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NHSC / NHDI
Resistive Element
Steam Humidifiers
Installation, Operation,
Maintenance, and
Troubleshooting Guide
NHDI
NHSC
IMPORTANT: Read and save these instructions. This
guide to be left with equipment owner.
Form #04-197-1 1505921
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Table Of Contents INSTALLATION 1 RECEIVING & UNPACKING EQUIPMENT ................................1 PRE-INSTALLATION CHECKPOINT ...................................1 BASIC HUMIDIFIER CONFIGURATION..................................1 LOCATION & MOUNTING.........................................2 HUMIDIFIERS·············································2 BLOWER PACKS ···········································3 STEAM DISTRIBUTORS AND SHORT ABSORPTION MANIFOLD ·················3 PLUMBING................
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RESETTING FAULT INDICATION “ERROR”.............................21 HEATING ELEMENT REPLACEMENT INSTALLATION INSTRUCTIONS................21 TROUBLESHOOTING ··········································23 CONTROL CIRCUIT TERMINAL BLOCK.................................25 PRE-START-UP CHECKLIST ......................................26 START-UP CHECKLIST .........................................27 MAINTENANCE CHECKLIST.......................................28 EXPLODED VIEWS...............................
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as indicated on the spec label. Refer to local INSTALLATION codes. RECEIVING & UNPACKING EQUIPMENT 3. Report any discrepancy immediately. 1. Check packing slip to ensure ALL material has BASIC HUMIDIFIER CONFIGURATION been delivered. NORTEC NHSC / NHDI humidifiers share a 2. All material shortages are to be reported to modular sheet metal cabinet. Each unit has a right NORTEC within 48 hours from receipt of side electrical compartment. Each electrical goods. NORTEC assumes no responsibility comp
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Figure #3 1. Location of the humidifier should be below and Clearance Required (Top View) as close as possible to the steam distributor location. If possible, DO NOT locate humidifier Condensate Return any further than absolutely necessary from steam distributor location, as controllability and net output will be reduced as a result of heat loss through the steam hose (see Steam Distribution Engineering Manual). 2. Where possible, mount humidifier at a height Right Side convenient for servicing.
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and visible from within the plumbing section of Figure #7 the unit, and that the unit’s flanges are Remote Mounted Blower Packs (RMBP) properly contained within the wall bracket. 23.0" 14.2" (58.4 cm) (36.2 cm) 5. Install tank bracket. See Figure #5. (NHSC 2.9" Version only). Mounting the scale tank. (NHSC (7.3 cm) 11.0" Version only). (28.0 cm) Wall Mounting Figure #6 Bracket Remote Mounted Blower Pack Power Steam Condensate Dimensions Shown Remote Mounted Are Steam Line Connections Blower Pack
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2. All NHSC / NHDI Series blower packs consist 6. For installation details, please refer to the of a steel cabinet containing: blower/motor installation manual located in the Steam powered by voltage directly from the Distributor box, Form #XX-231. humidifier, fuse, relay, speed select switch, stainless steel steam distributor, supply air 7. For calculating absorption distances, refer to H.E.L.P. Software or the Steam Distribution grille with adjustable louvers, and a built-in manual reset safet
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Figure #9 Typical AHU / Duct Application using a SAM-e NHSC uses Nortec steam hose 1.75” O.D. Or Med. L Copper Insulated Steam Inlet NHDI uses Nortec steam hose 1.75” O.D. or stainles steel pipe. Do not exceed 10 ft when using steam hose. SAM-e Min Humidistat 24” Steam Line Trap depth Connection 2” greater than duct static pressure LCD Keypad Condensate return Display with to floor drain, sump LED Status Scale pump or back to the Collector humidifier Tank Low Voltage NHSC Controls Wiring 24 Vac
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#11). A field-supplied funnel (see Figure #12) PLUMBING is recommended. It will prevent backup in the drain pan and in the cylinder due to partially All water supply and drain line connections blocked or badly installed drain lines. This should be installed in accordance with local prevents rusting of the drain pan. plumbing codes and should be copper or other material suitable for potable water at 140ºF (60ºC). 2. The NHSC scale collector tank is also equipped with its own drain. It is WATER SU
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Figure #11 STEAM LINE AND CONDENSATE RETURN LINE Drain Line Connection 1. Refer to the installation manual of the steam distribution system used in your application. Steam Distributor Form #XX-231, SAM-e Form #XX-249, and Blower Pack Form Supply Water Power #XX-277. Inlet Connection NHSC 3/8“ Controls Scale Inlet Collector ELECTRICAL Tank Drain Optional Water Cooler Cooling Kit Connection 3/8” PRIMARY VOLTAGE SUPPLY WIRING TO for SSR A (consult HUMIDIFIER factory) 7.95 Drain (20.2) Connection B
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Figure #14 Primary Voltage Supply Wiring VOLTAGE PRIMARY (LINE) VOLTAGE WIRING TO UNIT (BYOTHERS) (ACTUAL) Ground Wire Ground Leg Ground L1 Dedicated 2Pole Circuit Terminal Breaker L2 Or Block Disconnect - Single Phase Unit. - Single Phase Supply. E I - Required Voltage Between L1 And L2. X N - Load Balanced. T T Ground Wire Ground Leg Ground L1 Dedicated 2Pole Circuit Terminal Breaker L2 Block Or Disconnect L3 - Single Phase Unit. - 3 Phase Supply. E I Neutral - Required Voltage Between L1 And
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4, All blower packs require field wiring between A - Wall or Duct Mounted Control On/Off two pole primary voltage terminal blocks and Humidistat: Wired to make on drop in humidity, break two low voltage control (class 1 circuit wiring on rise to set-point. Set to desired % RH. Can be a required) terminal strips; one of each located make/break set of contacts from a Building Automation in the humidifier and the remote blower pack System. cabinet. To properly access the primary block on the humidi
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temperature are uniform and representative of one of several control wiring diagrams. In all spaces being humidified. cases, modulating signal interfaces through control terminal strip to main pc board inside 3. Mount duct high limit humidistat humidifier. downstream of steam distributors far enough that, under normal humidity and air flow 4. For set-point control at the humidifier an conditions, steam will have been fully integrated controller can accept a direct absorbed (typically at least 10
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OPTIONAL MODULATION (CONTINUOUS control board. The humidifier’s operating status is CONTROL) PACKAGES BY NORTEC reported to the user by the green, red and yellow indicator lights on the front of the unit. 1. Modulation (continuous control) “packages” are offered as accessories by NORTEC. The prerequisites for getting power and water into the steam cylinder are as follows: Power supply comes from inside NHSC / NHDI humidifiers. - On/off switch must be switched on. 2. NORTEC provides the humidity
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Ensure the valve on the NHSC mineral tank is STEAM GENERATION REGULATION closed. The steam is produced in the steam tank by Switch on the steam humidifier main switch. resistive heating element technology. An external or the internal regulator for connection as required control The steam humidifier carries out a system test. the steam production fully variably from 3 to 100%. The display below appears and the three LEDs light for approx. 3 seconds. FLUSHING - NHSC ONLY test The evaporation p
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Green LED lit: Unit producing steam Yellow LED flashing: Major or minor servicing due. The relevant notice is shown in the display. Red LED flashing: There is a problem. The unit is trying to solve the problem. The relevant warning message appears in the display. Red LED lit: Insoluble problem. The relevant error message appears in the display. Optional Remote operating and fault indication If the steam humidifier is equipped with the optional remote operating and fault indication (optio
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Internal Controller INTERROGATION OF THE OPERATING STATUS Controller funct off The NHSC / NHDI operating and display unit has Internal controller activated (”on”)/deactivated a “display menu” from which various operating (”off”) parameters can be viewed. Working Hours Note: It is not possible to change the values on the elapsed time display level. 623 Operation Total of working hours elapsed since initial commissioning of the steam humidifier. Call up the display level with <>or<>. Time Remain
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Note: The stated times are based on 100% steam Note: Water quality conditions resulting in capacity. If the operation is at a lesser capacity, the component failures are not covered under Nortec’s time should be extended accordingly. The servicing standard warranty. intervals are set using the rotary switch “S2” on the control board. The factory settings are based on the following water conditions when the unit leaves the factory. Drain Cycle drain cycle Water NHSC NHDI 4: 120 Parameters The fol
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power limit screen. To change the power limit, simply Soft Start press the down aroow key to desired capacity and Soft Start press enter to save that new value. Press menu key Off to exit parameter screen. Soft Start activated (on), consult factory. Inlet Valve Correction Deactivated (off) factory set. inlet valve cor. Demineral Mode 130 Demineral Mode Set inlet valve correction (cycle ratio) in % of Off standard setting value to balance out water pressure variations. Demineral mode activated (o
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Unit Type NOTES ON MAINTENANCE machine type Figure #21 xxlb/xxxV Major Maintenance - NHSC / NHDI Warning: In order to eliminate faults, the steam humidifier must be switched off and secured against NHSC Maintenance unintentional re-connection. Take care that the Complete cleaning (between 600 - 6000 electricity supply to the main contactor is disconnected hours of operation) (check with voltage meter). - Unit indicates cleaning is required. Only allow trained and qualified personnel to - This cl
