DriSteem Vapormist, Humidi-tech, CRUV Service Kit Manual

Vapormist

Humidi-tech

Electric Humidifiers,

Standard Water

Service Kit Manual

®

, and CRUV

®

,

®

WARNING

Indicates a hazardous situation that could result in death or
serious injury if instructions are not followed.

Read all warnings and instructions

This page provides important safety instructions; it is intended to supplement — not replace — the humidifier's Installation, Operation, and
Maintenance Manual (IOM). Read the IOM that was provided with the humidifier before performing service or maintenance procedures
on any part of the system. Failure to follow all warnings and instructions could produce the hazardous situations described here and in the
IOM, resulting in property damage, personal injury, or death.

If the IOM is missing, go to http://www.dristeem.com/ds_lit.jsp to download a replacement. mc_071608_0910

Hot surfaces and hot water

Steam humidification systems have extremely hot surfaces, and water in tanks, electrode cylinders, steam pipes, and dispersion assemblies
can be as hot as 212 °F (100 °C). To avoid severe burns, allow the entire humidification system to cool.

Follow the cool-down procedure in the humidifier's IOM before performing service or maintenance procedures on any part of the system.

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Shut down the energy source

Before performing service or maintenance procedures on any part of the humidification system, verify that all energy sources are off.
Energy sources can be electricity, gas, steam, or hot liquid. Failure to shut down the energy source could result in carbon monoxide
poisoning, fire, explosion, electrical shock, and other hazardous conditions. These hazardous conditions could cause property damage,
personal injury, or death.

Contact with energized circuits can cause property damage, severe personal injury or death as a result of electrical shock or fire. Do not
remove the shroud/cover, electrical panel cover/door, access panels, or heater terminal cover until electrical power is disconnected.

Follow the shutdown procedure in the humidifier's IOM before performing service or maintenance procedures on any part of the system.
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CAUTION

Indicates a hazardous situation that could result in damage to
or destruction of property if instructions are not followed.

WARNING

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Electrical shock hazard

If the humidifier starts up at a call for humidity during maintenance, severe bodily injury or death from electrical shock could occur. To
prevent such start-up, follow the procedure below before performing service or maintenance procedures on this humidifier (after the tank
has cooled down and drained):

1. Use the Vapor-logic®3 or Vapor-logic4 keypad to change the control mode to Standby.

2. Shut off all electrical power to the humidifier using the field-installed fused disconnect, and lock all power disconnect switches in the
OFF position.

3. Close the field-installed manual water supply and gas shut-off valves. mc_050808_1530

Damage from hot discharge water

Discharge water can be as hot as 212 °F (100 °C) and can damage the drain plumbing.
If the humidifier is equipped with a water tempering device such as a DRI-STEEM Drane-kooler™, it needs fresh make-up water in order to function

properly. Make sure the water supply to the Drane-kooler remains open during draining.
If the humidifier is not equipped with a water tempering device, allow the tank to cool before opening the drain valve. mc_111308_1345

Parts in this service kit are for VM99, HT99, and CRUV99 humidifiers (August 1999 to present). Parts are listed on page 2.

CAUTION

Vapormist/Humidi-tech/CRUV, standard water, service kit parts

VM99 / HT99 / CRUV99, standard water, 2 to 4 kW
Service Kit No. 900100-001

No. Part Description Part No. Qty.

1 Probe tool (see Probe Tool inset) 406201 1

2 Silicone, clear (not shown) 320000 1

3 Sediment screen (see Fill Valve inset) 300051 1

4 Cover gasket 160695-001 1

5 Probe gasket 309750-004 1

6 Bulkhead drain gasket (Vapormist/Humidi-tech only) 309750-005 1

7 Probe rod assembly 406303-005 1

8 Probe housing 308500 1

VM99 / HT99 / CRUV99, standard water, 6 to 34 kW
Service Kit No. 900100-002

No. Part Description Part No. Qty.

1 Probe tool (see Probe Tool inset) 406201 1

2 Silicone, clear (not shown) 320000 1

3 Sediment screen (see Fill Valve inset) 300051 1

4 Cover gasket (Vapormist/Humidi-tech only) 160695-002 1

5 Probe gasket 309750-004 1

6 Bulkhead drain gasket 309750-005 1

7 Probe rod assembly 406303-006 1

8 Probe housing 308500 1

Page 2 • DRI-STEEM Vapormist/Humidi-tech/CRUV, Standard Water, Service Kit Manual

Vapormist/Humidi-tech/CRUV, standard water, service kit parts

This service kit contains the replacement parts called out in the
parts drawing to keep your DRI‑STEEM humidifier operating
at peak performance. This Service Kit Manual provides
important safety and service instructions; it is intended to
supplement — not replace — the humidifier's Installation,
Operation, and Maintenance Manual. Please see Read all
warnings and instructions on page 1.

While performing service and maintenance procedures,
replace existing parts with the new parts provided in the
service kit.

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Enclosure Screw Cap

(Vapormist/Humidi-tech)

Note: Components may by oriented

differently than shown in drawing.

OM-778-3

Probe Tool

Torque probe assembly
to 10 ft-lbs (13.6 N-m).

3/8" drive

1

OM-7395X

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Fill Valve

3

Sediment screen (3)

inside of Tee

TANKASM-VM2-4X

Apply clear silicone (2) to both sides of gasket.

See Fill Valve inset.

Vapormist/Humidi-tech only

6

4

7

5

8

OM-768X

DRI-STEEM Vapormist/Humidi-tech/CRUV, Standard Water, Service Kit Manual • Page 3

Vapormist/Humidi-tech/CRUV, standard water, service instructions

Inspection and maintenance

Cool down humidifier

Before performing service or maintenance procedures, allow
the tank to cool down. Insulated and uninsulated tanks will
have hot surfaces

Note: Fresh make‑up water is used to speed up cooling. Do

not close the manual water supply before cooling down
the humidifier; otherwise the tank could stay hot for
several hours.

1. Verify that there is no call for humidity and that the
aquastat set point (adjusted using the keypad/display Setup
screens) is less than room temperature (default setting
is 40 °F [4 °C]) so that the heaters do not energize while
cooling down the tank.

2. Verify that the tank is in Auto mode so it will fill after
draining begins.

3. Drain the tank:
a. Manually open the drain valve by moving the valve

lever located on the back of the drain valve to the
manual open position. The fill valve will open after
enough water has drained out of the tank.

b. Let the fill water run until the tank is cooled; then shut

off the field‑installed manual supply water shut‑off
valve.

c. Let the tank drain; then manually close the drain valve.

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Shut down humidifier

Follow the procedure below before performing service or
maintenance procedures (after the tank has cooled down and
drained):

1. If the humidifier is equipped with a Vapor‑logic3 controller,
use the keypad to change the control mode to Standby.

2. Shut off all electrical power to the humidifier using
the field‑installed fused disconnect, and lock all power
disconnect switches in the OFF position.

3. Close the field‑installed manual water supply shut‑off valve.

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Annually (also recommended when maintenance is performed)

1. All safety devices in the control circuit should be cycled on
and off to verify they are functioning. These include:

• Highlimitswitch

• Airflowprovingswitch

• Lowwaterlevelprobe.Pulloutprobeplug;fillvalve

should energize.

2. Measure current draw of heaters and verify amp values per
stage by comparing to the wiring diagram located inside
the subpanel cover. This identifies any burned out heaters.
Only qualified electrical personnel should perform this
task.

3. Inspect tank and gaskets for leaks.

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Seasonally (or as required, depending on water quality)

Clean the evaporating chamber. See the facing page of this
Service Kit manual for Vapormist instructions; see the back
page for CRUV instructions.

Off-season maintenance

Perform complete inspection and cleaning of the following:

• Heaters

• Proberods

• Skimmerportandwaterseal

• Humidifiertank

After cleaning, the humidifier should remain empty until
humidification is required.

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Note: Steps 4 and 7 below apply only to Vapormist humidifiers.

Off-season shut-down procedure

1. If the tank is hot, cool it down first. See cool‑down
instructions at left.

2. Drain evaporating chamber.

3. Switch off electrical power.

4. Remove enclosure.

5. Shut off water supply to makeup valve.

6. Examine the evaporating chamber (see facing page of this
Service Kit manual), and clean if necessary.

7. Replace enclosure.

8. Leave chamber dry, power off, and the water shut‑off valve
closed until the next humidification season.

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Page 4 • DRI-STEEM Vapormist/Humidi-tech/CRUV, Standard Water, Service Kit Manual

Vapormist/Humidi-tech/CRUV, standard water, service instructions

Vapormist service

1. Remove the evaporating chamber:
a. Remove the two fasteners on each side of the cover

enclosure (see Enclosure Screw Cap inset on page 3)

b. Remove the enclosure.

WARNING!

Do not remove the humidifier electrical panel cover or the
heater terminal cover until electrical power is disconnected.
Contact with energized circuits can cause property damage,
severe personal injury or death as a result of electrical shock.

c. If the Vapormist has an SDU mounted directly above it,

the SDU cover must be removed before removing the
humidifier cover.

d. If the tank is hot, cool it down first (see cool‑down

instructions on facing page).
e. Shut off the water supply.
f. Allow the tank to drain completely.
g. Shut off the electrical supply.
h. Disconnect the fill line at the supply side of the fill

valve.
i. Disconnect the electrical plugs between the tank

components and the back of the electrical panel

(includes: power plug, fill plug, drain plug, water level

control plug, tank temperature sensor plug and thermal

trip plug).
Important: Disconnect by pulling on plug

housing. Do not disconnect by pulling on cord or

wires.
j. Disconnect the drain union on the back left corner of

the frame.
k. Disconnect the steam supply hose from the top of the

tank.
l. Lift the tank foot above the frame flange and slide the

tank assembly forward to remove.

2. Loosen the four cover bolts and remove the cover assembly
from the tank.

3. Clean the tank interior using a putty knife or similar flat
instrument.

4. Clean the probes:
a. Unplug probe plug assembly. Leave ground wire

connected to tank.

b. Unscrew the probe rod assembly using the probe tool

connected to a 3/8" square drive.

c. Inspect the probe housing and clean, ensuring that all

the housing passageways are clear. Remove the housing
from the holding bracket by sliding the housing
horizontally toward the open end of the bracket.

• Thescaleshouldflakeoffeasilyfromtheprobe

assembly rods.

• Thebottom3/8"(10mm)ofeachrodisthesensing

portion; clean these areas with a wire brush,
abrasive pad, or steel wool.

d. Inspect the composite plastic probe rod assembly for

any signs of cracking, roughness, or deterioration. If
found, replace probe assembly.

e. Reassemble and install the probe and probe plug

assembly. Verify ground wire is solidly connected to
tank.

5. Secure the chamber cover, making sure the cover gasket is
seated and the chamber is sealed.

6. Re‑install the evaporating chamber:
a. Reconnect the fill line.
b. Reconnect the electrical plugs (plugs are color coded).
c. Reconnect the drain union.
d. Reconnect the vapor hose.

7. Verify electrical connections:
a. Verify that all DIN rail‑mounted components are

securely fastened to DIN rail.

b. Verify that all power terminal screws and lugs are tight

from power block to heaters. See the table below for
torque specifications.

Table 5-1:
Vapormist torque specifications

Screw or lug location

Power block 16 1.8
Contactor 16 1.8

Heater
nut

Heater
wire lug

8-32 (8.5 mm) nut 20 2.2
10-32 (9.5 mm) nut 25 2.8
6 gauge (10 mm2) wire 35 4.0
8 gauge (6 mm2) wire 25 2.8
10-14 gauge (<6 mm2) wire 20 2.2

Torque

inch - lbs N-m

c. Verify that all plugs located under the humidifier cover

are completely plugged in.

8. Move the drain valve lever back to the auto position.

9. Turn on the water supply.

10. Turn on the electrical power.

mc_060208_1055

DRI-STEEM Vapormist/Humidi-tech/CRUV, Standard Water, Service Kit Manual • Page 5

Vapormist/Humidi-tech/CRUV, standard water, service instructions

Humidifier De-scaling Solution

Scale buildup on humidifier heaters
acts as an insulator, reducing humidifier
performance while increasing energy
costs. To keep humidifiers operating as
efficiently as possible, remove scale with
DRI-STEEM's Humidifier De-scaling Solution,
available for purchase from your DRI-STEEM
representative or distributor.

The De-scaling Solution cleans without risk
of corroding humidifier tanks or welds. The
De-scaling Solution also cleans surfaces
unreachable by hand scraping.

DRI-STEEM's Humidifier De-scaling Solution
is the only approved cleaner/de-scaler for
use with DRI-STEEM humidifiers. Use of
other cleaners/de-scalers may void your
DRI-STEEM warranty.

mc_021908_1410-elec

DRI-STEEM Corporation

An ISO 9001: 2000 certified corporation
U.S. Headquarters:

14949 Technology Drive
Eden Prairie, MN 55344
800-328-4447 or 952-949-2415
952-229-3200 (fax)

European office:
Marc Briers
Grote Hellekensstraat 54 b
B-3520 Zonhoven
Belgium
[phone] (voice)
[phone] (fax)
E-mail: [e-mail]

Continuous product improvement is a
policy of DRI-STEEM Corporation; therefore,
product features and specifications are
subject to change without notice.

DRI-STEEM, Vapormist, Humidi-tech, CRUV,
and Vapor-logic are registered trademarks
of DRI-STEEM Corporation and are filed for
trademark registration in Canada and the
European community.

Drane-kooler is a trademark of DRI-STEEM
Corporation.

CRUV Service

1. Drain the tank. See Step 3 on page 4.

2. Clean the probes. See Step 4 on page 5.

3. Remove the tank cover and wet vac minerals out of tank
(recommended).

4. To remove tank for cleaning, disconnect drain line union, fill valve
supply line, electrical connections to drain, (disconnecting field
wiring in conduit is NOT recommended,) thermal trip, heaters,
fill valve, and probe. Disconnect steam hose from top of tank and
remove mounting bracket fasteners.

5. Remove evaporating chamber and clean.

6. Install the probe and probe plug assembly. Verify that ground wire is
connected.

7. Replace tank cover, making sure tank is sealed tight.

8. Reconnect drain line union, fill valve supply line, electrical
connections to drain, thermal trip, heaters, fill valve, and probe.
Connect steam hose to top of tank.

9. Verify drain valve lever is in AUTO position.

The CRUV humidifier is again ready to humidify.

mc_060208_1100

Mineral precipitate

As evaporation takes place in the humidifier, some of the minerals
dissolved in the water precipitate out and float on the water surface. The
minerals not removed by the skimmer will settle to the bottom of the
evaporating chamber.

Cleaning the evaporating chamber

The heating element is self‑cleaning. The mineral buildup on the element
flakes off after reaching a thickness of about 1/16" (2 mm), and settles to
the bottom of the chamber.

Long heater element life can be expected when the operation of the
humidifier is observed for a few weeks following initial start‑up. By
observing the mineral build‑up rate, the frequency of both drain/flush

use and manual cleaning can be determined and adjustments made.

CAUTION

Before this mineral scale builds up on the underside of the heating
element, it must be removed. Failure to do so could result in premature

heater burnout.
The humidifier is designed for convenient cleaning and maintenance.

mc_052708_1130

Start-up

Perform the Annual safety checks in the Inspection and maintenance
section on page 4.

If resuming operation after service, do not leave the humidifier
unattended; allow it to cycle through multiple fill cycles to verify that all
serviced parts are functioning properly. See the humidifier's Installation,
Operation, and Maintenance manual for start‑up details.

mc_052908_1005

© 2011 DRI-STEEM Corporation

Form No. VM/CRUV-standard-SKM-0711

Page 6 • DRI-STEEM Vapormist/Humidi-tech/CRUV, Standard Water, Service Kit Manual

Part No. 891000-001 Rev C

DRI-STEEM products are warranted according to the terms and conditions of the standard
two-year Limited Warranty effective when the humidifier was purchased. See the literature
that was shipped with the humidifier for warranty information.

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