woodmizer KD250 Series User manual

User Manual
KD250 Series
Wood-Mizer LLC
8180 West 10th Street
Indianapolis, IN 46214
Wood-Mizer
World Headquarters
Wood-Mizer

Safety Guidelines .......................................................................................................................................................... 1
Precautions ............................................................................................................................................................................................ 1
Electrical Grounding .......................................................................................................................................................................... 1
Your Kiln ......................................................................................................................................................................... 2
How your Dehumidification Kiln Works .................................................................................................................................. 2
Getting Started ............................................................................................................................................................. 2
Floors ...................................................................................................................................................................................................... 2
Ceilings ................................................................................................................................................................................................... 2
Doors ....................................................................................................................................................................................................... 2
Construction Guidelines ................................................................................................................................................................. 3
Baffles and Deflectors ....................................................................................................................................................................... 3
Power Vent ............................................................................................................................................................................................ 3
Chamber Plans ............................................................................................................................................................... 4
Chamber Dimensions ........................................................................................................................................................................ 7
Wall Details ............................................................................................................................................................................................ 8
Front Elevation .................................................................................................................................................................................... 9
Door Framing ..................................................................................................................................................................................... 10
Deflectors and Baffles .................................................................................................................................................................... 14
Equipment Front ............................................................................................................................................................................. 15
Equipment Back .............................................................................................................................................................................. 16
Power Vent Wiring ........................................................................................................................................................................... 17
Fan Diagram ....................................................................................................................................................................................... 17
Equipment Installation ............................................................................................................................................... 18
Wet and Dry Bulb Sensors ......................................................................................................................................... 18
Sensor Technology ........................................................................................................................................................................ 18
Dry Bulb Sensor .............................................................................................................................................................................. 18
Wet Bulb Sensor ............................................................................................................................................................................. 19
Wet Bulb & Dry Bulb Installation .............................................................................................................................................. 19
Kiln Control ................................................................................................................................................................... 19
How the Controller Works ............................................................................................................................................................ 19
Using the KD250 ................................................................................................................................................................................ 20
Parameters .......................................................................................................................................................................................... 20
Settable Parameters ........................................................................................................................................................................ 20
Alarm Conditions / Messages ...................................................................................................................................................... 21
Timber Probes .................................................................................................................................................................................. 21
Probe Placement ............................................................................................................................................................................. 21
Table of Species in each Wood Group ................................................................................................................................. 22
KD250 Technical Specifications .................................................................................................................................................. 23
Control Wiring ................................................................................................................................................................................... 23
Drying Lumber ............................................................................................................................................................. 23
Placing Stickers and Loading Lumber...................................................................................................................... 23
Table of Contents

Ensuring Proper Airflow .............................................................................................................................................. 23
Drying Schedules ........................................................................................................................................................ 24
Wood Groups ............................................................................................................................................................. 24
Lumber Types ............................................................................................................................................................. 24
Moisture Removal Rates ............................................................................................................................................ 25
Drying Schedules ....................................................................................................................................................... 25
Drying Rates (North American Measure) ............................................................................................................... 26
Drying Rates (Metric) ................................................................................................................................................ 27
Kiln Sample Boards .................................................................................................................................................... 28
Uses for Sample Boards ............................................................................................................................................. 28
Taking Samples ............................................................................................................................................................ 28
Record Keeping........................................................................................................................................................... 29
Drying Rate Index (DRI) ............................................................................................................................................. 30
Drying Tips ................................................................................................................................................................... 31
Drying Charts .............................................................................................................................................................. 32
Kiln Cart ......................................................................................................................................................................... 34
Kiln Cart Layout ................................................................................................................................................................................ 35
Kiln Cart Assembly ............................................................................................................................................................................ 35
Wiring Diagrams ......................................................................................................................................................... 35
KD250 Maintenance ................................................................................................................................................. 36
General Maintenance .................................................................................................................................................................... 36
Air Inlet Filters ................................................................................................................................................................................. 36
Refrigerant Charging Procedure ............................................................................................................................................... 36
Controller Factory Setting ........................................................................................................................................................ 36
Appendix ..................................................................................................................................................................... 37
Terminology ...................................................................................................................................................................................... 38
Troubleshooting ........................................................................................................................................................ 40
KD250 Upgrades & Accessories ........................................................................................................................... 39
Spray Systems Kit ............................................................................................................................................................................. 39
Heat Booster Package ................................................................................................................................................................ 39
Kiln Store .................................................................................................................................................................... 40
Warranty ..................................................................................................................................................................... 40
Wet Bulb & Dry Bulb Installation Template ..................................................................................................... 41
Service Log .................................................................................................................................................................... 42
Notes ............................................................................................................................................................................ 43
Data Stickers ................................................................................................................................................................ 43

Getting Service
Wood-Mizer is committed to providing you with the latest technology, best quality and
strongest customer service available on the market today. We continually evaluate our
customers’ needs to ensure we’re meeting current wood-processing demands. Your
comments and suggestions are welcome.
General Contact Information
Toll free phone numbers are listed below for the continental U.S. and Canada. See the next
page for contact information for more Wood-Mizer locations.
Office Hours: All times are Eastern Standard Time.
Please have your vehicle identification number and your customer number ready when you call.
Wood-Mizer will accept these methods of payment:
Visa, Mastercard, or Discover
COD
Prepayment
Net 15 (with approved credit)
Be aware that shipping and handling charges may apply. Handling charges are based on size
and quantity of order. In most cases, items will ship on the day they are ordered. Second Day
and Next Day shipping are available at additional cost.
If your equipment was purchased outside the United States or Canada, contact the dis-tributor
for service.
United States Canada
Sales 1-800-553-0182
Service 1-800-525-8100
Website www.woodmizer.com
1-877-866-0667
1-877-866-0667
www.woodmizer.ca
E-mail [email protected] [email protected]om
Monday - Friday Saturday
(Indianapolis Office Only)
Sunday
8 a.m. to 5 p.m. 8 a.m. to 12 p.m. Closed
KD150 12/22/17

1
Read through entire manual before installing, operating, or servicing this unit.
Failure to follow any steps or guidelines could result in personal injury, death, destruction
of property or may cause the unit to become inoperable. These are the “original Instructions for this unit.”This
manual must be kept with the unit at all times.
Safety Guidelines
Precautions
Do not operate if the unit or any of its parts:
• Have been exposed to fire.
•Have been submerged in or exposed to excessive
water.
• Has significant interior or exterior damage.
If any of the above are suspected make sure to have
your unit serviced by a qualified professional before
continuing operation.
*The unit is rated for an ambient temp of 10-40° C, 80 RH % at a
maximum 200 meters.
Electrical Grounding
The unit must be grounded.
Failure to ground the unit will result in unreliable
performance or an inoperative unit. You can ground
the unit by connecting the unit to a grounded
metal, permanent wiring system. Make sure the
unit is in accordance with national and local electrical
codes. If you don’t know the building codes in your
area or need more information, please contact your
municipal office.
*Normally airborne noise is rated at 77 dB.
Refrigerant!
• Unit contains R-134a refrigerant under high
pressure. Refrigerant must be recovered to relieve
pressure before servicing.
• DO NOT use unapproved refrigerants, substitutes
or additives.
• Failure to abide by these guidelines can result in
death, injury and property damages.
• Contact Nyle’s service department for more
information on refrigerant options.
Electrical Shock!
•Turn off power to unit
before service.
• Make sure wires are labeled
before disconnecting.
• Test unit after reconnecting
wires.
• Failure to do the above could result in death or injury.
High Temperatures!
• Kiln chamber can reach
internal temperatures of
over 90°F. working in these
temperatures can cause heat stroke and minor burns.
• Pregnant women, children, the elderly and those
with signicant health issues are at higher risk of heat
stroke and must be supervised in high temperatures.
• Kiln operators should check for temperature and
take proper safety precautions before entering the
kiln chamber.
• DO NOT purge or
pressurize this system with
oxygen to test for leakage.
Using oxygen may cause
explosive reaction.
Explosion Hazard!
Supervision!
- The appliance is not to be used by person (including
children) with reduced physical, sensory or mental
capabilities, or lack of experience and knowledge,
unless they have been given supervision or instruction.
- Supervised children are not to play with the appliance.

2
Your Kiln
How your Dehumidification Kiln Works
Thank you for purchasing a Wood-Mizer
Dehumidification Kiln and taking the first step
towards making the lumber industry cleaner and
more efficient! Years of development, innovation
and the highest quality materials have gone into
building your kiln. It’s our dedication to efficiency
that sets Wood-Mizer kilns apart from the rest
making your system the best on the market.
During kiln drying, moisture from green lumber is
evaporated into the air increasing the humidity inside
the chamber. The lumber can’t continue to dry if the
air becomes over-saturated therefore the moisture
must be periodically removed from the chamber.
In a conventional kiln moisture would be expelled
through venting. Venting causes a significant loss
of heat resulting in a waste of energy to bring the
kiln back up to temperature.
Instead of venting, Dehumidification Kilns
utilize a refrigeration system that condenses the
excess moisture. This moisture is then drained off
retaining the existing heat energy. After the moisture
is removed and heat is reintroduced to the dry air it
is pumped back into the kiln chamber to start the
process kiln is only used during the initial warm up
and sometimes when temperature increases are
desired during the cycle, saving you time and
money. But that’s not all your new kiln has to offer!
Though Wood-Mizer kilns don’t rely on venting
to get rid of moisture, a Vent System is supplied
to add extra control of your kiln temperature. If
the internal kiln temperature exceeds what’s
required, these vents can be opened to remove
excess heat and bring the temperature back to
where it needs to be.
Finally Wood-Mizer Systems offers a wide variety of
upgrades and accessories to enhance your kiln drying
experience. See the upgrades and accessories
section on page 39 for more information. By
purchasing a Wood-Mizer Kiln you have the
support of Wood-Mizer’s service team,
the very same professionals that built and
tested your unit. Enjoy your new system!
Getting Started
Please read through carefully as some options may not
apply.
Floors
Concrete floors with insulation installed
underneath is recommended for best results.
However if the kiln is going to be on an existing
concrete floor, the insulation may be omitted.
Concrete must not extend beyond the kiln walls.
Wood floors may be used but must be built
to construction guidelines (see Pg 3)
Ceilings
If the kiln chamber is a freestanding outside building,
the attic space must be well ventilated through
the eaves. This is done to avoid any moisture
buildup in this space, which will condense on the
cold roof and drip onto the insulation.
An interior kiln can have the ceiling insulation
open to the atmosphere.
Ceilings must be built to construction
guidelines. (Pg 3)
Doors
At the front of the kiln chamber install bay/loading
doors with at least two sides hinges and a
center door latch to close (recommended). Top
hinged or a lift off doors are also acceptable.
At least one access door should be installed in the
back of the chamber to allow for service of
the dehumidifier and/or lumber monitoring.
All installed doors must:
•Be built to construction guidelines. However
they may be lightened by increasing the stud
spacing and using 3/8” plywood. The lighter
weight will reduce the load on the hinges
• Have a vapor barrier.
•Have gaskets wherever the door meets the kiln;
this will give a good, airtight fit.
•Have a scraper type weather strip to reduce air
leakage if door sill is not present.

3
•Close tightly against the gasket using turnbuckles,
tarp straps, lag studs with wing nut, etc.
Remember: There will be considerable expansion
and contraction during kiln use so it is imperative
to plan your kiln door construction accordingly.
While outside electronic moisture meters can be
used to avoid entering the kiln, during the drying
cycle, Wood-Mizer strongly recommends
regular checks inside the kiln to visually
inspect the surface or ends for checks, mold,
stain as well as testing with a hand held meter.
Construction Guidelines
Please reference Chamber Plans for more information
on construction.
Step 1: Build all walls, ceilings and floors with a 2” x
4” framework using blue or pink Styrofoam (extruded
polystyrene) friction fitted between the studs.
Step 2: Cover the interior face of the studs with a
1” layer of Celotex Thermax ( for better results overlap
two ½” layers).
Celotex Thermax is foil faced polyisocyanurate
(urethane) board which is orange or yellow in color
and is available in 4’ x 8’ sheets of various thicknesses.
Celotex Thermax is a trade name, similar products
under other trade names are acceptable.
Note: If you want to use spray foam insulation, only
use urethane based spray foam applied at 2.2lb/cu
ft. Fiberglass is never recommended.
Step 3: Caulk joints and nail heads with a high
temperature silicone (optional: apply aluminum
tape over silicone)
Step 4: Cover Thermax with one or two layers of 6
mil polyethylene, then enclose with ½” CDX or marine
grade plywood.
Step 5: Coat CDX interior surface with “mobile
home or metal roofing aluminum paint”
Note: Paint is an asphalt based coating with powdered
aluminum and fiber for strength, available in most
hardware stores. Re-coat as necessary every year.
Step 6: Finish exterior walls to suit your tastes, but
avoid galvanized steel or other ferrous sidings.
Once you have completed construction of the kiln
chamber install the following air deflectors and
baffles to control the airflow within the chamber.
Baes and Deectors
Do not underestimate the effect of baffling. Correct
baffling will result in faster and more even drying.
The benefits more than offset the extra time and
effort to correctly place the baffles.
•Corner deector: typically made of plywood
are used to help turn the airflow.
•Top Bae: Hinged baffle that falls from the fan
wall to the top of the load used to compensate
for different load sizes, and allow for shrinkage
of the board pile.
•Side Bae: Baffle that closes in the open space
when lumber that does not fill the entire width.
This baffle can be fixed or portable.
Please reference pg 14 for more information on
deflectors and baffles.
Power Vent
The Power Vent is to be secured to the inside of
the kiln wall with the fan side facing the exterior.

4
Do It Yourself Chamber Plans
KD250
KD250

5

6

7
Chamber Dimensions

8
Wall Details

9
Front Elevation

10
Door Framing

11

12

13
GASKETS AND DOOR KITS AVAILABLE

14
REFERENCE
DEFLECTORS AND BAFFLES
1 OF 1
REV
CUSTOMER
DWG FILE NAME
CHECKED
TITLE
PB DWG FILE NAME
SHEETSCALE
DRAWN BY
NTS
12 Stevens Road
Brewer, Maine 04412
Tel: [phone] Int'l: 1-800-777-6953
Fax: [phone] Email: [e-mail]
1.0
FAN WALL
TOP BAFFLE
SIDE BAFFLE
SIDE BAFFLE
BLOCK AIR GAP
STACKING & BAFFLING
CLOSE ALL LARGE AIR GAPS SO THAT AIR CAN ONLY PASS THROUGH THE STICKER SPACE CAREFULLY ALIGN STICKERS VERTICALLY
HANGED BAFFLE FROM FANWALL TO FRONT EDGE OF LUMBER STACK
Deectors and Baes

15
Equipment Front
240/1/50 - 60Hz 40 AMP POWER
OUTLET PLUG AND RECEPTICAL SUPPLIED BY THE CUSTOMER.
KD250 CONTROLLER
FAN SWITCHES AND COVERS PROVIDED BY WOODMIZER. BOXES FROM CUSTOER.