Dover unified brands groen DH-20, Operator'S Manual, Page: 3 / 30

3 OM-DH(T) DOMESTIC & (CE) INTERNATIONAL
PERFORMANCE DATA (CE)
Model DH/DHT-20 DH/DHT-40 DH/DHT-60
(G20) kW 19.0 26.4 31.6
BTU/hr 64,800 89,900 107,900
(G31) kW 19.4 24.3 32.3
BTU/hr 66,200 82,700 110,300
INSPECTION & UNPACKING
CAUTION: SHIPPING STRAPS ARE UNDER TENSION AND CAN SNAP BACK WHEN CUT.
TAKE CARE TO AVOID PERSONAL INJURY OR DAMAGE TO THE UNIT BY
STAPLES LEFT IN THE WALLS OF THE CARTON.
CAUTION: THIS UNIT WEIGHS BETWEEN 535 AND 978 POUNDS (245 TO 400 KG)
DEPENDING ON SIZE. INSTALLER SHOULD USE PROPER EQUIPMENT TO
LIFT SAFELY.
The unit will arrive in a heavy shipping carton and will be bolted or banded to a
skid. Immediately upon receipt, inspect the carton carefully for exterior damage.
Carefully cut any polyester straps around the carton and detach the sides of the box
from the skid. Pull the carton up off the unit. Thoroughly inspect the unit for hidden
damage. Report any shipping damage or incorrect shipments to the delivery agent.
Write down the model number, serial number, and installation date, and retain this
information for future reference. Space for these entries is provided at the top of
the Service Log at the back of this manual. Keep this manual on file and available
for operators to use.
When installation is to begin, carefully cut any straps which hold the unit on the
skid. Lift the unit straight up off the skid. Examine packing materials to be sure
loose parts are not discarded with the materials.
INSTALLATION
DOMESTIC
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.
DANGER: ELECTRICALLY GROUND THE UNIT AT THE TERMINAL PROVIDED. FAILURE
TO GROUND UNIT COULD RESULT IN ELECTROCUTION AND DEATH.
WARNING: DO NOT CONNECT ANY PIPING TO THE PRESSURE RELIEF VALVE. THE VALVE
MUST BE FREE TO VENT STEAM AS NEEDED. IMPROPER INSTALLATION
WILL VOID THE WARRANTY! THE ELBOW ATTACHED TO THE PRESSURE
RELIEF VALVE MUST POINT TO THE FLOOR.
The open end of the pressure relief valve
elbow must face downward.
When attaching the draw-off
valve, hand-tighten the nut.
For efficient performance the DH kettle must be installed in a well-ventilated
area. Items which might restrict or obstruct the flow of air for combustion and
ventilation must be removed. The area directly around the appliance must be free
of combustible materials.
1. Installation can be on a combustible or noncombustible floor. Clearances
should be per table below.
MINIMUM
CLEARANCE FROM
COMBUSTIBLE
WALLS
MINIMUM
CLEARANCE FROM
NON-COMBUSTIBLE
WALLS
RECOMMENDED
CLEARANCES
Left Side 6 in. 0 in. 6 in.
Right
Side
6 in. 0 in. 10 in.
Rear 10 in. 10 in. 12 in.
2. The kettle should be installed in an adequately ventilated room with provision
for adequate air supply. The ventilation must employ a vent hood and exhaust
fan with no direct connection between the vent duct and the kettle flue. Do not
obstruct the flue or vent duct after installation.
3. Set the kettle in place and level it using a spirit level on the bar rim, by turning
the bullet or flange feet to adjust leg length. Allow clearance around the unit
for cleaning, maintenance and service.
4. Complete the piping to the gas service main with ½” line or approved
equivalent.
5. Provide 115 vac, 60 Hz, single phase 5 AMP electrical service. The unit may
also be ordered for alternate electric service of 208 VAC - 240 VAC. Observe
local codes and/or The National Electrical Code in accordance with ANSI/
NFPA 70 (current edition), or the Canadian Electrical Code, CSA C22.2 (current
edition), as applicable. Use the wiring diagram inside the service panel and at
the rear of this manual.
6. Bring electrical service through the entrance at the rear of the support housing
with a ½ inch conduit connector. Make a watertight connection with the
incoming lines.
7. Electrically ground the unit at the terminal provided.
8. After the kettle has been connected to the gas supply, check all gas joints for
leaks. DO NOT USE FLAME TO CHECK FOR LEAKS. A thick soap solution or
other suitable leak detector should be employed.
9. The gas supply and unit’s installation must conform with local codes or in the
absence of local codes, with the National Fuel Gas Code, ANSI Z223.1/NFPA
54 (current edition), or the Natural Gas and Propane Installation Code CSA
149.1(current edition), as applicable. Additionally following must be complied
with: THE AREA DIRECTLY AROUND THE APPLIANCE MUST BE CLEARED OF
ALL COMBUSTIBLE MATERIAL. FAILURE TO FOLLOW THESE INSTRUCTIONS
CAN CAUSE BODILY INJURY AND /OR PROPERTY DAMAGE. The appliance and
its individual shut-off valve must be disconnected from the gas supply piping
system during any testing at pressures in excess of ½ PSI (3.45 kPa). The
appliance must be isolated from the gas supply piping system by closing its
individual manual shut-off valve during any pressure testing at or less than ½
PSI (3.45 kPa).
10. Confirm that the jacket water level is between the gauge glass markers or
inside the sight glass port. If the level is low, follow instructions under “Jacket
Filling and Water Treatment,” Page 16.
11. The open end of the elbow on the outlet of the safety valve must face
downward. If it does not, turn it to the correct position.
12. For units with optional tangent draw off: Assemble the tangent draw-off by
placing the large nut over the draw-off valve and inserting it into the draw-off
tube. ONLY HAND-TIGHTEN THE NUT to complete installation.