DriSteem CRU SERIES Installation Instructions And Maintenance Operations Manual
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DRI-STEEM
®
CRU SERIES
ELECTRIC STEAM HUMIDIFIERS
Installation Instructions
and
Maintenance Operations Manual
UL RECOGNIZED
COMPONENT
For Toll-Free Customer Support,
Call: 1-800-328-4447
CUL RECOGNIZED
COMPONENT
TABLE OF CONTENTS
TO THE PURCHASER AND THE INSTALLER
Thank you for purchasing our CRU® Series humidification equipment. We have designed and built this equipment to
give you total satisfaction and many years of trouble-free service. Proper installation and operating practices will
assure you of achieving that objective. We therefore urge you to become familiar with the contents of this manual.
DRI-STEEM Humidifier Company
CRU Series Humidifiers ............................................................ 3
Installation..................................................................................4
Specifications, Capacities, and Dimensions .......................... 6
Start-up and Operation ............................................................. 8
Maintenance ............................................................................... 10
Trouble-Shooting Guide ........................................................... 11
Replacement Parts..................................................................... 13
Maintenance Service Record .................................................... 19
Two-Year Limited Warranty ...................................................... 20
2
CRU® SERIES HUMIDIFIERS
Figure 3-1: The CRU Humidifier
Figure 3-2: The CRUV Humidifier
(CRUV 2-16 shown, CRUV 25, 34 not shown)
Over Flow
Electrical Conduit
Heater Terminal
Cover
Probe
Electric Drain Valve
Strainer
Fill Valve
Cover Knob
Cover
Steam
Output
OM-771
Steam Output
Heater Terminal Cover
Cover Knob
Over Flow
Electric Drain
Strainer
Probe
Cover
Fill
Valve
Heater
OM-770
CRU Series Humidifiers
This humidifier is designed to be used with either softened or unsoftened water (softened water will greatly reduce
humidifier maintenance and improve overall system performance). The probe-type level control system requires
water conductivity of at least 100 micromhos/cm (2 grains/gal) to function, and therefore, will not operate with
demineralized water. For humidification using demineralized water, see CRUV®-DI below.
Figure 3-3: The CRUV-DI Humidifier
(CRUV-DI 2-16 shown, CRUV-DI 25, 34 not shown)
Heater Terminal Cover
Steam Output
Over Flow
¾" SST
Ball Valve
Water Supply Pipe
Electrical Conduit
Cover Knob
Heater
CRUV®-DI Humidifiers
The evaporating chamber of this humidifier is
constructed of corrosion-resistant stainless steel alloy
to resist the corrosive effects of mineral-free water.
Since the CRUV-DI humidifier is designed for use with
deionized or RO demineralized water, there is no need
to clean the unit, although an annual inspection of the
evaporating chamber is recommended.
Cover
Float Valve
Float
Cut-off
Switch
OM-772
3
INSTALLATION
Locate the CRU® humidifier near an electric power source,
water supply and a drain.
In an Air-Conditioning Unit
When installing a humidifier inside an air conditioning unit,
provide adequate support; allow easy access for removing
and servicing the evaporating chamber, and provide
adequate clearance to install the vapor hose and dispersion tube (see figure 4-1).
In a Duct
When installing the dispersion tube in a duct, allow for a
continuous pitch of the vapor hose back to the evaporating
chamber. Otherwise, use a water seal and drain (see
examples in figures 4-2 and 5-1). The dispersion tube can
also be placed vertically in the duct with some models
(see figure 5-2).
Place the electrical sub-panel in a grounded protective
metal enclosure and mount in a dry and accessible
location.
If draining the evaporating chamber by gravity is not
possible, use a small condensate lift pump, rated to pump
212° F water.
Examples of Installation in an Air Stream
Figure 4-1: Installation in an Air-Conditioning Unit
Electrical Conduit
Water Supply Pipe
Figure 4-2: Horizontal Dispersion Tube
Duct
Vapor Hose
OM-773
Horizontal mounting of dispersion tube in a duct, connected via vapor hose to
a wall-mounted CRU Series humidifier.
Drain Pipe
OM-830
4
INSTALLATION
Piping
Water make-up piping should be of corrosion-resistant,
code-approved material (copper, steel, or plastic). The
final connection size is ¼" NPT. In cases where water
hammer is possible, a shock arrestor should be
considered.
Drain piping should be of code approved material
(copper, steel, or plastic rated for 212°F minimum). The
¾" O.D. copper sweat connection should not be reduced
in size.
If there is no sewer available for drainage, the unit can
be piped for manual drainage. Consult factory for instructions.
Wiring
The CRU
®
is designed for a single source of electric power
supply. Wiring must meet all electrical codes, the current
characteristics, and capacity requirements should be
checked against the nameplates. The electrical subpanel
should be mounted in a location convenient for service.
Wiring must be in accordance with all governing codes,
and with the humidifier wiring diagram. The diagram is
shipped loose with the unit. The wiring between the
control cabinet and humidifier must be
rated at 105°C.
Figure 5-2: Vertical Dispersion Tube
Duct
OM-775
The dispersion tube can be mounted vertically in the duct.
Note: When dispersion tube is more than 10 feet from unit,
insulated, 1½" diameter minimum rigid tubing or pipe should
be used instead of vapor hose. This application is not
recommended for CRUV-16, -25, and -34.
Figure 5-3: RAPID-SORBTM Rapid Absorption Tube
Bank
Caution: Only qualified electrical personnel
should perform installation procedures.
Figure 5-1: Horizontal Dispersion Tube Lower Than
Humidifier
Duct
Tee
3"-5"
Water Seal
OM-774
When horizontally mounting the dispersion tube in an air
stream that is located lower than the CRU Series humidifier a
water seal (to prevent steam from escaping at the open drain)
must be provided in the drain line and line extended to open
drain, as shown, to drain the condensate. A multiple
dispersion tube bank must be used with CRUV-34
because of its high output (see figure 5-3).
Duct
When rapid absorption is extremely critical, a RAPID-SORB
multiple-tube bank can provide 100% steam absorption within
three feet or less - at any duct temperature. Also required for
CRUV-34.
For complete information on calculating the number of
dispersion tubes required to satisfy steam absorption distance
requirements, consult your sales representative, the
DRI-STEEM factory, or use DRI-STEEM's DRI-CALC® II
Humidification Sizing and Selection Software.
TM
5
SPECIFICATIONS, CAPACITIES, AND DIMENSIONS
CRU Series
Mechanical/Electrical Specifications
Side Elevation
.25 DIA
A
E
Table 6-1: CRU Dimensions (in inches)
OHGR0$%&'(
4&2-URC
8&6-URC
.ni52.1157.705.805.2152.12
mm582591512513045
.ni52.4157.705.905.3152.42
mm063591042543516
C
.375" TYP
OM-282
End Elevation
D
4.25"
1.75"
OM-283
B
NOTE: The "CRU" differs from the "CRUV" in evaporating chamber size,
heater KW and arrangement of drains and overflow plumbing.
Table 6-2: CRU Mechanical/Electrical Specifications and Capacities
85& 85& 85& 85&
UXRKWXSWX2
JNODJVEO
WZJQLWDUHS2
JNVEO
WZJQLSSLK6
JNVEO
WDVSP$
°Y
°Y 6.92.918.825.83
°Y 0.80.610.429.13
°Y 3.87.610.523.33
°Y 2.43.85.217.61
°Y 3.37.60.013.31
°Y -**7.61**0.52**3.3
°Y -**4.41**7.12**9.82
°Y -**7.8**0.31**3.71
°Y -**2.7**8.01**4.41
°Y -**8.5**7.8**5.11
:. 0.20.40.60.8
* Subtract 9 lbs. (4 kg) from total weight for models without pre-wired subpanel.
** For wire sizing, highest leg draw is shown due to current imbalance in some cases.
7.2/7./64.5/4.1/212.8/2.2/819.01/9.2/42
/245.91/341.42/351.42/35
91
1.41/135.41/239.51/539.51/53
7.61 ---
3
6
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