Dover GROEN AH-20, Operator'S And Service Manual

OM/SM-AH-CE

6

1.8 Total Gas Rate

NOTE: With reference to the gas rate, pressure

Model

(G20&

(G31)

Natural

Propane

G25) KW

KW

Natural

Propane

BTU/hr

BTU/hr

AH-20

22

75,100

22

75,100

AH-40

25

85,300

22

75,100

AH-60 &

AH-80

40

136,500

40

136,500

1.9 Injector Diameters-Natural & Propane Gas  

Model

Gas G20 Gas G25 Gas G31

Natural

Natural Propane

(mm)

(mm)

(mm)

No. of

Orifices

(Injectors)

AH-20

4.39

4.70

2.64

1

AH-40

4.57

4.90

2.64

1

AH-60 &

AH-80

5.94

6.75

3.57

1

1.10

Gas Pressure Adjustment

A pressure test point is fitted on the burner
manifold and on the gas control valve.

Model

AH-20

AH-40

AH-60 &

AH-80

NATURAL
GAS G20

mbar

8.75

8.75

8.75

in. WC

3.5

3.5

3.5

NATURAL
GAS G25

mbar

8.75

8.75

7.0

in. WC

3.5

3.5

2.8

PROPANE
GAS G31

mbar

25

25

25

in. WC

10

10

10

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.

1.11 Burner Adjustment

The burner has a primary air adjustment.  The gap
should be 1/4" (6.35 mm) to 3/8" (9.53 mm).

Section 2 

Assembly and Commissioning

2.1 Assembly

2.3 

Electrical Supply

 a) Unpack the appliance.

Before commissioning the appliance, ensure that the

 b) Place on a firm, level floor. Adjust and fix

relevant regulations. (Paragraph 1.5)  

feet.

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.

2.2  Gas Supply

Connect the unit to the gas supply and test for gas
soundness.  For the part of the integral gas supply
down stream of the gas valve, leak detection
spray or some solution may be used with the
burners lit.

Caution:

 Ensure that the pan contains liquid when

the burners are alight.

electrical installation has been carried out to the

THIS APPLIANCE MUST BE EARTHED. 

2.4 

Jacket Water Level/Jacket Pressure  

 a)  Ensure the water level is correct in the jacket, by

confirming that the level is between the marks on
the gauge glass. If the water is low, follow the
instructions under "Jacket Filling" in the servicing
section of this manual.

 b)  Check the pressure gauge. If the gauge does not

show 20 or more inches of vacuum (that is, a
reading of 20 to 30 below zero) see "Jacket
Vacuum" in the servicing section of this manual.

2.5 

Pre-Commissioning Check