Groen NEB/1 Manuale utente

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 888-864-7636

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

9.3

4.1

2.6

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)

7.3

3.3

4.1

2.6

90°C

480 24 29/50 10/6

10/8

5.8

3.3

2.5/4.1

2.5/3.2

2.6

75°C

90°C

480 36 44 1/0

8.3

4.1

2.6

75°C

90°C

480 48 58 2/0

9.3

5.8

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.

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.

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