VT Series. Service Kit Manual CAUTION

Transcription

1 VT Series Electric Humidifier Service Kit Manual 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_115 Read all warnings and instructions WARNING 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 to download a replacement. Hot surfaces and hot water mc_071608_0910 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. Shut down the energy source mc_071608_0911 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. mc_050808_1551 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. Shut off all electrical power to the humidifier using the field-installed fused disconnect, and lock all power disconnect switches in the OFF position. 2. Verify that the field-installed manual water supply valve is closed. mc_052808_0900 Damage from hot discharge water CAUTION 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. Parts in this service kit are for the VT0 humidifier (October 200 to present). Parts are listed on page 2. mc_111308_135

2 VT Series service kit parts VT-2 / VT- (1PH) Service Kit No No. Part Description Part No. Qty. 1 Probe tool (see Probe Tool inset) Cover gasket Probe assembly Probe gasket Silicone, clear (not shown) VT- (3PH) / VT-6 / VT-8 Service Kit No No. Part Description Part No. Qty. 1 Probe tool (see Probe Tool inset) Cover gasket Probe assembly Probe gasket Silicone, clear (not shown) VT-10 / VT-16 Service Kit No No. Part Description Part No. Qty. 1 Probe tool (see Probe Tool inset) Cover gasket Probe assembly Probe gasket Silicone, clear (not shown) Apply clear silicone (5) to both sides of gasket. 2 Display panel Probe Tool OM-00X 3/8" drive 1 Note: For clarity, this drawing does not show all internal parts. OM-7395X Torque probe assembly to 10 ft-lbs (13.6 N-m). mc_051508_1320 Page 2 DRI-STEEM VT Series Electric Humidifier Service Kit Manual

3 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. Cool down humidifier mc_052808_100 If the tank is hot, cool it down by moving the valve lever located on the drain valve to the manual open position. The fill valve eventually opens, allowing cool water to run into the tank until it is cool enough to handle. Shut down humidifier Follow the procedure below before performing service or maintenance procedures (after the tank has cooled down and drained): 1. Shut off all electrical power to the humidifier using the field-installed fused disconnect, and lock all power disconnect switches in the OFF position. 2. Verify that the field-installed manual water supply valve is closed. The best way to determine how often your particular system needs maintenance is to remove the tank and inspect it after the first year of duty. Potable water carries a variety of minerals and other materials in a mix that varies from location to location. This variation in water quality, combined with the hours of operation and duty cycle, determines your own unique maintenance schedule. To inspect and service humidifier: 1. Access and prepare the tank for removal: CAUTION If the drain light is blinking on the display panel, there is water in the tank that was unable to drain. When full of water, the tank can weigh up to 60 lbs (27 kg). Take necessary precautions to support the additional weight when removing the tank fasteners. a. Loosen the fasteners on the top of the shroud. b. Remove the fasteners on the bottom of the shroud. c. Remove the shroud. WARNING! Do not remove the power/heater terminal cover until electrical power is disconnected. Contact with energized circuits could cause property damage, severe personal injury or death as a result of electrical shock. If the tank is hot, cool it down by moving the valve lever located on the drain valve to the manual open position. The fill valve eventually opens, allowing cool water to run into the tank until it is cool enough to handle. Important: After the drain valve is manually opened, verify that tank water is running from the drain piping to the plumbing system. If tank water is not draining, unplug the probe plug from the probe assembly (located on the tank cover) to allow the fill valve to energize and overfill the tank. When the tank is cool enough to handle, plug the probe plug back into the probe assembly. Take necessary precautions to support the additional water weight when removing the tank fasteners. DRI-STEEM VT Series Electric Humidifier Service Kit Manual Page 3

4 Figure -1: Tank with closed fastener Drain valve Terminal cover Figure -2: Probe rod assembly Figure -3: Tank with open fastener Terminal cover Drain valve 2 3 Tank cover 2 3 Tank cover 9 5 Probe housing OM-019 Probe plug Probe assembly OM-052 OM-020 WARNING! Do not touch the tank or drain piping until the unit has had sufficient time to cool, or serious injury could occur. Opening the drain valve when the tank is hot can discharge water with a temperature up to 212 F (100 C) into the plumbing system. This could cause damage to the plumbing system. d. Shut off the water supply. e. Shut off the electrical supply. f. Allow the tank to completely drain. g. Disconnect the drain hose or the field installed union from the drain valve connection on the back left corner of the cabinet. Disconnect the drain valve electrical plug. 2. Remove the tank (see Figure -1 for drawing callout numbers): a. Hold up on the bottom of the tank (Callout 6 in drawing) and remove the top mounting nuts (Callouts 2 and 3). b. Hold up on the bottom of the tank while removing the bottom mounting nut (Callout ). When the bottom mounting nut is removed, the handle (Callout 5) falls away from the tank. Use both hands to support the tank and lower it straight down to clear heaters. Use care not to damage gasket. 3. Clean the tank interior using a putty knife or similar flat instrument. Clean the strainer inside the tank located over the tank drain opening. Use a wire brush and verify that all the strainer holes are open.. Open the drain valve with the manual lever on the side of the actuator and run water through the drain valve to remove any collected sediment. 5. Unscrew the probe assembly and clean the plastic probe housing, ensuring that all passageways are clear (see Figure -2). Clean the probe rods using steel wool or a similar mild abrasive material. Inspect the composite plastic probe assembly for any signs of cracking, roughness, or deterioration. If found, replace. 6. Install the probe assembly, probe plug, probe housing and the gasket into the cover (see Figure -2). 7. Re-install the tank (see Figure -3 for drawing callout numbers): a. Using both hands, lift the tank (Callout 6 in drawing) up around the heaters until the threaded fasteners penetrate the cover flange. b. Hold the tank in place with one hand and pull the handle (Callout 5) toward you and up onto the threaded fastener on the front bottom of the tank. Make sure gasket is centered on tank flange. Page DRI-STEEM VT Series Electric Humidifier Service Kit Manual

5 c. Push the handle up against the backing nut (Callout 9) and run nut (Callout ) up the threaded fastener so it holds the handle in place. d. Tighten nut (Callouts 2 and 3) down on the threaded fasteners extending through the cover flange. e. Tighten nuts (Callouts 2, 3, and ) to complete the process of returning the tank to its position prior to removal. f. Reconnect the drain hose to the drain valve connection in the back left corner. g. Reconnect the drain valve electrical plug. 8. Verify electrical connections: a. Verify that all DIN rail-mounted components are securely fastened to the DIN rail. b. Verify that all power terminal screws and lugs are tight from power block to heaters. See Table 5-1 for torque specifications. c. Verify that all electrical plugs located under the shroud are completely plugged in (transformer, contactor, drain valve, and fill valve). 9. Move the drain valve lever back to the auto position. Table 5-1: Torque specifications Screw or lug location Torque inch-lbs Nm Power block Contactor Heater nut Heater wire lug 8-32 nut (8.5 mm) nut (9.5 mm) 6 gauge wire (10 mm 2 ) 8 gauge wire (6 mm 2 ) 10-1 gauge wire (<6 mm 2 ) Turn on the water supply. 11. Turn on the electrical power. 12. Allow the tank to fill with water and initiate a humidity demand signal (see Figure 5-1 for drawing callout numbers). Important: Verify that the gasket seal is not leaking prior to leaving the humidifier unattended. If a leak is observed in the left front or side of the gasket, loosen backing nut (Callout 7 in drawing) one turn and tighten fastener nut (Callout 2) down onto the cover flange. Continue this one turn at a time until the leak stops. If a leak is observed in the right front or side of the gasket, loosen backing nut (Callout 8) one turn and tighten fastener nut (Callout 3) down onto the cover flange. Continue this one turn at a time until the leak stops. If a leak is observed in the rear of the tank, loosen backing nut (Callout 9) two turns and tighten up fastener nut (Callout ) onto the handle. Continue this two turns at a time until the leak stops. Replace gasket if necessary. 13. If this maintenance occurred at the end of a humidification season, turn the demand for humidity down to the minimum setting and the humidifier will go into an end-of-season drain after 72 hours. 1. If this maintenance occurred during the humidification season, turn the demand for humidity to the desired set point. Figure 5-1: Tank with closed fastener Drain valve Terminal cover Tank cover 9 8 OM-019 DRI-STEEM VT Series Electric Humidifier Service Kit Manual Page 5

6 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; and there is no off-gassing, flammability, or added heat risks associated with other cleaning solutions. 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. DRI-STEEM Corporation An ISO 9001: 2000 certified corporation U.S. Headquarters: 199 Technology Drive Eden Prairie, MN or (fax) European office: Marc Briers Grote Hellekensstraat 5 b B-3520 Zonhoven Belgium (voice) (fax) marc.briers@dristeem.com mc_021908_110-elec Continuous product improvement is a policy of DRI-STEEM Corporation; therefore, product features and specifications are subject to change without notice. DRI-STEEM is a registered trademark of DRI-STEEM Corporation and is filed for trademark registration in Canada and the European community. Drane-kooler is a trademark of DRI-STEEM Corporation. Off-season shut down procedure Perform tank cleaning and humidifier maintenance at the end of the humidification season. If softened water is used, the tank may not need cleaning until after multiple humidification seasons. Important: The tank should be removed after the first season of use to observe the amount of collected minerals in the tank. If there is more than ½" (13 mm) of minerals in the tank after one season of use, clean the tank annually. If it is determined that cleaning is necessary every two or three seasons, then the only off-season shut-down procedure required is to turn the demand for humidity down to the minimum setting. The tank will go into an end-of-season drain after 72 hours without a demand for humidity. When humidification is desired, turn the demand up to the desired set point and the system will start up. Start-up 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_ DRI-STEEM Corporation 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 Form No. VT-SKM-0808 that was shipped with the humidifier for warranty information. Page Part 6 No DRI-STEEM VT Series Electric Humidifier Service Kit Manual mc_081308_105