Nortec NHU Series Humidifier Owners Manual

Nortec NHU Series Humidifier Owners Manual
NHU Electrode
Steam Humidifiers
Installation, Operation,
Maintenance and
Troubleshooting Guide
IMPORTANT: Read and save these instructions. This
guide to be left with equipment owner.
Form 98-141 rev 1
Table Of Contents
INSTALLATION
1
RECEIVING & UNPACKING EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
PRE-INSTALLATION CHECKPOINT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
HUMIDIFIER CONFIGURATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
LOCATION & MOUNTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
HUMIDIFIERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
STEAM DISTRIBUTORS FOR DUCTED APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . 2
PLUMBING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
WATER SUPPLY LINE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
DRAIN LINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
STEAM LINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
CONDENSATE RETURN LINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
ELECTRICAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
PRIMARY VOLTAGE SUPPLY WIRING TO HUMIDIFIER . . . . . . . . . . . . . . . . . . . . . . . . 6
LOW VOLTAGE CONTROL WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
On-Off Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
CONTROL INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
OPERATION
7
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
NHU OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
END OF CYLINDER LIFE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
MANUAL CAPACITY ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
OTHER POTENTIOMETERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
MAINTENANCE
8
WHEN TO REPLACE THE STEAM CYLINDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
NHU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
HOW TO REMOVE THE STEAM CYLINDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
MANDATORY CLEANING OF THE DRAIN VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
HOW TO INSTALL THE REPLACEMENT CYLINDER . . . . . . . . . . . . . . . . . . . . . . . . . . 9
EXTENDED SHUTDOWN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
TROUBLESHOOTING
10
TERMS USED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
STARTING POINT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
UNIT WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
SPARE PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.
INSTALLATION
HUMIDIFIER CONFIGURATION
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.
To avoid any danger, never operate the
humidifier with a door off. All switches must be
engaged before the unit will operate.
To open the door, unlock door with key, lift door up
slightly and pull door forward.
LOCATION & MOUNTING
HUMIDIFIERS
NHU 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 cannot accept responsibility for
installation code violations.
PRE-INSTALLATION CHECKPOINT
1.
Ensure that available voltage and phase
corresponds with humidifier voltage and phase
as indicated on humidifier’s nameplate label.
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.
1.
Location of the humidifier should be below and
as close as possible to the steam distributor
location.
2.
For front clearance requirements (for access
during installation, maintenance and
troubleshooting), see Figure #2.
Figure #2
Clearance Requirements
Figure #1
NHU Series Humidifier
Condensate
Return
Report any discrepancy immediately.
Wall
Steam
Outlet
NOTE: Local and national
codes may deviate. Please
consult applicable codes
for clearance requirements
Nameplate
Label
3.
Drain
PowerAnd
Control
Wiring
Water
Supply
-1-
Min. 36"
Frontal
Clearance
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.
4.
Where possible, mount humidifier at a height
convenient for servicing.
STEAM DISTRIBUTORS FOR DUCTED
APPLICATIONS
Figure #3
Wall Mounting Detail
Wall
1.
The steam distributor is typically located in the
supply air duct, return air duct and 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.
2.
When steam distributors are located in a duct
they should be in a straight section of duct at
least 6 feet (2 meters) from any elbow or
obstruction. If the duct or plenum conditions
result in poor absorption distance
characteristics, please consult your local
representative or the factory.
3.
Steam distributors should always span the width
of the air stream.
4.
Exercise extreme caution when installing in fiber
glass or internally lined ducts. Care must be
taken to ensure insulation does not absorb
moisture.
5.
Low temperature ducts below 60°F (15°C),
shallow ducts, or branch ducts might require the
use of a field supplied condensate drain pan
below the steam distributor. See Figure #5.
0.6” (1.6cm)
Fasten Humidifier To
Wall Using Screws 2” long
(2) supplied by other
12.1” A(30.7cm)
5.
Make sure humidifier is level.
6.
DO NOT mount humidifier on hot surfaces.
7.
DO NOT mount humidifiers in an area where
freezing may occur.
8.
DO NOT mount humidifiers on vibrating surface.
Consult factory.
9.
Figure #5
Condensate Drain Pan
To mount the humidifier you must first remove
the steam cylinder from the unit (see page 8 HOW TO REMOVE THE STEAM CYLINDER).
With the cylinder removed use two #8 screws (2”
long) and secure to a 2x4” stud (or similar).
Once the humidifier has been mounted replace
the steam cylinder following the procedure
outlined on page 9 - HOW TO INSTALL THE
REPLACEMENT CYLINDER.
Shallow Duct
Drain Pan
T-Bar Ceiling
To Drain
Branch Duct
Figure #4
Steam Distributor Location
6'
Min.
6.
The steam distributor mounting plate is
perpendicular to the steam distributor. When
the mounting plate is attached to the side of the
duct, the distributor is level. An upward or
downward slope to the distributor will result in
poor condensate drainage and “spitting” of
condensate in duct. See Figure #6.
7.
It is recommended that distributors be that
mounted near the bottom of the duct to ensure
the steam is dispersed into the majority of the air
flow. See Figure #9.
6'
Min.
Mount Steam Distributor
At Least 6' (2 M) From Elbow
Multiple Steam Distributors
Can Reduce This Distance
-2-
Figure #9
Single Steam Distributor Installation
Figure #6
Leveling Distributor
2/3 H
W/2 W/2
H
1/3 H
Wrong
A
H
W = 8" min.
B
Support
(If Needed)
Correct
Always
Mount
Level
S.D. H min.
A
B
ASD
4.125" 3.875"
8"
A
H
B
S.D. H min.
ASD
6"
Wrong
8.
Figure #7
Distributor Support
3/8" Threaded Rod
(Field Supplied)
A
3.25"
B
2.75"
Using duct mounting template provided, cut a
hole in side of duct just large enough to admit
steam manifold and condensate drain pipe
assembly. Use four sheet metal screws to
attach mounting plate to side of duct. See
Figure #8 and #9.
PLUMBING
All water supply and drain line connections should
be installed in accordance with local plumbing codes.
WATER SUPPLY LINE
Duct
Steam Distributor
Hex Nut
Factory Attached
1.
Humidifier is intended to operate on potable
(cold) tap water.
2.
If the raw water is very hard, NORTEC can
provide longer cylinder life on softened water;
however, softened water is more conductive and
more corrosive. Some hardware changes may
be required, at time of order or in the field.
Consult factory.
3.
Reverse osmosis (RO) and Deionized (DI) water
can provide very long cylinder life since it is
cleaner than softened water. However, it is also
more corrosive and it is a poor conductor of
electricity. Consult factory. Deionized (DI)
water simply does not conduct electricity and it
is inappropriate for use with electrode steam
humidifiers.
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.
Figure #8
Cutting Duct For Mounting
1.
2.
3.
1. Steam Distributor Mounting Plate
2. Cut Hole In Duct For Insertion Using Template
3. Mount With Four Sheet Metal Screws
-3-
5.
codes prohibit it. Route to a floor drain or
equivalent for safety reasons, since drain water
from humidifier can be very hot.
ALWAYS supply and install a shut off valve in
the water supply line dedicated to the humidifier
to facilitate servicing. Use 1/2" O.D. copper to
within 4 feet of the humidifier. Reduce copper to
3/8" O.D. and connect to the factory-supplied
3/8" olive compression fitting under the
humidifier.
3.
DRAIN LINE
1.
Humidifier is equipped with a 7/8" O.D.
unthreaded drain outlet on underside of drain
canal on bottom of the humidifier. A
field-supplied funnel (see Figure #10) is
recommended. It will prevent backup in the
drain pan and in the cylinder due to partially
blocked or poorly installed drain lines. This
prevents rusting of the drain pan and arcing due
to over-concentration. The drain canal has been
designed to prevent backup despite long or
gently sloped drain lines but it cannot
compensate for flat or uphill runs.
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.
STEAM LINE
1.
Field-supplied hard copper with 1/2" thick
snap-on insulation is recommended for steam
supply, with NORTEC supplied steam hose
coupling used to make connection to cylinder.
See Figure #12.
Figure #12
Steam Line Connection
Clamp To Steam Distributor
Or Remote Blower Pack
Figure #10
Drain Connection
See Section On
Condensate
Return Line
ClampAnd
7/8" I.D. Hose
Factory Supplied
Air Gap
Trap
Field Supplied
Insulated Hard
Copper Pipe
Or Flexible
Steam Hose
Available
From Factory
Copper Reducer To
ServeAs Funnel
Drain (By Others)
7/8" O.D. Copper Pipe
Or 7/8" I.D. Hose
(Not Supplied)
Figure #13
Sloping The Steam Line
NOTE: Steam hose should not reach bottom of the funnel.
Min. 10 Degree Slope
2.
The drain line should not end in a sink used
frequently by personnel, or where plumbing
Min. 12"
Trap
Figure #11
Drain Pump (if necessary)
* See Section On
Condensate
Return Line
Humidifier
NOTE: Trap must be 3' minimum down from steam distributor.
If not, condensate must be routed to drain.
Drain Line
Line
Floor
Surface
2.
142-9527
Pump
-4-
NORTEC steam supply hose or field-supplied
piping should be sloped downwards from the
steam distributors to the humidifier. Slope
hose. NORTEC is not responsible for health
effects or damage from substitute hose.
should be at least 2" in 12" to promote
condensate runback. See Figure #13. If this
slope is not possible, condensate must be
removed before the distributor. See Figure #14.
3.
Minimize the length of steam line and keep it as
straight as possible, minimizing bends. Also,
avoid using 90° elbows. Wherever possible, use
long radius turns (using tube bender on
oversized copper or pairs of 45° elbows). This
will reduce the condensate generated by heat
loss.
Figure #14
Long Steam Lines
6.
Steam lines require a minimum 7/8" O.D.
(nominal 3/4") copper pipe. Do not run steam
line more than 1 foot per lb/hr output. Example,
10 lbs/hr should not have a steam run longer
than 10 feet.
7.
Do not use steel or plastic pipe for steam
distribution, or hose other than NORTEC
supplied. Substitution will void warranty.
8.
If steam line is routed below steam distributor or
if the steam distributor is lower than the
humidifier, a condensate trap ‘tee’ will be
required to remove water at this low point. Run
condensate from trap to nearest drain lower than
the distributor. See Figure #16.
Figure #16
Condensate Tee At Any Low Point In Steam Line
Condensate To Drain
Not Acceptable
Without Trap "Tee"
4.
Duct
Ensure that the steam hose does not kink or
sag. The steam hose becomes more flexible
when hot. The hose should be supported to
prevent water traps. Only use steam hose for
connections or steam lined runs of 5 feet or less.
See Figure #15.
Obstruction
Humidifier
Condensate "tee"
At Low Point In
Steam Hose
Consult Factory
Figure #15
Steam Hose Routing
Avoid Kinks
Avoid Water Traps
To Floor Drain
9.
CONDENSATE RETURN LINE
1.
Proper
Slope
Gentle
Sweeping
Turns
5.
To ensure odor-free steam, always use
NORTEC steam hose. Check steam hose and
hose couplings periodically for cracks, breaks,
kinks. Replace as required. DO NOT substitute
-5-
Each steam distributor has a built-in condensate
return (3/8" O.D. copper tubing). Flexible
condensate return hose (3/8" I.D.) available from
NORTEC, is recommended for routing
condensate back into humidifier’s fill cup. Note:
A short length of 3/8" O.D. copper tubing is
supplied by NORTEC for use when routing
condensate hose back to humidifier’s fill cup.
Similarly, a short length of 3/8" I.D. condensate
hose with clamps is supplied with NORTEC’s
steam distributors to serve as a flexible coupling.
DO NOT direct solder field copper condensate
line to steam distributors.
2.
Always incorporate a trap in routing of
condensate return line. Condensate that
accumulates in trap will prevent possibility of
steam escaping. Depth of trap must exceed
duct static pressure2 inches of water column.
See Figure #17.
2.
Ensure that an adequate power supply is
available to carry full humidifier amperage drawn
as specified by the rated amps on the
humidifier’s nameplate label refer to local codes.
3.
A dedicated external disconnect must be
installed. Do not exceed the maximum circuit
protection amps indicated on the nameplate
label.
4.
Connect ground wire to cabinet ground clamp.
Do not use neutral wire of four wire supply as
ground.
5.
External wiring sizes must be in accordance with
NEC and/or CEC and existing local electrical
codes and by-laws.
Figure #17
Trap To Prevent Steam In Condensate Line
3' Min.
Figure #18
Primary Voltage Supply Wiring
Trap
Condensate Trap
NOTE: Depth of trap must be 2" more than
duct static pressure of water column.
3.
110-120 Vac
Hookup
Condensate return line cannot be run back to fill
cup if humidifier is within 12” of being level with
steam distributor. See Figure #13.
4.
If steam distributor is mounted level with or
below humidifier, condensate line must be
routed to nearest floor drain or to a condensate
pump (available from NORTEC). See Figure
#11.
5.
Provide a “U” trap in condensate line even when
distributor is located in return air plenum. It
stops a suction action from impeding
condensate flow when duct pressures are below
atmospheric.
6.
It is not necessary to return the condensate to
the humidifier.
7.
Condensate runs should be sloped well, runs
over 20 feet should use 1/2" I.D. copper tubing
to ensure flow.
GND
220-240 Vac
Hookup
L1 N
GND
G
L1 N
L2
G
LOW VOLTAGE CONTROL WIRING
On-Off Controls
Figure #19
External Wiring Of On/Off Controls
A
B
C
ELECTRICAL
External
Internal
PRIMARY VOLTAGE SUPPLY WIRING TO
HUMIDIFIER
1.
1
2
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.
Check and ensure that available voltage and
phase corresponds with operating voltage and
phase of humidifier as indicated on the
humidifier nameplate label (see Figure #1).
-6-
A, B and C (described below) are to be wired in
series (only one path for current) across terminals 1
and 2 on the low voltage control terminal. Caution:
this is the “hot” wire from the 24V control transformer;
it will blow the 2A 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.
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.
OPERATION
INTRODUCTION
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.
2.
3.
4.
The NORTEC NHU 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.
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.
NHU OPERATION
END OF CYLINDER LIFE
Field wiring from the humidistat to the humidifier
and between devices should be class 1 wiring
rated 300 Vac minimum, 18 AWG or heavier and
kept as short as possible
When the cylinder is used up and water level can
no longer stabilize below full cylinder (due to fully
coated electrodes), the red light will come on. The
disposable cylinder must be replaced.
Low voltage control terminal strips are provided
in the electrical compartment. Internal sides are
factory wired. External sides are to be field
wired.
Although “red light on” is the same signal at
startup as it is at end of cylinder life, the age of the
cylinder enables the user to know when “red light 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 Maintenance & Troubleshooting section
of this Manual.)
Each humidifier is supplied with a wiring diagram
inside.
CONTROL INSTALLATION
1.
2.
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 an outside
wall where temperature fluctuation can affect
control response.
MANUAL CAPACITY ADJUSTMENT
The NHU humidifier is rated in lbs/hr of steam
output capacity. Set to 100%, it will operate at full
output until the humidistat has sensed that the
humidity has reached setpoint. Then it will stop the
humidifier by breaking control circuit 1-2.
If the humidifier is oversized, the humidistat will be
quickly satisfied and stop the humidifier. As humidity
level drops the humidistat calls again. It is quickly
satisfied and stops again. The resultant short-cycling
is easily overcome. A manual capacity adjustment
potentiometer is provided on the NHU main PC board
for that purpose. It is marked “CAPACITY
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.
-7-
ADJUSTMENT” and is adjustable from 20 to 100% of
rating.
2.
There will be reduced output in spite of a 100%
capacity setting and/or an unsatisfied call from
the on/off humidistat for more humidity.
3.
When the red status lamp is on, the water level
is detected as being at the top of the cylinder.
This is normal on startup, but as the contained
water concentrates, the water will stabilize at a
lower water level and the red lamp will be off.
4.
When the cylinder is fully used, the water level
will have returned to the top of the cylinder.
Since there is no longer any clean electrode
surface available at end-of-cylinder-life, the
required steam output rate can no longer be
maintained.
OTHER POTENTIOMETERS
Do not adjust any other potentiometers on the PC
board(s). Doing so will affect the units operation and
will void warranty.
MAINTENANCE
WARNING! The plumbing and electrical
compartments contain high voltage components and
wiring. The access door is equipped with a lock.
Access should be limited to authorized personnel only.
WHEN TO REPLACE THE STEAM
CYLINDER
HOW TO REMOVE THE STEAM CYLINDER
It is advisable to keep a spare cylinder in stock
throughout the humidification season. When ordering
a replacement steam cylinder, always quote the three
or five digit model number on the label applied to the
cylinder or quote the unit’s serial number, model and
voltage located on the spec label (nameplate).
To remove the cylinder:
The steam cylinder is disposable and must be
replaced at end of cylinder life. Cylinder life is
dependent on water supply conditions and humidifier
usage. Failure to replace the cylinder at the end of
cylinder life may result in unit damage. NORTEC is
not responsible for any damages resulting from, or
attributable to, the failure to replace a used cylinder
(see Manufacturer’s Warranty). There are many
indications, each of which signifies the end of cylinder
life.
1.
Turn off water supply to unit.
2.
The used cylinder must be drained completely
before removal. If the water has just been
boiling, allow it to cool before draining. Push the
ON/OFF/DRAIN switch to the MANUAL DRAIN
position. Leave it in this position just long
enough to drain the cylinder (usually less than
10 minutes).
3.
When completely drained, push the main
ON/OFF/DRAIN switch back to the OFF
position.
4.
Once drained, turn off the main electrical
disconnect to the humidifier during the entire
cylinder change operation.
5.
Open front cover door.
6.
Cylinder plugs are attached to the primary
voltage cylinder wires. (The plugs remain
attached to the wires unless they have to be
replaced due to damage.) The plugs are
press-fitted over the electrode pins protruding
from the top of the cylinder. Remove cylinder
plugs from cylinder by pulling vertically.
7.
Using slot screwdriver, loosen the steam hose
clamp(s) and pull steam hose off the cylinder
vertically.
NHU
After a period of operation (not on initial startup),
the water level will approach the top of the
cylinder. (Life varies from 500 to 2000 operating
hours, as illustrated in Figure #20.)
Figure #20
Water Conditions vs. Cylinder Life
Capacity Adjustment Setting
100%
50%
25%
30
500
400
20
CaCO3 mg/L (ppm)
Grains of Hardness
1.
200
10
5
100
500
1000
2000
4000
Cylinder Life Expectancy
(average operating hours)
8000
-8-
8.
Cylinder is now ready to be lifted out of the unit.
CAUTION: Cylinder and any undrained water
might still be HOT.
MANDATORY CLEANING OF THE DRAIN
VALVE
Always clean the drain valve before installing a
new cylinder since the valve port may be as dirty as
the used cylinder.
10.
Clean out the end of the hose, then reconnect it
to the drain valve body with the clamp.
11.
Fit mounting screws through drain valve body,
one through ring terminal on green ground wire.
12.
WARNING: To prevent the possibility of
electrical shock the green ground wire must be
reinstalled before power is restored.
13.
Push the two slip-on terminals back onto the two
tabs on the coil. The terminals, although not
identical, are reversible.
Figure #21
Reassembly Of The Drain Vale And Fill Valve
HOW TO INSTALL THE REPLACEMENT
CYLINDER
Actuator
Male Slip-on
Connection Tabs
Plunger
Spring
2.
3.
4.
Reverse procedure should be followed to install
a new cylinder. Main disconnect is to be left
open until cylinder is completely installed and
reconnected.
2.
The cylinder plug wires are color-coded in
accordance with colored dots beside the
electrode pins on top of the cylinder.
3.
This color-coding must be adhered to when
replacing cylinder plugs on pins.
4.
The white cylinder plug on all units is for the
sensor electrode which always goes on the
single pin surrounded by a plastic shoulder.
5.
Ensure that cylinder plugs fit snugly on the pins.
6.
If cylinder plugs become loose, it is best to
obtain a new replacement plug. Consult factory.
Sleeve
Holding Coil
1.
1.
Remove used cylinder as previously described.
NORTEC does not recommend the use of any
acid solutions to clean the used cylinder.
Always replace a used cylinder.
Note that ring terminal for drain valve green
ground wire is sandwiched between drain valve
body and drain pan.
Remove two screws securing drain valve body
to drain pan. Disconnect the two slip-on
terminals from the two tabs on the (24 Vac)
drain valve coil.
Figure #22
Cylinder Plug Installation Instruction
Remove hose clip and hose connection from
drain valve body.
Cylinder Plug Installation Instruction
Cylinder Plug Installation Instruction
For Part # 135-4012 (R, Y, or B)
for Part # 135-4012 (R,Y or B)
0.50"
5.
Drain valve assembly is now free to be taken to
a sink for disassembly and cleaning.
6.
Remove snap-fit red cap from coil assembly and
slide coil off the actuator.
10 ga
Wire
10
GA
Wire
0.50"
Cylinder plug
Cylinder Plug
Hex (Allen)
5/64" (2mm)
Hex (Allen)
5/64" (2 mm)
7.
8.
9.
Loosen actuator with wrench and unscrew from
plastic valve body.
12/08/94
Clean the exposed core and spring and plastic
drain valve port.
EXTENDED SHUTDOWN
Important: Tapered end of spring must be
installed toward the solenoid. Reassemble,
tighten actuator 1/4 turn past hand-tight.
Before disconnecting power to the humidifier for a
period of extended shutdown, ALWAYS DRAIN the
cylinder first. Otherwise, the electrodes are subject to
-9-
harmful corrosion which drastically shortens cylinder
life. Do NOT leave the switch in the DRAIN position
indefinitely as the drain coil could burn out. Leave the
switch in the OFF position and “open” the main
external fused disconnect to stop power to the
humidifier. Close the shut off valve in the water supply
line feeding the humidifier. Lock the cabinet door(s) to
prevent unauthorized tampering. All doors are factory
supplied with keyed locks. DO NOT LEAVE KEY IN
LOCK. ACCESS SHOULD BE LIMITED TO
AUTHORIZED PERSONNEL ONLY.
instances, is conductive and may lead to a false full
cylinder indication if the level of the foam approaches
the top of the cylinder.
BACK PRESSURE: Restriction of steam flow
caused by long steam runs, improperly sloped steam
lines, elbows changing the direction of the steam flow
from horizontal to vertical without a drain leg, any
plumbing detail allowing the accumulation of
condensate, undersized steam line, improper steam
distributor installation and downward air flow onto the
distributor creating excess static pressure at the steam
outlets or high static pressure ducts (not probable). To
overcome excess static pressure in the duct, a fill cup
extension kit should be used. In downflow
applications, a downflow distributor should be used but
in some cases the fill cup extension will also be
required in all other cases fix installation.
TROUBLESHOOTING
PLEASE READ THIS SECTION BEFORE
REFERENCING SPECIFIC DIAGNOSTIC
MESSAGES.
1.
Ensure the installation detail conforms with the
recommendations contained in the Installation
section of this manual.
2.
Understanding the Principle of Operation is an
asset when troubleshooting. This information is
readily available from your local representative.
3.
When contacting your local representative or
NORTEC, for troubleshooting assistance, please
ensure the serial number has been obtained for
reference purposes.
4.
Whenever the troubleshooting steps indicate a
problem with the main PCB, first check all
connections at the main control board.
MONITORED LEG: Refers to the primary wire, to
the cylinder, which loops through the current sensing
device on the main PCB. This wire is terminated at
the red cylinder plug at the cylinder.
STARTING POINT
If nothing is working, check for 24 Vac output from
the stepdown transformer (see wiring diagram). If
there is no 24 Vac output, the transformer might have
been damaged if external controls were installed
and/or connected with the field-supplied fused
disconnect on. If this is the case, the transformer fuse
must be checked.
The conductivity of the water within the cylinder
must be controlled in order for the humidifier to
function properly. The fill and drain rates must be
maintained. Filling too quickly can cause over-amping
and automatic shutdown or blown fuses. Filling too
slowly can cause insufficient steam output and
humidity levels. Water supply pressure should be
between 30 and 80 psig, ideally 55 to 60 psig. Draining
too slowly can cause over-concentration and
malfunction due to foaming. These are just some
examples of what can go wrong if the fill and drain
rates are not maintained.
TERMS USED
RATED AMPS: Refers to amps listed on the
humidifier specification label.
SHORT CYCLING: When the ‘on time’ of the
humidifier is less than ten minutes upon a call for
humidity. To correct short cycling, all humidifiers have
a capacity adjustment which allows the output of the
humidifier to be reduced to as low as 20% of rated
output, thus extending the ‘on time’ required to
maintain output.
To verify the fill rate of suspect units - Open the
disconnect to cut off all power in the humidifier before
reaching inside. One of the 24 Vac wires to each
primary voltage contactor holding coil should be
temporarily disconnected for this test. This way, no
boiling occurs during the test so as not to detract from
the fill rate. Turn power pack on to ensure call for
humidity to ensure fill valve activation. Fill rates should
measure nominally at 1" to 1-1/2" of vertical rise in
water level in the cylinder in one minute.
FOAMING: The phenomenon which can occur in
water when the impurities, already in the water, reach
an excess concentration as a result of froth forming on
the water. The humidifier electronics are designed to
prevent this occurrence although in extreme cases
water will foam with little concentration, making it
necessary to have the drain time of the water,
contained in the cylinder, increased. Foaming is
normally caused by short cycling, a restricted drain, or
back pressure. The foam, generated in these
- 10 -
Manual drain rates of suspect units should be
checked using Figure #23 as reference times.
Figure #23
Manual Drain Times
CYL. SIZE PROPER TIME (sec) TO DRAIN MANU(SERIES) ALLY FROM SEAM TO EMPTY
BEIGE BODY DRAIN VALVE
200
25 seconds ±1 second
If time measurements are longer, repeat with
external drain disconnected (and draining into a pail)
to know if external drain is impeding flow.
Drain can also be restricted by a clogged strainer
and/or clogged drain valve which would result in
shortened cylinder life. Clean and determine what
caused the strainer and/or drain valve to clog in the
first place.
Do not assume that if strainer and/or drain valve
are clogged that they are to blame. If the external
drain has been impeding flow then waste accumulates
resulting in a clogged strainer and/or clogged drain
which, in turn, results in shortened cylinder life.
Clean the drain valve and install a fresh cylinder.
Then measure the manual drain time with and without
the external drain connected. Is the external drain
impeding flow? NORTEC recommends an open
external drain line. See Installation section of this
manual.
- 11 -
110-120 Vac
Hookup
GND
L1 N L2
G
G
220-240 Vac
Hookup
L1 N
GND
L2
G
L1 N L2
ON/OFF
CONTROLS
EXTERNAL
EXTERNAL
INTERNAL
INTERNAL
STEP DOWN
TRANSFORMER
2 Amp
1
2
ON
OFF
3
ON/OFF/DRAIN
SWITCH
POWER ON
LAMP
DRAIN
NHU HUMIDIFIER
WIRING DIAGRAM No. NHU0001E
- 12 -
Rev. E October 23, 1998
Item Number
Part Number
Description
Quantity
1
151-9002
Cylinder Type 202
1
2
132-4047
Sensor Plug
1
3
135-4012R
Spring Loaded Cylinder Plug - Red
1
4
135-4012B
Spring Loaded Cylinder Plug - Black
1
5
132-1216
Drain Canal
1
6
163-1026
Gasket For Round Drain Canal
1
7
132-5064
Support Screw For Drain Canal
1
8
132-0546
Washer For Round Drain Canal
1
9
132-6003
Drain Valve 3 Piece Assembly
1
10
132-6002
Drain Valve Coil Assembly
1
11
132-6004
Drain Valve O-Ring
1
12
132-6002K1
Drain Valve Plunger Assembly
1
13
131-3244
Fill Valve Assembly
1
14
145-5000
Fill Valve Gasket
1
15
149-5072
Brass Fitting And Washer
1
16
145-5004
Screws For Fill Valve
2
17
132-5023
Spring Clip For Fill Hose
2
18
132-8860
Fill Cup Drain Hose
Specify Length
Fill Cup Overflow Hose
Specify Length
19
132-5035
Spring Clip For Drain/Overflow Hose
20
132-8850
Fill Cup Fill Hose
Specify Length
21
142-1050
Fill Cup (Wedge)
1
22
147-4993
High Water Sensor Board
1
23
158-3001
Contactor Relay
1
24
163-1050
Three Pole Terminal Block
1
25
158-3002
Two Pole Low Voltage Terminal Strip
1
26
132-3020
Ground Connector
1
27
170-3120
Transformer 120/24 Vac
1
28
158-1340
NHU Control Board
1
29
158-3005
Green Unit On Lamp c/w Lens (24 Vac)
1
30
132-3099
Red High Water Lamp c/w Lens (14 Vdc)
1
31
132-3097
On/Off/Drain Switch
1
32
185-3101
Key Lock Assembly
1
32A
185-3102
Key For Lock Assembly
1
33
158-7101
NHU Cabinet
1
34
158-7102
NHU Door
1
35
158-7103
High Voltage Compartment Cover
1
36
158-3010
P.C. Board Nylon Standoffs
1
Not Shown
132-8810
Steam Hose
- 13 -
4
Specify Length
22
33
23
25
26
24
27
28
35
32
21
29
36
30
32A
18
31
16
13
14
20
36
2
17
3
4
15
1
6
5
34
8
7
11
19
10
9
- 14 -
12
LIMITED WARRANTY
NORTEC INDUSTRIES INCORPORATED and/or NORTEC AIR CONDITIONING
INDUSTRIES LIMITED (hereinafter collectively referred to as THE COMPANY), warrant
for a period of two years from date of shipment, that THE COMPANY’s manufactured
and assembled products, not otherwise expressly warranted (with the exception of the
cylinder) are free from defects in material and workmanship. No warranty is made
against corrosion, deterioration, or suitability of substituted materials used as a result of
compliance with government regulations.
THE COMPANY’s obligations and liabilities under this warranty are limited to
furnishing replacement parts to the customer, F.O.B. THE COMPANY’s factory,
providing the defective part(s) is returned freight prepaid by the customer. Parts used
for repairs are warranted for the balance of the term of the warranty on the original
humidifier or 90 days, whichever is longer.
The warranties set forth herein are in lieu of all other warranties expressed or
implied by law. No liability whatsoever shall be attached to THE COMPANY until said
products have been paid for in full and then said liability shall be limited to the original
purchase price for the product. Any further warranty must be in writing, signed by an
officer of THE COMPANY.
THE COMPANY’s limited warranty on accessories, not of NORTEC’s manufacture,
such as controls, humidistats, pumps, etc. is limited to the warranty of the original
equipment manufacturer from date of original shipment of humidifier.
THE COMPANY makes no warranty and assumes no liability unless the equipment
is installed in strict accordance with a copy of the catalog and installation manual in
effect at the date of purchase and by a contractor approved by THE COMPANY to
install such equipment.
THE COMPANY makes no warranty and assumes no liability whatsoever for
consequential damage or damage resulting directly from misapplication, incorrect sizing
or lack of proper maintenance of the equipment.
THE COMPANY retains the right to change the design, specification and
performance criteria of its products without notice or obligation.
“CONDAIR” is a registered trademark of Axair Ltd., Pfäffikon, Switzerland.
NORTEC, Ogdensburg, NY, USA and Ottawa, ON, Canada are registered users of the
Axair trademark, all rights reserved.
Model #:
Serial #:
Cylinder #:
Cylinder Last Replaced:
NORTEC INDUSTRIES INC.
P.O. Box 698
826 Proctor Avenue
Ogdensburg, NY 13669
NORTEC AIR CONDITIONING
INDUSTRIES LTD.
2740 Fenton Road*
Ottawa, ON K1T 3T7
Tel: (315) 425-1255
e-mail: [email protected]
Tel: (613) 822-0335
Fax: (613) 822-7964
A WMH COMPANY
PRINTED IN CANADA
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