DriSteem HUMIDI-TECH User manual

READ AND SAVE THESE INSTRUCTIONS
HUMIDI-TECH and
HUMIDI-TECH DI
ELECTRIC STEAM HUMIDIFIERS
Installation Instructions
and
Maintenance Operations
Manual
UL LISTED CUL LISTED
®
®

2
TABLE OF CONTENTS
TO THE PURCHASER AND INSTALLER
Thank you for purchasing our HUMIDI-TECH®humidifier. We have designed and built this equipment to give you
complete satisfaction and trouble-free service for many years. Familiarizing yourself with this manual will help
ensure proper operation of the equipment for years to come.
This manual covers the installation and maintenance procedures for both the HUMIDI-TECH and
HUMIDI-TECH DI humidifiers.
DRI-STEEM Humidifier Company
HUMIDI-TECH Diagrams......................................................3
Installation
Locating and Mounting the HUMIDI-TECH Humidifier ..........4
Examples of Mounting the Dispersion Tube ..........................4
Mounting Dispersion Tube with Condensate
Drain Line...............................................................................5
Connecting Dispersion Tube to Humidifier ............................6
Piping....................................................................................7
Wiring....................................................................................8
Electrical Specifications and
Capacities/Dimensions .......................................................9
Area-Type Application Using Space
Distribution Unit (SDU) .......................................................10
Start-up and Operation .......................................................12
Maintenance .........................................................................14
HUMIDI-TECH Trouble-Shooting Guide ............................16
HUMIDI-TECH DI Trouble-Shooting Guide .......................17
Replacement Parts...............................................................18
Maintenance Service Record ..............................................23
Two-Year Limited Warranty ................................................24

3
Figure 3-2: HUMIDI-TECH DI Humidifier
(Deionized Water)
The HUMIDI-TECH DI humidifier
shown here is specifically designed
for use with deionized or reverse
osmosis water.
Figure 3-1: HUMIDI-TECH Humidifier
The HUMIDI-TECH unit requires water
conductivity of at least 100 μS/cm (34 mg/l)
to operate. It will not operate with water
treated by reverse osmosis or
deionization processes.
(See DI model below.)
HUMIDI-TECH®DIAGRAMS
OM-287A
38 mm or 50 mm Flexible
vapor hose connects to
dispersion tube induct.
Wall Mounting
Bracket
Entire floor of unit is a drip tray. Tray has
threaded drain fitting for piping to
plumbing drain in building.
Water Float Valve
Evaporatingchamber
drain connected by
20 mm flexible
hose to ball
valve.
20 mm Flexible hose connection
to overflow drain.
Connector Tube
Duct
OM-288A
38 mm or 50 mm flexible
vapor hose connects to
dispersion tube induct.
Wall Mounting
Bracket
Entire floor of unit is a drip tray. Tray has
threaded drain fitting for piping to
plumbing drain in building.
Removable
Evaporating
Chamber
Evaporatingchamber
drain connected by
20 mm flexible hose to
timer-operateddump
valve.
Connector Tube
Water Inlet Stand Pipe
20 mm flexible hose
connection to skimmer port
and overflow drain.
Condensate
Return Line
Duct
T-handled
Utility Knobs
Low-water Cut-off Switch*
*Caution: Low-Water Cut-Off Switch
contact is normally open when float is
in its lowest position.
INCOLOYAlloy-Sheathed
Immersion Heaters
Removable
Evaporating
Chamber Slide assembly under evaporating chamber
provides easy removal for cleaning
Removable Front Panel
with Key Lock
Slide assembly under evaporating chamber
provides easy removal for cleaning
T-handled Utility Knobs
INCOLOYAlloy-Sheathed
Immersion Heaters
Connector Tube
Connector Tube
Front
Panel with
Key Lock
Plumbing and Electrical Access
Hole for Mounting Lug
Plumbing and Electrical Access
Hole for Mounting Lug
Note: All removable doors, panels and covers are grounded to the earth bar. Care
must be taken to connect these grounds back on to parts removed during service.

4
INSTALLATION
connections are made at the lower right rear corner of
the unit.
When mounting on a stud wall, locate studs and
position mounting bracket in place so that each of the
two holes will center on a stud. Mark hole locations
and pre-drill 6 mm diameter pilot holes. Secure
bracket to wall with lag bolts provided. The hole in the
back of the cabinet above the plumbing opening is for
a lag bolt into the wall to secure the cabinet on the
hanging bracket.
For hollow block or poured concrete wall mounting,
position mounting bracket in place and mark the
second hole from each end. Drill appropriate pilot hole
for two 10 mm toggle bolts or two 10 mm machine bolt
lead anchors. Secure bracket in place.
When the HUMIDI-TECH humidifier is in final opera-
tion, the panel access keys should be removed and
secured in a different place.
Examples of Mounting the Dispersion Tube
Figure 4-1: Mounted Horizontally in Duct
38 mm Vapor Hose
(50 mm for VM25)
Vapor hose and dispersion tube should be pitched back to the humidifier with a
gradual slope of 165 mm/m (minimum). VM34 must use a multiple tube steam
dispersion system.
OM-228
Figure 4-2: Mounted Horizontally in Duct and
Lower Than HUMIDI-TECH Unit
Tee
OM-229
75 mm to 125 mm
(150 mm to 300 mm for
VM 25 and VM 34)
This is not recommended on VM10, VM12, VM16, VM25, and VM34.
IMPORTANT NOTES: When duct is located more than 3 metres away from unit,
vapor hose is not recommended; 40 mm minimum I.D. hard pipe should be used
instead. VM34 must use a multiple tube steam dispersion system.
OM-230
A water seal must be located in drain line as shown to maintain steam pressure.
VM34 must use a multiple tube steam dispersion system.
Locating and Mounting the HUMIDI-TECH®
Humidifier
The HUMIDI-TECH humidifier is designed to hang on
a wall, and should be installed in a space located near
an air duct system.
Consider the following when selecting the location of
the humidifier:
• Convenient access to duct
• Electrical and plumbing connections
• Required clearances
The mounting location should provide a minimum
clearance of 90 cm to the front and 60 cm to the right
side of the unit. This clearance is required for removing
the evaporating chamber and accessing electrical
compartment.
Electrical power supply, water make-up piping and
drain piping must also be considered. These service
Figure 4-3: Mounted Vertically (Optional)
150 mm
min.

5
INSTALLATION
Pre-moldedHigh
Temperature Resin Tubelets
15 mm O.D. Type 304
Stainless Steel Tubing
(condensate drain) *
OM-351
Movable Escutcheon
Plate (the escutcheon plate can adapt
the tube to ductwork 64 mm wider than
the designated insertion length.)
¼" coupling
80 mm
80 mm
65
mm
Figure 5-1: Single Tube
*15 mm diameter condensate tubing is not needed nor provided when steam flow is 15 kg/h
or less per dispersion tube. A minimum pitch of 64 mm per meter back to the humidifier
should be maintained.
80 mm
HUMIDI-TECH®Mounting Tube
with Condensate Drain Line
• Mount dispersion tube level.
• Orient dispersion tube so that tubelets
are pointed straight up.
Open Drain
25 mm Air Gap
Header Pitch 10 mm/m
(minimum)
150 mm
min.
125 mm min.
OM-224-r
Mounting Bracket
Escutcheon Plate
25 mm x 40 mm Stainless
Steel Channel
Dispersion Tube
Air Flow
Orificed Tubelets
Duct
Slip Coupling or Hose Cuff
Condensate Drain
Tube by Others
(20 mm) **
Figure 5-2: RAPID-SORB™ with Condensate Wasted to Floor Drain
Vapor Hose
or Rigid Tubing
80 mm Mounting
Bracket
** Condensate drain tubing material must be suitable for 100°C water.
Minimum condensate return line sizing:
• One or two tubes - 15 mm I.D.
• Three or more tubes - 20 mm I.D.
Insertion
Length

6
Connecting Dispersion Tube to Humidifier
• Connection can be made with vapor hose or rigid
tubing.
• Vapor piping should have a minimum I.D. of 40 mm.
• A minimum pitch of 15 cm/m back to the humidifier
should be maintained.
• Short sweep 90° elbows are not recommended; use
two 45° elbows 300 mm apart or long sweep 90°
elbows instead.
• Thin-walled tubing will heat up faster than heavy-
walled pipe, causing less steam loss at start-up.
• Insulating rigid tubing will reduce the steam output
loss caused by condensation.
• When mounting the humidifier above the level of
dispersion tube, see figure 4-2 on page 4.
Failing to follow these recommendations may result in
excessive back pressures being imposed on the
humidifier. This may lead to dispersion tube(s) spitting,
steam blowing through water seals, or leaking gaskets.
When the distance between humidifier and the disper-
sion tube(s) exceeds 6 metres, consult factory for
recommendations.
INSTALLATION

7
PIPING
Figure 7-1: Drain Adjacent to Wall Figure 7-2: Drain Through or in Wall
Mounting Bracket
Wall
Humidifier Drain Line
20 mm Hard Copper
OM-1006
Humidifier
Drain Valve
Humidifier Drain
Connection
20 mm Sweat
Union
Humidifier
Cabinet
Note: Locate the cabinet drain line exit away from
the humidifier drain line exit, if possible. This will
prevent water vapor from migrating up the cabinet
drain line, causing the cabinet bottom to rust.
Extending the cabinet drain line may also be effective.
Water make-up piping may be of any code-approved
material (copper, steel, or plastic). The final connection
size is 1/4". In cases where water hammer may be a
possibility, a shock arrestor should be considered
(water pressure 170 kPa minimum to 520 kPa maxi-
mum).
Drain piping may be of any code-approved material
(copper, steel, or plastic rated for 100°C minimum). If
drainage by gravity is not possible, a small lift pump
should be used.
The final connection sizes are 20 mm O.D. for evapo-
rator drain and 13 mm for cabinet drain. These con-
nection sizes should not be reduced. (See figures 7-1
and 7-2 for proper drain piping configurations.) The
evaporator drain and cabinet drain should be piped
separately to and discharged into a floor drain. Com-
bining the two drain pipes into a single drain line may
result in the backflow of drain water into the humidifier
cabinet, causing the unit to malfunction.
*Locate the drain funnel to the side and not directly below the humidifier.
Drain Piping Configurations
Humidifier Cabinet
Drain Connection -
½", Half Coupling
Cabinet Drain Line
10 mm Hard Copper
25 mm Air Gap Refer to
applicable
codes, allowing
minimum one
fixture unit per
humidifier, for
drain pipe sizing
requirements.
50 mm Appropriate
reducing
coupling
serves as a
funnel
OM-1005
Humidifier
Cabinet
Humidifier Cabinet
Drain Connection -
½ ", Half Coupling
Refer to applicable codes,
allowing minimum one
fixture unit per humidifier,
for drain pipe sizing
requirements.
Appropriate
reducingcoupling
serves as a
funnel*
25 mm Air Gap
Cabinet Drain
Line 10 mm Hard
Copper
50 mm
305
mm
Humidifier Drain
Line - 20 mm
Hard Copper

8
**Amp Draw Breaker Size
0-11.3 13
11.4-13.9 16
14.0-17.4 20
17.5-19.2 25
19.3-21.7 25
21.8-27.8 32
27.9-34.8 40
34.9-43.5 50
43.6-52.5 63
Conduit Size
(Ø mm)
**Amp Draw Incoming Wire Size 4 Conductor
and Ground*
AWG KcMIL (mm2)
0-10.0 14 2.5 32
10.1-13.3 12 4.0 32
13.4-20.0 10 6.0 32
20.1-33.3 8 10.0 40
33.4-43.3 6 16.00 40
43.4-56.7 4 25.0 50
Conduit Size (Ø mm)
**Amp Draw Incoming Wire Size 2 Conductor
and Ground 3 Conductor and Ground
AWG KcMIL (mm2)
0-12.5 14 2.5 20 25
12.6-16.7 12 4.0 25 32
16.8-25.0 10 6.0 25 32
25.1-41.7 8 10.0 32 32
41.8-54.2 6 16.0 32 40
All wiring must be in accordance with all
governing codes, and with HUMIDI-TECH®
or HUMIDI-TECH DI wiring diagram. The
diagram is located inside the removable front
panel on the right-hand side of the humidifier
cabinet. Power supply wiring should be rated
for 105° C temperature.
Refer to the amp draw on the rating plate,
and use the following tables to determine the
appropriate wire, conduit and fused
disconnect requirements.
When selecting a space to install the
HUMIDI-TECH, avoid areas close to sources
of electromagnetic emissions such as power
distribution transformers.
Figure 8-1: Field Wiring Requirements
OM-1007
Fused
disconnect,
sized per
tables
below.
HUMIDI-TECH Sub
Panel Power Block
Power supply
cable, sized
per tables
below.
WIRING
* For use with star wiring for 240V heaters used with 415V supply.
** Refer to Amp Draw on Rating Plate.
Table 8-1: Conduit and Wire Size
Table 8-2: Conduit and Wire Size
Table 8-3: Fuse/Breaker
Requirements
For maximum E.M.C. effectiveness, all humidity, temperature and air flow controls should be wired
using multi-conductor shielded plenum-rated cable with a drain wire for the shield. The drain wire
should be connected to the shield ground terminal with its length kept to less than 50 mm.
Sensor Wires
Drain Wire
(less than 50 mm)
Shield
Ground
To Control
Board
To Sensor
Figure 8-2: Shielded Cable Drain Wire Connection to Earth Bar
Control wiring and power wiring must be run in dedicated or separate earthed
metal conduit, cable trays or trunking.
GroundingRequirements:
The earth must be made by solid metal to metal connections. The ground must be
a good radio frequency earth. Ground wire should be same size as power wiring.
OM-1008
**Refer to Amp Draw on Rating Plate.

9
ELECTRICAL SPECIFICATIONS AND CAPACITIES/DIMENSIONS
Back View
Vapor Hose Opening 250 mm
400 mm
140 mm
600 mm 38 mm or (50 mm for
VM25 and VM34)
Connector Tube
600 mm
Water Fill
Valve ¼"
Water Fill
Line (not
supplied by
DRI-STEEM)
Key-lock Wall Hanging
Bracket
Electrical
Access
Panel
50 mm
Alternate water and
electrical access
through floor of unit
Drip Tray Drain ½"
Bottom View
Side View
Top View
OM-218
50 mm 85 mm
60 mm
70 mm
Drip Tray
Drain
Note: For models VM 16 and 25, dispersion tubes will
be equipped with a condensate tube when a hose kit is
used. See pages 4, 5 and 6 for installation details.
Table 9-1: Electrical Specifications and Capacities
Wall Mounting
Bracket
(shippedloose)
VM2 VM4 VM6 VM8 VM10 VM12 VM16 VM21 VM25 VM34
Operating
Weight 58 kg 60 kg 70 kg 71 kg 71 kg 73 kg 73 kg 48 78 kg 82 kg
Shipping
Weight 47 kg 50 kg 52 kg 53 kg 53 kg 54 kg 54 kg 26 kg 57 kg 61 kg
230V/1 8 16 24 31.9 39.9 47.9 -- -- -- --
kW 1.84 3.68 5.52 7.36 9.2 11.04 -- -- -- --
Output kg/h 2.5 5 7.5 10 12.5 15 -- -- -- --
400V/3 -- 8.7 13 17.3 15.2 17.3 23.1 30.3 36.1 49.1
kW 2 4 6 8 10 12 16 21 25 34
Output kg/h 2.7 5.4 8.2 10.9 13.6 16.3 21.8 28.6 34 46.3
Figure 9-1: HUMIDI-TECH® Unit Dimensions
(All measurements shown in millimetres.)

10
AREA-TYPE APPLICATION USING SPACE DISTRIBUTION UNIT (SDU)
The SDU converts a HUMIDI-TECH®duct humidifier
into an area-type humidifier. Instead of the steam
dispersion tube being located inside an air duct, the
dispersion tube is built into the fan unit. A fan draws in
room air and blows it across the dispersion tube,
where it absorbs the moisture and disperses it into the
room. The space distribution unit can be used on all
models. A condensate drain from the dispersion tube
is required on all applications (see figure
11-1 on page 11).
Mounting the SDU
The SDU may be placed directly on top of the
HUMIDI-TECH cabinet or mounted on a wall. A wall
mounting bracket and two 10 mm lag bolts are pro-
vided with each fan unit. (See page 4 for mounting
instructions.)
Rise and Carry
As steam is discharged from the humidifier, it quickly
cools and turns to a visible fog that is lighter than air.
As this fog is carried away from the humidifier by the
airstream, it tends to rise toward the ceiling. If this fog
contacts solid surfaces (columns, beams, ceiling,
pipes, etc.) before it disappears, it could collect and
drip as water. The greater the space relative humidity,
the higher and farther the fog will carry and rise in the
space before disappearing. The distance the fog
travels before it disappears is given in table 11-1 on
page 11.
This optional fan unit mounts on top of
the HUMIDI-TECH cabinet.
Air
Intake
Vents
Air
Discharge
Vent
OM-55
OM-56
If necessary, fan unit can be mounted on a
wall, allowing the HUMIDI-TECH to be
remotely located.

11
AREA-TYPE APPLICATION USING SDU
Table 11-1 lists the recommended minimum vertical
(RISE) and horizontal (CARRY) clearances for area-
type humidifiers at 50% and 60% RH of the space.
The SDU contains a 735 m3/h blower and a 300VA
transformer to power the blower (230/1/50). A wiring
diagram of the SDU is included with the unit.
On a call for humidity, the humidifier will begin produc-
ing steam and the start relay will energize the SDU
blower. The humidifier will continue to produce steam
until the humidistat is satisfied. The blower will con-
tinue to run until the time-delay switch shuts it off.
Once the SDU is mounted, panel access keys should
be removed and secured elsewhere.
Table 11-1: SDU Visible Fog Travel
* Rise: Height visible fog rises above discharge grill of humidifier.
** Carry: Horizontal distance visible fog travels from humidifier.
Surfaces cooler than ambient or objects directly in the path of visible
fog discharge may cause condensation and dripping.
¼" Coupling
¼" Drain Line (Not
Supplied by DRI-STEEM)
150 mm min.
75 - 125 mm Water Seal
Open Drain
25 mm Air Gap
OM-208
OM-54
735 m3/h Fan
Wall Bracket
Wall Bracket
(ShippedLoose)
13 mm Conduit
Knockout
125 mm
Steam
Inlet
Support
Foot
430 mm
Steam
Outlet
Condensate
Outlet
Figure 11-1: SDU Mechanical Detail
Figure 11-2: SDU Drain Detail
600
mm
260
mm 260
mm400
mm
50% RH 60% RH
Humidifier
Size Rise (m)* Carry (m)** Rise (m)* Carry (m)**
VM4 0.30 0.90 0.30 1.10
VM6 0.30 1.10 0.45 1.10
VM8 0.45 1.50 0.60 1.50
VM10 0.45 1.85 0.60 1.85
VM12 0.60 2.15 0.60 2.45
VM16 0.60 2.45 0.60 2.60
VM25 1.55 4.60 1.55 4.90
VM34 1.85 6.10 2.15 6.70

12
START-UPANDOPERATION
Introduction
Afterthesystemhasbeenproperlyinstalledandcon-
nectedto bothelectricalandwatersupplies, itmaythen
bestarted.
Start-upandCheckoutProcedures
Mounting
Checkmounting to seethattheunitis levelandsecurely
supportedbeforefillingwithwater.
Piping
Verifythatallpipingconnectionshavebeencompleted
asrecommendedandthatwaterpressureisavailable.
Electrical
Verifythatallwiringconnectionshavebeenmadein
accordancewithallgoverningcodesandtheenclosed
HUMIDI-TECH®wiringdiagram.
Caution: Onlyqualifiedelectricalpersonnel
shouldperformstart-upprocedure.
Asimplethree-probeconductivitysensorcyclesasole-
noid-operatedwaterfillvalvetomaintaintheproper
waterlevels.
LiquidLevelControls
Whenthepowerisfirstturnedon,thesolenoid-operated
waterfillvalvewillopen,fillingtheevaporatingchamber.
Fillingwillcontinueuntilwaterreacheslevel A, then after
atwo-seconddelay, thefillvalvewillclose. Toensure
thatawater seal is createdinthe overflow hose,
disconnectprobeplugandcablefromproberodassem-
bly(locatedon cover,) allowingthefillvalvetore-
energizeandoverfillhumidifiertank.Thisprocesswill
takeonlyseconds;probeplugandcablemustthenbe
reconnected.Acallforhumiditywillthenenergizethe
heatingelement.
WaterRefill
During operation, the water line will drop to level B. At
this time the fill valve will open, and will remain open
until the water line returns to level A.
Figure12-1: Electronic ProbeControl forMain-
tainingProperWaterLevel(HUMIDI-TECHOnly)
B
A
OM-211
C
HeaterProtection
ShouldthewaterlineeverdroptolevelC, the heaters
willde-energizeandremainOFFuntilthewaterlevelhas
beenrestoredtolevelC.Thisfeatureprovidesheater
protectionintheeventofalow-watercondition.
SurfaceSkimmer
Eachtimetheevaporatingchamberrefills,theupper
6mmofwaterisimmediatelydrainedoffthroughthe
skimmer.Thiscarriesawaythemineralresidueformed
duringthepreviousevaporatingcycle.Thisskimming
actioneffectivelyremovesmostofthemineralconcentra-
tioninmuchthesamewayasthesurfaceblowdown
doesinasteamboiler.Thissimpledevicegreatly
reducesthefrequencyofcleaningtheevaporating
chamber.
Drain/FlushFeature
Thiscontrolmodulecontainsanintegralelectronictimer
whichtracksthehumidifyingtimeoftheunit.Whenthis
accumulatedtimereacheswhathasbeensetinthe
timer,thedrain/flushcycleisactivated.
Uponactivation,thefollowingsequenceoccurs:
1. Thedrainvalveopensandbeginstodrainsurface
waterandmineralsfromtheevaporatingchamber.
2. Whenthe heightofthe water drops to the“REFILL”
level,the fill valve opens.
3. Thedrainandfillvalvesremainopenfortenmore
minutes,thusflushingthechamber.
4. Thedrainvalvethencloses,thechamberrefills,and
thefillvalvecloses.Thetimer begins to track the
timeastheunitresumesnormaloperation.
TestCyclingtheDrain/FlushSystem
Thetimerboardcontainsfourpairsofterminalpins
whicharemarked 20,40,80and“T”(TEST).To test:
1. Pull the pin block off the pair of pins in use, move it to
the “T” pair, and push it on.
2. Setthe humidistathighenoughsothatunit will remain
“on call” for at least one hour.
3. Afterabout35minutesofoperation,adrain/flush
cyclewilltakeplace.
4. Oncethetestcycleiscompleted,movethepinblock
back to the desired pair of pins. Failure to do so will
resultinadrain/flushcycleevery35minutes.

13
START-UPANDOPERATION
ControlCircuit
a) Adjusthumidistatto"call"setting.
b) Openshut-offvalveonwatersupplyline.Unitshould
begin filling with water through the fill valve.
c) Shortlybefore the fill valve shuts off, the heater cut-
offswitchwill"make".Whenthisswitchmakes,the
heatingelementcontactor(s)willbeactuatedaftera
ten-seconddelay.Atimedelayrelayprevents
contactorchatterduetobouncingofheatercut-off
float.
d) Checkheatercut-offcircuit.
1. Closemanualtopvalveonwatersupply.
2. Openball valveandstartdrainingunit.
3. Whenwaterleveldropspastswitchinglevelon
theheatercut-off float, theheating element
contactor(s)willdropout.
4. Whenstep3hasbeensatisfactorilycompleted,
closedrainvalve.
e) Checkfunctionoffield-installedsafetycontrols,
suchasthefanprovingswitch.Contactor(s)should
dropoutwhenanyprovingswitchis"open".
f) Checkheaterdrawbytestingandrecordingvoltage
andamperageineachphase.Readingsshouldmatch
nameplatereadings;nameplateislocatedonthe
humidifierhousing.
g) Inspectinstallationsforsteamorairleakswhile
operatingtheHUMIDI-TECH.Anyleaksshouldbe
sealed.
Caution: Allowunit tocoolbeforeperforming any
maintenance.Manuallyopenthedrainvalveandthefill
valve will be energized. Let the fill water run until the
tankis cooledthenshutoff thecontractorinstalled
supplywatervalve.
HUMIDI-TECH®
MineralPrecipitate
Asevaporationtakesplaceinastandard
HUMIDI-TECHunit,themineralsdissolvedinthewater
VAPOR-LOGIC®2
TheVAPOR-LOGIC2keypadallowstheadjustmentof
surfacewaterbleed-offamounttoaccommodatethe
watercondition.Thisadjustmentvariesthedurationof
theoverfill with each water fill cycle.
Theadjustableskimtimeallowsforanextendedperiod
oftime(2to40seconds)toreducesurfacemineral
accumulation.Inadditiontocontrollingthewaterlevel,
VAPOR-LOGIC2determineswhentheheatersare
energized.If thereisacall forhumidification,evenduring
thefill cycle, theheating elements willstay on to provide
continuousoutput.
Formoreinformationregardingtheoperationof
theVAPOR-LOGIC2microprocessor,seethe
VAPOR-LOGIC2InstallationInstructionsandMainte-
nanceOperationsManual.
LW415
Theelectronictimercomesfactory-setfordrainageafter
40hoursofoperationtime.Alternatesettingsof20hours
and80hourscanbemade.Seewiringdiagram(s)
attachedtothe unit fortimerboardlocationandinstruc-
tionsforchangingthetimersetting.
HUMIDI-TECH®
Make-upWaterPiping
Usecoldorhotmake-upwater.Ifthewater pressureis
above410kPaand/orwaterhammerwouldbeobjection-
able,apressure-reducingvalveorshockarrestershould
beinstalled.EventhoughtheHUMIDI-TECHhasan
internal25mmairgap,somelocalcodesmayrequirea
vacuumbreaker.
Important:Minimumwatersupplypressureis170kPa.
HUMIDI-TECHDI
Make-upWaterPiping
Inthisunittheelectronicprobecontrolis replaced by a
floatvalveand a floatoperatedlow water cut-offswitch.
Thebasicwaterlevelsystemandcircuitforheater
protectionin theeventofalow-waterconditioniscom-
mon to all DI humidifiers and can be found in the wiring
diagramlocatedinsidetheremovablefrontpanelonthe
right-handside of the unit.
Caution: Overtighteningcoverwillcauseleaks.
Allcover knobsareturneddownatthefactoryuntilthe
bottomofthe knobmakescontactwiththeflange, then
onehalfturnfurther.Ifmorecompressionisrequired,
turnallknobs a half turn more.Donotturnknobsmore
than a half turn before identifying that a leak still exists.

14
MAINTENANCE
comeoutofsolution and a portion oftheseminerals float
onthewater surface.Ifnotremoved,these
mineralswill eventuallyformasludgeandsettle tothe
bottomoftheevaporatingchamber.
Cleaningonceortwiceaseasonisusuallyadequate,
assumingthewaterhasa hardnessofupto250mg/l.
Todramaticallyreducemineralaccumulationinsidethe
evaporatingchamberusesoftenedwaterformake-up
watersource.Usingsoftenedwaterwillreducecleaning
frequencytoonceeveryseveralyearsinmostcases.
CleaningtheEvaporatingChamber
Theheatingelementitselfisselfcleaning.Themineral
builduponthe elementflakesoffafterreachinga
thicknessofabout 2 mm,and settles to thebottom of
thechamber.
Note: Beforethisscaleaccumulationbuildsuptothe
undersideoftheheatingelement,itmustberemoved.
Failuretodosomayresultinprematureheatingelement
burn-out.
ToService:
1. Shutoffelectrical power to the unit.Using the key,
unlockandremovethelargefrontpanel.Drainthe
evaporatingchamberbymanuallyopeningthe
“DRAIN”valve.Opentheleveronthevalveto
the“MANUAL”positionandlockinplace.
2. Disconnecttheconnectortubeontopofthe
evaporatingchamber,theflexiblehosefromthe
overflowpipe,andtheflexiblehosefromthedrain.
Installa rubber pluginto tank drainnipple. All
connectionsshouldberemovedontheevaporating
chamber.NOTE:DONOTDISCONNECTTHE
FLEXIBLEPOWERELECTRICALCONDUIT.
3. Disconnecttank-groundingwire.
4. Slidethe evaporating chamberoutoftheunitonthe
slidingtrack.Removethecoverofthechamber,
raise,andslideintoholdingslots.
5. Removetheevaporatingchamber,dumpoutmineral
residue.
6. Unscrewtheprobehousing,andremoveanymineral
build-upaccumulatedinthehousing.
7. Cleantheprobe-rodassembly.Scrapeoffbuild-up
onrodtips and brushwithsandpaperorsteelwool
toremovemineralresidue.
8. Replacechamberontotheslidingtrack.
9. Securethechambercovermakingsurethechamber
issealed.Pushchamberback intotheunitonthe
slidetrack.
10.Reconnectthetubeandslipcoupling,theoverflow
hose,thedrainhose,andconnecttank-grounding
wire.
11.Movedrainvalveleverbackto“AUTO”.
12.Replace the front panel and lock. Turn on the
electricpower.HUMIDI-TECHisagainreadyto
humidify.
OffSeasonShut-Down
1. Switchoffelectricalpower.
2. Shutoffwatersupplytomake-upvalve.
3. Drainevaporationchamber,andcleanifnecessary
(see“CleaningtheEvaporatingChamber”above).
4. Leavechamberdry,thepower“OFF,”andthewater
shut-offvalvecloseduntilthenexthumidification
season.
HUMIDI-TECHDI
TheHUMIDI-TECHDIunitusesDI/ROwater.Because
thesewatertypesaremineral-free,cleaningtheevapo-
ratingchambershouldnotbenecessary.However,there
aresomesimplemaintenancestepsthatshouldbe
followed to ensure all parts of the unit are in good
workingorder.
ToService:
1. Shutoffelectricpower.
2. Shutoffwatersupplytomake-upvalve.
3. Unlockandremovefrontpanel.
4. Makesuretheevaporatingchamberisdrainedby
manuallyopeningthedrainvalve.
5. Checktheconditionoftheoverflowanddrainhoses.
6. Removetheevaporatingchamberasfollows:
Disconnecttheflexibleconnectortubeontopofthe
evaporatingchamber,theflexibleoverflowhose,
andtheflexibledrainhose.Allconnectionsshould
beremovedattheevaporatingchamber.NOTE:DO
NOTDISCONNECTANYOFTHEELECTRICAL
CONDUITS.
7. Slidetheevaporatingchamberforwardonthetrack.
Removethecoverofthechamber,raiseandslide
intoholdingslots.

15
MAINTENANCE
8. Checkoperationofthefloatvalve,inspectvalveseat
andheatercut-off.
9. Inspecttheheatingelements.Replaceif
inoperative.
10. Inspecttheevaporatingchamber.Cleanif
necessary.
11. Replacethechambercoverandslidechamberback
into unit.
12. Reconnectconnectortubeandflexiblehoses.
13. Returndrainvalvehandletoclosedposition.
14. Replacefrontpanelandturnonelectricpower.
15. HUMIDI-TECH®DIisagainreadytohumidify.
Off-SeasonShut-DownProcedure
1. Switchoffelectricpower.
2. Removefrontpanel.
3. Shutoffwatersupplytomake-upvalve.
4. Drainevaporatingchamberbymanuallyopeningthe
drainvalve.
5. Replacefrontpanel.
6. Leavechamberdry,thepower“OFF”,andwater
shut-offvalvecloseduntilthenexthumidification
season.

16
CONTROL PANEL
LIGHTS
PROBLEM FILL READY DRAIN POSSIBLECAUSE RECOMMENDEDACTION
WATER
Humidifierwill Off Off Off Controltransformer Verifycontrolvoltageacrosssecondary
notheat leadsoftransformer. Resettransformer
circuitbreaker.
Off On Off Humidistatisnotcalling Sethumidistattocall.Inspectforfaulty
humidistat.
Safetycontrolsopen Checksafetycontrols,airflowswitch,high
limithumidistat,etc.
Faultycontrolboard Verifycontrolvoltagebetweenterminals
H&N.
Probeheaddeterioration* Replaceprobehead.
Humidifierwill On Off Off Nowaterpressureatvalve Checkwatersupply/shutoffvalves.
not fill Faultywaterfillvalve Verifyactionoffillwatersolenoidvalveby
turningcontrolmoduleswitchfrom
standbytonormalop.Audibleclickshould
beheardassolenoidoperates.
Pluggedstrainer Checkstrainer.
Pluggedvalve Checkvalve.
Faultycontrolboard Verifycontrolvoltageacrossterminals
H&N.
Humidifierdoes On Off Off Lackoftanktoprobes Jumperwiresbrowntoyellow.Ifwater
notstopfilling electricalcontinuity.Water stops,verifytankground;checkwater
conductivity100μS/cm supplyconductivity;thenconsultfactory.
(35mg/l)min.
Fillvalveisstuckopen Checkvalveforforeignmatter.
Drainvalvenotclosed Checkforcorrectwaterflow,through
Fillvalveinstalledbackward valve,notearrow.
On Off On Auto-drainmode Waitforautosequencetoend.
Lowoutput Off On Off Electricdrainvalvenot Correctcauseofleakageorreplacevalve.
seating
Off On Off Fillvalveisstuckopen Checkvalveforforeignmatter.
Unit short cycles On&Off On Off Probesmaybeincorrectly Confirmthatunitiswiredperdiagram.
wiredorneedcleaning Cleanproberodtipswithsteelwool.
Reducedorno Off On Off Heatermalfunctioning Verifythatpropervoltageisbeingapplied
outputeven toheaters.Checkheater(ampdrawand
thoughwater comparetowiringdiagramratings).
isattheproper
level Malfunctioningcontrol Heatercontactornotfunctioning;replace.
system Servicefusesblown.Auxiliarylimit
controlsnotallowingsystemtooperate
(ducthumidistat,airflowprovingswitch,
etc.). Reset,replaceorcalibrateas
required.Faultyorinaccuratehumidistat,
replaceorcalibrate.
HUMIDI-TECH®TROUBLE-SHOOTINGGUIDE
*Probe rod corrosion or probe head material aging may cause level control system failure.
This generally does not occur in the first two years of operation.

17
HUMIDI-TECH®DITROUBLE-SHOOTINGGUIDE
PROBLEM
Humidifierwill
notheat
Humidifierwill
notfill
Waterfloat
valvedoesnot
close
Reducedorno
outputeven
thoughwateris
attheproper
RECOMMENDEDACTION
Verifycontrolvoltageacrosssecondaryleadsof
transformer.Resettransformercircuitbreaker.
Sethumidistattocall.Inspectforfaultyhumidistat.
Checksafetycontrol,airflowswitch,highlimit
humidistat,etc.
Verifycontrolvoltagefromfloatswitchandtransformer
secondarycommon.
Checkmanualwatersupply.Valve,minimum200kPa
waterpressure.
Checktomakesurethatvalvefloat&steammoves
freely.
Checkfloatvalveseat.
Obstructionindrainvalvewillnotallowcomplete
closure,cleanorreplacevalve.
Closedrainvalve.
Floatballhaswaterleak.Floatvalveseatdefective,
replace.
Readjustfloatvalverod,sowaterlevelreaches5-10mm
fromoverflowedgewhenwaterisatambientorcold
state.Excessivewaterpressure,680kPamaximum.
Obstructionwillnotallowfloatvalvetoseatproperly,
cleanorreplacewithnewseat.
Verifythatpropervoltageisbeingappliedtoheaters.
Checkheaters(ampdrawandcomparetowiring
diagramratings)
Heatercontactornotfunctioning,replace.Servicefuses
blown.Auxiliarylimitcontrolsnotallowingsystemto
operate(ducthumidistat,airflowprovingswitch,etc.).
Reset,replaceorcalibrateasrequired.Faultyor
inaccuratehumidistat,replaceorcalibrate.
Delaytimeisfactorysetat10-15seconds.Checkdelay
setting.
Checkforproperoperation.
READY
WATER
Off
Off
On
On
POSSIBLECAUSE
Controltransformer
Humidistatisnotcalling
Safetycontrolsopen
Lowwaterfloatswitch
Nowaterpressureatvalve
Malfunctioningwaterfloatvalve
Pluggedfloatvalve
Opendrainvalve
Manualdrainvalvenotclosed
Malfunctioningfloatvalve
Waterpassingintooverflow
standpipe
Floatvalvestuck
Heatermalfunctioning
Malfunctioningcontrolsystem
Timedelay/interlockrelays
Lowwatercut-offswitch

18
REPLACEMENTPARTS
OM-214A
VM - 2, 4, 6, 8, 10, 12, 16
VM - 25 and 34
Figure18-1:HUMIDI-TECH®

19
REPLACEMENTPARTS
Table19-1: HUMIDI-TECH® (seefigure18-1)
No. Description Qty. Part No.
1 Tank 1 160012*
2 Cover 1 *
3 Thermo Cut-Out 1 409560-001
4 Cover, Heater Terminal 1 160750*
5 Gasket, Cover 1 160695*
6 Heater * 409600*
7 Knob, T-Handled Utility 4 700725
8 Connector, 10mm flex. 1 407127-038
9 Valve, Solenoid Fill 1 505084
10 Orifice, Fill Valve 1 160225*
11 Gasket, Probe 1 309750-003
12 Probe Assembly 1 *
13 Probe Plug Wire Assembly, 610mm 1 406050*
14 Drain Assembly 1 180520*
15 Valve, Electric Drain 1 505400-001
16 Hose, Overflow * 307020-002
17 Spring, Overflow Hose 1 307025
18 Hose Clamp, 19mm ID 4 700560-075
19 Probe Housing, Nylon 1 308500
20 Hose, 13mm Fill (533mm Long) * 307020-001
21 Hose Clamp, 13mm ID 2 700560-001
22 Duro Strip, 279mm Nylon 2 309980
23 Hose, Drain * 307020-002
24 Stopper, Rubber (not shown) 1 309960
25 Slip Coupling with O-Rings, 38mm (VM 2, 4, 6, 8, 10, 12, 16) 1 162726-001
26 Hose Cuff, 51mm ID x 76mm (VM 25, 34) 1 305391-0030
27 Hose Clamp, 51mm ID (VM 25, 34) 2 700560-200
28 Panel Weld, Front 1 160310-100
29 Cover Weld, Electrical 1 160320-100
30 Bracket, Electrical Cover Key Lock 1 120746
31 Display Board, JPC LW440 1 408651
32 Wall Bracket 1 160150-101
33 Lock, Key 2 700700
34 Connector Weld 1** 160350*
35 Light, Amber (FILL) 1 409520-003
36 Light, Green (READY WATER) 1 409520-002
37 Light, Red (DRAIN) 1 409520-001
38 Nipple, x 50 mm 1 250210-002
39 Nipple, Brass Close 1 250013
40 Strainer, ¼" Sediment 1 300050
* Specify humidifier model and serial numbers when ordering.
** Shipped loose except with bonding bracket.

20
REPLACEMENTPARTS
OM-215A
VM - 2, 4, 6, 8, 10, 12, 16
VM - 25 and 34
Figure20-1:HUMIDI-TECH®DI