Nortec NHDI, NHSC User Manual

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Page 1

NHSC / NHDI Resistive Element Steam Humidifiers

Installation, Operation,

Maintenance, and

Troubleshooting Guide

NHSC

NHDI

IMPORTANT: Read and save these instructions. This guide to be left with equipment owner.

Form #04-197-1 1505921

Page 2

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 .................................................6

WATER SUPPLY LINE ········································6

DRAIN LINE ··············································6

STEAM LINE AND CONDENSATE RETURN LINE ··························7

ELECTRICAL................................................7

PRIMARY VOLTAGE SUPPLY WIRING TO HUMIDIFIER ······················7

PRIMARY VOLTAGE SUPPLY WIRING FROM HUMIDIFIER(S) TO BLOWER PACKS ·······7

LOW VOLTAGE CONTROL WIRING ·································9

CONTROL INSTALLATION ······································9

OPTIONAL MODULATION (CONTINUOUS CONTROLS)······················10

OPTIONAL MODULATION (CONTINUOUS CONTROL) PACKAGES BY NORTEC ········11

OPERATION 11

INTRODUCTION .............................................11

LAYOUT AND FUNCTION ........................................11

LEVEL REGULATION ········································11

STEAM GENERATION REGULATION································12

FLUSHING ··············································12

SCALE COLLECTOR TANK ·····································12

NHSC/ NHDI OPERATION ........................................12

STARTING OPERATION ·······································12

INTERROGATION OF THE OPERATING STATUS ···························14

MAINTENANCE..............................................17

NOTES ON MAINTENANCE .....................................17

DISMANTLING AND REASSEMBLYWORK .............................18

NOTES ON CLEANING........................................18

FAULT ELIMINATION ........................................19

SCALE TANK SERVICING ......................................20

REPLACING UNIT FUSES ......................................21

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RESETTING FAULT INDICATION“ERROR” .............................21

HEATING ELEMENT REPLACEMENTINSTALLATION INSTRUCTIONS ................21

TROUBLESHOOTING ··········································23

CONTROL CIRCUIT TERMINALBLOCK .................................25

PRE-START-UP CHECKLIST ......................................26

START-UP CHECKLIST .........................................27

MAINTENANCE CHECKLIST .......................................28

EXPLODED VIEWS ............................................30

WIRING DIAGRAMS ...........................................34

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INSTALLATION

as indicated on the spec label. Refer to local codes.

RECEIVING & UNPACKING EQUIPMENT

1. Check packing slip to ensure ALL material has been delivered.

2. All material shortages are to be reported to NORTEC within 48 hours from receipt of goods. NORTEC assumes no responsibility for any material shortages beyond this period.

3. Inspect shipping boxes for damage and note on shipping waybill accordingly.

4. After unpacking, inspect equipment for damage and if damage is found, notify the shipper promptly.

5. All NORTEC products are shipped on an F.O.B. factory basis. Any and all damage, breakage or loss claims are to be made directly to the shipping company.

PRE-INSTALLATION CHECKPOINT

1. Ensure that available voltage and phase corresponds with humidifier voltage and phase as indicated on humidifier’s spec label (see Figure #1).

3. Report any discrepancy immediately.

BASIC HUMIDIFIER CONFIGURATION

NORTEC NHSC / NHDI humidifiers share a modular sheet metal cabinet. Each unit has a right side electrical compartment. Each electrical compartment has a hinge-down front door which is removable from any partially or fully opened position. Each electrical compartment has a screw-mounted right side cover which can open for ease of electrical connection. For safety, the door when closed keeps the side cover from being opened.

Single units have a plumbing compartment attached to the left side of the electrical. Double units have a second plumbing compartment. Each plumbing compartment has a hinge-down front door. For safety, the door must be closed in order to engage the safety interlock. To avoid any danger, never operate the humidifier with a door off.

To open the doors, unlock, lift door up slightly and pull top of door forward. Door will hinge 180 degrees and hang straight down. To remove door, swing door parallel to floor. Then lift up slightly and out. To reinstall door, hold parallel to floor and insert hinge pins at bottom.

2. Ensure that the dedicated external disconnect is of sufficient size to handle the rated amps

Figure #1

NHSC / NHDI Series Humidifier

SteamOutlet

1.75" O.D.

Water

Supply

NOTE: NHDI does not have the scale collector tank.

Scale Collector Tank

Spec Label

Drain Valve

Optional SSR Cooling Fans

Keypad Display

Power and Control Wiring

Figure #2

Minimum Steam Line Clearance

Min. 10 Degree Slope

Min. 12"

Trap

* See Section On

Condensate

Return Line

NOTE: Trap must be 3' minimum down from steam distributor If not, condensate must be routed to drain.

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Figure #3

Clearance Required (Top View)

Condensate Return

Steam Outlet

NOTE: Local and national codes may deviate, please consult applicable codes for clearance requirements. Right side min. 36" side clearance. Min. 36" frontal clearance recommended see note. Top 12” Min, Bottom 12” Min, and Left Side 2” Min.

LOCATION & MOUNTING

HUMIDIFIERS

Right Side

Front

1. Location of the humidifier should be below and as close as possible to the steam distributor location. If possible, DO NOT locate humidifier 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 convenient for servicing.

3. Wall mounting bracket provided should be securely attached horizontally and open edge facing upwards, using field-supplied fasteners. For a single unit, use a minimum of 4 - #12 x 3” long wood screws. For a double unit, use a minimum of 6 - #12 x 3” long wood screws. These screws must be fastened securely on a 2 x 4 wood stud or equivalent support. If any spacer material is used between the bracket and the structural material such as drywall, increase fastener length accordingly. In addition, install a minimum of 2 field supplied fasteners in the holes provided in the back of the unit to prevent the unit from being bumped off the wall bracket. See Figure #4.

NHSC / NHDI Series humidifiers are designed to mount on a suitable wall or vertical surface. Do not sit the unit on floor due to clearances required for plumbing, electrical, and control entrances. The clearance dimensions shown in this manual are for reference only and are the minimum required for maintenance of the humidifier. Local and National Codes should be consulted prior to final location and installation of the humidifier. NORTEC will not accept responsibility for installation code violations.

Figure #4

Wall Bracket Mounting

Frontal clearance min. 36" (91 cm) Right side clearance min. 36" (91 cm) Left side clearance min. 2" (5 cm)

Wall

7.7"

(19.6 cm)

4. Mount unit on hanging bracket after ensuring the bracket is properly anchored to the wall. Raise the unit and place it on the hanging bracket ensuring that the flanges in the mounting bracket are properly aligned and centered with the flanges of the unit. Push the unit in towards the wall to properly interlock the two flanges. Note: This will result in the unit shifting slightly down. Ensure that the hanging bracket’s flanges are fully engaged

Figure #5

Installation of the Scale Tank Bracket (NHSC only)

1) Line up holes in bracket with

holes in drain pan. Fasten the bracket to the drain pan using the four Nylon lock nuts provided.

2) Fasten the front of bracket with the two #10-24 self tapping screws provided.

3) The two locking screws for the bracket should already be installed.

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and visible from within the plumbing section of the unit, and that the unit’s flanges are properly contained within the wall bracket.

5. Install tank bracket. See Figure #5. (NHSC Version only). Mounting the scale tank. (NHSC Version only).

Figure #6

Remote Mounted Blower Pack

Figure #7

Remote Mounted Blower Packs (RMBP)

23.0"

(58.4 cm)

11.0"

(28.0 cm)

Condensate

Steam

Power

14.2"

(36.2 cm)

2.9"

(7.3 cm)

Wall

Mounting

Bracket

Remote

Mounted

Blower Pack

Scale Collector Tank

6. Make sure humidifier is level.

7. DO NOT mount humidifier on hot surfaces.

8. If humidifiers are mounted on roof, a thermostatically ventilated weatherproof

Typical Remote Mounted Blower Pack Installation

Figure #8

Dimensions Shown Are Steam Line Connections Allow Minimum 12" (31 cm)

7.7"

(19.5 cm)

7.2"

(18.2 cm)

Clearance On Each Side

cabinet provided by others should be used. Consult factory.

9. DO NOT mount humidifiers on vibrating surfaces or duct work.

BLOWER PACKS

1. Blower packs are an optional accessory used to directly distribute steam to localized areas (such as computer rooms) or in structures that do not have a built-in air distribution system.

Remote Mounted Blower Packs (RMBP) Only

NHSC

uses Nortec steam hose 1.75" O.D.or stainless steel pipe.

uses Nortec steam

Min. Trap Height 3" Required

Humidistat

Scale

Collector

Tank - NHSC

Water

Supply 3/8”

Drain Line

1.75” O.D.

Air

Gap

NHSC / NHDI using a Remote Mounted Blower Pack (RMBP)

NHDI

hose 1.75” O.D. or stainless steel pipe.

Do not exceed 10 ft when using steam hose.

Steam Line Connection

LCD Keypad Display with LED Status

Low Voltage Controls Wiring 24 Vac

Primary Wiring Copper Funnel

Drain (by others)

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2. All NHSC / NHDI Series blower packs consist of a steel cabinet containing: blower/motor powered by voltage directly from the humidifier, fuse, relay, speed select switch, stainless steel steam distributor, supply air grille with adjustable louvers, and a built-in manual reset safety thermostat to turn off the humidifier if the blower pack gets overheated. Control thermostat, mounted on the steam distributor, starts the fan when steam is generated. When supply voltage differs from voltage required to run blower motor, the blower pack will contain the proper transformer. All blower packs provide intake air filters, if required.

3. For installation details about the blower pack, please refer to the blower pack installation manual located in the blower pack box, Form #XX-277.

STEAM DISTRIBUTORS AND SHORT ABSORPTION MANIFOLD

1.1. Steam distributors are an optional accessory used to directly distribute steam to localized areas (such as computer rooms) which are served by ducted air. These distributors are made of stainless steel and are mounted level to the duct.

6. For installation details, please refer to the installation manual located in the Steam Distributor box, Form #XX-231.

7. For calculating absorption distances, refer to H.E.L.P. Software or the Steam Distribution Engineering Manual, Form #XX-232.

2. The SAM-e optional accessory has the same function, to distribute steam inside a duct. The only difference is that this system is designed to reduce the absorption distance of the steam in the duct by optimizing the steam distributors.

3. Each cylinder requires its own steam line

and at least one distributor (do not join two or more cylinders to one larger steam line).

Any cylinder’s steam line may be divided into multiple branches to feed more than one distributor. Steam supply line “tees” are common stainless fittings that are available for this purpose.

4. Steam distributor locations are typically as follows: supply air duct, return air duct, air handling unit. Proper location should consider: air temperature, relative humidity before the distributor, air velocity, dimensions of the location, amount of steam being introduced into the duct, downstream obstructions, and surfaces vulnerable to wetting.

5. The NHSC / NHDI can overcome 6” of W.C. duct static pressure max. Consult the factory if you exceed 6” of W.C.

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SAM-e

static pressure

Trap depth

2” greater

than duct

Min 24”

Condensate return

to floor drain, sump

pump or back to the

humidifier

Supply 3/8”

Steam Inlet

Collector

Drain Line

1.75" O.D.

Water

Figure #9

Typical AHU / Duct Application using a SAM-e

NHSC

uses Nortec steam hose 1.75” O.D. Or Med. L Copper Insulated

NHDI

uses Nortec steam hose 1.75” O.D. or stainles steel pipe.

Do not exceed 10 ft

Gap

Air

when using steam hose.

Steam Line Connection

LCD Keypad Display with LED Status

Low Voltage Controls Wiring 24 Vac

Primary Wiring Copper Funnel

Drain (by others)

Scale

Tank

NHSC

Humidistat

NHSC using a Short Absorption Manifold(SAM-e)in Duct/AHU

Figure #10

Typical Duct Application using Standard Distributor

NHSC

uses Nortec steam hose 1.75” O.D. Or Med. L Copper Insulated

NHDI

uses Nortec steam hose 1.75” O.D. or stainles steel pipe.

Do not exceed 10 ft when using steam hose.

Steam Line Connection

LCD Keypad Display with LED Status

Low Voltage Controls Wiring 24 Vac

Primary Wiring Copper Funnel

Drain (by others)

Condensate trap

must be 2” greater

than duct static

pressure.

Steam Inlet

Min 24”

Scale

Collector

Tank

NHSC

Drain Line

1.75" O.D.

Water

Supply 3/8”

Humidistat

Air

Gap

NOTE: NHDI does not have the scale management system.

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PLUMBING

All water supply and drain line connections should be installed in accordance with local plumbing codes and should be copper or other material suitable for potable water at 140ºF (60ºC).

WATER SUPPLY LINE - NHSC

1. The humidifier is intended to operate on potable water.

2. Standard fill valves are sized for water pressure ranging from 30 to 80 psig. For other pressures, consult factory. This pressure should be measured at the humidifier if the water pressure is suspect.

3. ALWAYS supply and install a shut off valve in the fill water supply line dedicated to the humidifier to facilitate servicing. Use ½" OD copper to within 4 feet of the humidifier. Reduce to 3/8" OD and connect to the factory-supplied 3/8" olive compression fitting under the humidifier.

4. Same installation as #3, but add Drain Water Cooler instead of fill.

#11). A field-supplied funnel (see Figure #12) is recommended. It will prevent backup in the drain pan and in the cylinder due to partially blocked or badly installed drain lines. This prevents rusting of the drain pan.

2. The NHSC scale collector tank is also equipped with its own drain. It is recommended to pipe, with a flex hose, the scale collector tank to allow drainage, if required while maintaining ease of servicing (DO NOT HARDPIPE).

3. The drain line should not end in a sink used frequently by personnel, or where plumbing codes prohibit it. Route to a floor drain or equivalent for safety reasons, since drain water from humidifier can be very hot.

4. Keep drain lines as short as possible. Keep

drain lines sloped down, not level and not up since low spots in drain lines will accumulate sediment and cause backup.

The drain line should be 2.0” O.D. copper pipe or larger. Do not use plastic pipe for drain lines. Consult factory.

DRAIN LINE - NHDI

WATER SUPPLY LINE - NHDI

1. Humidifier is intended to operate on Reverse Osmosis (RO) water or De-ionized (DI) water with a water conductivity of less than 20 Microsiemens.

3. ALWAYS supply and install a shut-off valve in the fill water supply line dedicated to the humidifier to facilitate servicing. Use ½" OD plastic or stainless steel to within 4 feet of the humidifier. Reduce plastic or stainless steel to 3/8" OD and connect to the factory-supplied 3/8" olive compression fitting under the humidifier.

4. Same installation as #3, but add Drain Water Cooler instead of fill.

DRAIN LINE - NHSC

1. Humidifier is equipped with a 1.5”" O.D. unthreaded drain outlet on underside of drain canal on bottom of the humidifier (see Figure

1. Humidifier is equipped with a 1.5” O.D. un-threaded drain outlet on underside of drain canal on bottom of the humidifier (see Figure #6). A field-supplied funnel (see Figure #8) is recommended. It will prevent backup in the drain pan and in the cylinder due to partially blocked or badly installed drain lines. This prevents rusting of the drain pan.

2. The drain line should not end in a sink used frequently by personnel, or where plumbing codes prohibit it. If the Drain Water Cooler is used with potable water then copper may be used. Route to a floor drain or equivalent for safety reasons, since drain water from humidifier can be very hot. Verify with local codes on DI and RO water. Drains should be verified for their suitability for RO or DI water and local codes should be checked.

3. Keep drain lines as short as possible. Keep

drain lines sloped down, not level and not up since low spots in drain lines will accumulate sediment and cause backup.

The drain line should be 2.0” O.D. S.S. pipe or larger. Do not use plastic pipe for drain lines. Consult factory.

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Supply Water

Connection

3/8“

Drain

Water Cooler

Connection 3/8”

Drain

Connection

1.5" O.D.

Figure #11

Drain Line Connection

NHSC Scale

Collector

Tank

7.95

(58.4)

Model 010-090 135-180 Left 135-180 Right

23.0

(20.2)

A (in.)

1.7”

Figure #12

Drain Connection

B (in.)

5.4”

20.3”

Power Inlet

Controls Inlet

Optional Cooling Ki for SSR (consult factory)

STEAM LINE AND CONDENSATE RETURN LINE

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 #XX-277.

ELECTRICAL

PRIMARY VOLTAGE SUPPLY WIRING TO HUMIDIFIER

1. Check and ensure that available voltage and

phase corresponds with operating voltage and phase of humidifier as indicated on the humidifier spec label, see Figure #1.

2. Ensure that an adequate power supply is

available to carry full humidifier amperage drawn as specified by rated amps on the humidifier spec label, reference to local codes.

3. A dedicated external disconnect must be

installed. Do not exceed the maximum circuit protection amps as indicated on the nameplate label.

Gap

Clamp and1.5”ID Hose Factory Supplied

Install aCopper Funnelfor theNHSC mode and aStainless SteelFunnel forthe NHDI model (byothers).

4. Connect ground wire to cabinet ground clamp.

Do not use neutral wire of four wire supply as ground.

5. Single phase humidifiers may be run on three

phase power, but load may unbalance power

NOTE: Steam hose should not reach bottom of the funnel.

Install a2” O.DCopper Pipefor theNHSC model and2”O.D. Stainless SteelPipe for the NHDImodel(by others).

grid.

6. External wiring sizes must be in accordance

with NEC and/or CEC and existing local electrical codes and by-laws.

Figure #13

Drain Pump by others (if necessary)

PRIMARY VOLTAGE SUPPLY WIRING FROM HUMIDIFIER(S) TO BLOWER PACKS

1. All blower packs are wired (by others) to be

powered from the humidifier.

Humidifier

2. As a safety feature, blower packs come

equipped with a manual reset safety thermostat and relay built into the blower pack cabinet. The manual reset thermostat turns

Recommended Model Gould - Model SSH Consult Factory

Floor

Surface

Line

Drain Line

off the humidifier if the blower pack gets overheated. The control thermostat, mounted on the steam distributor, starts the fan when steam is generated.

3. All blower packs have high efficiency blowers

to minimize the frontal and overhead clearance required to absorb the steam.

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(ACTUAL)

Figure #14

Primary Voltage Supply Wiring

PRIMARY (LINE) VOLTAGE WIRING TO UNITVOLTAGE

(BY OTHERS)

- Single Phase Unit.

- Single Phase Supply.

- Required Voltage Between L1 And L2.

- Load Balanced.

Neutral

Ground

- Single Phase Unit.

- 3 Phase Supply.

- Required Voltage Between L1 And L2.

- Load Will Be Unbalanced.

Ground Wire

Dedicated

Disconnect

Ground Wire

Dedicated

Disconnect

Circuit

Breaker

Circuit

Breaker

Ground Leg

2Pole Te rm i na l Block

Ground Leg

2Pole Te rm i na l Block

Ground Wire

Neutral

Ground

Dedicated

Circuit

Breaker

Disconnect

- 3 Phase Unit.

- 3 Phase Supply.

- Required Voltage Between Any Two Legs.

- Load Will Be Balanced.

NOTE: VoltageAt TerminalBlock Must Be InAccordance With Spec. Label. All Wiring ToBe InAccordance With Existing NationalAnd Local Electrical Codes.

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Ground Leg

3Pole Te rm i na l

Block

Page 12

4, All blower packs require field wiring between

two pole primary voltage terminal blocks and two low voltage control (class 1 circuit wiring required) terminal strips; one of each located in the humidifier and the remote blower pack cabinet. To properly access the primary block on the humidifier, it is necessary to open the side pan. To connect the primary and control (class 1 circuit wiring required) wiring, the wiring is fed through the grommet provided in the bottom of the blower pack. The terminal block and strip are accessed by removing the blower pack cover.

5. Field wiring of remote blower packs must conform to national and local electrical codes. Refer to wiring diagram supplied inside the humidifier.

6. Use approved wire for power connection from two pole terminal block of remote blower pack to additional two pole terminal block inside electrical section of humidifier.

7. Use approved wire to connect the ground clamp of remote mounted blower pack to ground clamp provided in the electrical section of humidifier.

LOW VOLTAGE CONTROL WIRING

A - Wall or Duct Mounted Control On/Off

Humidistat: Wired to make on drop in humidity, break

on rise to set-point. Set to desired % RH. Can be a make/break set of contacts from a Building Automation System.

B - Duct Mounted Safety High Limit On/Off

Humidistat (if used): Wired to make on drop in

humidity, break on rise to safety set-point. Set to approximately 85% RH as a safety to help prevent saturation and wetting in the duct.

C - Duct Mounted Safety Air-Proving On/Off

Switch (if used): Wired to make with sensed air flow,

break when no air flow. Used as a safety to prevent saturation when there is no airflow.

1. NORTEC offers various versions of A, B and C to suit each application. In general, A is essential, whereas B and C are highly recommended in ducted applications.

2. Field wiring from humidistat to humidifier and between devices should be 18 AWG or heavier and kept as short as possible.

3. Low voltage control terminal strips are provided in the electrical compartment. Internal sides are factory wired. External sides are to be field wired.

On-Off Controls

Figure #15

External Wiring of On/Off Controls

External

Internal

Controls are available from NORTEC as accessories. If controls were not ordered with humidifier, they must be supplied by others. The following information is relevant to all controls, factory supplied or otherwise.

A, B, C and D (described below) are to be wired in series (only one path for current) across terminals 8 and 10 on the low voltage control terminal strip or replaced with a jumper wire for constant operation. Caution: this is the “hot” wire from the 24V control transformer; it will blow the 3A fuse if any control field wiring touches ground.

4. Each humidifier is supplied with a wiring diagram inside.

D - Blower pack safeties

CONTROL INSTALLATION

1. Mount any wall humidistat (control or high limit) over standard electrical box at height similar to typical thermostat. Any wall humidistat should be in location representative of overall space being humidified and not in path of blower pack or air supply grille. Do not mount on a outside wall where temperature fluctuation can affect control response.

2. Mount duct humidistat in location representative of overall air humidity, usually in the return duct. Do not mount it directly in front of steam distributor or in turbulent or mixing zone. Mount it where humidity and temperature are uniform and representative of spaces being humidified.

3. Mount duct high limit humidistat downstream of steam distributors far enough that, under normal humidity and air flow

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temperature are uniform and representative of

spaces being humidified.

3. Mount duct high limit humidistat downstream of steam distributors far enough that, under normal humidity and air flow conditions, steam will have been fully absorbed (typically at least 10 feet). It must be located to sense high humidity only when uniform and representative air is over-humidified or approaching saturation.

4. Mount duct air-proving switch so that it is able to sense air flow or lack of it. Wire it to make when air flow is sensed and break when air flow fails.

5. Check operation of all on/off controls before starting humidifier.

one of several control wiring diagrams. In all cases, modulating signal interfaces through control terminal strip to main pc board inside humidifier.

4. For set-point control at the humidifier an integrated controller can accept a direct transducer signal. The accuracy of the humidifier to changing conditions will be dependant on the accuracy of the signal.

5. The modulation signal must increase from minimum toward maximum as sensed RH (actual RH) drops below desired RH (%RH set-point). In response, humidifier’s steam output will increase from minimum toward maximum. When humidifier’s steam output (lbs/hr) matches humidification load (lbs/hr), modulation signal will stabilize.

6. Calibration of controls (on/off or modulation) in the field may be necessary due to shipping and handling. Verify humidistat accuracy before commissioning system.

OPTIONAL MODULATION (CONTINUOUS CONTROLS)

1. Read on/off controls section first since it is necessary to all control systems.

2. Virtually any modulation (continuous control) external hardware by others (as long as it has %RH set-point circuitry) may be interfaced with pre-specified factory-configured pc board via the control terminal strip.

3. Modulation (continuous control) by others for use with NHSC / NHDI humidifiers involves

Figure #16

Generalized Modulation Wiring

NHSC / NHDI SERIES

CONTROL CIRCUI T T ERMINAL BLOCK

IMPORTANT: REA D THESE INSTRUCTI ONS CAREF ULLY BEFORE CONNECTING CONT ROL WIRI NG

Other On/Off Devices

High Limit Humidistat

Air Proving Switch

Control Humidistat

NOTE: If no On/Off Control is used, then A field jumper must be connected across 8 and 10 in order for humidifier to operate

NOTE: See Included Diagram(s) For Accessory Wiring Instructions

NHDI: Dry Points, rated 24 Vac/dc 1.0Amp max. resistive load per Indicator

OPTIONAL REMOTE

STATUS PCB

K1 Steam

K2 Error

K3 Ser vice

K4 Unit ON

Optional external remote

indication. Any or all of these

remote indications can be

utilized. Refer to Trouble

Shooting Manual for system

status indication.

Optional

Modulation Control

See Diagram included

with unit for details

32 30 28

6. Field-wiring connections for modulation control are to be made to external side of terminals 28, 30 and 32 on humidifier’s control terminal strip. Always refer to the external control’s wiring diagram factory supplied with each NORTEC modulation control option.

7. Varying dc Voltage Modulation Signal Powered by Others: NHSC / NHDI humidifiers can be factory configured to accept the following vdc signals: 0-10 vdc, 0-20 vdc, 1-5 vdc or 2-10 vdc. Wire according to NORTEC supplied external wiring diagram that comes with each modulation option. To share the signal with more than one humidifier, wire in parallel to each humidifier. If a different signal is desired consult factory.

8. Varying dc milliAmp (mA) Modulation Signal Powered by Others: NHSC / NHDI humidifiers can be factory-configured to accept a standard dc mA signal, if pre-specified. Wire according to NORTEC supplied external wiring diagram that comes with each modulation option. Choose from 0-20 dc mA or 4-20 dc mA. To share the signal with more than one humidifier consult factory.

Varying Resistance (W) Modulation by Others: NHSC / NHDI humidifiers can be

factory configured to power a 3-wire varying resistance modulation humidistat by others, if pre-specified. Wire according to NORTEC supplied external wiring diagram that comes with each modulation option. Choose from

0-500W or up to 0-1000W. To share the signal with more than one humidifier consult factory.

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OPTIONAL MODULATION (CONTINUOUS CONTROL) PACKAGES BY NORTEC

1. Modulation (continuous control) “packages” are offered as accessories by NORTEC. Power supply comes from inside NHSC / NHDI humidifiers.

2. NORTEC provides the humidity set point circuitry and sensor(s) for wall or duct mounting or both as pre-selected when ordering the option. NORTEC offers several packages for NHSC / NHDI Series humidifiers. Wire according to NORTEC supplied external wiring that comes with each optional modulation package.

control board. The humidifier’s operating status is reported to the user by the green, red and yellow indicator lights on the front of the unit.

The prerequisites for getting power and water into

the steam cylinder are as follows:

On/off switch must be switched on.

control circuit 8-10 must be made.

door interlock switch must be made (interlock switch

can be pulled out to operate unit).

Modulating signal must be calling.

Internal safeties must be made over temperature

switch and ground fault.

3. Optional modulation packages without modulating safety high limit can use on-off safety high limit. Refer to on-off controls section.

4. All versions can use on-off safety air proving switch. Refer to on-off controls section.

OPERATION

INTRODUCTION

The NORTEC NHSC Series humidifier is a completely new design based on up-to-date technology. The NHSC is designed to provide clean steam humidification at an economical price.

The NHSC uses a micro-computer control system for greater flexibility. The NHSC has a liquid crystal display (LCD) to indicate system messages and display RH.

LAYOUT AND FUNCTION

LEVEL REGULATION

The water level in the steam tank is continuously

monitored with the level unit.

The unit pulse fills based on steam production. The pulse filling in the unit varies depending on the water level detected by the float chamber.

One magnetic float monitors five different water levels in the float chamber. The second float ensures the water level is always above the heating elements.

The pressure equalizing pipe between the steam connection and the level unit ensures that the water levels are the same in the steam tank.

The NHSC humidifiers consist of a plumbing and an electric compartment. In every case there is at least one steam distributor (SD) for installation in air ducts or blower packs (remote mounted: RMBP) for direct space humidification.

Water enters the steam cylinder through the bottom via the fill cup assembly when the 24 volt fill valve solenoid is energized. The water is heated via electric element and produces sterile steam for distribution into the air.

Primary electric power is applied to the heating elements in the steam cylinder when the on/off switch is pushed on and all control options are calling. A primary to 24 volt step-down transformer provides power to the contactor holding coil(s) via the main

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STEAM GENERATION REGULATION

The steam is produced in the steam tank by

resistive heating element technology. An external or the internal regulator for connection as required control the steam production fully variably from 3 to 100%.

FLUSHING - NHSC ONLY

The evaporation process increases the

concentration of minerals in the water of the steam cylinder. A suitable volume of water must be flushed through the steam cylinder from time to time and replaced by fresh water to ensure that this concentration does not exceed a specific value unsuitable for operation. The NHSC / NHDI steam humidifier performs a flush cycle. This consists of the following two forms of flushing.

Automatic flushing takes place as soon as the

• water in the steam cylinder exceeds the upper operating level (e.g. By foaming of the water).

Flushing is a time dependent process at

• preselected time intervals.

Automatic or time-dependent flushing takes place

based on the water quality and the operating data.

SCALE COLLECTOR TANK - NHSC ONLY

The minerals precipitated by the evaporation process accumulate at the bottom of the steam cylinder. Units designed for operation with untreated water are equipped with a scale collector tank located directly underneath the steam cylinder. This way the minerals do not accumulate in the steam cylinder but mainly in the collector tank thus extending the service intervals and reducing the maintenance costs.

NHSC / NHDI OPERATION

Ensure the valve on the NHSC mineral tank is

• closed.

Switch on the steam humidifier main switch.

•

The steam humidifier carries out a system test. The display below appears and the three LEDs light for approx. 3 seconds.

test

If a fault is detected during the system test, a corresponding fault message is triggered.

If the system test is successful, the steam cylinder fills up and a float test is carried out (function check on the level unit). The display below appears.

filling

Note: If a fault is detected during the float test, an appropriate fault message is triggered

If the float test is successful, the NHSC / NHDI will be in normal operating mode. The display below appears and the green LED lights.

The following procedure should be carried out only on the first occasion that the unit is operated:

NHSC/DI

ready

• Check the function of the steam humidifier:

•

Switch on the humidification by raising the set humidity value on the humidity controller / humidistat / NHSC / NHDI Display.

•

Switch off the humidification by lowering the set humidity value on the humidity controller / humidistat / NHSC / NHDI Display.

STARTING OPERATION

The following procedure should be carried out in order to operate the steam humidifier:

•

Examine the steam humidifier and installation to ensure it has been installed properly or for possible damage.

Caution! Damaged units and units with improper installation must not be operated.

•

Open the filter valve / shut-off valve in the water feed line.

•

Switch on the external disconnect for the main supply (Heating and control voltage).

•

Check for correct functioning of the monitoring equipment (external safety network).

•

Set the desired humidity value on the humidity controller/humidistat.

•

Make sure no leaks are present.

The heating current switches on as soon as the humidity controller/humidistat demands humidity. The yellow LED lights and steam is produced after a short delay (approx. 5 minutes).

Operating status display on the unit

The operating status is displayed in the LED on the unit as follows:

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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 (option ”RFS”), the operating status will be shown as follows:

K1 Steam (N/O) Normally open

K2 Error (N/O) Normally open

(N/C) Normally closed

K3 Service (N/O) Normally open

(N/C) Normally closed

K4 Unit On (N/O) Normally open

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INTERROGATION OF THE OPERATING

STATUS

The NHSC / NHDI operating and display unit has

a “display menu” from which various operating parameters can be viewed.

Note: It is not possible to change the values on the

display level.

Operation

Call up the display level with <ê>or<é>.

<ê> next operating parameter.

<é> previous operating parameter.

Exit the display level with <Menu>

Internal Controller

Controller funct

off

Internal controller activated (”on”)/deactivated

(”off”)

Working Hours

elapsed time

623

Total of working hours elapsed since initial

commissioning of the steam humidifier.

Time Remaining to minor/major service

time to mainten.

600/1200

The time remaining (in hours) before the next

minor/major service.

Description of the operating parameters on the display level

The following describes the individual operating

parameters that can be selected using the keys <ê> and <é>, after the display level has been called up.

Steam Productions

steam-prod[%]

ref.=50/act=25

Current actual and nominal value of steam

production in percentage of total output.

Nominal value: Unit capacity x input signal value.

Actual value: max. Unit capacity x input signal

value x capacity limitation.

Note: If the internal controller is activated only the

actual value is shown.

Under the following conditions the actual value

may differ from the nominal value: upon activation of the heating power, if capacity limitation is active during the filling cycle of the steam cylinder.

Can be increased for poor water conditions or

decreased for good water conditions.

Figure #17

NHSC / NHDI Maintenance Intervals

Analog Input (humidity demand)

Analog input [%]

Current value of the signal applied to the analog

input in % of its max. value.

Note: If the internal controller is active the

displayed value corresponds to the current air humidity (%rh).

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Note: The stated times are based on 100% steam capacity. If the operation is at a lesser capacity, the time should be extended accordingly. The servicing intervals are set using the rotary switch “S2” on the control board.

Drain Cycle

drain cycle

4: 120

The following indications are provided for the set flushing interval:

Left: Switch setting on rotary switch “S1”

Right: Set flushing interval

Note: Water quality conditions resulting in component failures are not covered under Nortec’s standard warranty.

The factory settings are based on the following water conditions when the unit leaves the factory.

Water

NHSC NHDI

Parameters

Conductivity 0-1500 MicroMhos 0-50 MicroMhos

Hardness 12 grains per gallon

(gpg)

0 grains per gallon (gpg)

Note: The flushing interval is set on switch “S1” on

the control board.

Figure #18

NHSC / NHDI Drain Cycle Parameters

ValueSettings

Position Drai n Inte rval At 100%

S1 Steam Capacity

00Min. 1 720 Min. 2 360 Min. 3 180 Min. 4 120 Min. 560Min. 630Min. 720Min. 810Min. 95Min.

Factory Settings

NHSC - DI NHSC(S1) NHDI (S1)

Model Setting Setting

010 4 1 015 4 1 020 5 1 030 6 1 045 7 1 065 8 1 090 8 1 135 8 1 180 8 1

NHSC/NHDI Main Board

Silica 12 parts per million

(ppm)

0 parts per million (ppm)

PH 6.5-7.5 7

Chlorides > 50 parts per mil

lion (ppm)

> 25 parts per mil

lion (ppm)

Note: Should you have water conditions above the stated parameters consult the factory for a new blowdown setting to help improve your scale management.

Chlorides

– High levels of chlorides will attack stainless steel. The solution would be to add an in-line carbon filter that will remove up to 99% of the chlorides. Consult the factory for additional information if your water contains high levels of chlorides.

Nortec recommends performing a semi-annual

water analysis to ensure optimal performance.

Stand-by Heating

stand-by heating

off

Drain Interval (S1)

Example:

Position

4:120

NOTE: Approximately 1 liter or

0.26 gallons will drain during these intervals. Drain Water Cooling will be active during these intervals to temper the drain water to 140 degrees F (60 degrees C) or less.

LCD Display

Duration between drain cycles

Stand-by heating activated (”on”) deactivated

(”off”).

Note: If stand-by heating is active the water temperature in the steam cylinder is constantly kept at approximately 70ºC (158ºF) by the control board.

Capacity Limitation

power limit [%]

100

The set capacity limitation as a percentage of the maximum capacity. Press both arrow keys at the same time and a code will appear. Enter 8808 using the arrow keys on the keypad and scroll down to the

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power limit screen. To change the power limit, simply press the down aroow key to desired capacity and press enter to save that new value. Press menu key to exit parameter screen.

Inlet Valve Correction

inlet valve cor.

130

Set inlet valve correction (cycle ratio) in % of standard setting value to balance out water pressure variations.

Figure #19

NHSC / NHDI Control Interval

Soft Start

Off

Soft Start activated (on), consult factory.