Groen DH-CE Mark, DHT-CE Mark Operation Manual
OPERATOR MANUAL &
SERVICE MANUAL
IMPORTANT INFORMATION, KEEP FOR OPERATOR
This manual provides information for:
MODELS DH-CE Mark
& DHT-CE Mark International
STEAM JACKETED
KETTLES
· Self-Contained
· Stainless Steel
· Gas Heated
· Floor Mounted
· Tilting
DH
THIS MANUAL MUST BE RETAINED FOR FUTURE REFERENCE.
READ, UNDERSTAND AND FOLLOW THE INSTRUCTIONS AND
WARNINGS CONTAINED IN THIS MANUAL (THE SERVICE
MANUAL AND OPERATOR MANUAL SECTIONS).
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 128417, REV. D (6/06)
DHT
1055 Mendell Davis Drive
Jackson, MS 39272
888-994-7636, fax 888-864-7636
groen.com
OM/SM-DH-CE
IMPORTANT — READ FIRST — IMPORTANT
IT IS MOST IMPORTANT THAT THESE INSTRUCTIONS AND THE OPERATOR AND SERVICE
MANUALS BE CONSULTED BEFORE INSTALLING AND COMMISSIONING THE APPLIANCE.
FAILURE TO COMPLY WITH SPECIFIED PROCEDURES MAY RESULT IN DAMAGE OR THE NEED
FOR A SERVICE CALL.
THESE APPLIANCES HAVE BEEN CE MARKED ON THE BASIS OF COMPLIANCE WITH THE GAS
APPLIANCE DIRECTIVE, EMC AND LOW VOLTAGE DIRECTIVE FOR THE COUNTRIES, GAS TYPES
AND PRESSURES AS STATED ON THE DATA PLATE.
THESE APPLIANCES MUST BE INSTALLED BY A COMPETENT PERSON IN CONFORMITY WITH
INSTALLATION AND SERVICING INSTRUCTIONS AND NATIONAL REGULATIONS IN FORCE AT
THE TIME. PARTICULAR ATTENTION MUST BE PAID TO THE FOLLOWING:
I. E. E. REGULATIONS FOR ELECTRICAL INSTALLATIONS
ELECTRICITY AT WORK REGULATIONS
GAS SAFETY (INSTALLATION AND USE) REGULATIONS
HEALTH AND SAFETY AT WORK ACT
LOCAL AND NATIONAL BUILDING REGULATIONS
FIRE PRECAUTIONS ACT
DETAILED RECOMMENDATIONS ARE CONTAINED IN INSTITUTE OF GAS ENGINEERS
PUBLISHED DOCUMENTS: IGE/UP/1, IGE/UP/2, BS6173 AND BE5440. FURTHERMORE, IF A NEED
ARISES TO CONVERT THE APPLIANCE FOR USE WITH ANOTHER GAS, A COMPETENT PERSON
MUST BE CONSULTED. THOSE PARTS WHICH HAVE BEEN PROTECTED BY THE
MANUFACTURER MUST NOT BE ADJUSTED BY THE USER.
USERS SHOULD BE CONVERSANT WITH THE APPROPRIATE PROVISIONS OF THE FIRE
PRECAUTIONS ACT AND THE REQUIREMENTS OF THE GAS SAFETY REGULATIONS. IN
PARTICULAR THEY SHOULD BE AWARE OF THE NEED FOR REGULAR SERVICING BY A
COMPETENT PERSON TO ENSURE THE CONTINUED SAFE AND EFFICIENT PERFORMANCE OF
THE APPLIANCE.
WARNING: TO PREVENT SHOCKS, ALL APPLIANCES GAS OR ELECTRIC, MUST BE
EARTHED.
UPON COMPLETION OF THE INSTALLATION, THE OWNERS MANUAL SHOULD BE HANDED TO
THE USERS AND THE INSTALLER SHOULD INSTRUCT THE RESPONSIBLE PERSON(S) IN THE
CORRECT OPERATION AND MAINTENANCE OF THE APPLIANCE.
THIS EQUIPMENT IS ONLY FOR PROFESSIONAL USE, AND SHALL BE OPERATED BY QUALIFIED
PERSONS. IT IS THE RESPONSIBILITY OF THE SUPERVISOR OR EQUIVALENT TO ENSURE THAT
USERS WEAR SUITABLE PROTECTIVE CLOTHING AND TO DRAW ATTENTION TO THE FACT
THAT SOME PARTS BY NECESSITY WILL BECOME VERY HOT, AND WILL CAUSE BURNS IF
TOUCHED ACCIDENTALLY.
WARNING: BEFORE REMOVING ANY PARTITION OR PANEL, ALWAYS TURN OFF THE
ELECTRIC POWER AND ALLOW THE FAN TO STOP ROTATING. BEFORE
WORKING ON ANY ELECTRICAL COMPONENT, DISCONNECT THE POWER
SOURCE FROM THE UNIT.
NOTE: IT IS IMPORTANT THAT THE END-USER ROUTINELY EXAMINE THE FLUE OUTLET
ON A REGULAR BASIS. DEBRIS COVERING THE FLUE OUTLET CAN CAUSE A
POTENTIALLY HAZARDOUS CONDITION. REMOVE ANY FOREIGN MATERIAL
BEFORE USING THIS PIECE OF EQUIPMENT.
WARNINGS AND CAUTIONS PROVIDED IN THIS OPERATOR AND SERVICE MANUAL MUST BE
COMPLIED WITH.
2 OM/SM-DH CE
Contents
Regulations and Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Model Numbers, Net Weights & Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Siting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4 Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.5 Electrical Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.6 Gas Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.7 Total Gas Rate - Natural and Propane Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.8 Injector Diameters-Natural and Propane Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.9 Gas Pressure Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.10 Burner Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Assembly and Conditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Gas Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3 Electrical Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4 Jacket Water Level/Jacket Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.5 Pre-Commissioning Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.6 Instruction to User . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Servicing and Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2 Jacket Vacuum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3 Jacket Filling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.4 Water Treatment Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.5 Removal of Control Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.6 Removal of Spark Ignition Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.7 Removal of Low Water Level Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.8 Removal of Tilt Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.9 Removal of Gas Control Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.10 ON/OFF Switch and Reset Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.11 Removal of Neons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.12 Removal of Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.13 Removal of Pressure Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.14 Low Water Level Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.15 Removal of the Burners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.16 Spark Electrode/Flame Sensing Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.17 Removal of Pressure Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.18 Removal of Sight Glass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.19 Safety Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.20 Filling Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.21 Fuse Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5 User Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.1 Equipment Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.2 Lighting and Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.3 Cleaning and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Service Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
OM/SM-DH CE 3
Regulations and Safety Precautions
These Appliances have been CE marked on the basis of compliance with the Gas Appliance Directive,
EMC and Low Voltage Directive for the Countries, Gas Types and Pressures as stated on the Data Plate.
These appliances MUST BE installed by a competent person in conformity with the INSTALLATION AND
SERVICING INSTRUCTIONS and National Regulations in force at the time.
Particular attention MUST be paid to the following:
I.E.E. Regulations for Electrical Installations
Electricity at Work Regulations
Gas Safety (Installation & Use) Regulations
Health and Safety at Work Act
Fire Precautions Act
Local and National Building Regulations
Furthermore, if a need arises to convert the Appliance for use with another gas, a competent person must
be consulted. Those parts which have been protected by the manufacturer MUST NOT be adjusted by the
User.
Users should be conversant with the appropriate provisions of the Fire Precautions Act and the
requirements of the Gas Safety Regulations. In particular the need for regular servicing by a competent
person to ensure the continued safe and efficient performance of the Appliance.
WARNING
TO PREVENT SHOCKS, ALL APPLIANCES WHETHER GAS OR ELECTRIC, MUST BE EARTHED.
Upon completion of the installation, the Owners Manual should be handed to the users and the installer
should instruct the responsible person(s) on the correct operation and maintenance of the Appliance. This
equipment is ONLY FOR PROFESSIONAL USE, and shall be operated by QUALIFIED persons. It is the
responsibility of the Supervisor or equivalent to ensure that users wear SUITABLE PROTECTIVE
CLOTHING and to draw attention to the fact that, some parts will, by necessity, become VERY HOT and
will cause burns if touched accidentally.
IMPORTANT - READ FIRST - IMPORTANT The Groen Steam Jacketed Kettle you have just purchased
has been handcrafted from the finest materials, meticulously inspected, and carefully tested to ensure that
you receive the best possible product. With reasonable care and periodic maintenance, it will provide
years of faithful service. It is recommended that you establish a timetable for periodic maintenance as
outlined in this manual. Space is provided in the Service Log at the back of this manual.
4 OM/SM-DH CE
Section 1
Installation
UNLESS OTHERWISE STATED, PARTS WHICH HAVE BEEN PROTECTED BY THE
MANUFACTURER ARE NOT TO BE ADJUSTED BY THE INSTALLER.
1.1 Model Numbers, Net Weights and
Dimensions
MODEL•
DH-20 DH-40 DH-60
WIDTH
mm (inch)
890 (34.9) 1190 (46.8) 1190 (46.8)
DEPTH
mm (inch)
790 (31.0) 930 (36.5) 990 (38.9)
HEIGHT
mm (inch)
1040 (40.9) 1150 (45.2) 1240 (48.7)
WEIGHT
Kg
245 295 400
WEIGHT
lbs
535 645 880
1.2 Siting
The appliance should be installed on a level floor
in a well lit and draught free position.
The installation of the appliance must be
executed in accordance with local and/or
national regulations as listed in this manual.
1.3 Clearances
Minimum clearances of 150 mm (5.9 in) from the
sides of the appliance and 250 mm (9.8 in) from
the rear of the appliance are required if the
appliance is installed next to combustible
surfaces. A vertical clearance of 750 mm (29.6
in) minimum should be allowed between the top
rim of kettle and any overlying surface.
1.4 Ventilation
The unit must be installed in an adequately
ventilated room with a provision for adequate air
supply to the unit. The area directly around the
appliance must be cleared of all combustible
material. For multiple installations, the
requirements for individual appliances should be
added together. Installation should be made in
accordance with local and / or national
regulations applying at the time. A competent
installer must be employed.
WARNING
THE UNIT MUST BE INSTALLED BY
PERSONNEL QUALIFIED TO WORK WITH
ELECTRICITY AND GAS. IMPROPER
INSTALLATION CAN CAUSE INJURY TO
PERSONNEL AND/OR DAMAGE TO
EQUIPMENT. THE UNIT MUST BE
INSTALLED IN ACCORDANCE WITH ALL
APPLICABLE CODES.
CAUTION
THE APPLIANCE FLUE DISCHARGES
VERTICALLY FROM THE TOP OF THE UNIT
AT THE REAR. IT MUST NOT BE DIRECTLY
CONNECTED TO ANY FLUE, MECHANICAL
EXTRACTION SYSTEM, OR DUCTING
LEADING OUTSIDE THE BUILDING. THE
APPLIANCE IS BEST DISCHARGED UNDER
AN OPEN CANOPY WHICH CONNECTS
WITH A VENTILATING SYSTEM.
Recommendations for ventilation for catering
appliances are given in BS 5440:2 and are
shown in the table below.
Equipment
(Unit Type)
Ventilation Rate Required
m³ /min ft³ /min
Range 17 600
Pastry Oven 17 600
Fryer
26 900
Grill 17 600
Steak Grill
26 900
Boiling Pan 17 600
Steamer 17 600
Sterilizing Sink 14 500
Bains Marie 11 400
Tea/Coffee
Machine
8.5-14 300-500
1.5 Electrical Supply
This unit is designed for connection to fixed
wiring. A suitably rated isolating switch with
contact separation of at least 3 mm (0.12 in) on
OM/SM-DH CE 5
Gas and Electrical Connections are made at the rear of the unit.
both poles must be fitted to the installation and
the wiring executed in accordance with the
regulations listed in this manual.
Cable entry is at the lower rear on the right side
of the appliance. Access is gained by removing
relevant panels as described in Paragraphs
3.5.1 and 3.5.2.
Provide 230 VAC, 50 Hz, 1 Phase, 1 AMP or 40
Watts service. The electrical schematic is in the
service compartment and this manual.
WARNING
THIS APPLIANCE MUST BE EARTHED.
1.6 Gas Supply
Incoming service must be of sufficient size to
supply full rate without excessive pressure drop.
A gas meter is connected to the service pipe by
the Gas Supplier. Any existing meter should be
checked by the Gas Supplier to ensure that it
has capacity to pass the required rate of gas for
the kettle in addition to other installed gas
equipment.
The appliance governor is incorporated in the
gas control valve which is in the control cabinet.
The control valve governor is suitable for both
natural and propane gases without conversion.
Installation pipe work should be fitted in
accordance with IEGE/UP/2. The pipe work
should not be smaller than the gas inlet
connection on the kettle, i.e. Rp ½ (½'' B.S.P.)
An isolating cock must be located near the
appliance to allow shut down during emergency
or servicing. Test for gas soundness and purged
as specified in IGE/UP/1.
Water Supply-Not applicable.
1.7 Total Gas Rate - Natural (G20 and G25)
and Propane (G31) Gas
Model Kw BTU/hr
DH-20
18.6 63,500
DH-40
24.5 83,600
DH-60
39.6 135,200
6 OM/SM-DH CE
1.8 Injector Diameters-Natural and Propane
Gas (See Note, Paragraph 1.10 at right)
Model DH-20 DH/1-40 DH-60
Number of
Injectors
15 20 25
Natural
Gas G20
1.10 mm 1.25 mm 1.30 mm
Natural
Gas G25
1.20 mm 1.25 mm 1.40 mm
Propane
Gas G31
0.65 mm 0.75 mm 0.75 mm
1.9 Gas Pressure Adjustment
A pressure test point is fitted on the burner
manifold and on the gas control valve.
DH-20 DH/1-40 DH-60
Natural
Gas-G20
mBar
8.75 5.8 8.25
WCI* 3.5 2.3 3.3
Natural
Gas-G25
mBar 8.0 7.0 8.25
WCI* 3.2 2.8 3.3
Propane
Gas-G31
mBar 29 21 25
WCI* 11.6 8.4 10.0
*WCI = Water Column Inches
NOTE: With reference to gas rate, pressure
adjustments and conversions, this appliance
is CE-approved for use with the following
gases:
a) G20 natural gas may be supplied to the
appliance in Austria, Belgium, Denmark,
Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg,
Norway, Portugal, Spain, Sweden,
Switzerland and the United Kingdom.
b) G25 natural gas may be supplied to the
appliance in Belgium, France and the
Netherlands.
c) G31 propane gas may be supplied to the
appliance in France, Germany, Ireland,
the Netherlands, Portugal, Spain,
Switzerland, and the United Kingdom.
Use of the appliance with non-approved
gases in a listed country, or use in other
countries, will void CE certification.
1.10 Burner Adjustment
The burners are fixed aeration type and have no
provision for adjustment of air inlet.
OM/SM-DH CE 7
Before operation, check the water level and
jacket pressure.
Section 2
Assembly and Commissioning
2.1 Assembly
d) Unpack the appliance
b) Place on a firm, level floor. Adjust and fix the
feet.
CAUTION
SHIPPING STRAPS ARE UNDER TENSION
AND CAN SNAP BACK WHEN CUT. TAKE
CARE TO AVOID PERSONAL INJURY OR
DAMAGE FROM STAPLES LEFT IN THE
WALLS OF THE CARTON.
2.2 Gas Supply
Connect the unit to the gas supply and test for
gas soundness. For gas supply down stream of
the gas valve, leak detection spray or soap
solution may be used with the burners lit.
CAUTION
ENSURE THAT THE KETTLE CONTAINS
LIQUID WHEN THE BURNERS ARE ALIGHT.
2.3 Electrical Supply
Before commissioning the appliance, ensure that
the electrical installation has been carried out to
the relevant regulations (Paragraph 1.5).
WARNING
THIS APPLIANCE MUST BE EARTHED.
2.4 Jacket Water Level/Jacket Pressure
a) Ensure the water level in the jacket is
correct, by confirming that it is between the
sight glass marks. If it is low, follow
instructions in Paragraph 3.3.
b) Check the pressure gauge. If it does not
show 20 or more inches of vacuum (that is,
a reading of 20 to 30 below zero) see
"Jacket Vacuum" (Paragraph 3.2).
2.5 Pre-Commissioning Check
a) Prior to operation, clean out kettle pan
thoroughly using hot water and detergent.
Rinse pan thoroughly.
b) Remove all literature and packing materials
from the interior and exterior of the unit.
c) Ensure the open end or the elbow at the
outlet of the safety valve is directed down. If
not, turn the elbow to the correct position.
See detailed Instructions on Page 11 for
Safety Valve installation and operation.
2.5.1 Lighting Sequence
From Initial Start Up:
a) Put a small amount of water in kettle pan.
b) Ensure gas and electricity mains are “on.”
c) Switch the toggle switch to the "on" position.
d) Turn thermostat dial to desired setting.
e) Verify that spark igniter lights the burners.
8 OM/SM-DH CE
f) If the unit does not light, it will lock-out. Turn
it off and wait one or two minutes before
attempting to switch the unit on again.
g) Press reset lock-out switch and repeat steps
(b) to (e).
h) To switch unit off, switch toggle (On/Off)
switch to the "Off" position.
i) Turn gas and electricity mains off.
2.5.2 Setting The Gas Pressure
a) It is necessary to check the gas pressure
during commissioning. A pressure gauge
must be connected to the pressure test point
on the gas control valve or the gas manifold.
See figure above for test points.
b) When checking pressure at test points on
the gas valve, undo the screw a half turn and
slip tube over nipple.
c) Turn the main gas and electricity supply on.
d) Light the burners (Paragraph 2.5.1).
e) Remove control cabinet side panel screws.
f) Remove governor cap screw from control
valve. See figure for position on valve.
g) Governor is suitable for both natural and
propane gas.
h) To increase pressure turn the screw inside
the governor turret clockwise; anti-clockwise
to reduce pressure. Check the burner
pressure again after 15 minutes operation
and adjust if necessary.
i) Disconnect the pressure gauge from the test
point. Re-seal the pressure test point and
test for gas soundness.
j) Replace governor cap screw and replace lid
and panels.
2.5.3 Checking Performance of Controls
a) Light the unit. Check that controls quickly
and smoothly produce a healthy spark from
the electrode to the earthing post.
b) Turn thermostat off and then on. Check that
burners go out and reignite smoothly and
quickly when switched back on. Repeat
several times.
c) If the unit fails to respond as described, it
should be serviced by an authorized Groen
service agent.
2.6 Instruction to Installer
Important: After installing and
commissioning the appliance, the user's
instructions should be handed to the user or
purchaser. Ensure that the instructions for
lighting, turning off, correct use and cleaning
are properly understood. The location of the
main gas isolating valve should be
emphasized and the emergency shut down
procedure should be demonstrated.
OM/SM-DH CE 9
Section 3
Servicing and Conversion
IMPORTANT
BEFORE ATTEMPTING ANY SERVICING, ENSURE THAT THE ISOLATING COCK IS TURNED OFF
AND CANNOT BE INADVERTENTLY TURNED ON AND THAT THE ELECTRICITY SUPPLY IS
DISCONNECTED.
AFTER ANY MAINTENANCE TASK, CHECK THE APPLIANCE TO ENSURE THAT IT PERFORMS
CORRECTLY AND CARRY OUT ANY NECESSARY ADJUSTMENTS AS DETAILED IN SECTION 1.
ALWAYS CHECK FOR GAS SOUNDNESS AFTER CARRYING OUT ANY SERVICING OR EXCHANGE
OF GAS CARRYING COMPONENTS.
NOTE: When replacing wiring connections refer to the wiring diagram contained on the unit and within
this manual.
After Servicing
a) Test for gas soundness as specified in
IGE/UP1 as appropriate after any gas
connection has been disturbed.
b) Check for correct operation, as appropriate
(see commissioning of appliance).
Regular Servicing Procedures
The following must be serviced at regular
intervals.
Burners
The burner should be cleaned periodically to
maintain maximum performance. Burners are
best cleaned with a wire brush and any blocked
parts are best cleaned with a metal broach,
taking care not to damage the burner head.
The injector orifice should be cleaned with a
wooden splinter. Metal reamers may distort or
increase the orifice size and should be avoided.
Gears
The gear housing has fitting for proper
lubrication of moving parts. The gears do not run
in oil, periodic lubrication with grease is
necessary. Frequency of lubrication will depend
on operating conditions, but it should be
performed at least once every 6 months. It is
recommended that a #2 grade LGI lithium
grease be used. Add grease through the Zerk
fittings on the gear housing until grease flows out
of bearings around the trunnion shaft. Place a
liberal amount of grease on the gear to cover the
arc that is in contact with the worm gear.
Safety Valve
At least twice a month the safety valve requires
checking to make sure it works correctly. When
the gauge pressure is about five PSI, lift the
valve lever enough to vent steam, then quickly
let it snap back into place.
WARNING
AVOID ANY EXPOSURE TO THE STEAM
BLOWING OUT OF THE SAFETY VALVE.
This procedure should be explained to the user,
since it is to be carried out at least twice a
month. Safety procedures and requirements
should also be explained to the user when
carrying out the procedure.
Safety Valve Operating Instructions
If adding water to a boiler, DO NOT ALLOW
water to flow through safety valve as sediment or
debris may be deposited on seating surface.
To achieve topmost performance and maximum
service life, it is necessary to maintain a proper
pressure margin between set pressure of the
safety valve and equipment operating pressure.
10 OM/SM-DH CE
Test the operation of the safety valve on a
regular basis.
The minimum required pressure margin for this
type of valve is 10% of the safety relief valve set
pressure, but not less than five PSI. UNDER NO
CIRCUMSTANCES SHOULD THIS MARGIN
BE LESS THAN 5 PSI. Failure to maintain this
operating margin may result in water leakage
past the seat and accumulation of deposits on
the seating surface. Excessive deposits may
prevent the valve from operating properly, and a
dangerous pressure build-up and equipment
rupture may result.
Maintenance and Testing
CAUTION
BEFORE TESTING, MAKE CERTAIN
DIS C H ARGE P I PE IS PR O P ERLY
CONNECTED TO VALVE OUTLET AND
ARRANGED TO CONTAIN AND SAFELY
DISPOSE OF BOILER DISCHARGE (SEE
“INSTALLATION INSTRUCTIONS”).
Under normal operating conditions a “try lever
test” must be performed every two months.
Under severe service conditions, or if corrosion
and/or deposits are noticed within the valve
body, testing must be performed more often. A
“try lever test” must also be performed at the end
of any non-service period.
Test at or near maximum operating pressure by
holding the test lever fully open for at least 5
seconds to flush the valve seat free of sediment
and debris. Then release lever and permit the
valve to snap shut.
If lift lever does not activate, or there is no
evidence of discharge, discontinue use of
equipment immediately and contact a licensed
contractor or qualified service personnel.
Neither Conbraco Industries, Inc. nor its agents
assume any liability for valves improperly
installed or maintained.
This quality Conbraco safety relief valve, along
with proper installation, use, and maintenance,
will provide many years of reliable service and
protection against excessive pressure build-up of
water/steam. Use of this valve for any other
purpose or media places all responsibility upon
the user. Before installing valve or operating
equipment to which it is installed, read
instructions carefully. Always wear proper safety
equipment.
INSTALLATION OF SAFETY VALVE
a) Installation must be performed by qualified
service personnel only.
b) The BTU/hr or lb/hr rating of this valve must
equal or exceed that of the equipment to
which it is attached.
c) DO NOT use this valve on a coal or wood
boiler having an uncontrolled heat input.
d) Ensure that all connections, including the
valve inlet, are clean and free from any
foreign material.
e) Use pipe compound sparingly, or tape, on
external threads only.
f) DO NOT USE A PIPE WRENCH! Use
proper type and size wrench on wrench pads
only.
g) This valve must be mounted in a vertical,
upright position directly to a clean, tapped
opening in the top of the boiler or equipment.
Under no circumstances should there be a
flow restriction or valve of any type between
the safety relief valve and the pressure
vessel
h) WARNING!
During operation, this valve
may discharge large amounts of steam
and/or hot water. To reduce the potential for
bodily injury and property damage, a
discharge line MUST
be installed that:
OM/SM-DH CE 11
Loading...