Groen NGB/3E, CNGB/3-24 Operator's Manual

OPERATOR MANUAL

IMPORTANT INFORMATION, KEEP FOR OPERATOR

This manual provides information for:

MODEL NGB/3E
& CNGB/3-24
STEAM BOILERS

· Gas Heat

· 200,000 BTU/hr Firing Rate

· 3.7 Effective Boiler Horsepower

READ, UNDERSTAND AND FOLLOW THE INSTRUCTIONS AND
WARNINGS CONTAINED IN THIS MANUAL.

.ECNEREFER ERUTUF ROF DENIATER EB TSUM LAUNAM SIHT

WARNING / FOR YOUR SAFETY

and liquids in the vicinity of this or any other appliance.

POST IN A PROMINENT LOCATION

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.

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.

PART NUMBER 121003 REV D (07/14)

1055 Mendell Davis Drive

Jackson, MS 39272

888-994-7636, fax [phone]

unifiedbrands.net

IMPORTANT - READ FIRST - IMPORTANT

WARNING: THE UNIT MUST BE INSTALLED BY PERSONNEL QUALIFIED TO WORK WITH GAS, ELECTRICITY AND

PLUMBING. IMPROPER INSTALLATION CAN CAUSE INJURY TO PERSONNEL AND/OR DAMAGE TO
THE EQUIPMENT. THE UNIT MUST BE INSTALLED IN ACCORDANCE WITH APPLICABLE CODES.

NOTICE: LEVEL THE UNIT BEFORE USE. IT MAY BE PITCHED SLIGHTLY TO THE REAR.

CAUTION: AN ELECTRICAL GROUND IS REQUIRED.

CAUTION: DO NOT LOCATE THE BOILER CABINET DIRECTLY OVER A FLOOR DRAIN OR FLOOR SINK. HUMIDITY

OR WATER FROM A DRAIN WILL DAMAGE ELECTRICAL PARTS OF THE UNIT.

WARNING: TO AVOID DAMAGE OR INJURY, FOLLOW THE WIRING DIAGRAM EXACTLY WHEN CONNECTING A

UNIT.

CAUTION: DO NOT USE PLASTIC PIPE. DRAIN MUST BE RATED FOR STEAM AND BOILING WATER.

WARNING: DO NOT CONNECT THE 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.

NOTICE: DO NOT USE A DE-GREASER THAT CONTAINS POTASSIUM HYDROXIDE OR SODIUM HYDROXIDE OR

THAT IS HIGHLY ALKALINE.

WARNING: USE OF ANY REPLACEMENT PARTS OTHER THAN THOSE SUPPLIED BY GROEN OR THEIR

AUTHORIZED DISTRIBUTOR VOIDS ALL WARRANTIES AND CAN CAUSE BODILY INJURY TO THE
OPERATOR AND DAMAGE THE EQUIPMENT. SERVICE PERFORMED BY OTHER THAN FACTORY­AUTHORIZED PERSONNEL WILL VOID ALL WARRANTIES.

WARNING: HIGH VOLTAGE EXISTS INSIDE CONTROL COMPARTMENTS. DISCONNECT POWER SOURCE 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.

CAUTION: MAKING ANY ELECTRICAL OR MECHANICAL CHANGE IN THE UNIT WITHOUT PRIOR WRITTEN

APPROVAL FROM GROEN ENGINEERING WILL VOID ALL WARRANTIES.

WARNING: ALL POTENTIAL USERS OF THE EQUIPMENT SHOULD BE TRAINED IN SAFE AND CORRECT

OPERATING PROCEDURES.

WARNING: DO NOT OPERATE THE UNIT UNLESS ALL REMOVABLE PANELS (RIGHT, LEFT, FRONT AND REAR)

HAVE BEEN PROPERLY INSTALLED.

2 OM-NGB/3

Table of Contents

Important Operator Warnings ...................................................... page 2

References..................................................................................... page 3

Equipment Description.................................................................. page 4

Water Quality and 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 19

Service Log ................................................................................. page 20

References

NATIONAL FIRE PROTECTION ASSOCIATION
60 Batterymarch Park
Quincy, Massachusetts 02269

NFPA/70 The National Electrical Code
NFPA/54 Installation of Gas Appliances & Piping
NFPA/96 Ventilating Hoods

NSF INTERNATIONAL
789 N. Dixboro Rd.
P.O. Box 130140
Ann Arbor, Michigan 48113

CSA INTERNATIONAL
8501 Ease Pleasant Valley Road
Cleveland, Ohio 44131

AMERICAN NATIONAL STANDARDS INSTITUTE
1403 Broadway, New York, New York 10018

Z21.30 Installation of Gas Appliances & Piping
Z223.1 (latest edition) National Fuel Gas Code

OM-NGB/3 3

Equipment Description

Groen NGB/3E and CNGB/3-24 steam boilers generate low pressure steam for use
with HyPlus cabinet mounted steamers and steam jacketed kettles. Both models
use a spark ignition system. 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” wide by 34-3/16” deep by 29-3/16” 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 required instruments, fittings, and
controls per CSD-1 (Controls and Safety Devices for automatically fired boilers).

Heat transfer fins inside the combustion chamber add to the unit’s high efficiency.
Both units are rated as 60% efficient or better, with a firing rate of 200,000 BTU per
hour using natural or propane gas. Energy output is 120,000 BTU per hour, with an
effective boiler horsepower of 3.7.

4 OM-NGB/3

Water Quality & Treatment

REDUCE SCALE PROBLEMS BY USING

AND MAINTAINING A WATER SOFTENER

FOR YOUR STEAMER!

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.

OM-NGB/3 5

Installation

WARNING

MAKING ANY ELECTRICAL OR MECHANICAL

CHANGE IN THE UNIT WITHOUT PRIOR

GROEN APPROVAL WILL VOID ALL

WARRANTIES.

WARNING

THE UNIT MUST BE INSTALLED BY

PERSONNEL WHO ARE QUALIFIED TO WORK

WITH GAS, ELECTRICITY AND PLUMBING.

IMPROPER INSTALLATION CAN CAUSE

INJURY TO PERSONNEL AND/OR DAMAGE

TO THE EQUIPMENT. THE UNIT MUST

BE INSTALLED IN ACCORDANCE WITH
APPLICABLE CODES. THE UNIT MUST BE
INSTALLED BY A LICENSED PLUMBER OR

GAS FITTER WHEN INSTALLED WITHIN THE

COMMONWEALTH OF MASSACHUSETTS.

WHEN THE UNIT IS RECEIVED, IMMEDIATELY INSPECT IT FOR EXTERNAL OR INTERNAL
DAMAGE. REPORT ANY DAMAGE TO THE FREIGHT CARRIER.
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 2 inches
Left Side 4 inches
Rear 6 inches

In order to service the unit properly, access with at least 24 inches clearance is
needed on the right side.

Install the unit in a well-vented room so that there is an adequate air supply. Since
products of combustion come out of its flue, the appliance must be located under a
ventilation hood. Do not directly vent the flue.

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.

A free flow of air around the boiler promotes efficient operation. Items which might
restrict air flow must be removed. After installation, do not obstruct the flue, or any
front, side, rear or top vents. Similarly, keep the area directly around the appliance
clear of combustible material.

Installation must conform with local codes, or in the absence of local codes, with the
National Fuel Gas Code, ANSI Z223.1 (latest edition, including the following paragraph:

“The unit and its individual shut-off valve must be disconnected from the gas supply
piping system during any pressure testing of that system at test pressures in excess
of 1⁄2 PSI (3.45 kPA). The unit must be isolated from the gas piping system by closing
its individual manual shut-off valve during any pressure testing of the gas supply
piping system at test pressures equal to or less than 1⁄2 PSI (3.45 kPA).”

1. Gas Supply Connection

a. Connection to the gas supply can be completed with 1/2” NPT pipe

or approved equivalent. Although this is the diameter for immediate
connection to the unit, gas supply piping must be large enough to
provide volumes and pressure sufficient for 200,000 BTU per hour.
Supply pressure must be at least 5.0” W.C. (14.0” W.C. maximum) for
natural gas or 11.0 W.C. (14.0” W.C. maximum) for propane.

b. In Canada, the installation must conform to the Canada Gas Code, CAN

1-B149 (Installation Codes for Gas Burning Appliances and Equipment),
and/or local codes.

c. After the unit has been connected to the gas supply, check piping joints

for leaks. Do NOT use flame to check for leaks. A thick soap solution or
other suitable leak detector should be used.

2. Electrical Supply Connection

a. The maximum electrical load is 4 AMP. You must provide 115 Volt

Alternating Current, 60 Hz, 1PH, 15 AMP service. Local codes and/or the
National Electrical Code should be followed (ANSI/NFPA-70-1987 - or
latest edition). AN ELECTRICAL GROUND IS REQUIRED.

6 OM-NGB/3

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.

Installation

b. 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.

3. Water 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. If it is over 60 PSI,

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 boiler uses a maximum of 12.9 gallons of water per hour. Piping

should be sized to handle total water consumption.

4. Drain Connection

a. The drain connection is made at the 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 or less. If the distance to the drain is further than
six feet, use 2” NPT piping.

Leave a two-inch air gap between the

hose and the building drain, and don’t

allow water traps in the line.

b. The drain line must be installed with a constant downward pitch. Do

not permit any water traps in the line. DO NOT CONNECT THE LINE
DIRECTLY TO ANY BUILDING DRAIN. A vertical air gap of at least two
inches must be maintained between the drain line and the building drain
unless otherwise specified by local plumbing codes.

OM-NGB/3 7

Operating Controls are located on the

front of the cabinet base unit.

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. Make sure the gas supply line is open, and turn on the gas valve.

Turn the knob on the gas valve to the “ON” position.

NOTE: The “trial for ignition” period is approximately 90 seconds after the on/off

switch is turned to the “ON” position. (Refer to the Control Panel illustration in
the Operation Section).

During initial start-up several trials may be necessary to remove air from the gas

piping. Subsequent start-ups should only need about five seconds for the pilot to
light. If the pilot burner does not light within the trial period, the ignition system
will automatically stop gas flow to the pilot burner, and terminate the ignition
trial. If this happens, turn the switch to “OFF” and then “ON” again, to repeat the
trial for ignition.

5. Turn the on/off switch on the cabinet front panel to the “ON” position:

• The amber light in the switch will come on

• The boiler drain valve will close

• 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

• The RESET light will go out

• The main burner will light

When the water level reaches the “hi” probe, the water supply to the boiler will

shut off.

6. After about 15 minutes, the pressure on the gauge will rise. When the pressure
reaches 9- 1/2 PSI, the main burner will turn off. Thereafter, as pressure
decreases, the burner will automatically re-light to maintain the 9-1/2 PSI level.
The pilot burner should stay lit, even though the main burner cycles on and off.

7. To shut the unit down, turn the on/off switch to OFF. When it has cooled to
approximately 170ºF, the boiler will automatically drain.

The pilot is off when the on/off switch is OFF.

If the boiler functions as described above, it is ready for use. If it does not, contact
your authorized Groen Service Agent.

8 OM-NGB/3

Operation

WARNING

ALL POTENTIAL USERS OF THE EQUIPMENT

SHOULD BE TRAINED IN SAFE AND CORRECT

OPERATING PROCEDURES.

A. 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.

d. In addition to operating these controls, there are gas supply controls

located on the gas valve.

For NGB/3E: When the control knob is “ON,” gas flows to the pilot, as

well as to the main burners.

B. Operating Procedure

a. Turn on the water supply to the unit.

b. Turn on electrical power to the unit.

c. Turn on the gas supply to the unit, and turn on the gas valve.

Turn the control knob .on the gas valve to the “ON” position.

NOTE: The “ignition trial” period runs for approximately 90 seconds after the on/

off switch is turned ON. This means that if the pilot light does not light within
the “trial” period, the ignition system will automatically stop the gas flow and
terminate the ignition trial. If ignition is terminated, turn the switch off and then
“ON” again to repeat the trial. Normally, the pilot should light within five seconds
of turning on the unit.

d. Turn the on/off switch on the front of the cabinet to “ON.”

1) The amber light will come on.

2) The boiler drain valve will close and the unit will fill with water.

3) When the water reaches the “mid” probe, the red RESET light
will come on.

4) Press the start switch.

5) The green light in the switch will come on, the RESET light will
go off, and the main burner will light.

6) 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 9-1/2 PSI, the main burner will
shut off. Thereafter, the burner will periodically relight to maintain
the pressure at 9-1/2 PSI. The pilot light should stay lit when the
burner is off.

f. To shut down the unit, turn the on/off switch to OFF. The unit will drain

automatically after it has cooled to about 170ºF. The unit turns off the
pilot light when the on/off switch is turned to OFF.

OM-NGB/3 9

Sequence 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.

The gas valve has a step-opening feature. When the control calls for the main burner
to light, the outlet pressure of the valve is maintained at a preset (non-adjustable) rate
for several seconds, before full rated pressure is allowed to develop.

Once the main burner shuts down, step-opening gas valves need at least 60 seconds
to reset. If an attempt to re-light the burner is made before these valves reset, it may
bypass or shorten the length of the low pressure step, and could re-light the main
burner under full flow rate.

A thermostatically-controlled air vent remains open while the boiler fills. As steam
begins to develop, this vent will close. Some steam may escape from this vent before
it is fully closed (at approximately 200ºF).

Once the pressure has reached 9-1/2 PSI, the main burner will be shut off by an
operating pressure switch. Residual heat stored in the boiler’s heat exchanger can,
however, cause the pressure to continue to build, even after the burner has shut down.
This is especially true when the unit is heated for the first time.

If/when the pressure reaches 12 PSI, a relief valve will open to prevent pressure from
increasing past 12 PSI. As pressure decreases, the main burner will automatically re­light to maintain 9-1/2 PSI.

Even if something causes the pressure to pass 12PSI, a high-limit safety switch will
shut down the boiler electrically when it reaches 14-1/2 PSI. 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 electrical power is turned off, the gas valve automatically shuts off flow to the
main gas burner.

A thermostatic switch (mounted on the boiler shell) keeps the drain valve closed until
the temperature drops to approximately 170ºF.

At that point, the thermostatic switch opens and water drains from the boiler. A
vacuum breaker allows air to enter the boiler for this purpose.

10 OM-NGB/3

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.

Whenever the boiler is turned off and allowed to cool to about 170ºF, 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.

A. Suggested Tools

a. 1/2” hardened square wrench extension
b. Pipe Joint compound (approved for 300ºF steam)
c. 32 oz. Groen Delimer Descaler (PN 114800), or equivalent
d. Groen Spray Degreaser (PN 114801, or equivalent
e. Nylon pad(s)

B. 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.

The manual drain valve is

located under the boiler.

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” NPT
pipe plugs from the front of the boiler.

8. Pour 32 ounces of de-limer (Groen Delimer Descaler - Part Number

114800), or equivalent) 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.

OM-NGB/3 11

Cleaning

WARNING

SOLUTION AND VALVES WILL BE VERY HOT,

AND MAY CAUSE BURNS. PROTECT HANDS

FROM HOT SURFACES AND CONTINUE TO

USE PROTECTIVE GLOVES.

13. 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.

12 OM-NGB/3

Maintenance

WARNING

USE ONLY GROEN-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.

Your Groen 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 Groen personnel or Authorized Groen
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.

A. 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. Air inlets for gas burner jets (clean?)

5. Pilot burner flame (blue? Envelops sensor?)

6. Drain piping (free running? No blockage?)

One of the pressure relief safety valves is

located on the top left rear of the boiler.

At least twice each month, check the safety valve to be sure it is working properly.

When pressure reaches five PSI on the gauge, lift the lever to vent steam, then
release it, allowing it to snap back into place.

B. Component Replacement

NGB/3E boilers are easy to service. The design is simple, and controls are readily

accessible.

Before replacing any part, COMPLETELY SHUT OFF THE GAS AND ELECTRICAL

POWER TO THE UNIT. When breaking (opening) a gas pipe connection, allow five
minutes for gas to dissipate before proceeding.

When the pipes have been reconnected, check for leaks with a thick soap solution

or other suitable leak detector. Do not use flame to check for gas leaks.

OM-NGB/3 13

Troubleshooting

Do not operate the unit if it malfunctions or has damaged or broken parts. NGB/3 and NGB/3/E steam boilers are designed to operate
smoothly and efficiently 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/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

Boiler overlls with water. User a. Is the boiler level? Check levelness of unit with a spirit level.

Authorized

Service Rep Only

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?

Authorized

Service Rep Only

RESET light does not come
on.

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)

b. Is the water pressure too high? (Greater than 60 PSI?)

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)

b. Is the water pressure too low? (Less than 30 PSI)?
c. Is the water supply line too small?

d. Is the water ll solenoid defective? (X)

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)

Pilot burner will not light
(spark ignition).

Pilot burner will not stay lit. Authorized

14 OM-NGB/3

User a. Is supply gas valve open?

Authorized

Service Rep Only

Service Rep Only

b. Is gas valve knob in the “ON” position?
c. Is the boiler lled with water? Is the green light in the start switch

“ON”?

d. Does the pilot ame require adjustment? Screw attachment on

gas valve. (X)
e. Is the gas valve defective? (X)

a. Does the pilot ame require adjustment? Screw attachment on

gas valve. (X)

Troubleshooting

Main burner will not light
(spark ignition).

Boiler does not build
pressure with main burner lit.

Main burner does not shut off
after reaching operating
pressure.

Boiler builds pressure but
shuts down. RESET light
comes on.

User a. Is pilot burner lit?

b. Is the boiler lled with water? Is the green light in the start switch

“ON”?

Authorized

Service Rep Only

User a. Is the steam power take-off valve open or leaking?

Authorized

Service Rep Only

User a. Is the pressure gauge defective?

Authorized

Service Rep Only

User a. Is the water level below the “mid” water level probe? Verify that

c. Is the igniter-sensor defective? (X)
d. Is the gas valve defective? (X)
e. Is the spark ignition module defective? (X)

b. Is the pressure gauge defective?

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)

e. Is the burner BTU output low? Check the gas pressure at the

burner. Adjust at the gas valve, if necessary. (X)

b. Is the gas valve defective?

c. Is the operating pressure switch defective? No adjustment is

allowed. Replace the switch if defective. (X)

the water supply is sufcient to maintain the water level at or
above the “mid” water level probe.

Authorized

Service Rep Only

Safety relief valve opens. Authorized

Service Rep Only

Boiler blows down
immediately when turned off.

Boiler does not drain. User a. Is the thermostatic switch defective?

Authorized

Service Rep Only

b. Is the operating pressure switch defective? No adjustment is

allowed. Replace the switch if defective. NOTE: If the high­limit 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)

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)

a. Is the thermostatic switch defective? Check for loose electrical

connections on switch. (X)

b. Is the solenoid drain valve defective?
c. Are the solenoid drain valve or hoses blocked?

OM-NGB/3 15

Parts List

NGB/3 Burner & Gas Valve

Key Description Part #

1 Baffle Plate 083076

2 Pilot Burner Mounting

Bracket

3 Pilot Burner W/ Spark

Igniter-sensor

4 Shield for Pilot Burner 102260

5 Flame Deflector (Single

Loop) Holder for #640

7a Main Burner Assy 0-2000 Ft.

Elev.(Incl. (29) Gas Jets
W/ #54 Drill Dia Hole) For
Natural Gas

7a Main Burner Assy 0-2000 Ft.

Elev.(Incl. (29) Gas Jets
W/ #68 Drill Dia Hole) For
Propane Gas

8 Gas Valve (Spark Ignition)

For Natural Gas

8 Gas Valve (Spark Ignition)

For Propane Gas

9 Spark Ignition Module 085153

10 Ignition Cable 106495

11 Burner Mounting Bracket 050490

12 Kit, Spark Ignition Module

(Included Bracket, Module
and Cable)

102257

102258

056965

047267

050491

101497

104391

137312

12

11

16 OM-NGB/3

Key Description Part #

1 Boiler Weldment MS98221

2 Sight Glass Assembly 121754

3 Kit, Repair - Sight Glass 097099

4 Flue Assembly 099217

5 Safety Valve (15PSI) 102297

6 Pressure Relief Valve (12PSI) 099228

Parts List

NGB/3 Boiler

7 Water Level Probes (lo, med,

hi)

8 Solenoid Valve (Water-in) 099220

9 Check Valve 004187

10 Air Vent 145167

11 Vacuum Breaker 090787

12 Globe Valve 1/2”NPT 099255

13 Operating Pressure

Switch-9½ PSI

14 Hi-limit Pressure

Switch-14½ PSI

15 Pressure Gauge 078000

16 Solenoid Valve (Drain) 074594

17 Ball Valve (3/4” NPT) 003436

18 Thermostatic Switch 077985

076526

099222

118255

OM-NGB/3 17

Key Description Part #

1 Switch “On/off” 088876

2 Switch “Start” (Momentary) 099290

3 Indicator Light “Reset” 099289

4 Light, Indicator Amber 116384

5 Light, Indicator Red (2) 116383

6 Terminal Block, 2-Pole 003887

Parts List

NGB/3 Electrical Controls

124

- Bushing Snap 11/16” ID 012864

7 Circuit Board Support 099292

8 Water Level Control Board

Assembly

9 Lug, Ground 14-6 AWG 119829

10 Circuit Breaker 119860

11 Transformer, 75VAC 121715

12 Relay, DPDT 24VAC 30A 121733

13 Water Level Control Board

Assembly

- Harness, Electrical Box 130446

14 Bracket, Circuit Breaker 137254

15 Electronic Cabinet,

Weldment

116016

122192

137257

5 3

11 12 6 9 10 15

14

8

18 OM-NGB/3

13 7

Electrical Schematic

S1

1

2

3

4

SWITCH CONTACT ARRANGEMENT

VIEWED FROM REAR

ON SWITCH

12

4 3

S1

1

2

R

LOW WATER

12

Y

FILL

1

2

R

HI PRESSURE

RESET SWITCH

S2-1S2-2

B

A

R

RESET

S2-A

S2-B

G

READY LIGHT

S2

2

1

A

P2

J2

4 RED

2B LUE

12 BLUE

9 BLACK

5 BLACK

10 RED

6

7

8 WHITE

GRN

RED1

ORANGE3

ORANGE

BROWN

4

3

B

TO T3

@

STEAMER

WHITE

BLACK

78

K1

SINGLE WATER LEVEL CONTROL

01

K1

TO 120V AC

HN GND

1

CB1
10A

2

120V

3A

24VAC

HI

75VA

T1

DUAL WATER LEVEL CONTROL

3

2

C1

C2

BROWN

C

K1

NC1

NO2

NO

H

LLCO

G

PC2

LLCO

G

4

WHITE

WHITE

N01

NC2

NC

L1
L2

L1
L2

FROM T2
@ STEAMER

TO K7 COIL
@ STEAMER

COM

BLACK

WHITE

21

SPRAY VALVE

LO

BROWN

PC1

P1 J1

11WHITE

1RED

2BLUE

3BROWN

5BLUE

6BROWN

8BLACK

7YELLOW

4BLACK

9RED

10BLACK

12BLACK

1

TSTAT

CLOSES @ 170°

14.5 PSI

HI LIMIT

C

HL

1 2

2

DRAIN VALVE

12

FILL VALVE

HI

PROBE

MID

PROBE

NO

NC

LO

PROBE

OPERATING PRESSURE

SW

9.5 PSI

C

PS

NC

TO SPARK

SPARK

SPARK IGNITION MODULE

24V

GND

PV

GND BURN

MV/PV

BLACK

YELLOW

BLUE

WHITE

G

MAIN

PILOT

H

C

G

MV

OM-NGB/3 19

GAS VALVE

Service Log

Model No: Purchased From:

Serial No: Location:

Date Purchased: Date Installed:

Purchase Order No: For Service Call:

Date Maintenance Performed Performed By

20 OM-NGB/3

Service Log

Model No: Purchased From:

Serial No: Location:

Date Purchased: Date Installed:

Purchase Order No: For Service Call:

Date Maintenance Performed Performed By

OM-NGB/3 21

Service Log

Model No: Purchased From:

Serial No: Location:

Date Purchased: Date Installed:

Purchase Order No: For Service Call:

Date Maintenance Performed Performed By

22 OM-NGB/3

Service Log

Model No: Purchased From:

Serial No: Location:

Date Purchased: Date Installed:

Purchase Order No: For Service Call:

Date Maintenance Performed Performed By

OM-NGB/3 23

1055 Mendell Davis Drive • Jackson MS 39272

888-994-7636 • 601-372-3903 • Fax [phone]

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PART NUMBER 121003 REV D (07/14)