CRUV® Ele ctric H umidifie r Ins tal l ati o n, Op eration , and Mai ntenance Man u al
War nings and cautions Wa r n i n g s a n d c a u t i o n s WARNING Indicates a hazardous situation that could result in death or serious injury if instructions are not followed. CAUTION Indicates a hazardous situation that could result in damage to or destruction of property if instructions are not followed. mc_051508_1145 WARNING Attention installer Read this manual before installing, and leave this manual with product owner.
Wa r n i n g s a n d c a u t i o n s WARNING Disconnect electrical power Disconnect electrical power before installing supply wiring or performing service or maintenance procedures on any part of the humidification system. Failure to disconnect electrical power could result in fire, electrical shock, and other hazardous conditions. These hazardous conditions could cause property damage, personal injury, or death.
Ta b l e o f c o n t e n t s ATTENTION INSTALLER Warnings and cautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii Read this manual before installing. Leave manual with product owner. Overview Product overview Tap/softened water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DI/RO water option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Water type conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ta b l e o f c o n t e n t s Operation Start-up procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Start-up checklist LW series controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tap/softened water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DI/RO water option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Vapor-logic4 controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview Product overview Figure 2-1: CRUV humidifier Tap/softened water model DI/RO water option Float switch Probe Heater terminal cover Steam outlet Heater terminal cover Steam outlet Strainer Cover Cover Water supply Fill valve Cover bolts Cover bolts Overflow Over flow Heater element Heater element Electric drain Tank temperature sensor ½" SST ball valve Tank temperature sensor OM-770-1 Notes: See Pages 8 and 9 for detailed installation drawings.
Overview Product overview Dispersion options Dispersion options shown on this page are available for CRUV humidifiers. See the installation instructions beginning on Page 6. Figure 3-4: Water level control for tap/softened water humidifier Figure 3-1: Ultra-sorb dispersion Fill valve closes when water level rises to this probe. Fill valve opens when water level is below this probe. Low-water cutoff. Power to heaters is cut if water level drops below this probe.
Overview Specifications, capacities, and weights Table 4-1: CRUV capacities, electrical specifications, and weights Current draw (amps) Maximum steam capacity** CRUV model Single-phase Three-phase Shipping weight*** Operating weight*** kW lbs/hr kg/h 120V 208V 240V 277V 480V 600V 208V 240V 277V 480V 600V lbs kg lbs kg 2 6 2.7 16.7 9.6 8.3 7.2 4.2 3.3 — — — — — 25 11 45 20 4 12 5.4 33.3 19.2 16.7 14.4 8.3 6.7 16.7* 14.4* 12.5 7.2* 5.
Overview Dimensions Figure 5-1: CRUV dimensions Tap/softened water CRUV shown Top view B Electrical conduit knockouts Electrical conduit knockouts: • CRUV Models 2 and 4 have combination knockout for ½" and ¾" conduit connectors; knockout diameters are 22.3 mm and 28.6 mm. • CRUV Models 6 through 34 have combination knockout for ¾" and 1" conduit connectors; knockout diameters 28.6 mm and 34.9 mm.
Installation Selecting a location Figure 6-1: Installation in an air conditioning unit Locate the CRUV humidifier near an electric power source, a water supply, and a drain. Verify that sufficient room is provided for a water seal in the drain piping. See Figures 8-1 and 9-1). Place the control cabinet or electrical subpanel in a grounded protective metal enclosure, and mount in a dry and accessible location.
Installation Selecting a location Humidifier When selecting a location for the humidifier, consider the following: Figure 7-1: Rapid-sorb dispersion • Proximity to the duct Duct Install the humidifier near the air duct system where the dispersion assembly will be located. The maximum recommended length for steam hose connecting a single humidifier to a dispersion assembly is 10' (3 m).
Installation Piping: Ta p / s o f t e n e d w a t e r Figure 8-1: CRUV (tap/softened water) field piping overview Water inlet strainer Steam vapor hose Water supply inlet Tank surfaces will reach 212 °F (100 °C) when operating. Provide outer protection from direct contact, but allow for natural ventilation. If water piping to humidifier is nonmetallic, we recommend a 2” (50 mm) metallic water seal or loop in the supply line to isolate steam during maintenance.
Installation Piping: DI/RO water option Figure 9-1: CRUV (DI/RO water option) field piping overview If water piping to humidifier is nonmetallic, we recommend a 2" (50 mm) stainless steel water seal or loop in the supply line to isolate steam during maintenance Steam vapor hose Tank surfaces will reach 212 °F (100 °C) when operating. Provide outer protection from direct contact, but allow for natural ventilation.
Installation Piping: Supply water and drain piping CAUTION Hot discharge water Discharge water can be as hot as 212 °F (100 °C) and can damage the drain plumbing. To prevent such damage from humidifiers without water tempering, allow the tank to cool before draining. Humidifiers equipped with a water tempering device such as a DRI-STEEM Drane-kooler need fresh make-up water in order to function properly. Make sure the water supply to the water tempering device remains open during draining.
Installation Piping: Drane-kooler Figure 11-1: Drane-kooler field piping connections Notes: t %BTIFE MJOFT JOEJDBUF QSPWJEFE CZ JOTUBMMFS t 5PUBM MFOHUI PG QJQF CFUXFFO IVNJEJGFS BOE %SBOF LPPMFS OPU UP FYDFFE N Tank drain Field piping Frame drain )PU ESBJO XBUFS JOMFU w %/ 7BDVVN CSFBLFS 6OJPO 6OJPO 4VQQMZ XBUFS TIVU Pò WBMWF 6OJPO 4VQQMZ XBUFS JOMFU w %/ UP QTJ UP L1B .
Installation Wiring Humidifier field wiring WARNING Electric shock hazard Only qualified electrical personnel should perform field wiring installation procedures. Improper wiring or contact with energized circuits can cause property damage, severe personal injury, or death as a result of electric shock and/or fire. Do not remove the humidifier electrical panel cover or the heater terminal cover until electrical power is disconnected.
Installation Humidistat and transmitter placement Humidistat and sensor locations are critical Other factors affecting humidity control Humidistat and sensor location have a significant impact on humidifier performance. In most cases, do not interchanging duct and room humidity devices. Room humidity devices are calibrated with zero or little airflow; whereas duct humidity devices require air passing across them. Recommended sensor locations (see figure below): A Ideal.
Installation Dispersion: Selecting the dispersion assembly location Figure 14-1: Ultra-sorb with the High-efficiency Tube option DRI-STEEM humidifiers operate with several types of dispersion assemblies for open spaces and for ducts and air handling units. Dispersion assemblies in ducts and air handling units must be positioned where the water vapor being discharged is carried off with the airstream and is absorbed before it can cause condensation or dripping.
Installation Dispersion: Drip tee installation Install a drip tee as shown below when the humidifier is mounted higher than the dispersion assembly, when interconnecting hose or piping needs to go over an obstruction, or when interconnecting piping runs are long. WARNING Hot surface and steam hazard Dispersion tube, vapor hose, tubing, or hard pipe can contain steam, and surfaces can be hot. Discharged steam is not visible.
Dispersion: Interconnecting piping requirements Important: The steam outlet on the humidifier is sized to the output of the humidifier. DO NOT use vapor hose or interconnecting tubing/piping with an inside diameter smaller than the humidifier steam outlet. See note at left. Failure to follow the recommendations in this section can result in excessive back pressure on the humidifier.
Dispersion: Interconnecting piping requirements Connecting to humidifier with tubing or pipe • See Figures 18-1 and 19-1 for interconnecting tubing and pipe pitch requirements for single tube applications. See Table 21-1 for interconnecting tubing and pipe pitch requirements for Rapid-sorb applications. WARNING Excessive moisture hazard DRI-STEEM strongly recommends installing a duct airflow proving switch and a duct high limit humidistat.
Installation Dispersion: Single tube Figure 18-1: Single tube without condensate drain Duct Single dispersion tube without condensate drain Vapor hose, tubing or pipe. Insulate tubing and hard pipe to reduce steam loss. Do not insulate vapor hose. See Table 16-1 for maximum piping lengths.
Installation Dispersion: Single tube Figure 19-1: Single tube with condensate drain Duct Steam hose, tubing or pipe. Insulate tubing and hard pipe to reduce steam loss. Do not insulate steam hose. See Table 16-1 for maximum piping lengths.
Installation Dispersion: Rapid-sorb WARNING Hot surface and steam hazard Dispersion tube, vapor hose, tubing, or hard pipe can contain steam, and surfaces can be hot. Discharged steam is not visible. Contact with hot surfaces or air into which steam has been discharged can cause severe personal injury. Read all dispersion instructions in this manual, and follow the installation instructions below: • Unpack shipment and verify receipt of all Rapid-sorb components with packing list.
Installation Dispersion: Rapid-sorb Pitch requirements • For Rapid-sorb with the header outside a horizontal-airflow duct, consider the following: – 1½" (DN40) dispersion tubes: Use a fastener of sufficient length to accommodate the 1/8"/ft (1%) pitch requirements toward the ¾" pipe thread (DN20) header drain fitting. – 2" (DN50) dispersion tubes: The bracket can be mounted flush to the ductwork.
Installation Dispersion: Rapid-sorb Figure 22-1: Rapid-sorb in a horizontal airflow with header outside the duct Position L-bracket so that flange is upstream of dispersion tubes. Drawing shows L-bracket positioned for airflow back to front. L-bracket flow Air Dispersion tube Duct Point tubelets perpendicular to airflow 90° long sweep or two 45° elbows Secure and seal escutcheon plates Support bracket that has 0.
Installation Dispersion: Rapid-sorb 4. Position the flange of the L-bracket so it is upstream of the tubes when the assembly is raised and fastened into position. Fasten the L-bracket to the end of the dispersion tubes with the provided bolt, lock washer, and flat washer. Note: See Page 26 for steam supply and condensate drain line connection instructions. 5. Before tightening the L-bracket bolts to the dispersion tubes: • For 1½" (DN40) dispersion tubes: – Dispersion tube will rotate in slip coupling.
Installation Dispersion: Rapid-sorb Figure 24-1: Rapid-sorb in a horizontal airflow with header inside the duct Position L-bracket so that flange is upstream of dispersion tubes. This drawing shows the L-bracket positioned for airflow back to front Dispersion tube flow Air Point tubelets (steam orifices) perpendicular to airflow Duct Slip coupling or hose cuff 90° long sweep or two 45° elbows Support bracket Pitch* Vapor hose, tubing or pipe. Insulate tubing and hard pipe to reduce steam loss.
Installation Dispersion: Rapid-sorb 4. Mount the dispersion tubes on the header with the slip couplings or hose cuffs: • When installing slip couplings for 1½" (DN40) dispersion tubes, take care not to shear O-rings. • Set slip coupling on header stub or dispersion tube so O-ring is resting on face of tubing. • Rotate slip coupling while pushing it onto the tubing. • O-rings are lubricated at factory. If additional lubrication is necessary, DO NOT use petroleum-based lubricant.
Installation Dispersion: Rapid-sorb CAUTION Steam supply connections to Rapid-sorb header Operate Rapid-sorb within rated steam capacity Connect the steam supply interconnecting piping from the humidifier to the Rapid-sorb. The steam supply piping requires a minimum of 1/8"/ft (1%) pitch toward the header. Excessive steam flow to the Rapid-sorb steam dispersion assembly can cause condensate to exit the tubelets, which can cause water damage and standing water in the duct or air handler.
Operation Start-up procedure The CRUV humidifier is available with either the LW series controller or the optional Vapor-logic4 control system. If your system is equipped with the Vapor-logic4 system, refer also to the Vapor-logic4 Installation and Operation Manual as noted in the instructions below. After the system is installed and connected properly: 1.
Operation Start-up checklist LW s e r i e s c o n t r o l l e r Tap/softened water ☐ Adjust humidistat setting to create a call for humidity. ☐ Open shut-off valve on water supply line, and confirm that drain valve is closed. Tank should begin filling with water through fill valve. ☐ Shortly before fill valve shuts off, rising water level causes water to come in contact with the bottom probe, and heating element contactor(s) will be actuated. ☐ Check heater cut-off circuit as follows: 1.
Operation Start-up checklist Va p o r- l o g i c 4 c o n t r o l l e r If an item in the Start-up checklist below does not apply to your system, skip to the next item and continue the process. ☐ Read this manual and all other information that was provided with your humidifier. ☐ Verify that all field wiring is done according to the instructions in this manual and in the humidifier wiring diagram. ☐ Confirm that the input signal is consistent with the Vapor-logic4 controller's expected input signal.
Operation Start-up and operation: LW s e r i e s c o n t r o l l e r The LW series controller is a custom microprocessor-based water level controller for DRI-STEEM humidifiers. The features of this controller are: • • • • • Important: Timer logic input wire (see Figure 32-1) must be connected per wiring diagram for proper automatic drain/flush and end-of-season drain operation. Power light blinks off twice at one-second intervals when these functions are disabled.
Operation Start-up and operation: LW s e r i e s c o n t r o l l e r Automatic drain and flush (tap/softened water) End-of-season drain The LW series controller employs an electronic timer that tracks the humidifying time of the unit.
Operation Start-up and operation: LW s e r i e s c o n t r o l l e r Variable skim times (tap/softened water) Onboard diagnostics (tap/softened water) The skim time feature removes surface solids and foam from the water. This keeps the fill valve open for a certain amount of time after the water reaches the top probe (see Figure 3-1). The skim time is factory set for 32 seconds but can be changed in the field for locations with water that requires more skimming. See “Skim duration” on Page 33.
Maintenance Ta p / s o f t e n e d w a t e r The best way to determine how often your humidifier needs maintenance is to remove the tank cover and inspect it for mineral deposits after three months of duty. Hours of operation and duty cycle will determine your maintenance schedule, as will water quality.
Maintenance Ta p / s o f t e n e d w a t e r Shut down humidifier Follow the procedure below before performing service or maintenance procedures (after the tank has cooled down and drained): • If the humidifier is equipped with a Vaporlogic4 controller, use the keypad to change the control mode to Standby. • Shut off all electrical power to the humidifier using the field-installed fused disconnect, and lock all power disconnect switches in the OFF position.
Maintenance Ta p / s o f t e n e d w a t e r Inspection and maintenance 1. Annually (also recommended when maintenance is performed) • Inspect tank and gaskets for leaks. • 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.
Maintenance Ta p / s o f t e n e d w a t e r Table 36-1: CRUV torque specifications Torque Screw or lug location in-lbs N-m Power block 16 1.8 Contactor 16 1.8 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.
Maintenance Ta p / s o f t e n e d w a t e r Off-season shut-down procedure 1. Switch off electrical power. WARNING 2. Remove the enclosure. Electric shock hazard 3. Shut off the water supply to the makeup valve. Do not remove humidifier electrical panel cover, heater terminal cover, or subpanel access panels until electrical power is disconnected. Improper wiring or contact with energized circuits can cause property damage, severe personal injury, or death as a result of electric shock and/or fire.
Maintenance DI/RO water option DI/RO humidifiers use DI/RO water. Because these water types are mineral free, cleaning the evaporating chamber should not be necessary. However, there are some maintenance steps that should be followed to ensure all parts of the unit are in working order. I m p o r t a n t : Verify regularly that water processing equipment is operating correctly.
Maintenance DI/RO water option 7. Secure the chamber cover making sure the cover gasket is seated and the chamber is sealed. 8. Reinstall the evaporating chamber. • Reconnect the fill line. • Reconnect electrical plugs (the plugs are color coded). • Reconnect drain union. • Reconnect vapor hose. 9. Verify electrical connections: • Verify that all DIN rail-mounted components are securely fastened to DIN rail. • Verify that all power terminal screws and lugs are tight from power block to heaters.
Maintenance Tr o u b l e s h o o t i n g : LW s e r i e s c o n t r o l l e r Table 40-1: CRUV troubleshooting guide (tap/softened water) Problem Humidifier will not heat Humidifier will not fill Humidifier does not stop filling Module indicating lights Full Ready water Drain Off Off Off On Off Off On Off Off Possible cause Recommended action Control transformer Verify control voltage across secondary leads of transformer. Reset transformer circuit breaker.
Maintenance Tr o u b l e s h o o t i n g : LW s e r i e s c o n t r o l l e r a n d D I / R O w a t e r Table 41-1: CRUV troubleshooting guide (DI/RO water option) Problem Possible cause Recommended action Control transformer Verify control voltage across secondary leads of transformer. Reset transformer circuit breaker. Humidistat is not calling Set humidistat to call. Inspect for faulty humidistat. Safety controls open Check safety control. (Airflow switch, high limit humidistat, etc.
Maintenance Replacement parts: CRUV Humidifier Figure 42-1: CRUV replacement parts 1 6 7 2 3 8 9 4 5 10 27 20 21 11 19 26 18 25 12 24 12 15 15 14 16 16 13 13 1 23 14 17 16 15 DI/RO water CRUV 22 16 Tap/softened water CRUV 15 OM-779-A Page 42 • DRI-STEEM CRUV Electric Humidifier Installation, Operation, and Maintenance Manual
Maintenance Replacement parts: CRUV Humidifier Table 43-1: Replacement parts Item Description Qty Part No. Item Description Qty Part No.
Maintenance Replacement parts: C R U V s u b p a n e l w i t h LW s e r i e s controller Figure 44-1: CRUV subpanel with LW series controller (tap/softened water) OM-7613 Page 44 • DRI-STEEM CRUV Electric Humidifier Installation, Operation, and Maintenance Manual
Maintenance Replacement parts: C R U V s u b p a n e l w i t h LW s e r i e s controller Table 45-1: CRUV subpanel with LW series controller (tap/softened water) Item Description Qty Part No.
Maintenance Replacement parts: CRUV subpanel with time delay and relay Figure 46-1: CRUV subpanel with time delay and relay (DI/RO water option) OM-7612 Page 46 • DRI-STEEM CRUV Electric Humidifier Installation, Operation, and Maintenance Manual
Maintenance Replacement parts: CRUV subpanel with time delay and relay Table 47-1: CRUV subpanel with time delay and relay (DI/RO water option) Item Description Qty Part No.
Maintenance Replacement parts: C R U V s u b p a n e l w i t h Va p o r- l o g i c 4 option Figure 48-1: CRUV subpanel with Vapor-logic4 option OM-7611 Page 48 • DRI-STEEM CRUV Electric Humidifier Installation, Operation, and Maintenance Manual
Maintenance Replacement parts: C R U V s u b p a n e l w i t h Va p o r- l o g i c 4 option Table 49-1: CRUV subpanel with Vapor-logic4 option Item Description Qty Part No.
Maintenance Replacement parts: C R U V s u b p a n e l w i t h Va p o r- l o g i c 4 and SSR options Figure 50-1: CRUV subpanel with Vapor-logic4 and SSR option OM-7610 Page 50 • DRI-STEEM CRUV Electric Humidifier Installation, Operation, and Maintenance Manual
Maintenance Replacement parts: C R U V s u b p a n e l w i t h Va p o r- l o g i c 4 and SSR options Table 51-1: CRUV subpanel with Vapor-logic4 and SSR option Item Description Qty Part No.
Warranty Expect quality from the industry leader Two-year Limited Warranty For more than 45 years, DRI-STEEM has been leading the industry with creative and reliable humidification solutions. Our focus on quality is evident in the construction of the CRUV humidifier, which features cleanable, stainless steel construction. DRI-STEEM also leads the industry with a Two-year Limited Warranty and optional extended warranty.
