OM—NEB
OPERATOR MANUAL
Model: NEB
Steam Generator
Electrically heated
24, 36, or 48 kilowatts
THIS MANUAL MUST BE RETAINED FOR FUTURE REFERENCE
FOR YOUR SAFETY
DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND
LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE.
LIMITED WARRANTY TO
COMMERCIAL PURCHASERS*
(Continental U.S., Hawaii & Canadian Sales Only)
Groen Foodservice Equipment ("Groen Equipment") has been skillfully manufactured, carefully inspected and
packaged to meet rigid standards of excellence. Groen warrants its Equipment to be free from defects in material
and workmanship for (12) twelve months with the following conditions and subject to the following limitations.
I.
This parts and labor warranty is limited to Groen Equipment sold to the original commercial
purchaser/users (but not original equipment manufacturers), at its original place of installation in
the continental United States, Hawaii and Canada.
II.
Damage during shipment is to be reported to the carrier, is not covered under this warranty, and
is the sole responsibility of purchaser/user.
III.
Groen, or an authorized service representative, will repair or replace, at Groen's sole election, any
Groen Equipment, including but not limited to, draw-off valves, safety valves, gas and electric
components, found to be defective during the warranty period. As to warranty service in the
territory described above, Groen will absorb labor and portal to portal transportation costs (time
& mileage) for the first twelve (12) months from date of installation or fifteen (15) months from
date of shipment from Groen.
IV.
This warranty does not cover boiler maintenance, calibration, periodic adjustments as specified in
operating instructions or manuals, and consumable parts such as scraper blades, gaskets,
packing, etc., or labor costs incurred for removal of adjacent equipment or objects to gain access
to Groen Equipment. This warranty does not cover defects caused by improper installation,
abuse, careless operation, or improper maintenance of equipment. This warranty does not cover
damage caused by poor water quality or improper boiler maintenance.
V.
THIS WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ALL OTHER WARRANTIES,
EXPRESSED OR IMPLIED, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY
OR FITNESS FOR A PARTICULAR PURPOSE, EACH OF WHICH IS HEREBY EXPRESSLY
DISCLAIMED. THE REMEDIES DESCRIBED ABOVE ARE EXCLUSIVE AND IN NO EVENT
SHALL GROEN BE LIABLE FOR SPECIAL, CONSEQUENTIAL OR INCIDENTAL DAMAGES
FOR THE BREACH OR DELAY IN PERFORMANCE OF THIS WARRANTY.
VI.
Groen Equipment is for commercial use only. If sold as a component of another (O.E.M.)
manufacturer's equipment, or if used as a consumer product, such Equipment is sold AS IS and
without any warranty.
* (Covers All Foodservice Equipment Ordered After October 1, 1995)
1
TABLE OF CONTENTS
EQUIPMENT DESCRIPTION 3
WATER CONDITIONING 3
INSTALLATION 4
INITIAL START-UP 5
OPERATION 5
SEQUENCE OF OPERATION 6
MAINTENANCE & CLEANING 6-7
TROUBLESHOOTING 8-9
PARTS LIST 10
DIAGRAMS & SCHEMATICS 11-12
REFERENCE 12
MAINTENANCE LOG 13
WARRANTY INFORMATION 14
2
Equipment Description
The Groen NEB steam generator is designed to generate low pressure steam for use in steamers
and steam jacketed kettles.
The unit is housed in a stainless steel cabinet, on top of which can be mounted various combina-
tions of steamers and kettles requiring a steam supply.
The NEB features a control box that is located at the front of the cabinet for easy maintenance.
The steam generating chamber is constructed of 1/4 inch boiler plate according to ASME code (all
welds are hydrostatically tested) and is equipped with all required instruments, fittings, and
controls.
Heating elements with low watt density ensure longer life for the unit. The generator is available
with the following voltage and power combinations, all for 3 PH, 60 HZ service.
480 V, 24
KW
480 V, 36
KW
480 V, 48 KW
240 V, 24 KW
240 V, 36 KW
240 V, 48 KW
208 V, 24 KW
208 V, 36 KW
Water Conditioning
It is absolutely essential that the water supplied to the Groen steam generator be of such a char-
acter that it will not form scale at an unacceptable rate. The Groen boiler was engineered to mini-
mize scale formation, but scale formation depends on the hardness of the water and the hours of
operation. In a few areas of the United States, the water supply is sufficiently free of minerals to
avoid scale formation. Most water supplies carry heavy loads of minerals, which will form scale on
the boiler and reduce its steam output. Your local water utility can provide a statement on the scale
forming qualities of the water supply. Water supplied to the boiler should contain not more than 30
parts per million total dissolved solids (TDS) and should have a pH of 7.0 or higher.
Please follow these simple precautions:
(1) Do not rely on "water treaters" commonly sold as scale preventers and scale removers.
THEY DO NOT WORK. The only proven way to prevent scale build-up is to feed in water
practically free of scale-forming minerals.
(2) If your water supply carries scale forming minerals, as most water supplies do, run the water
through a properly maintained softener. Exchangeable softener cartridges or a regenerat-
able softener can be used. In either case, establish a regular program of exchanging the
cartridges or regenerating the softener. Installing a water meter on the inlet line between the
softener and the boiler will give an accurate check of water consumption and a way of
determining when to change the cartridge or regenerate the softener. By using a softener
and operating within the softener's capacity to exchange minerals, the user will obtain a
longer generator life, high steam capacity, and minimum maintenance requirements.
(3) If you notice a slowing of steam production, examine the interior of the generator for scale,
and remove any scale deposits. (See the general cleaning instructions.) Hard scale can be
removed with acids like sulfamic or inhibited muriatic, but such treatment is dangerous and
should be done only by an expert familiar with the hazards. Vinegar will dissolve most
scales, but the process requires a long time and frequent changes of the vinegar solution.
3
Installation
WARNING: INSTALLATION OF THE GENERATOR MUST BE DONE BY
PERSONNEL QUALIFIED TO WORK WITH ELECTRICITY
AND PLUMBING. IMPROPER INSTALLATION CAN CAUSE
INJURY TO PERSONNEL AND/OR DAMAGE TO THE
EQUIPMENT.
(1) Level the unit by adjusting the legs and check for levelness by placing a spirit level on top of the
cabinet.
(2) Provide the proper electrical supply as specified on the electrical information plate attached to the
equipment. Local and national electrical codes and/or The National Electrical Code should be
observed in accordance with ANSI/NFPA 70 - latest edition. AN ELECTRICAL GROUND IS
REQUIRED. The electric schematic is located on the inside of the cabinet door. Any mechanical or
electrical change must be approved by the Groen Division Food Service Engineering Department.
(3) Adequate space for proper servicing and operation is required.
NOTE: Read the "Water Conditioning" section of this manual BEFORE you connect the water supply.
(4) COLD water must be supplied with 1/2" NPT connections to the pressure reducing valve located in the
left rear corner of the unit. Pressure of the water supply MUST be regulated at 20 to 30 PSI and
preferably will be maintained at 25 to 30 PSI.
(5) The unit has both an automatic drain and a manual drain. The drain hose should be connected with
1/2" NPT pipe to the manual drain on the left side of the generator and the automatic drain beneath the
generator. This is a gravity drain that should not be directly connected to any building drain. There
should be a minimum vertical gap of 2" between the building drain and generator drain hose. The drain
hose must be lower than the bottom of the generator and should be checked periodically for blockage.
ELECTRICAL SPECIFICATIONS
UNIT ELECTRICAL
CHARACTERISTICS
POWER
CURRENT
DRAW
208 V, 3 PH, 60 HZ 36
K.W.
24 K.W.
100
Amp
67 Amp
240 V, 3 PH, 60 HZ 48
K.W.
36 K.W
.
24 K.W.
116
Amp
87
Amp
58 Amp
480 V, 3 PH, 60 HZ 48
K.W.
36
K.W.
24 K.W.
58 A
mp
44
Amp
29 Amp
4
Initial Start-Up
Now that the steam generator has been installed, the unit should be tested to ensure that it is
operating correctly.
1. Remove all literature and packing materials from the interior and exterior of the unit.
2. If no steam connections have been made, attach a hose to the steam outlet at the top of the
steam generator and pipe to a drain.
3. Push the ON/OFF switch on the cabinet front panel to the "ON" position. The unit will auto-
matically fill with water. When the water level in the gauge glass reaches the full mark, wait
30 seconds, then push the ON/OFF switch to "RESET". The unit will then start heating and
the indicator light will come on. .
4. If connections to a steamer or a kettle have been made, check for steam by:
a. Turning on the steamer and checking for steam inside the cavity.
b. Filling the kettle with water, turning it on, and making sure that the water heats up.
If a hose connection (2.) has been made, check for steam at the end of the hose.
In all cases, presence of steam should be verified within 40 minutes.
5. To shut down the unit push the ON/OFF switch to the "OFF" position. The boiler will drain
automatically.
If the generator has functioned as described above, the unit is ready for use. If the unit does not
function as intended, call your local Groen Authorized Service Agent.
Operation
A. Controls
The operating control for the steam generator is the ON/OFF switch on the cabinet front panel.
This control is used to call for electrical power to the unit by pushing the switch lever to the "ON"
position; to start the unit by pushing the lever to the "RESET" position: to restart the unit in the
event that a low water condition cuts off the power (push to "RESET" again): and, finally, to shut
down the unit by pushing the switch to the "OFF" position.
B. Operating Procedure
(1) Push the ON/OFF switch to the "ON" position. The unit will automatically fill with water.
Wait 30 seconds after the water level reaches the full mark on the gauge glass, then push
the ON/OFF switch to "RESET". The generator will then start heating, and the switch will
automatically return to the "ON" position.
(2) To shut down the unit, push the ON/OFF switch down to the "OFF" position. The generator
will drain completely.
(3) If the generator pressure ever reaches 14-1/2 PSI, the safety pressure switch will shut off
power to the unit. In this case, after pressure has dropped back to the normal operating
range, turn the ON/OFF switch to "RESET" to put the generator back into operation.
5
Sequence of Operation
Pushing the power switch to the "ON" position will cause the water valve to open, filling the
generator until the level probe senses the proper water level. The feed valve will then close. After a
30 second delay, pushing the power switch to the "RESET" position will close the contactors,
feeding power to the heating elements.
The air vent is open at this point and will remain open until the temperature in the generator
reaches 200 °F. As evaporation occurs in the generator and the water breaks from the probe, the
water feed valve will open and the 20 second time delay will activate. If the water level fails to rise
to the probe before the time delay times out, the contactors will open and the controls will have to
be manually reset. In normal operation, the water level will rise to the probe within the time delay
period and there will be no interruption in heating.
When pressure in the generator reaches 13-1/2 PSI, the pressure switch will cause the contactors
to open, shutting off the heating elements. When the pressure falls to 12 PSI, the pressure switch
will close the contactors, and heating will resume. The generator will then operate between 12 PSI
and 13-1/2 PSI, if no steam is being drawn from it.
If pressure in the generator ever reaches 14-1/2 PSI, the high-limit pressure switch will open the
contactors, and the generator will need to be reset manually after the pressure drops below 13-1/2
PSI.
Should pressure in the generator exceed 15 PSI at any time, the pressure relief valve will open.
When the power switch is turned to the "OFF" position, power to the elements will be cut off and
the automatic drain valve will open, draining the unit completely.
Maintenance & Cleaning
CAUTION: Use of any replacement parts other than those supplied by Groen or their authorized distributor
VOIDS ALL WARRANTIES.
Service performed by other than factory authorized personnel WILL VOID ALL WARRANTIES.
The steam generator is designed to require minimum maintenance, but certain parts may need replacement
after prolonged use.
After installation, no user adjustment should be necessary.
WARNING: ELECTRIC POWER SHOULD ALWAYS BE SHUT OFF BEFORE ANY
WORK IS DONE ON INTERNAL COMPONENTS.
A. Periodic Inspection
It is recommended that service personnel check the unit at least once a year. This periodic maintenance
should include inspecting electrical wires and connections, cleaning the inside of the control console, and
possible adjustment of the level control.
A maintenance and service log is provided with the warranty information. Each time maintenance is
performed on your Groen equipment, enter the date on which the work was done, what was done, and
who did the work. File the log with the warranty.
6
Maintenance & Cleaning (cont'd)
In addition to this yearly inspection, the following items should be checked weekly to ensure minimum
equipment down time and to help guarantee efficient operation:
1. The pressure gauge should be in working order.
2. Water level in the steam generator should be between the lines on the level gauge glass during
operation.
3. The strainers in the drain and feed lines should be cleared.
B. Component Replacement
The NEB steam generator is easy to service because of the accessibility of control components and
simplicity of design. An examination of the circuit diagram shows that, in most instances, a faulty
component can be isolated with a jumper wire.
WARNING: USE ONLY GROEN SUPPLIED PARTS. SUBSTITUTION OF UNAUTHORIZED
PARTS OR GENERIC PARTS CAN CAUSE BODILY INJURY TO THE OPERATOR
AND DAMAGE TO THE EQUIPMENT.
Before replacing any parts, COMPLETELY SHUT OFF THE ELECTRIC POWER SUPPLY. All internal
wiring is marked as shown on the circuit schematic drawing. Be sure new components are wired in the
same manner as the old components.
C. General Cleaning Instructions
The generator will automatically drain completely every time it is turned off. This must be done every day to
decrease build-up of scale inside the generator.
In addition to this daily clean-out, once a month the routine below should be followed:
WARNING: BEFORE YOU BEGIN TO CLEAN THE UNIT, UNPLUG THE POWER SUPPLY CORD,
OR DISCONNECT THE ELECTRIC POWER SUPPLY AT THE CIRCUIT BREAKER OR
FUSE BOX.
1. Turn the steam generator completely off, following the instructions in the "Operation" section.
2. Allow the generator to cool down UNTIL THE PRESSURE GAUGE READS "0" PSI.
3. Remove the flush plug from the front of the generator.
4. Wash out the inside of the generator with a water hose. The rinse water, along with the accumulated
solids, will wash down the drain.
5. Replace the flush plug. Use pipe joint compound or teflon tape on the threads to ensure a tight seal,
and tighten the plug securely.
WARNING: AVOID RISK OF ELECTRICAL SHOCK AND DAMAGE TO ELECTRICAL
COMPONENTS— DO NOT HOSE DOWN OR SPRAY THE EXTERIOR OF THE
GENERATOR.
As an alternative to the routine above, you may take the following steps:
1. Turn the generator off and allow it to cool.
2. Push the "ON/OFF" switch to "ON", so water will flow into the generator.
3. Open the manual drain valve and allow the unit to flush itself out for approximately 15 minutes.
4. Close the manual drain valve.
5. Turn the unit "OFF".
7
Troubleshooting
The generator is designed to operate smoothly and efficiently if properly maintained. However, in the event of a
problem, the following list of checks may be employed. If an item on the list is followed by an asterisk (*), the
work should be done only by a factory authorized service representative.
NOTE: A wiring diagram is furnished on the inside of the cabinet door. The wiring of controls may be checked
against this diagram.
SYMPTOM
WHAT TO CHECK
Water does not enter generator. a.
That the main water supply valve for the building is
open, and that water is being supplied to the
building.
b.
Water supply service valve for the unit, to confirm
that it is open.
c.
That electric power is on. Check main circuit
breaker or fuse and power supply to the building.
d.
For a defective water level control board (by
checking continuity) or for a loose connection (Ref.
22).*
e.
For defective water feed solenoid valve. Check coil
for continuity, and replace, if defective (Ref. 12).*
f.
Wiring for continuity.*
g.
For a defect in the on/off switch (Ref. 1).*
h.
Water level sensing probe for defect or scale
accumulation. Clean or replace, if necessary (Ref.
8).*
i. Strainer for build-up of solids.
Generator overfills with water. a.
Levelness of unit, by placing a spirit level on top of
cabinet.
b.
Water level control. Clean and adjust, if necessary
(Ref. 8).*
c.
That water feed solenoid valve closes. Clean valve
seat and strainer, if necessary (Ref. 12).*
d.
That the water feed is connected to the correct
solenoid valve (NOT the drain valve).*
Generator underfills with water. a.
Levelness of unit, by placing a spirit level on top of
cabinet.
Water enters generator very slowly. a.
Strainer screen on water feed solenoid valve, and
clean or replace, if necessary (Ref. 12).*
b.
Seat of feed valve for dirt or lime accumulation.
Clean, If necessary (Ref. 12).*
c.
Pressure of water supply. Adjust to 25-30 PSI, if
necessary.*
Indicator light does not come on when generator is
reset.
a.
Water level. If it is low, wait for generator to refill.
b,
For defective indicator light (Ref. 2).*
c.
Wiring to indicator.*
8
SYMPTOM
WHAT TO CHECK
Generator fails to build up pressure when water level is
proper.
a. Heating elements. Replace if burned out*
b, Pressure gauge. Shut down generator and relieve all
pressure. If gauge does not return to zero, replace it.
(Ref. 3).*
c. Air vent, and replace, if defective (Ref. 9).*
d. Contactors. Listen for them to click on when
"RESET" is pressed. Replace, if defective (Ref. 27).*
e. Power supply for low voltage and low amperage.
Generator fails to cut off after reaching operating
pressure.
a. Pressure gauge. Shut down generator and relieve all
pressure. If gauge does not return to zero, replace it
(Ref. 3).*
b. Pressure switch. If set too high, adjust. If defective,
replace (Ref. 16).*
c. That power to elements is cut off when operating
pressure is reached. If not, check the wiring.*
Safety valve pops. a. True pressure in generator.*
(1) If pressure goes over 15 PSI, adjust or replace
pressure switch (Ref. 16).*
(2) If pressure stays under 14-1/2
PSI:
(a) Clean safety valve.
(b) Replace safety valve with an identical valve
stamped "HV" (Ref. 4).*
(3) If pressure gauge reads incorrectly, replace it
(Ref. 3).*
Generator builds up pressure, shuts down, and fails to
come on again.
a. High-limit switch. If set too low, adjust and reset. If
defective, replace (Ref. 15).*
b. Operating pressure switch. If set too high, adjust. If
defective, replace (Ref. 16).*
c. Water level. If low, see "Symptoms" above, "Water
does not enter generator" and "Water enters
generator very slowly".
d. That time delay relay allows 20 seconds for
generator to refill with water (Ref. 26).*
e. For water pressure too low to refill generator within
20 seconds.*
Generator cuts out after 10 to 15 minutes of operation. a. Water level. If low, see "Symptoms" above, "Water
does not enter generator" and "Water enters
generator very slowly".
b. Time delay relay. If defective, replace (Ref. 26).*
c. Connections for time delay relay.*
d. That time delay relay allows 20 seconds for
generator to refill with water (Ref. 26).*
9
To order parts, contact your authorized Groen Service Agency. Supply the model designation,
part description, part number, and quantity desired, and, where applicable, voltage and phase.
ITEM
PART
NO.
DESCRIPTION ITEM
PART
NO.
DESCRIPTION
1 26753 SWITCH, 3 POSITION 18 02577 TERMINAL BLOCK
2 02986 LAMP, RED 115V 19 03494 GASKET. HEATER ELEMENT
3 59407 GAUGE. PRESSURE 20 05574 NUT. 5/16-18
4 08639 VALVE. SAFETY 15P5I 21 51159 HEATING ELEMENT 208V
5 54196 FITTINGS KIT. SIGHT GLASS
51355 HEATING ELEMENT 240V
6 08917 GASKET, GAUGE GLASS
51358 HEATING ELEMENT 480V
7 08742 TUBE, GAUGE GLASS 22 05958 BOARD, WATER LEVEL CONTROL
8 14356 ELECTRODE, WATER LEVEL 23 55837 INSULATOR WATER LEVEL BOARD
9 03824 VENT, THERMOSTAT 24 03651 RELAY, CONTROL
10 56963 FUSE, 3 AMP 600V 25 03361 SOCKET. RELAY OCTAL
11 04326 FUSEHOLDER 26 49980 RELAY. DELAY
12 11043 VALVE. SOLENOID 1/2 " N P.T. 27 09574 CONTACTOR, 3 AMP, 3 POLE 11 5V
13 45398 VALVE. SOLENOID 1/4" N.P.T. 28 41125 TERMINAL BLOCK
14 04181 STRAINER, Y TYPE 12" N.P.T. 29 44160 THERMOSTAT
15 03861 CONTROL, STEAM PRESSURE, HIGH-LIMIT 30 01669 CONNECTOR STRAIGHT 3/8 SEALTITE
16 4441 1 SWITCH, PRESSURE 31 45401 VALVE, SOLENOID 1/2" N P.T.
17 03940 TRANSFORMER 32 60198 VALVE, BALL 1/2" N.P.T
33 02863 GROUND LUG
10
Parts List
NEB Electrical Schematics
24 KW Generator
36 KW Generator
11
Reference
NATIONAL FIRE PROTECTION ASSOCIATION
60 Battery March Park
Quincy, Massachusetts 02269
Installation of Gas Appliances & Gas
Piping The National Electric Code
Ventilating Hoods
48 KW Generator
Reference
NATIONAL FIRE PROTECTION ASSOCIATION
60 Battery March Park
Quincy, Massachusetts 02269
NFPA/54
Installatin of Gas Appliances & Gas Piping
NFPA/70
The National Electric Code
NFPA/96
Ventilating Hoods
12
NFPA/54
NFPA/70
NFPA/96
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