Nortec 132-3091 User Manual
NH Electrode
Steam Humidifiers
Installation,
Operation, and
Maintenance Guide
IMPORTANT: Read and save these instructions. This
guide to be left with equipment owner.
Form #03-172 1506262
Table Of Contents
INSTALLATION 1
RECEIVING & UNPACKING EQUIPMENT ................................1
PRE-INSTALLATION CHECKPOINT ...................................1
BASIC HUMIDIFIER CONFIGURATION..................................1
LOCATION & MOUNTING .........................................2
HUMIDIFIERS ...............................................2
BLOWER PACKS .............................................2
STEAM DISTRIBUTORS..........................................3
PLUMBING .................................................3
WATER SUPPLY LINE...........................................3
DRAIN LINE ................................................3
STEAM LINE AND CONDENSATE RETURN LINE ............................4
ACCESSORIES - FILL CUP EXTENSION KIT(S) .............................4
ELECTRICAL................................................4
PRIMARY VOLTAGE SUPPLY WIRING TO HUMIDIFIER ........................4
LOW VOLTAGE CONTROL WIRING ...................................5
On-Off Controls.............................................5
CONTROL INSTALLATION ........................................5
OPTIONAL MODULATION (CONTINUOUS CONTROLS) ........................5
OPTIONAL MODULATION (CONTINUOUS CONTROL) PACKAGES BY NORTEC ...........7
OPERATION 7
INTRODUCTION ..............................................7
LAYOUT AND FUNCTION .........................................7
NHMC OPERATION ............................................8
START-UP SELF TEST ..........................................8
USER LEVEL................................................9
INFORMING THE USER ..........................................9
SELF-HELP ................................................9
SYSTEM MESSAGES ...........................................9
REMOTE INDICATION...........................................9
DOUBLE UNIT OPERATION .......................................9
NHB/NHP OPERATION ..........................................9
END OF CYLINDER LIFE .........................................9
MANUAL CAPACITY ADJUSTMENT...................................10
OTHER POTENTIOMETERS.......................................10
DETECTING WATER SUPPLY DEFICIENCY ..............................10
REMOTE INDICATION ..........................................10
DOUBLE UNIT OPERATION .......................................10
BLOWER PACK OPERATION ......................................10
MAINTENANCE 10
WHEN TO REPLACE THE STEAM CYLINDER .............................10
HOW TO REMOVE THE STEAM CYLINDER ..............................13
MANDATORY CLEANING OF THE DRAIN VALVE ...........................13
HOW TO INSTALL THE REPLACEMENT CYLINDER ..........................14
BUILT ON AND REMOTE MOUNTED BLOWER PACKS (BOBP’S / RMBP’S) .............15
TROUBLESHOOTING 15
STARTING POINT ............................................15
USING THE WIRING DIAGRAM .....................................21
TERMS USED ..............................................22
WIRING DIAGRAM ..........................................23-25
PRE START-UP CHECKLIST ......................................26
START-UP CHECKLIST AND QUICK REFERENCE...........................27
MAINTENANCE CHECKLIST .....................................28-29
REPLACEMENT PARTS .......................................30-35
INSTALLATION
pply
3. Report any discrepancy immediately.
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 nameplate label (see
Figure #1).
2. Ensure that the dedicated external disconnect is of
sufficient size to handle the rated amps as
indicated on the nameplate label. Refer to local
codes.
BASIC HUMIDIFIER CONFIGURATION
NORTEC humidifier models NHMC, NHP and
NHB 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 also be
removed for ease of electrical connection. For safety,
the door when closed keeps the side cover from being
removed.
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
which is not intended to be removed. For safety, the
door must be closed in order to engage the shared
lock. To avoid any danger, never operate the
humidifier with a door off. For safety, each door when
closed engages its own safety interlock switch. All
switches must be engaged before the unit will operate.
To open the doors, unlock key, 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.
Condensate
Return
Figure #1
NH Series Humidifier
Steam
Outlet
Drain
Nameplate
Label
Water
Su
Power And
Control
Wiring
Clearance Requirements
WALL
WITHOUT BLOWER PACK
TOP VIEW
NOTE: LOCAL AND NATIONAL
CODES MAY DEVIATE. PLEASE
CONSULT APPLICABLE CODES
FOR CLEARANCE REQUIREMENTS
IN ALL CASES.
Figure #2
MIN. 36"
FRONTAL
CLEARANCE.
MIN. 36"SIDE
CLEARANCE
RECOMMENDED.
SEE NOTE.
-1-
LOCATION & MOUNTING
g
HUMIDIFIERS
NH Series humidifiers are designed to mount on a
suitable wall or vertical surface. Do not sit 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 can not accept responsibility for installation
code violations.
1. Location of the humidifier should be below and as
close as possible to the steam distributor location
as possible.
2. For front and side clearance requirements (for
access during installation, maintenance and
troubleshooting), see Figure #2.
3. If possible, DO NOT locate humidifier any further
than absolutely necessary from steam distributor
location, as net output will be reduced as a result
of heat loss through steam hose (see Engineering
Manual, Form -163D). Also, increased static
pressure may necessitate using an accessory fill
cup extension kit.
4. Where possible, mount humidifier at a height
convenient for servicing.
5. Wall mounting bracket provided should be
securely attached horizontally and open edge
upwards, using field-supplied fasteners. Use a
minimum of 3 - #12 x 3" long wood screws, or
Figure #3
Wall Bracket Mounting Detail
WALL
Wall
better, into a vertical structural surface. 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 #3.
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 cabinet by
others should be used. Consult factory.
9. DO NOT mount humidifiers in an area where
freezing may occur. Use an accessory Low
Temperature Protection Kit, if necessary.
10. DO NOT mount humidifiers on vibrating surface.
Consult factory.
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.
2. Blower packs are available integrally-mounted on
humidifier (built-on blower pack, BOBP, see Figure
#4) or detached and field-piped and wired to
humidifier (remote mounted blower pack RMBP,
see Figure #5).
Figure #4
Built On Blower Pack (BOBP)
Optional
Built-On
Blower Pack
Single
Circuit
Humidifier
Built-In
Supply Air
Grille
Built-In Steam
Distributor
Fasten wall bracket
FASTEN WALL BRACKET
(FACTORY SUPPLIED) TO
(Factory supplied) to
WALL USING ANCHOR BOLTS
wall using field supplied
(3) SUPPLIED BY OTHERS
fasteners.
005-030
7.7 (19.6cm)
050-200
7.7 (19.6cm)A
7.7”
A
(19.6 cm)
3. All NH Series blower packs consist of a steel
cabinet containing: blower/motor powered by
voltage directly from the humidifier, fuse, relay,
speed select switch (in NH-050 and larger),
stainless steel steam distributor, supply air grille
with adjustable louvers, and built-in manual reset
-2-
Power And
Control
Wirin
Wall
Figure #5
)
Remote Mounted Blower Packs (RMBP)
Side
050-100
3.2" (8.0cm)
Condensate
Front
Steam
A
Power and control
wiring from humidifier
005-030
3.2" (8.0cm)
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,
blower pack will contain a proper transformer. All
blower packs provide intake air filters.
For installation details about the blower pack,
please refer to the blower pack installation manual
located in the blower pack box (Form #XX-239).
WATER SUPPLY LINE
1. Humidifier is intended to operate on potable (cold)
tap water.
2. If the raw water is very hard, NORTEC can
A
provide longer cylinder life on softened water.
However, softened water is more conductive and
more corrosive. Some hardware and/or software
changes may be required, at time of order or in the
field. Consult factory.
3. If RO or DI is available, blending may increase
cylinder life. Consult factory.
4. DO NOT use a hot water supply to humidifier.
Minerals will adhere more easily to surfaces and
the fill valve’s small flow regulating orifice and
could become plugged.
5. Standard fill valves are sized for water pressure
ranging from 30 to 80 psig (ideally 55 to 60 psig).
For other pressures, consult factory. This
pressure should be measured at the humidifier if
the water pressure is suspect.
6. ALWAYS supply and install a shut off valve in the
water supply line dedicated to the humidifier to
facilitate servicing. Use ½" OD copper to within 4
feet of the humidifier. Reduce copper to 3/8" OD
and connect to the factory-supplied 3/8" olive
compression fitting under the humidifier.
DRAIN LINE
STEAM DISTRIBUTORS
1. Steam distributors are used in ducts or air
handling units, and are made of stainless steel.
2. Steam distributors can be in vertical or downflow
applications.
3. Proper location should consider: air temperature,
relative humidity before the distributor, air velocity,
dimensions of the location, amount of steam
introduced into the duct, downstream obstructions,
and surfaces vulnerable.
4. For installation details, please refer to steam
distributor installation manual located in the
distributor box (Form #XX-231).
5. For calculating absorption distances, refer to
H.E.L.P. Software or steam distribution and
absorption distances engineering manul (Form
#XX-232).
PLUMBING
All water supply and drain line connections
should be installed in accordance with local
plumbing codes.
1. Humidifier is equipped with a 7/8" O.D. unthreaded
drain outlet on underside of drain canal on bottom
of the humidifier (see Figure #6). A field-supplied
funnel (see Figure #7) 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 and
arcing due to over-concentration. The drain canal
Figure #6
Drain Line Connection
A
B
Model
005 -030
050 -100
150 -200 Left
150 -200 Right
Bottom View
Ain.(mm)
1.0 (25)
2.2 (55)
2.2 (55)
2.2 (55)
B in.(mm)
5.0 (127)
6.2 (158)
6.2 (158)
19.6(498
Wall
-3-
has been improved to prevent backup despite long
e
A
or gently sloped drain lines but it can not
compensate for flat or uphill runs.
2. 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.
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 7/8" O.D. copper pipe or larger. Do not
use plastic pipe for drain lines. Consult factory.
Figure #7
Drain Connection
ClampAnd
1.5” I.D.Hose
ir Gap
NOTE: Steam hose should not reach bottom of the funnel.
Factory Supplied
Stainlesssteel Reducer To
ServeAs Funnel
Drain (ByOthers)
2" O.D. StainlessSteel Pipe
Or 2" I.D.DI Compatible Hos
(Not Supplied)
4. To increase allowable water column (allowable
positive static pressure) an accessory Fill Cup
Extension Kit is available from NORTEC. See
Figure #8.
Figure #8
Fill Cup Extension Kit to Overcome Static Pressure
Fill Cup Bracket
Fill Cup
Overflow Hose
Fill Hose To
Cylinder
Hose From FillValve
5. Water column requirements are even higher duct
static pressure when distributor’s steam outlets
are faced with downflow duct applications.
ELECTRICAL
PRIMARY VOLTAGE SUPPLY WIRING TO
HUMIDIFIER
STEAM LINE AND CONDENSATE RETURN LINE
1. Check and ensure that available voltage and
phase corresponds with operating voltage and
1. Refer to the installation manual of the steam
distribution system used in your application.
phase of humidifier as indicated on the humidifier
nameplate label (see Figure #1).
Steam Distribution - Form #XX-231, SAM-e - Form
#XX-249, Blower Pack - Form #XX-239.
2. Ensure that an adequate power supply is available
to carry full humidifier amperage drawn as
ACCESSORIES - FILL CUP EXTENSION KIT(S)
1. The NH Series humidifier is an electrode
humidifier. It produces steam at atmospheric
pressure. Pressure head must develop to push
steam through supply line and into air duct.
2. Combined resistance of duct positive static
pressure and steam line resistance creates a
small pressure head in steam cylinder. Total
amount of positive static pressure head is
reflected directly by water column differential that
develops between water in the fill cup hose
feeding cylinder and water level in cylinder.
3. Standard dimensions of humidifier limit static that
can be tolerated before water will be pushed high
enough to spill over into overflow tube in fill cup
assembly.
specified by rated amps on the humidifier
nameplate label refer 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.
4. Optional internal primary fuses are not intended to
substitute for external fuses. Internal primary
fuses are a factory added option (when specified)
to protect internal primary wires individually.
5. Connect ground wire to cabinet ground clamp. Do
not use neutral wire of four wire supply as ground.
6. Single phase humidifiers may be run on three
phase power, but load may unbalance power grid.
7. External wiring sizes must be in accordance with
NEC and/or CEC and existing local electrical
codes and by-laws.
-4-
LOW VOLTAGE CONTROL WIRING
On-Off Controls
Figure #9
External Wiring of On/Off Controls
A
B
C
4. Each humidifier is supplied with a wiring diagram
inside.
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.
EXTERNAL
810
INTERNAL
Controls are available from NORTEC as
accessories. If controls were not ordered with
humidifier, they must be purchased supplied by others.
The following information is relevant to all controls,
factory supplied or otherwise.
A, B and C (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 metal.
A - Wall or Duct Mounted Control On/Off
Humidistat: Wired to make on drop in humidity, break
on rise to setpoint. 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 setpoint. 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 when sensing air
flow, break when no air flow. Used as a safety to
prevent saturation when no air flow.
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.
2. Mount duct humidistat in location representative
of overall air humidity, usually return duct. Do not
mount it directly in front of steam distributor or in
turbulent or mixing zone. Mount it where air’s
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 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.
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 setpoint circuitry) may be interfaced with
pre-specified factory-configured NHMC/NHP
Series pc board via the control terminal strip. The
NHB can be used with on-off control only. Use
shielded cables for modulation circuits.
3. Modulation (continuous control) by others for use
with NHMC/NHP Series humidifiers involves one
of several control wiring diagrams. In all cases,
modulating signal interfaces through control
terminal strip to main pc board inside humidifier.
4. The modulation signal must increase from
minimum toward maximum as sensed RH (actual
RH) drops below desired RH (%RH setpoint). 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.
-5-
l
l
l
(ACTUAL)
Figure #10
Primary Voltage Supply Wiring
PRIMARY (LINE) VOLTAGE WIRING TO UNITVOLTAGE
(BY OTHERS)
L1
L2
- Single Phase Unit.
- Single Phase Supply.
- Required Voltage Between L1 And L2.
- Load Balanced.
L1
L2
L3
Neutral
L1
L2
L3
Neutral
Ground
Ground
- Single Phase Unit.
- 3 Phase Supply.
- Required Voltage Between L1 And L2.
- Load Will Be Unbalanced.
Ground
- Single Phase Unit.
- 3 Phase Supply.
- Required Voltage Between L1 And Neutral.
- Load Will Be Unbalanced.
Ground Wire
Dedicated
Disconnect
Ground Wire
Dedicated
Disconnect
Ground Wire
Dedicated
Disconnect
Circuit
Breaker
Or
Circuit
Breaker
Or
Circuit
Breaker
Or
Ground
Leg
2 Pole
Termina
Block
E
I
X
N
T
T
Ground
Leg
2 Pole
Termina
Block
E
I
X
N
T
T
Ground
Leg
2 Pole
Termina
Block
E
I
X
N
T
T
Ground Wire
L1
L2
L3
Neutral
Ground
Dedicated
Circuit
Breaker
Or
Disconnect
- 3 Phase Unit.
- 3 Phase Supply.
- Required Voltage Between Any Two Legs.
- Load Will Be Balanced.
NOTE: VoltageAt TerminalBlockMust Be InAccordance WithSpec.Label.
All Wiring ToBeInAccordance With Existing NationalAnd LocalElectrical Codes.
-6-
Ground
Leg
3 Pole
Terminal
Block
E
I
X
N
T
T
5. Field-wiring connections for modulation control are
to be made to external side of terminals 26, 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.
6. Varying dc Voltage Modulation Signal Powered
by Others: NHMC/NHP Series humidifier can be
factory configured to accept the following vdc
signals: 0-3 vdc, 0-10 vdc, 0-16 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.
7. Varying dc milliAmp (mA) Modulation Signal
Powered by Others: NHMC/NHP Series
humidifier 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.
8.
Varying Resistance (W) Modulation by Others:
NHMC/NHP Series 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 0-135W, 0-500W or up to
0-1000W. To share the signal with more than one
humidifier consult factory.
pre-selected when ordering the option. NORTEC
offers several packages for NHMC/NHP Series
humidifiers. Wire according to NORTEC supplied
external wiring that comes with each optional
modulation package.
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 NH Series humidifier is a
completely new design based on up-to-date
technology. The NHB is designed to provide clean
steam humidification at an economical price. It utilizes
NORTEC’s patented electronic Auto-Adaptive internal
control system for high efficiency, low waste of water
and electricity.
The NHP and NHMC utilize NORTEC’s patented
P+I Auto-Adaptive control for greater control of the
space humidity. Both the NHP and NHMC use a
micro-computer control system for greater flexibility.
The NHMC has a liquid crystal display (LCD) to
indicate system messages, display RH and
temperature. The NHMC can accept dual modulation
signals and is NORTEC’s most advanced model.
OPTIONAL MODULATION (CONTINUOUS
CONTROL) PACKAGES BY NORTEC
1. Modulation (continuous control) “packages” are
offered as accessories by NORTEC. Power
supply comes from inside NHMC/NHP Series
humidifiers.
Figure #11
Generalized Modulation Wiring
VariesWith Each
Modulation Option
See NORTECSupplied
External Wiring Diagram
_
y
z
+
NHMC/NHP
External
Internal
A
B
C
810 32 30 28 26
2. NORTEC provides the humidity set point circuitry
and sensor(s) for wall or duct mounting or both
(only applies to NHMC. NHP is only capable of
single channel continuous control modulating) as
LAYOUT AND FUNCTION
The NH Series 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 (built on: BOBP, remote
mounted: RMBP) for direct space humidification.
Water enters the steam cylinder through the
bottom via the drain valve from the fill cup assembly
when the 24 volt fill valve solenoid is energized. When
water submerges the electrodes, the minerals in the
water conduct current that heats the water and
produces sterile steam for distribution into the air. The
minerals in the water remain in the cylinder which is
periodically drained to maintain optimum performance
and cylinder life.
Primary electric power is applied to the electrodes
in the steam cylinder when the on/off switch is pushed
on and all controls options are calling. A primary to 24
volt stepdown transformer provides power to the
contactor holding coil(s) via the main control board.
The humidifier’s operating status is reported to the
user by the green and yellow indicator lights on the
front of the unit as shown in following table.
-7-
SIGNAL LIGHT STATUS
NHMC OPERATION
YELLOW GREEN
OFF OFF Off
OFF ON Normal operation
ON ON Replace cylinder or normal
startup operation
ON OFF Operation fault
The prerequisites for getting power and water into
the steam cylinder are as follows:
on/off/drain switch must be switched on
-
control circuit 8-10 must be made
-
modulation humidistat, if present, must be calling
-
control circuit 82-83 must be made
-
control circuit 84-85 must be made
-
cabinet mounted humidistat, if present, must be
calling
- door interlock switch must be made (interlock switch
can be pulled out to operate unit)
START-UP SELF TEST
Observe the LCD display when the on/off/drain
switch is first pushed on. The microcomputer pc board
will check the system components, display in words
what it is doing and provide a message if any faults
are found. The start-up self-test sequence will be
displayed as follows:
LCD EXPLANATION/COMMENTS
(WHAT YOU READ)
CONDAIRMATIC MC Note the V number. It tells you
the EPROM version.
NORTEC V2...
CONDAIRMATIC MC Note the model type. Ensure
NHMC (model type) compatibility
with spec label (name plate).
Can be reconfigured if
necessary.
SYSTEM TEST Test begins.
LAMP GREEN Observe green signal light on
LAMP YELLOW Observe yellow signal light on
Most water does not contain enough conductivity
for full boil on initial start-up. Units will need to
concentrate the water over a time period (hours to
days). During this process both lights are on.
CONTACT RELAY 1 Provides 24 VAC to 61-20 and
DRAIN VALVE Observe 24 volt solenoid
INLET VALVE Observe 24 volt solenoid
CONTACTOR Observe 24 volt coil activated
CONTACT RELAY 2 Provides 24 VAC to 63-36 and
CONTACT RELAY 3 Provides 24 VAC to 62-40 and
INTERNAL TEST Completion of self test.
LAMP
GREEN-YELLOW
INTERNAL TEST
external optional yellow lamp at
control strip to simulate a fault.
activated on drain valve.
activated on fill valve.
on contactor OR fan activated on
blower pack if present.
external optional red lamp at
control strip to simulate cylinder
spent.
external optional green lamp at
control strip.
Observe green and yellow
lamps pulse on together as sign
that all passed.
-8-
STEAM OUTPUT
INTERNAL TEST
sensor, the LCD will read “MAXIMAL LEVEL”.
NOTE: If cylinder water reaches the full cylinder
Begins normal operation and
displays lbs/hr.
USER LEVEL
REMOTE INDICATION
The keypad has four keys: MENU, é , ê,
ENTER.
Each time the user presses the menu key, the
microcomputer will display on the LCD the next
operating parameter on the menu. The basic display
will read:
Steam output (lbs/hr)
-
Capacity demand
-
Limited capacity
-
Control signal y
-
The display loops back to the top of the menu the
next time the user presses the menu key. As
NORTEC software updates are incorporated, new
parameters will automatically be added to the menu.
INFORMING THE USER
The microcomputer continually monitors the
operating status and informs the user in four ways.
The first (signal light status), second (optional external
lamps tied to the control strip) and third (operating
parameters displayed on the alphanumeric LCD
display) have been discussed. The fourth way is to
interrupt the LCD and display a system message. It
only does this as a last resort.
SELF-HELP
The microcomputer applies corrective actions
whenever its self-diagnostics identifies a problem that
it is able to correct by itself. If the corrective action is
not successful then it displays a system message. If
the corrective action requires a service person, then
the microcomputer’s only resort is to stop the unit and
display a system message. The unit never stops
unless it has to.
After three days of no call from either the on/off
controls or the modulating controls, the drain valve is
automatically activated long enough to drain all water
from the steam cylinder. This NORTEC exclusive
feature will prolong the life of the cylinder.
SYSTEM MESSAGES
Alphanumeric system messages will appear on
the LCD display any time the microcomputer decides
the user must be informed. The microcomputer does
not stop the unit for all system messages. (See the
Troubleshooting Section in this manual)
The NHMC is always internally wired to provide 24
VAC to the terminal strip for optional external remote
indication. Up to 100 milliamps is available at each of
three terminal pairs (61-20, 62-40, 63-36) for activating
yellow, green and red lamps ordered as options from
NORTEC or for powering field-supplied resistive loads
such as lamps.
DOUBLE UNIT OPERATION
Turn both switches on. During start-up self test
both sides respond to the self test together. Watch for
the lamps to light and the drain, fill and contactor to
energize as described on page 15. The LCD,
however, only indicates the left circuit [1].
After the self test, the LCD will display the steam
output for the left side [1] and both sides will operate
normally.
To alternate between parameters for the left side
[1] and parameters for the right side [2], press the
Enter key.
Use the MENU key to see other parameters
besides steam output. To display steam total output
for both sides press the enter key until [S] is displayed.
When a fault occurs on the right side of the double
unit, both sets of lamps (and remote relays) will come
on indicating that a fault has occurred. The left
[master] will display its own faults.
The LCD will indicate which fault has occurred and
on which side of the unit, [1] or [2]. The side not
faulted will continue to operate as usual.
Display is not available for the right side [2] if the
left side is switched off.
NHB/NHP OPERATION
END OF CYLINDER LIFE
When the cylinder is used up and water level can
no longer stabilize below full cylinder (due to fully
coated electrodes), the yellow light will come back on,
in addition to the green light. The disposable cylinder
must be replaced.
Although “both lights on” is the same signal at
start-up as it is at end of cylinder life, the age of the
cylinder enables the user to know when “both lights
on” is indicating end of cylinder life. It is wise to keep
a new replacement cylinder on hand to avoid
downtime when it becomes time to change the
disposable cylinder. (See Troubleshooting section.)
-9-
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