Groen NEB/1 User manual

OPERATOR MANUAL
IMPORTANT INFORMATION, KEEP FOR OPERATOR
THIS MANUAL MUST BE RETAINED FOR FUTURE REFERENCE. READ,
UNDERSTAND AND FOLLOW THE INSTRUCTIONS AND WARNINGS
CONTAINED IN THIS MANUAL.
FOR YOUR SAFETY Instructions to be followed in the event user smells
gas. This information shall be obtained by consulting your local gas
supplier. As a minimum, turn off the gas and call your gas company and
your authorized service agent. Evacuate all personnel from the area.
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 damage. Unified
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 file
a claim with the carrier. We recommend that you do so at once.
Manufacture Service/Questions 888-994-7636.
PART NUMBER 148669, REV. G (01/22)
This manual provides information for:
STEAM BOILER
MODELS NEB/1
EQUIPMENT DESCRIPTION
The Groen NEB/1 steam boiler generates low pressure steam for use with HyPlus
cabinet-mounted steamers and steam jacketed kettles. The NEB-1 Boiler may
be used for a variety of applications in a variety of combinations.
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.
REFERENCES
NFPA/70 The National Electrical Code
NATIONAL FIRE PROTECTION ASSOCIATION
60 Battery March Park
Quincy, Massachusetts 02269
NSF INTERNATIONAL
798 N. Dixboro Rd.
P.O. Box 130140
Ann Arbor, Michigan 48113-0140
888-994-7636, fax [phone]
unifiedbrands.net
UNDERWRITERS LABORATORIES, INC.
333 Pfingsten Road
Northbrook, Illinois 60062
NOTE: A RETROFIT KIT IS AVAILABLE FROM
THE FACTORY FOR THOSE AREAS IN WHICH
COMPLIANCE WITH CSD-1 STANDARDS IS
REQUIRED.
The information in this document is Confidential and shall not be disclosed to any third party without the express written
consent of Unified Brands. 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. © 2022 Unified Brands. All Rights Reserved.

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.
INSPECTION & UNPACKING
CAUTION: SHIPPING STRAPS ARE UNDER TENSION AND CAN SNAP BACK WHEN CUT.
TAKE CARE TO AVOID PERSONAL INJURY OR DAMAGE TO THE UNIT BY
STAPLES LEFT IN THE WALLS OF THE CARTON.
CAUTION: OR 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.
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 at the end of this manual.
When installation is to start, cut the straps and lift the unit straight up off the skid.
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 QUALITY REQUIREMENTS
Containment Water Supply
pH 7 to 9
Total Dissolved Solids (TDS) 30 to 60 ppm
Hardness less than 60 ppm
Chlorine and Chloramine less than .1 ppm
Chlorides less than 30 ppm
Silica less than 12 ppm
Undissolved Solids less than 5 microns
In order to accurately choose the correct water treatment solution, a water quality
test has to be performed. If a “Free Start-up” is requested, the ASA will perform a
water quality test and Unified Brands (UB) will be able to suggest the best solution
for your water quality. If it isn’t, your local manufacturing representative can
coordinate this for you.
After the “Free Start-up” is performed, UB will add an additional 1-year parts and
labor warranty. If UB suggests a water treatment system, the system is purchased
from UB, installed and maintained, water related service issues will be covered for
the duration of the warranty period.
INSTALLATION
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.
CAUTION: MAKING ANY ELECTRICAL OR MECHANICAL CHANGE IN THE UNIT WITHOUT
PRIOR GROEN APPROVAL WILL VOID ALL WARRANTIES.
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.
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.
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).
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.

3 OM-NEB/1
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.
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
WATER 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.
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.
SAFETY VALVE
Ensure that the safety valve 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.
INITIAL START-UP
WARNING: ANY POTENTIAL USER OF THE EQUIPMENT SHOULD BE TRAINED IN SAFE
AND CORRECT OPERATING PROCEDURES.
After the unit has been installed, test it to ensure that it is operating properly.
Operating Controls are located on the front of the cabinet base unit.
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.

4 OM-NEB/1
OPERATION
WARNING: BE SURE ALL OPERATORS READ, UNDERSTAND AND FOLLOW THE
OPERATING INSTRUCTIONS, CAUTIONS AND SAFETY INSTRUCTIONS
CONTAINED IN THIS MANUAL.
The operator controls the cooker/mixer with the:
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.
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.
d. 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).
e. 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.
SQUENCE OF OPERATION
CAUTION: WAIT AT LEAST 60 SECONDS BEFORE ATTEMPTING TO RE-LIGHT THE MAIN
BURNER AFTER IT SHUTS OFF.
CAUTION: ESCAPING STEAM MAY CAUSE SEVER BURNS. STAY AWAY FROM
THERMOSTATIC AIR VENT AND PRESSURE RELIEF VALVES.
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.
CLEANING
WARNING: WATER AND VALVES MAY BE VERY HOT, AND MAY CAUSE BURNS. PROTECT
HANDS FROM HOT SURFACES AND WATER.
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.
WARNING: SOLUTION AND VALVES WILL BE VERY HOT, AND MAY CAUSE BURNS.
PROTECT HANDS FROM HOT SURFACES AND CONTINUE TO USE
PROTECTIVE GLOVES.
The manual drain valve is located under the boiler. 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.
SUGGESTED CLEANING SUPPLIES
1. 1/2” hardened square wrench extension
2. Pipe Joint compound
3. 32 oz. Groen Delimer Descaler (PN 114800), or equivalent
4. Groen Spray Degreaser (PN 114801), or equivalent
5. Nylon pad(s)
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.

5 OM-NEB/1
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.
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.
MAINTENANCE
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.
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.
PERIODIC MAINTENANCE
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).
When pressure reaches five PSI on the gauge, lift the lever to vent steam, then
release it, allowing it to snap back into place.
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.
REPLACEMENT PARTS
To order parts, contact your Authorized Service Agent. Supply the model
designation, serial number, part description, part number, quantity, and when
applicable, voltage and phase.
CONTACT US
If you have questions pertaining to the content in this manual, contact Unified
Brands at 888-994-7636.
TROUBLESHOOTING
Do not operate the unit if it malfunctions or has damaged or broken parts. Steam
boilers are designed to operate smoothly and efficiently when maintained prop-
erly. 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 PROCEDURE PROCEDURE
Boiler does not fill
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/off switch in base cabinet turned
on? Is the amber light in the on/off 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 fill solenoid. (X)
g. Is the water fill solenoid valve defective? (X)
h. Is the solenoid drain valve open or leaking?
Check for loose electrical connections on
solenoid drain valve. (X)

6 OM-NEB/1
Boiler overfills 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 fill solenoid. (X)
d. Is the water fill 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 fills
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 fill 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 fill 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)
Boiler does not
build pressure with
heaters on.
User
a. Is the steam power take-off 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 off 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
sufficient 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 off.
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?
WARRANTY
Congratulations on the purchase of your new Unified Brands equipment. We hope you
enjoy many years of reliable service in connection with the same. Please review all of
the important safety and operational information contained in the Operator’s Manual
for this equipment before it is placed in service. If you have any questions related to
equipment set up, operations, or service, please call 888-994-7636.
In addition, please review the sales terms and conditions set forth below.
*****IMPORTANT NOTICE*****
WARRANTIES, LIMITATIONS ON WARRANTIES, AND LIMITATION OF REMEDIES
The following Warranties, Limitation on Warranties, and Limitation of Remedies are
included in the terms of sale for this product. Please read this entire warranty and all
warranty modifications, disclaimers, and limitations of remedies set forth herein before
accepting or using this equipment or product. Customer acknowledges and accepts
the provisions of this notice by Customer’s acceptance and use of the product. If these
provisions are not acceptable and agreed to by Customer, then please return this
product in its unused condition to Unified Brands or a Unified Brands authorized dealer.
UNIFIED BRANDS warrants this product against defects in material and workmanship
under normal use and services for which this product was designed. This warranty
runs only to the original end user and is in lieu of any other liability for defects.
THE WARRANTIES EXPRESSED IN THESE TERMS AND CONDITIONS ARE IN PLACE
OF ANY AND ALL OTHER EXPRESS WARRANTIES (UNLESS SEPARATELY STATED IN
PRINTED MATERIAL PREPARED BY US DESCRIBING OUR EQUIPMENT) AND EXCLUDE
ALL IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE; NOR ARE THERE
ANY OTHER WARRANTIES, EXPRESS OR IMPLIED, BY OPERATION OF LAW OR
OTHERWISE. In no event shall UNIFIED BRANDS be liable for damages or delay or
for any consequential, special or contingent damages arising out of any breach of
our warranty, whether or not we have knowledge of specific needs or our employees
or agents have given any specific assurances. Anyone claiming that there has been
a breach of warranty by UNIFIED BRANDS must give us written notice within THIRTY
(30) days after discovery of the relevant defect or the right to assert such claim will
have been waived conclusively and provided further that any such claim must also be
asserted within the general warranty period for such equipment and/or parts.
UNIFIED BRANDS will not be liable for any expense incurred without our prior written
authorization for alterations made outside of our factory or for repairs which are
not performed by UNIFIED BRANDS authorized service departments using UNIFIED
BRANDS factory parts. Nor shall we be responsible for the performance of equipment
as to which any repairs, revisions or alterations have been made by others.
THE EXCLUSIVE REMEDY OF THE USER OR BUYER AND THE EXCLUSIVE LIABILITY OF
UNIFIED BRANDS OR ANY SELLER OF UNIFIED BRANDS PRODUCTS, FOR ANY AND ALL
CLAIMS, LOSSES, INJURIES, OR DAMAGES (INCLUDING CLAIMS BASED ON BREACH
OF WARRANTY, CONTRACT, NEGLIGENCE, TORT, STRICT LIABILITY, OR OTHERWISE)
RESULTING FROM OR ARISING OUT OF THE USE OF HANDLING OF THIS PRODUCT,
SHALL BE THE RETURN OF THE PURCHASE PRICE OR AN AMOUNT NOT TO EXCEED
THE ORIGINAL PURCHASE PRICE OF THE PRODUCT OR, AT THE ELECTION OF UNIFIED
BRANDS OR THE SELLER, THE REPLACEMENT OF THE PRODUCT.
https://unifiedbrands.net/
Groen-Warranty-Information

7 OM-NEB/1
Parts List
0
7
1
3
6 8
2 4
0
7
1
3
6 8
2 4
161514
910
19
24
23
18
17
8
7
654
1212
213 21 22
11
13

8 OM-NEB/1
Parts List
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 EXTENSION 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 ELECTRIC 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 HARNESS, SINGLE PHASE 174988
- LABEL, FIELD WIRING, SINGLE PHASE 175011

9 OM-NEB/1
Wiring Diagram
CALL FACTORY FOR
REPLACEMENT PARTS:
888-994-7636

10 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