Groen NEB/1 User manual

This manual provides information for:
OPERATOR MANUAL
IMPORTANT INFORMATION, KEEP FOR OPERATOR
PART NUMBER 148669 REV E (08/16)
MODEL NEB/1
STEAM BOILERS
· Electrically Heated
· 24, 36 or 48 Kilowatts
1055 Mendell Davis Drive
Jackson, MS 39272
888-994-7636, fax [phone]
unifiedbrands.net
Information contained in this document is known to be current and accurate at the time
of printing/creation. Unified Brands recommends referencing our product line websites,
unifiedbrands.net, for the most updated product information and specifications.
THIS MANUAL MUST BE RETAINED FOR FUTURE REFERENCE.
READ, UNDERSTAND AND FOLLOW THE INSTRUCTIONS AND
WARNINGS CONTAINED IN THIS MANUAL.
WARNING / FOR YOUR SAFETY
Do not store or use gasoline or other ammable vapors
and liquids in the vicinity of this or any other appliance.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, injury or
death. Read the installation, operating and maintenance
instructions thoroughly before installing or servicing this
equipment.
NOTIFY CARRIER OF DAMAGE AT ONCE
It is the responsibility of the consignee to inspect the container upon receipt of
same and to determine the possibility of any damage, including concealed dam-
age. Unied Brands suggests that if you are suspicious of damage to make a
notation on the delivery receipt. It will be the responsibility of the consignee to le
a claim with the carrier. We recommend that you do so at once.
Manufacture Service/Questions 888-994-7636.

2 OM-NEB/1
IMPORTANT - READ FIRST - IMPORTANT
CAUTION: SHIPPING STRAPS ARE UNDER TENSION AND CAN SNAP BACK WHEN CUT.
CAUTION: UNIT WEIGHS 620 LB (282 KG) FOR SAFE HANDLING, INSTALLER SHOULD OBTAIN HELP, OR EMPLOY
APPROPRIATE MATERIALS HANDLING EQUIPMENT (FORKLIFT, DOLLY, OR PALLET JACK) TO
REMOVE THE UNIT FROM THE SKID AND MOVE IT TO ITS PLACE OF INSTALLATION..
WARNING: THE UNIT MUST BE INSTALLED BY PERSONNEL WHO ARE QUALIFIED TO WORK WITH
ELECTRICITRY AND PLUMBING. IMPROPER INSTALLATION COULD RESULT IN INJURY TO
PERSONNEL AND/OR DAMAGE TO EQUIPMENT.
CAUTION: DRAIN MUST BE RATED FOR STEAM AND BOILING WATER. DO NOT USE PLASTIC PIPE.
WARNING: DO NOT CONNECT THE BOILER DRAIN DIRECTLY TO A BUILDING DRAIN.
WARNING: BLOCKING THE DRAIN MAY BE HAZARDOUS.
IMPORTANT: IMPROPER DRAIN CONNECTION WILL VOID WARRANTY.
WARNING: ALLOW COOKING CHAMBERS TO COOL BEFORE CLEANING.
WARNING: CAREFULLY READ THE WARNINGS AND FOLLOW THE DIRECTIONS ON THE LABEL OF EACH
CLEANING AGENT. USE SAFETY GLASSES AND RUBBER GLOVES AS RECOMMENDED BY DELIMING
AGENT MANUFACTURER.
WARNING: DO NOT MIX DE-LIMING AGENTS (ACID) AND DE-GREASERS (ALKALI) IN THE STEAM GENERATOR
OR ON THE COOKING CHAMBER WALLS.
NOTICE: DO NOT USE A CLEANING OR DE-LIMING AGENT THAT CONTAINS ANY SULFAMIC ACID OR
ANY CHLORIDE, INCLUDING HYDROCHLORIC ACID (HCL). IF THE CHLORIDE CONTENT OF ANY
PRODUCT IS UNCLEAR, CONSULT THE MANUFACTURER. DO NOT USE A DE-GREASER THAT
CONTAINS POTASSIUM HYDROXIDE OR SODIUM HYDROXIDE OR THAT IS HIGHLY ALKALINE.
WARNING: USE OF REPLACEMENT PARTS OTHER THAN THOSE SUPPLIED BY GROEN OR AUTHORIZED
DISTRIBUTORS VOIDS ALL WARRANTIES AND CAN CAUSE BODILY INJURY TO THE OPERATOR
AND DAMAGE THE EQUIPMENT. SERVICE PERFORMED BY OTHER THAN FACTORY-AUTHORIZED
PERSONNEL WILL VOID ALL WARRANTIES.
WARNING: HIGH VOLTAGE EXISTS INSIDE CONTROL COMPARTMENTS. DISCONNECT FROM BRANCH BEFORE
SERVICING. FAILURE TO DO SO CAN RESULT IN SERIOUS INJURY OR DEATH.
WARNING: DO NOT EXPOSE SKIN TO ESCAPING STEAM. SEVERE BURNS CAN RESULT.

OM-NEB/1 3
Important Operator Warnings ...................................................... page 2
References..................................................................................... page 3
Equipment Description.................................................................. page 4
Inspection & Unpacking.................................................................. page 4
Water Quality & Treatment ........................................................... page 5
Installation .................................................................................. page 6-7
Initial Start-Up................................................................................ page 8
Operation ...................................................................................... page 9
Sequence of Operation ................................................................ page 10
Cleaning.................................................................................. page 11-12
Maintenance................................................................................. page 13
Troubleshooting...................................................................... page 14-15
Electrical Schematic ............................................................. page 18-19
Service Log ................................................................................. page 20
UNDERWRITERS LABORATORIES, INC.
333 Pngsten Road
Northbrook, Illinois 60062
NATIONAL FIRE PROTECTION ASSOCIATION
60 Battery March park
Quincy, Massachusetts 02269
NFPA/70 The National Electrical Code
NOTE: A RETROFIT KIT IS AVAILABLE FROM THE FACTORY FOR
THOSE AREAS IN WHICH COMPLIANCE WITH CSD-1 STANDARDS
IS REQUIRED.
Table of Contents
References

4 OM-NEB/1
The Groen NEB/1 steam boiler generates low pressure steam for use with HyPlus
cabinet-mounted steamers and steam jacketed kettles.
The boiler is housed in a stainless steel cabinet. Various combinations of steam
operated kettles and steamers can be mounted on the top. The boiler is small enough
to fit in a 24-1/8” (613 mm) wide by 34-3/16” (868 mm) deep by 29-3/16” (741 mm)
tall (maximum) cabinet.
The boiler is constructed of 1/4” thick steel, which is certified by the American Society
of Mechanical Engineers (ASME) for pressure vessels. All welds are hydrostatically
tested.
The boiler is also equipped with all required instruments, fittings, and controls.
Heating elements with low watt density ensure longer life for the unit. The boiler
is available for three phase 60 Hertz service in the following voltage and power
combinations: * A single phase configuration is available in the 24KW combinations.
208 Volts 240 Volts 480 Volts
24 Kilowatt 24 Kilowatt 24 Kilowatt
36 Kilowatt 36 Kilowatt 36 Kilowatt
48 Kilowatt 48 Kilowatt 48 Kilowatt
SEE OM-HY-6CAV FOR STEAMER CAVITY OPERATION AND/OR OM-TD FOR KETTLE
OPERATION.
Equipment Description
The NEB-1 Boiler may be used for a variety
of applications in a variety of combinations.
The unit will arrive completely assembled, wrapped in protective plastic and in a heavy-
duty carton on a skid. Immediately on receipt examine the carton and unit for shipping
damage. Report any damage or incorrect shipments to the delivery agent.
Write down the model number, serial number and installation date of your unit, and keep
this information for future reference. Space for these entries is provided at the top of the
Service Log on Page 20 of this manual.
When installation is to start, cut the
straps and lift the unit straight up off
the skid.
Inspection & Unpacking
CAUTION
SHIPPING STRAPS ARE UNDER TENSION
AND CAN SNAP BACK WHEN CUT.
CAUTION
UNIT WEIGHS 620 LB (282 KG) OR MORE.
FOR SAFE HANDLING OBTAIN HELP, OR USE
MATERIALS HANDLING EQUIPMENT (FORK
LIFT, DOLLY OR PALLET JACK) TO REMOVE
THE UNIT FROM THE SKID AND MOVE IT TO
ITS PLACE OF INSTALLATION.
Unit will arrive in a heavy carton,
mounted on a skid.
Beneath the heavy carton, the unit
will be wrapped in protective
plastic on a heavy skid.

OM-NEB/1 5
Water Quality & Treatment
It is essential to supply the steam generator with water that will not form scale or cause
corrosion. Even though the steam generator is engineered to minimize scale formation
and the effects of corrosion, their development depends on the quality of your water and
the number of hours per day you operate the equipment.
Most water supplies are full of minerals and chemicals which are not suitable for use in
a steam generator.
Water quality varies from state to state and city to city. It is necessary that you know
and understand the quality of the water you are using. Your water utility can tell you
about the minerals and chemicals in your water. The water going to the steam generator
should be within these guidelines
Water Pressure 30-60 psi
PH 7 to 9
Hardness less than 60 ppm
TDS 30 to 60 ppm
Chlorine and Chloramine less than 0.1 ppm
Total Chloride less than 30 ppm
Silica less than 12 ppm
Undissolved Solids less than 5 microns
1. Do not rely on unproven water treatments which are sold for scale prevention or
scale removal. They don’t always work. The best way to prevent scale is to supply
the purest possible water (30 - 60 ppm TDS).
2. If your water contains scale-forming minerals, as most water does, use a well-
maintained water softener. Whether an exchangeable softener cartridge or a
regenerating system is chosen, a regular exchange schedule is essential.
3. Installing a water meter between the softener and the steamer will provide an
accurate gauge of water use, and will help determine when to exchange cartridges
or regenerate the softener. Using a water softener will provide longer generator life,
higher steam capacity, and reduce maintenance requirements.
4. If you notice a slowdown in steam production, have the unit checked for scale build-
up. Heavy scale reduces the unit’s ability to boil water and can even cause heating
elements in the steam generator to overheat and burn out.

6 OM-NEB/1
WHEN THE UNIT IS RECEIVED, IMMEDIATELY INSPECT IT FOR EXTERNAL OR INTERNAL
DAMAGE. REPORT ANY DAMAGE TO THE FREIGHT CARRIER.
NOTE: A RETROFIT KIT IS AVAILABLE FROM THE FACTORY FOR THOSE LOCALITIES IN
WHICH COMPLIANCE WITH CSD-1 STANDARDS IS REQUIRED.
After inspection, keep the unit in its shipping container until it is installed. It can be
installed on combustible and non-combustible floors. Minimum clearances are:
Right Side — Two inches*
Left Side — Four inches
Rear — Six inches
*In order to service the unit properly, access with at least 24 inches clearance is
needed on the right side.
Level the unit front to rear and left to right by adjusting its legs. Levelness may be
checked by using a spirit level on top of the cabinet.
1. Electrical Supply Connection
Provide the proper voltage (60 Hz, Three Phase) as specified on the electrical
information plate attached to the unit. The current draw and minimum
recommended wire size and insulation temperature ratings are shown in the
table below. Use only copper wire. Local codes and/or the National Electrical Code
should be followed (ANSI/NFPA-70- 1987 - or latest edition).
AN ELECTRICAL GROUND IS REQUIRED. The ground terminal is located next to
the supply terminal block in the electrical enclosure. The main supply knockout
hole is sized for a 1½” conduit fitting. The auxiliary supply knockout is sized for a
¾” conduit fitting. Copies of the electrical schematic are located in the electrical
enclosure on the equipment and in this manual. In Canada, electrical service must
comply with the Canadian Electrical Code, CSA C22.1, Part 1, and/or local codes.
WARNING
THE UNIT MUST BE INSTALLED BY
PERSONNEL WHO ARE QUALIFIED TO
WORK WITH ELECTRICITY AND PLUMBING.
IMPROPER INSTALLATION CAN CAUSE
INJURY TO PERSONNEL AND/OR
DAMAGE TO THE EQUIPMENT.
Installation
CAUTION
MAKING ANY ELECTRICAL OR
MECHANICAL CHANGE IN THE UNIT
WITHOUT PRIOR GROEN APPROVAL WILL
VOID ALL WARRANTIES.
Voltage
Power
Rating
(Kilowatt)
Current Draw
(Ampere)
Supply Wire Ground Wire
Rating
AWG mm AWG mm
208 24 67/116 4/1 6.5 5.3/7.6 3.3 90°C
208 36 100 2/0 9.3 6 4.1 90°C
208 48 100 (Main)
34 (Auxiliary)
2/0
6
9.3
4.1
6
10
4.1
2.6
90°C
90°C
240 24 58/100 6/2 5.8 4.1/7.1 3.3 90°C
240 36 87 1 7.3 8 3.3 90°C
240 48 87 (Main)
29 (Auxiliary)
1
8
7.3
3.3
6
10
4.1
2.6
90°C
90°C
480 24 29/50 10/6
10/8
5.8
3.3
2.5/4.1
2.5/3.2
2.6
2.6
75°C
90°C
480 36 44 1/0
6
8.3
4.1
10
10
2.6
2.6
75°C
90°C
480 48 58 2/0
3
9.3
5.8
8
8
3.3
3.3
75°C
90°C

OM-NEB/1 7
Installation
CAUTION
DO NOT LOCATE THE BOILER CABINET
DIRECTLY OVER A FLOOR DRAIN OR FLOOR
SINK. HUMIDITY OR WATER FROM WILL
DAMAGE ELECTRICAL.
IMPORTANT
IMPROPER DRAIN CONNECTION
WILL VOID WARRANTY.
2. Electrical Supply Connection
a. Cold water is supplied via a 1/2” NPT pipe connection at the rear of the unit.
A check valve (back siphonage device) must be installed in accord with local
plumbing codes.
b.
Water pressure should be between 30 and 60 PSI (215 and 420 kPa). If it is
over 60 PSI (420 kPa), a pressure regulator is required. A strainer screen at the
connection is also recommended, to trap any debris before it can enter the system.
c. The NEB/1 boiler uses water at the maximum rate per hour shown below.
MAXIMUM WATER CONSUMPTION
Unit Gallons/Hour Liters/Hour
NEB/1 (24 KW) 8.2 31
NEB/1 (36 KW) 12.5 47.3
NEB/1 (48 KW) 16.9 64
Piping should be sized to handle total water consumption.
3. Drain Connection
a. A drain connection is made at t he rear of the unit with 1-1/4” NPT pipe. DO
NOT USE PLASTIC PIPE. DRAIN PIPING MUST WITHSTAND STEAM AND BOILING
WATER. Extend the drain piping to a nearby floor drain. Piping of 1-1/4” NPT (or
1-1/2” NPT) is acceptable for distances of six feet (2 m) or less. If the distance
to the drain is further than six feet (2 m), use 2” NPT piping.
b. The drain line must have a constant downward pitch. Do not permit water
traps in the line. DO NOT CONNECT THE LINE DIRECTLY TO ANY BUILDING
DRAIN. There must be vertical air gap of at least two inches (5 cm) between
the drain line and the building drain unless otherwise specified by local
plumbing codes.
4. Safety Valve
Ensure that the safety valve (see picture, Page 13) is vented properly. The
following Installation Instruction WARNING is quoted from the safety valve
manufacturer:
“During operation this valve may discharge large amounts of steam and/or hot
water. Therefore, to reduce the potential for bodily injury and property damage, a
discharge line MUST be installed that:
a. is connected from the valve outlet to a safe point of discharge with no
intervening valve.
b. allows complete drainage of both the valve and the discharge line.
c. is independently supported and securely anchored so as to avoid applied
stress on the valve.
d. is as short and straight as possible.
e. terminates freely to atmosphere where any discharge will be clearly visible
and is at no risk of freezing.
f. terminates with a plain end which is not threaded.
g. is constructed of a material suitable for exposure to temperatures of 375°F or greater
h. is, over its entire length, of a pipe size equal to or greater than the valve outlet.”

8 OM-NEB/1
Initial Start-Up
After the unit has been installed, test it to ensure that it is operating properly.
1. Remove literature and packing material from the interior and exterior of the unit.
2. Make certain the water supply is turned on.
3. Turn on electrical power to the unit.
4. Turn the on/off switch on the cabinet front panel to the “ON” position:
• The boiler drain valve will close and the unit will fill with water.
• When the water level reaches the “mid” probe, the red RESET light will come
on.
• Push the START switch.
• The green light in the switch will come on and the RESET light will go out.
The heater element contactors will close.
• When the water level reaches the “hi” probe, the water supply to the boiler
will shut off.
5. After about 15 minutes, the gauge pressure will rise. When the pressure reaches
12 PSI (83 kPa), the main burner will turn off. Thereafter, as pressure decreases,
the contactors will close to maintain the 12 PSI (83 kPa) level.
6. To shut the unit down, turn the ON/OFF switch to OFF. When it has cooled to
approximately 130°F, the unit will automatically drain.
If the unit functions as described above, it is ready for use. If it does not, contact your
authorized Groen Service Agent.
Operating Controls are located on the
front of the cabinet base unit.
WARNING
ANY POTENTIAL USER OF THE EQUIPMENT
SHOULD BE TRAINED IN SAFE AND CORRECT
OPERATING PROCEDURES.

OM-NEB/1 9
Operation
1. Controls
Operating controls are located on the front panel of the unit.
a. The on/off switch starts the unit or shuts it off.
b. The RESET indicator lights to show that the boiler has filled with water and
that the main burners can ignite.
c. The start switch (momentary) lights the main burners. It also restarts the
unit if electrical power is interrupted, or if a low water condition in the boiler
disables the unit.
2. Operating Procedure
a. Turn on the water supply to the unit.
b. Turn on electrical power to the unit.
c. Turn the on/off switch on the front of the cabinet to “ON.”
1) The boiler drain valve will close and the unit will fill with water.
2) When the water reaches the “mid” probe, the red RESET light will come
on.
3) Press the start switch.
4) The green light in the switch will come on, the RESET light will go off,
and the heater element contactors will close.
5) When the water level reaches the “hi” probe, the water supply to the
boiler will shut off.
e. After about 15 minutes, the pressure gauge will indicate that the pressure
is rising. When it reaches 12 PSI (83 kPa), the heater contactors will
open. Thereafter, the contactors will close as the pressure decreases to
maintain the pressure at 12 PSI (83 kPa).
f. To shut down the unit, turn the ON/OFF switch to “OFF.” The unit will drain
automatically after it has cooled to about 130°F.
See OM-HY-6CAV for steamer cavity operation and/or OM-TD for kettle operation
information.
WARNING
BE SURE ALL OPERATORS READ,
UNDERSTAND AND FOLLOW THE OPERATING
INSTRUCTIONS, CAUTIONS AND SAFETY
INSTRUCTIONS CONTAINED IN THIS
MANUAL.

10 OM-NEB/1
Sequence of Operation
CAUTION
WAIT AT LEAST 60 SECONDS BEFORE
ATTEMPTING TO RE-LIGHT THE MAIN
BURNER AFTER IT SHUTS OFF.
When electrical power is turned on to the unit, the following happens:
• The drain valve closes
• The water valve opens
• The unit fills with water
As the boiler fills, the water is detected by two probes. The first of these is the “mid”
probe, which activates the RESET light. The second (“hi” probe) is reached when the
boiler is full, and shuts off the water supply. As the water supply drops below this
probe, the water supply opens until it is again reached.
A thermostatically-controlled air vent remains open while the boiler fills. As steam
develops, this vent will close. Some steam may escape from the vent before it is fully
closed (at approximately 200°F) (93°C).
Once the pressure has reached 12 PSI (kPa), the operating pressure switch will open
the heater element contactors. As pressure decreases, the heater element contactors
close to maintain the pressure at 12 PSI (83kPa).
If something causes the pressure to pass 14½PSI, (100 kPa), a high-limit safety switch
will electrically shut down the boiler. If this happens, the unit should not be re-started
until the problem which caused the shut-down has been corrected.
As an additional safety measure, the unit is equipped with an A.S.M.E.-certified safety
valve which will open to relieve excess pressure at 15 PSI. The ability of this valve to
discharge steam pressure is greater than the boiler’s ability to generate steam.
When the “ON/OFF” switch is turned “OFF,” a thermostatic switch mounted on
the boiler shell will keep the drain valve closed until the temperature drops to
approximately 130°F (77°C). Then the switch opens, and water drains from the boiler.
A vacuum breaker allows air to enter the boiler.
CAUTION
ESCAPING STEAM MAY CAUSE SEVER
BURNS. STAY AWAY FROM THERMOSTATIC
AIR VENT AND PRESSURE RELIEF VALVES.

OM-NEB/1 11
Cleaning
WARNING
WATER AND VALVES MAY BE VERY HOT,
AND MAY CAUSE BURNS. PROTECT HANDS
FROM HOT SURFACES AND WATER.
Whenever the boiler is turned off and allowed to cool to about 130ºF, it drains
automatically. This should be done every day to minimize scale buildup inside the
boiler.
In addition to this draining, however, the following cleaning procedure should be
followed using a regular schedule. This will prevent the accumulation of lime on the
water level probes and interior surfaces of the boiler. The actual time between these
scheduled cleanings depends on the water quality and hours of operation. Minimally,
Groen recommends cleaning the boiler at least once each month.
1. Suggested Tools
a. 1/2” hardened square wrench extension
b. Pipe Joint compound
c. 32 oz. Groen Delimer Descaler (PN 114800), or equivalent
d. Groen Spray Degreaser (PN 114801), or equivalent
e. Nylon pad(s)
2. Procedure
1. Turn the boiler on/off switch to the OFF position.
2. Slowly open the manual drain valve to empty the boiler. The valve is located
under the boiler.
3. Close the manual drain valve.
4. Turn off water supply to the boiler.
5. Allow the boiler to cool. This takes several hours, so it is recommended that
you cool the boiler overnight.
6. Turn on/off switch to “ON” to close the automatic drain valve.
7. Using a 1/2” hardened square wrench extension, remove one of the 1-1/4”
NPT pipe plugs from the front of the boiler.
8. Pour 32 ounces of de-limer into the boiler.
9. Replace the pipe plug. Use pipe joint compound, and tighten the plug
securely.
10. Turn on water supply to allow water to fill the boiler.
11. When the reset light appears, press the START switch.
12. Allow boiler pressure to develop. Let it stand for approximately 15 minutes
after pressure has built up. A badly limed unit may require more than 15
minutes.
If there are no steamer cavities or compartments with this boiler, proceed
to step 19.
The manual drain valve is
located under the boiler.
WARNING
USE SAFETY GLASSES AND RUBBER
GLOVES AS RECOMMENDED BY DE-LIMING
AGENT MANUFACTURER.
CAUTION
DO NOT USE A CLEANING OR DE-LIMING
AGENT THAT CONTAINS SULFAMIC ACID
OR ANY CHLORIDES, INCLUDING
HYDROCHLORIC ACID (HCL). IF THE
CHLORIDE CONTENT OF ANY PRODUCT IS
UNCLEAR, CONSULT THE MANUFACTURER.

12 OM-NEB/1
Cleaning
13. Turn on power to steamer cavities and set steamer timers for 10 minutes.
14. When steamer timers sound, turn them to OFF and open the doors.
15. When the fans have stopped, remove fan baffle partitions using protective
gloves, and rinse with clean water.
16. Completely wipe out steamer chambers using a degreaser and nylon pad, if
necessary. Rinse thoroughly with clean water.
17. Replace fan baffle partitions.
18. Wait 10 minutes for the compartments to air dry, then close the steamer
doors.
19. Turn the on/off switch OFF, and slowly open the manual drain valve.
20. When the boiler has drained completely, close the manual drain valve and
turn the on/off switch to “ON” to fill the boiler with water.
21. After the RESET light comes on, press the start switch.
22. Allow boiler pressure to develop.
If steamers are not present, proceed to step 25.
23. Set steamer timers for 10 minutes.
24. When steamer signal sounds, turn timers off.
25. If the boiler is not to be used, it may be turned off. It is ready for normal
operation.
WARNING
SOLUTION AND VALVES WILL BE VERY HOT,
AND MAY CAUSE BURNS. PROTECT HANDS
FROM HOT SURFACES AND CONTINUE TO
USE PROTECTIVE GLOVES.

OM-NEB/1 13
Maintenance
Your boiler is designed to minimize maintenance, but certain parts may need to
be replaced after prolonged use. For the most part, no user adjustments should be
necessary. If a need for service arises, only Authorized Representatives should perform
the work.
Among the most common problems is the rapid build-up of scale in the boiler. To avoid
this, always supply water that has a low mineral content, which meets the standards
described in the Water Quality section of this manual.
1. Periodic Inspection
The unit should be inspected by a qualified service technician at least once each
year. The inspection should include electrical wires and connections, cleaning the
inside of the control enclosure and pilot burner adjustment, if required.
At the back of this manual (with the information about our warranty) is a
Maintenance and Service Log. Each time maintenance is performed on the unit,
enter the date on which it was done, what was done, and who did it. Keep this log
with the warranty.
In addition to yearly inspections by a qualified service technician, a weekly check
of the following will help prevent down time and ensure continued efficient
operation.
1. Pressure gauge operation
2. Proper water level (gauge)
3. Strainer in water feed line (clear?)
4. Drain piping (free running? No blockage?)
At least twice each month, check the safety valve to be sure it is working properly.
(Ensure that the safety valve is properly set up, as described in the Installation
Section of this manual (Page 7).
When pressure reaches five PSI on the gauge, lift the lever to vent steam, then
release it, allowing it to snap back into place.
2. Component Replacement
NEB/1 boilers are easy to service. The design is simple, and controls are readily
accessible.
Before replacing any part, COMPLETELY SHUT OFF ELECTRICAL POWER TO THE
UNIT.
WARNING
USE ONLY MANUFACTURER-SUPPLIED PARTS.
USING SUBSTITUTE, UNAUTHORIZED OR
“GENERIC” PARTS CAN CAUSE BODILY
INJURY TO THE OPERATOR AND DAMAGE
THE EQUIPMENT.
WARNING
DO NOT EXPOSE SKIN TO ESCAPING STEAM.
SEVERE BURNS MAY RESULT.
One of the pressure relief safety valves is
located on the top left rear of the boiler.

14 OM-NEB/1
Troubleshooting
Do not operate the unit if it malfunctions or has damaged or broken parts. Steam boilers are designed to operate smoothly and ef-
ficiently when maintained properly. However, the following is a list of checks to make if there is a problem. Electrical schematics are
provided in this manual, and inside the unit electrical enclosure. IF THE ITEM ON THE LIST IS MARKED WITH (X), THE
WORK SHOULD ONLY BE DONE BY A FACTORY-AUTHORIZED SERVICE REPRESENTATIVE.
SYMPTOM WHO WHAT TO CHECK
Boiler does not ll with water. User a. Is water supply connected and is water present?
b. Is water pressure low (less than 30 PSI)?
c. Is strainer screen (if used) clogged?
d. Is on/o switch in base cabinet turned on? Is the amber light in
the on/o switch “ON”?
e. Is the manual drain valve open?
Authorized
Service Rep Only
f. Is the Water Level Control Board defective? Check for loose
electrical connections on water ll solenoid. (X)
g. Is the water ll solenoid valve defective? (X)
h. Is the solenoid drain valve open or leaking? Check for loose
electrical connections on solenoid drain valve. (X)
Boiler overlls with water. User a. Is the boiler level? Check levelness of unit with a spirit level.
b. Is the water pressure too high? (Greater than 60 PSI?)
Authorized
Service Rep Only
c. Is the Water Level Control Board defective? Check for loose
electrical connections on “hi” water ll solenoid. (X)
d. Is the water ll solenoid valve defective? (X) Check for debris on
valve seat.
e. Is the “hi” water probe sensing level? Clean water level probe
and probe well (located in boiler). (X)
Boiler under lls with water. User a. Is the boiler level? Check levelness of unit with a spirit level.
Water enters boiler slowly. User a. Is strainer screen (if used) clogged?
b. Is the water pressure too low? (Less than 30 PSI)?
c. Is the water supply line too small?
Authorized
Service Rep Only
d. Is the water ll solenoid defective? (X)
RESET light does not come
on.
Authorized
Service Rep Only
a. Is the Is the Water Level Control Board defective? Check for
loose electrical connections on “mid” water ll solenoid. (X)
b. Is the “mid” water probe sensing level? Clean water level probe
and probe well (located in boiler). (X)
c. Is the indicator light defective? (X)
Heater(s) will not come on. Authorized
Service Rep Only
a. Are contactors defective? (X)
b. Is the heater burned out? Check voltage and amperage on each
line at each heater. (X)
c. Is the contactor control relay defective? Note: Relay controls all
contactor coils. (X)

OM-NEB/1 15
Troubleshooting
Boiler does not build pressure
with heaters on.
User a. Is the steam power take-o valve open or leaking?
b. Is the pressure gauge defective?
Authorized
Service Rep Only
c. Is the air vent leaking steam? (X)
d. Is the solenoid or manual drain valve open or leaking? NOTE:
Excessive make-up water added to the boiler reduces steam
production. (X)
Heater(s) does (do) not shut
o after reaching operating
pressure.
Authorized
Service Rep Only
a. Is the pressure gauge defective? (X)
b. Is the operating pressure switch defective? No adjustment is
allowed. Replace the switch if defective. (X)
c. Are the contactors defective? (X)
d. Is the contactor control relay defective? (X)
Boiler builds pressure but
shuts down. RESET light
comes on.
User a. Is the water level below the “mid” water level probe? Verify that
the water supply is sucient to maintain the water level at or
above the “mid” water level probe.
Authorized
Service Rep Only
b. Is the operating pressure switch defective? No adjustment is
allowed. Replace the switch if defective. NOTE: If the high-
limit pressure switch has shut down the unit, it should not be
restarted until the problem which caused the shut-down has
been corrected. (X)
c. Is the “mid” water level probe unable to detect water? Clean the
water level probe and probe well (located in the boiler). (X)
Safety relief valve opens. Authorized
Service Rep Only
a. Are the operating pressure switch and/or high-limit pressure
switch defective? No adjustment is allowed. Replace defective
switches. (X)
b. Is the safety relief valve defective? Replace with ASME approved
15 PSI valve with “HV” marking. (X)
Boiler blows down
immediately when turned o.
Authorized
Service Rep Only
a. Is the thermostatic switch defective? Check for loose electrical
connections on switch. (X)
Boiler does not drain. User a. Is the thermostatic switch defective?
b. Is the solenoid drain valve defective?
c. Are the solenoid drain valve or hoses blocked?

16 OM-NEB/1
Parts List
CNEB/1

OM-NEB/1 17
Parts List
CNEB/1
KEY DESCRIPTION PART #
1 WATER LEVEL BOARD,
SINGLE
122192
2 WATER LEVEL BOARD,
DOUBLE
116016
3 TRANSFORMER 208/240V
PRIMARY/24V SECONDARY,
75VA
121716
4 CONTACTOR 148102
5 FUSEHOLDER 096809
6 FUSE 071489
7GROUND TERMINAL 119829
8 TERMINAL BLOCK 99295
9LIGHT AMBER 116384
10 LIGHT RED 116383
11 LAMP RESET 099289
12 PRESSURE RELIEF VALVE 099244
13 DRAIN VALVE 074594
14 SWITCH, RESET 099290
15 SWITCH, POWER 088876
16 PRESSURE GAUGE 078000
17 WATER LEVEL PROBE 014356
18 WATER LEVEL PROBE EX-
TENSION
041885
19 SIGHT GLASS 126031
20 THERMOSTAT 077985
21 RELAY, CUTOUT 119814
22 RELAY, DPDT 24VAC 121733
23 GASKET, ELEMENT 003494
24 ELEMENT 208V 12KW
ELEMENT 240V 12KW
ELEMENT 480V 12KW
148593
148594
148595
KEY DESCRIPTION PART #
- TOP PANEL 104341
- FRONT PANEL OVERLAY 121727
-BOILER ASSEMBLY 130443
- SIDE PANEL 143777
- FRONT PANEL 135981
- REAR PANEL 143743
- HARNESS, FRONT PANEL 130445
- HARNESS, MACHINE ELEC-
TRIC
130473
- HARNESS, CONTACTOR 24
KW
148567
- HARNESS, CONTACTOR 36
& 48 KW
148568
- HARNESS, ELEMENT SINGLE 148590
- HARNESS, ELEMENT
DOUBLE
148591
- HARNESS, 240V LINE 130483
- HARNESS, CONTACTOR BOX
CONTROL
148569
- HARNESS, CONTROL 148621
-HARNESS, WIRING DIAGRAM,
SINGLE PHASE
174986
- HARNESS, LOAD, SINGLE
PHASE
174987
- HARNESS, ELEMENT HAR-
NESS, SINGLE PHASE
174988
-LABEL, FIELD WIRING,
SINGLE PHASE
175011

18 OM-NEB/1
Electrical Schematic

OM-NEB/1 19
Electrical Schematic - Single Phase

20 OM-NEB/1
Service Log
Model No: Purchased From:
Serial No: Location:
Date Purchased: Date Installed:
Purchase Order No: For Service Call:
Date Maintenance Performed Performed By