED 2005 ALL RIGHTS RESERVED
HUMIDAIRE UNIT OPERATION
HOW DOES A HUMIDAIRE UNIT WORK?
Air is drawn into the Humidaire Unit and around a burner head that heats the air. This
hot air enters a stainless steel water spray chamber. In the spray chamber, the hot air is
scrubbed, cooled, and humidified by a large volume of water circulated through stainless
spray nozzles by a 7.5 HP pump.
Zig-zag mist eliminator baffles at the outlet of the spray chamber allow humid air to
leave while retaining water droplets. An external fan (not included) transfers the warm
humid air to the place in the gin where it is applied to the cotton. As the water is
evaporated from the tank, a float valve refills the tank.
Adjustment of the absolute humidity of air from the Humidaire Unit controls the amount
of moisture applied to the lint. Absolute humidity is controlled by setting the temperature
of air and water on the touch screen or optional Moisture Mirror II. The new Humidaire
Speedometer feature will show the operator how much moist air output results from the
temperature settings. Briefly stated, the closer these two temperatures are together, the
higher the absolute humidity.
The burner fuel valve is automatically regulated to maintain the air temperature selected.
At the same time, a stainless steel butterfly valve on the water system is regulated to
maintain the water temperature selected by controlling the volume of water exposed to
the heat through the water spray nozzles.
HOW DO I TURN IT ON?
Refer to the MOISTURE MIRROR II section of manual for more information on
operating the Humidaire Unit remotely using the optional Moisture Mirror II color touch
panel. The instructions below are for using the color touch panel mounted in the upper
cabinet door on the unit.
Touch the button on the left side of the screen marked with an “I” to turn on the
Humidaire burner. This provides warm dry air. Touch the button on the right side of the
screen marked with an “I” to enable the water pump. This will provide warm moist air
when cotton enters the system. The button marked with “0” is the corresponding OFF
button for each function.
If there is a problem detected by the Humidaire Unit control system, it will notify you on
the touch screen with a brief description that includes a diagnostic number. This number
will be helpful to the technician that offers assistance if you call the factory. Many

PAGE 5 of 84 HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
© SAMUEL JACKSON, INCORPORATED 2005 ALL RIGHTS RESERVED
problems are simple in nature (for instance a gas supply valve that is closed) and you may
be able to correct it without assistance.
Once flame is established, the system will begin warming up. There is a 90-second
(default) delay that prevents the water pump from coming on (even if the scanner reports
cotton in the lint flue riser) during this period.
TIPS
Many ginners normally turn the Humidaire Unit on first in the gin startup sequence to
give additional warm-up time for improved operation.
WHY IS THERE A DELAY AFTER I TURN IT ON?
After the burner start button is touched, the combustion control computer begins opening
and closing valves to test the integrity of various safety switches. If it finds a problem
with one of these devices, it alerts the operator with an ALARM or ERROR message that
corresponds to the problem.
Picture of flame
indicates flame
is established.
Picture of water
indicates pump
is running.
Actual water
temperature.
Actual air
temperature.
Water temperature
setting.
Water pump ON-
OFF buttons.
Air temperature
setting.
Burner ON-OFF
buttons.
Access the Humidaire
Speedometer.
Access technical and
diagnostic routines.
View operation details
and water statistics.
Home Screen

PAGE 6 of 84 HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
© SAMUEL JACKSON, INCORPORATED 2005 ALL RIGHTS RESERVED
These diagnostics are performed every time the Humidaire Unit is started. They continue
during operation and approximately 10 minutes after shutdown.
ALARMS and ERRORS are described more fully later in this manual. ALARMS will
warn until reset by pressing OK button and ERRORS will cause an immediate shutdown.
TIPS
Always leave power on the Humidaire Unit during gin season. There is a permanent
memory in the combustion control computer that remembers when you turned off the
power and did not permit the computer to check the gas valves. It will result in an error
if power is removed before diagnostics are completed.
To prevent lightning damage to controls in the off season, it is a good idea to turn power
off to the control cabinet until it is needed again.
HOW DO I SET THE TEMPERATURES?
Air and water temperatures are set independently on either the color touch panel located
at the Humidaire Unit or on the optional Moisture Mirror II screen. To set the
temperature, touch the air or water temperature setting button area. The screen shown
below will come up. Enter the new temperature setting then press ENTER.
If the Humidaire Unit is operating with a Moisture Mirror II and automatic moisture
control based on bale lint moisture is active, the water temperature is adjusted
automatically. In all cases, the air temperature is adjusted manually. More details for
operation with the optional Moisture Mirror II is described later in the manual.

PAGE 7 of 84 HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
© SAMUEL JACKSON, INCORPORATED 2005 ALL RIGHTS RESERVED
HOW DO I CONTROL THE AMOUNT OF MOISTURE OUTPUT?
The closer the air and water temperatures are to each other, the more humid the air
becomes. This increases the moisture added to the cotton. When these temperatures are
too close together, excessive condensation can occur and create problems.
Many ginners set the air temperature at 125°F [49°C]. They move the water
temperature closer to the air temperature until the cotton becomes sluggish on the lint
slide or feeder apron, then back off the water temperature a little. When ginning at night
or in cold, damp weather, lower the water temperature a little. It will not be possible to
raise the actual water temperature to more than about 3°F [2°C] above the air
temperature.
If desirable humidification is not reached at 125°F [49°C], or if moisture condenses, try
raising the air temperature a few degrees. Then re-adjust the water temperature. Call the
factory if problems persist.
The maximum setpoint temperatures are preset at 155°F [68°C] at the factory. The
ability to add more moisture into the air at temperatures above 155°F [68°C] is
marginal. Operating the Humidaire Unit at high temperatures will also shorten its life.
WHAT IS THE HUMIDAIRE “SPEEDOMETER”?
For the new user, setting air and water temperatures can be confusing. With the
Humidaire “Speedometer”, a digital meter on the left displays the target output setting
based on the air and water temperature selected by the operator. A similar digital meter
on the right displays the actual output of the unit. 0% represents minimum moisture
output, 100% represents maximum output. If the needles on the left and right meters
match, everything is OK.
Use the arrow buttons (“<” or “>”) to increase or decrease temperature settings (setpoint).
Access this screen by pressing the large question mark button (“?”) on the home screen.
Speedometer Screen

PAGE 8 of 84 HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
© SAMUEL JACKSON, INCORPORATED 2005 ALL RIGHTS RESERVED
WHAT IS THE “TEST PROGRAM”?
The TEST PROGRAM can be activated by a qualified service man to test a new
installation. This feature allows the serviceman to proceed through a series of tests where
individual components of the Humidaire Unit can be calibrated and adjusted. It may also
be used in the future by the operator or service man to troubleshoot a problem.
The test program is also performed on each new Humidaire Unit before it leaves the
factory. See the TEST PROGRAM section of manual for more information.
WHAT NEEDS TO BE DONE AT THE END OF THE SEASON?
During the last days of the ginning season we recommend using our Powdered Acid
Descaler (part number 14000) to assist in removing scale from the piping and spray
chamber of the Humidaire Unit. We also recommend using the descaler periodically
during the ginning season if excessive scale buildup is noticed. See POWDERED ACID
DESCALER section for instructions on its use.
When the unit is finished for the season, wash any sludge from the tank and use the drain
outlet to empty the tank. Also wash and scrub the strainer screen on the tank inlet to the
water pump as well as the mist eliminator. Use the plug in the bottom of the water pump
to drain it.
Use an air hose to blow dust buildup off burner duct, water pump, and gas valve
assemblies. Cut off the gas supply at the ball valve. Disconnect electrical power.
IS THERE ANYTHING I CAN DO TO ENHANCE PERFORMANCE?
See the section SUGGESTED ROUTINE MAINTENANCE for tips on maintaining the
unit in top form for maximum performance during the season.
INSULATION: In areas where the weather is sometimes cold during ginning season,
insulating (lagging) the humid air pipes and the lint slide is a good idea. This will
usually allow the air and water temperatures to be set closer together, enhancing
operation.
For Conditioning Hopper Systems operating in cold climates, insulating the manifold
pipes connecting the air to the Hoppers is a necessity. Keeping the moist air temperature
uniform throughout the manifold piping ensures the moisture application is uniform at
each gin stand.
A cost effective method of insulation is to wrap the moist air pipes with 4 inch thick
fiberglass batt insulation. Cover the insulation with Cotton Koozie Shrink Wrap Film
(part number 20750) and shrink in place with a propane powered heat gun. Heat guns are
available from the factory for rental or purchase.

PAGE 9 of 84 HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
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TIPS
Some moisture condensation will form even inside insulated (lagged) pipes. When
insulating moist air pipes, it is recommended that the flange joints not be insulated. The
flanges are where most leakage will occur. If the flanges are wrapped, then this water is
captured and will soak the insulation.
Applying Cotton Koozie
Shrink Wrap Film over
fiberglass batt insulation.

PAGE 10 of 84 HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
© SAMUEL JACKSON, INCORPORATED 2005 ALL RIGHTS RESERVED
HANDHELD MOISTURE METER: If a handheld moisture meter is desired, Samuel
Jackson offers the Delmhorst Model C-2000. Probes are available to measure cotton
moisture using a bale probe, module probe, or cup electrode.
C-2000 Moisture Meter
(Part No. 16001A)
shown with
52-E/C Seed Cotton Cup Electrode
(Part No. 16003A).
30-E/C Bale Moisture Probe
(Part No. 16002A)
830-T/C Tee Handle Module
Moisture Probe, 38 inch long
(Part No. 16876A)

PAGE 11 of 84 HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
© SAMUEL JACKSON, INCORPORATED 2005 ALL RIGHTS RESERVED
MOISTURE MIRROR II
for remote control & optional automatic control
The HU-SOUTHWEST-1480 Humidaire Unit is compatible with the optional Moisture
Mirror II, offering remote control (normally from ginner’s console) of the unit via a
CAT-5B Ethernet connection. It has the ability to control up to four 1400 series Samuel
Jackson Humidaire Units and eight 1400 series Samuel Jackson Heaters.
When the Moisture Mirror II is equipped with compatible moisture sensors at various
stages in the ginning process it offers automatic dryer temperature control. It can also
automatically adjust the water temperature setpoint on the lint moisture Humidaire Unit
supplying moist air to moist air applicators like the Steamroller and Moisture Tracker.
Refer to the Moisture Mirror II manual for more information on features, connections and
compatible moisture sensors.
The START / STOP operations, temperature settings, display of actual temperatures and
information like evaporation rates and run time are displayed on the Moisture Mirror II’s
color touch panel. When an ERROR or ALARM occurs, this information is also
displayed.
To access screens that require a password, 1234 is the default user password. If there is
any question about a making a change to a default setting, press the large question mark
button (“?”).
Press HUMIDAIRES button to go
to screens for Humidaire control
Home Screen for Moisture Mirror II

PAGE 12 of 84 HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
© SAMUEL JACKSON, INCORPORATED 2005 ALL RIGHTS RESERVED
After pressing the HUMIDAIRES button, the following screen will appear. Touch the
button for the Humidaire Unit number you wish to access control functions for.
Press HUMIDAIRE # 1
button to access control
for the number 1 unit.
Press
“TARGET”
button to adjust
temperature set
points (desired
temperature)
Press “START” and
“STOP” buttons to
turn flame on and off
Press “PUMP ON” and
“PUMP OFF” buttons to
enable or disable water
pump

PAGE 13 of 84 HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
© SAMUEL JACKSON, INCORPORATED 2005 ALL RIGHTS RESERVED
If automatic “feedback” control of lint moisture is desired and a compatible sensor is
installed, touch the BALE button on the Moisture Mirror II’s home screen. Then press
SETUP button and the screen shown below will appear. Choose the number of the
Humidaire Unit supplying moist air to the lint moisture applicator. The Moisture Mirror
II will automatically adjust the water temperature setpoint to try to maintain the desired
target percent (%) of moisture. The water temperature will not be adjusted above the air
temperature setting.
TIPS
On dry, hot afternoons, adjust the air temperature setting higher if the target % moisture
is not obtained and the Moisture Mirror II has the water temperature setting equal to the
air temperature setting. The maximum air temperature setting is 155 ° F [68 ° C].
Operating the Humidaire Unit at high temperatures will shorten its life.
Press ”?” button to
access help screens
Press the button
corresponding to the
number of the
Humidaire Unit that
will use the
automatic control. A
green number means
that automatic
control is active.
Bale Moisture Setup Screen

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WATER WATCH
The Water Watch system shows the evaporation rate of water and is standard on the HU-
SOUTHWEST. During operation, two water meters keep track of fresh water supplied to
the unit and purge water released from the unit. By subtracting the purge water volume
from the fresh water volume and averaging this over a period of 30 minutes, the average
rate of evaporation in gallons per minute is calculated. The Water Watch screen shows all
three rate values in addition to the total cumulative gallon values and user resetable
values.
The “Fresh” value is the average intake water usage. The “Purge” value is the average
purge water released from the unit. The “Evap” value is the average evaporation rate. All
three of these values are expressed in gallons per minute.
Current average
evaporation rate in
gallons per minute
Water Watch Screen
Total gallons of intake
and purge water for the
life of the unit
Total gallons of intake
and purge water since
the counter was last
reset

PAGE 15 of 84 HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
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TRU-TEMPERATURE DIAGNOSTIC SYSTEM
Background
The first model of Humidaire Unit to display actual water temperature for the benefit of
gin personnel was the model HU-60-1106C. This was an improvement over prior models
that provided no temperature display.
On the HU-60-1106C, if the actual water temperature is far below the desired water
temperature, this is shown on the display, but not always understood by the operator.
Instead of adding moisture to the fiber, this condition dries the fiber because of the low
relative humidity of the heated air. In gins where personnel understand the significance
of the water temperature and monitor the water temperature display closely, excellent
performance is achieved.
The TRU-Temperature diagnostic on the HU-SOUTHWEST Humidaire model is
designed to automatically and continuously monitor water temperature for the operator.
By performing this function, it provides consistent performance from the Humidaire Unit
for all users, experienced and novice, by prompting personnel when a water temperature
problem occurs.
TRU–Temperature Explained
TRU-Temperature stands for “Timed Response Under-Temperature.” It is designed to
notify users when a common problem occurs with the HU-SOUTHWEST Humidaire
Unit such as low water temperature. Low water temperature can be caused by clogged
water nozzles, a malfunctioning float valve, a problem with the Humidaire burner, a
problem with the water pump, or other potential problems. Water temperature is the most
important variable to be watched while monitoring the performance of a Humidaire
System.
To assist the ginner in watching the water temperature, the TRU-Temperature logic
monitors the difference between the desired water temperature and the actual water
temperature. If a low water temperature condition persists for more than 30 minutes the
Humidaire Unit is turned off and a message is displayed.

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POWDERED ACID DESCALER
Powdered Acid Descaler (Part No. 14000) is a special formulation designed for removing mineral
scale from the piping and spray chamber of the Humidaire Unit. It is supplied in a 50 pound (22.7
kg) pail. Use the Powdered Acid Descaler periodically during the season if excessive scale
buildup is noticed and also near the end of the season. It does not prevent the build up of scale.
Maintaining a properly adjusted and working Water Purge System is the best insurance against
excessive scale buildup and maximum Humidaire Unit performance. If excessive scale build up
continues to be a problem, call the factory for assistance. Perform treatment sparingly since
excessive Powdered Acid Descaler use will shorten life of water pump shaft seals and water
train components.
TIPS
Humidaire Unit users find that using a treatment of Powdered Acid Descaler during the last day
or so of the ginning season results in a clean machine for the beginning of the next season.
HOW TO USE THE DESCALER
1. Drain water and sludge from water tank of Humidaire Unit using 2 inch drain outlet.
2. Clean Water Pump Inlet Screen in tank.
3. Place 10 pounds (4.5 kg) (about 1 gallon or 3.8 liters) of descaler in the water tank.
4. Close drain outlet and refill water tank.
5. Set Purge Valve Control to DISABLE. See ADDITIONAL SETTINGS section of
manual and subtopic for Time Settings on how to do this.
6. Resume normal operation for 24 hours.
7. Drain dissolved minerals and acid from tank using 2 inch drain outlet.
8. Clean Water Pump Inlet Screen and refill tank with water.
9. Set Purge Valve Control back to ENABLE.
TIPS
A good way to reduce the formation of scale buildup is to periodically drain the water
tank, flush and refill with fresh water. Small lint fly, dirt, and sediment captured by the
Water Pump Inlet Screen can then be removed. The water purge system cannot remove
these items since they are not circulated through the water pump.
Many Humidaire Unit users find it handy to attach a garden hose with a spray nozzle for
spray chamber cleaning to the hose faucet provided just before the fresh water inlet on
the water tank.

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SUGGESTED ROUTINE WATER SYSTEM MAINTENANCE
Keeping the water spray chamber, nozzles and water tank clean are important for optimal
performance. The HU-SOUTHWEST has a number of features that help the unit stay
clean. The on-line cleaning cycle which dumps filtered particles into the drain is
automatic. Every week or two, it is a good idea to check the points shown below to help
the system remain in tip-top shape.
A ball valve is located at the flow end of the
header piping to allow quick and easy flushing
of debris in the header pipes. The ball valve is
located under the spray chamber bottom. When
the water is cool, open the valve, then use the
“JOG PUMP” feature to run the pump. Loose
particles in the header pipes will flush out into
the water tank.
The Hydro-cyclone (HYD) has a Sediment
Tank (SED) where the particles land during
normal operation. Every 25 minutes, the
FLUSH VALVE (FV) opens which allows
water to swish the particles into the drain. This
time is adjustable. See the “Additional Settings
section of this manual. Drain the water tank
then open the end of the Sediment Tank (SED)
to make sure that the particles are flushing out.
After draining the water tank, check the
water pump intake screen (SCRN1). It is
normal to find some lint fly sticking to it.
This can be easily brushed off to keep
water flow to the water pump
unrestricted.

PAGE 18 of 84 HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
© SAMUEL JACKSON, INCORPORATED 2005 ALL RIGHTS RESERVED
WATER NOZZLES CLEANING & ADJUSTMENT
On the HU-SOUTHWEST, it is important that the water spray nozzles (NOZ) remain
clean for optimal moist air generating performance. Unlike other Humidaire Units with a
single “plane” of water spray nozzles for the water to pass through, the HU-
SOUTHWEST forces the hot air to run through the water spray from numerous spray
nozzles forming numerous “planes” of water spray. We call this the “moisture tunnel”.
This “moisture tunnel” design keeps the performance of the HU-SOUTHWEST from
being greatly affected from just a few clogged nozzles.
Clogged nozzles can be identified by turning off flame, opening a spray chamber door
and pressing the “JOG PUMP” button on the color touch panel (TP). Sometimes a clog
can be removed by blowing into the nozzle orifice with an air nozzle if the clog is a
platelet of debris covering the hole. Normally, the nozzle has to be removed and the
mineral buildup picked or drilled out.
Aim the nozzles 30 to 45 degrees in direction of the air flow. See diagram below. If a
nozzle aims straight out into the spray chamber or toward the burner duct, water will leak
out of the burner duct and air inlet screen (SCRN2).
Spray Chamber Header Pipes and Nozzles