DeDietrich GT 224 Manual

GT 220 - GT 2200
Fuel oil/gas-fired boilers
Installation and
Service Manual
300008281-001-E
EN

2GT 220 - GT 2200 22/01/09 - 300008281-001-E
.
Declaration of conformity CE
C002209-A

3
22/01/09 - 300008281-001-E GT 220 - GT 2200
.
Contents
1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
1.1 Regulations for France . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
1.2 Regulations for other countries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2 Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2.1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2.2 Composition of the range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2.3 Homologations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2.4 Technical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2.5 Rating plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.6 Main dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
2.6.1 Boiler and tank dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
2.6.2 Installation dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
2.7 Aeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
2.7.1 If using fuel oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
2.7.2 If using gas (GT 220 fitted with a forced draught gas-fired burner) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.1 Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.2 Hydraulic connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.3 Chimney connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
3.4 Connecting the burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
3.5 Electrical connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
3.6 Filling the installation with water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
3.7 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.1 Checking and cleaning the main components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.2 Boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.3 Burner. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
4.4 Domestic hot water tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
5 Stopping the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
6 Spare parts - GT 220 - GT 2200 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Used symbols
Caution danger Risk of injury and damage to equipment. Attention must be paid to the warnings on
safety of persons and equipment
Specific information Information must be kept in mind to maintain comfort
ZReference Refer to another manual or other pages in this instruction manual

4GT 220 - GT 2200 22/01/09 - 300008281-001-E
1. General
1 General
The boiler shall be assembled and installed by a qualified
professional only. For a proper operating of the boiler,
follow carefully the instructions.
1.1 Regulations for France
Certificate of compliance
`Only concerns GT 220/2200 boilers fitted with a forced draught
gas-fired burner:
For the application of article 25 of the modified decree dated 02/08/
1977 and of article 1 of the modifed decree dated 05/02/1999, the
installation engineer must be in possession of the certificates of
compliance approved by the Ministries in charge of construction and
gas safety:
- Different forms (forms 1, 2 or 3) for a new gas installation,
- "Model 4" in particular after replacing a furnace with a new one.
Residential buildings
Statutory terms and conditions of installation and maintenance:
The installation and maintenance of the appliance must be carried
out by a qualified professional in compliance with the statutory texts
of the codes of conduct in force, particularly:
- Order of 2 August 1977
Technical and safety rules applicable to combustible gas and
liquefied hydrocarbon installations situated inside residential
buildings and their annexes.
- NF P 45-204 standards
Gas installation, (formerly DTU 61-1, gas installations: April 1982,
addendum no 1: July 1984).
- Local Sanitary Regulations
For appliances connected to the electricity network:
- NF C 15-100 standards Low voltage electrical installation - Rules..
Establishments open to the public (Statutory
terms and conditions of installation)
The installation and maintenance of the appliance must be carried
out in compliance with the statutory texts and rules of the codes of
conduct in force, particularly:
Safety regulations against fire and panic in establishments open to
the public:
• General regulations:
- For all appliances: Articles GZ - Installations operating on
combustible gases and liquefied hydrocarbons.
- Then, depending on use: Articles CH-Heating, ventilation,
refrigeration, air conditioning and production of steam and
domestic hot water.
• Instructions specific to each type of establishment open to the
public (hospitals, stores, etc.).
1.2 Regulations for other countries
The installation and maintenance of the boiler must be done by a
qualified professional in compliance with the prevailing local and
national regulations.

5
22/01/09 - 300008281-001-E GT 220 - GT 2200
2. Description
2 Description
2.1 General
Boilers in the GT 220 range have the following characteristics:
- Autonomous automatic hot water boilers
-Boiler** CE.
- Connecting to a chimney
- Boiler to be fitted with an independent burner using fuel oil or gas
-B, B2, X, or DIEMATIC 3 control panel
Boilers in the GT 2200 range have the following characteristics:
- Autonomous automatic hot water boilers
-Boiler** CE.
- Connecting to a chimney
- Boiler to be fitted with an independent burner using fuel oil or gas
-B, B2, or DIEMATIC 3 control panel
- Domestic hot water production by 160 / 250-litre tank positioned on
the floor under the boiler
2.2 Composition of the range
2.3 Homologations
`CE identification no: CE1312BR4657
`User country: This product may be sold in the member states
of the European Union as well as in Switzerland, Iceland,
Norway and Romania.
`97/23/EC Directive:
Gas and oil boilers with a maximum operating temperature of
110°C and hot water tanks with a maximum operating pressure
of 10 bar pertain to article 3.3 of the directive, and therefore,
cannot be CE-marked to certify compliance with the directive 97/
23 EC.
De Dietrich boilers and DHW tanks conform to the regulations in
article 3.3 of the 97/23/CEE Directive and is backed by the CE
mark for the 90/396/CEE, 92/42/CEE, 2006/95/EC and 2004/
108/EC directives.
GT 220/2200 B Boiler with electronic control panel.
GT 220/2200 B2 Boiler with B2 basic electronic control panel for
controlling a 2-stage burner.
GT 220/2200 D Boiler with DIEMATIC 3 electronic control panel
GT 220/2200 D + AD217 Boiler with DIEMATIC 3 control panel for
controlling a 2-stage or modulating burner.
GT 220 X Boiler with Xelectronic control panel

6GT 220 - GT 2200 22/01/09 - 300008281-001-E
2. Description
2.4 Technical characteristics
12.5 % on fuel oil and 9.5 % on natural gas
- Flow temperature: 80 °C.
- Return temperature: 60 °C.
- Maximum operating pressure: 4 bar
- Maximum operating temperature: 100 °C
- Boiler thermostat setting: 30 - 90 °C
- Setting the safety thermostat: 110 °C
Boiler type
GT 224
GT 2204
160
GT 2204
250
GT 225
GT 2205
160
GT 2205
250
GT 226 GT 227 GT 228
Nominal output Pn kW 50 50 64 64 78 92 100
Useful output range kW 40-50 40-50 50-64 50-64 64-78 78-92 92-100
Input range kW 43.2-54.5 43.2-54.5 54.0-69.7 54.0-69.7 69.7-84.8 84.2-100.1 99.6-108.9
PCI efficiency - at 100% Pn
(Average temperature: 70 °C) % 91.791.791.891.892.091.991.8
PCI efficiency - at 30% Pn
(Average temperature: 50 °C) % 93.993.993.793.793.693.894.1
PCI efficiency - at 30% Pn
(Average temperature: 40 °C) % 94.194.194.394.394.694.694.7
Fuel oil burner (Option)
1 stage M200/1S(1) M200/1S(1) M200/1S(1) M200/1S(1) M201/2S M201/2S M201/2S
1 stage M201/2N M201/2N M201/2N M201/2N
2 stages M202/2S(1) M202/2S(1) M202/2S(1)
1 stage (Belgium) M100/3S M100/3S M100/3S(2) M100/3S(2)
1 stage G200/1S G200/1S G200/1S G200/1S G200/1S(3)
Gas burner (Option) 1 stage G201/2N(4) G201/2N G201/2N
2-stage or modulating G203/2N(4) G203/2N G203/2N
Numberofcastironparts 4455678
Nominal water flow (Nominal output) ∆T = 20K m3/h 2.151 2.151 2.754 2.754 3.356 3.959 4.303
Stand-by losses ∆T = 30K W 197 197 213 213 226 238 247
Losses through the outer casing ∆T = 30K % 64646868707273
Auxiliary electrical power
( Nominal output - ex circulating pump) W 10101010101010
Watercontent litres36364343505764
Water resistance ∆ T = 15K mbar*11.011.017.817.826.536.743.4
Flue gas circuit volume litres 54 54 68 68 83 97 111
Combustion chamber
Inscribed Ø mm 309 309 309 309 309 309 309
Depth mm 446 446 573 573 700 827 954
Volume litres 33 33 42 42 51 60 69
Mass flue gas flow rate Fuel oil Kg/h 83 83 106 106 129 152 166
Gas Kg/h 91 91 117 117 143 168 183
Pressure in the furnace for nozzle pressure = 0 mbar mbar 0.2-0.5 0.2-0.5 0.3-0.6 0.3-0.6 0.3-0.8 0.4-0.8 0.6-0.9
Smoke temperature (Boiler temperature
=70 °C) °C <195 <195 <195 <195 <195 <205 <205
Weight (empty) GT 220 kg 218 218 257 257 297 336 375
GT 2200 kg 318 348 357 387 - - -
Tank capacity GT 2200 litres 160 250 160 250 - - -
Power exchanged (5) (7) GT 2200 kW 28 36 28 36
Specific flow ** (6) (7) ∆ T = 30K litres per
min. 20.5 30 20.5 30
Flow per hour ** (6) (7) ∆ T = 35K l/h 690 885 690 885
Flow in 10 minutes*** (6) (7) ∆ T = 30K litres per
10 min. 255 385 255 385
Cooling constant Cr Wh/
24h·L·K 0.26 0.23 0.26 0.23
Losses through the outer casing (DHW) ∆ T = 45K kW 78 108 78 108 690 810 690
Auxiliary electrical power (DHW) kW 80 80 80 80 255 385 255

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22/01/09 - 300008281-001-E GT 220 - GT 2200
2. Description
2.5 Rating plate
The rating plate identifies the product and provides information on:
- The date of manufacture: XX (Year) - XX (Week).
- The serial number.
(1) Except Belgium *1 mbar = 10 mmCE = 10 daPa = 100 Pa / 1 K =1 °C
(2) up to 60 kW
(3) up to 70 kW
(4) above 70 kW ** Specific flow: Minimum average rise in temperature of 30K that the appliance
can provide in the course of two successive draw-offs of 10 minutes
separated by a stop of 20 minutes.
(5) Heat exchanger inlet temperature: 80 °C
Domestic hot water temperature: 45 °C
(6) DHW setting = 60 °C - Average domestic hot water temperature:
40 °C - Boiler setting: 80 °C
*** Draw-off capacity: Hot water flow at which water can be drawn off during a
period of 10 minutes at a temperature of 30°C.
Outlet status: Water at 10°C in the boiler.
(7) Cold water temperature: 10 °C
A

8GT 220 - GT 2200 22/01/09 - 300008281-001-E
2. Description
2.6 Main dimensions
2.6.1 Boiler and tank dimensions
• GT 220
• GT 2200
(*) Boiler and DHW calorifier connection kit
A
A
GT 224 GT 2204/160
GT 2204/250 GT 225 GT 2205/160 GT 2205/250 GT 226 GT 227 GT 228
A700 700 827 827 954 1081 1208
B772 772 899 899 1026 1153 1280
Ø C153 153 153 153 180 180 180
 R1 1/4 R1 1/2 R1 1/4 R1 1/2 R1 1/2 R1 1/2 R1 1/2
E380 380 507 507 634 761 888

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22/01/09 - 300008281-001-E GT 220 - GT 2200
2. Description
1. Heating outlet
2. Heating return
3. Drainage / filling orifice
Rp 3/4
4. Flue gas nozzle ø C
5. Domestic hot water outlet - G 1
6. Domestic cold water inlet - G 1
7. Domestic hot water circulation loop return - G 3/4
8. Filling and emptying tap
(connection for 14 mm interior diameter pipe)
9. 4xM8 on Ø 150 and 4 markings on Ø 170
10. Drilling Ø 110 - Precut Ø 130
R = Thread
Rp = Exterior cylindrical threading, sealed by flat joint
(1) Adjustable feet: Basic dimension 35 mm. Can be adjusted from
35 mm to 50 mm
(2) Adjustable feet: Basic dimension 35 mm. Can be adjusted from
35 mm to 40 mm
2.6.2 Installation dimensions
Keep space free around the boiler to ensure good accessibility to the appliance.
Minimum recommended dimensions (in mm):
• GT 220 • GT 2200
Boiler A (mm)
GT 224 700
GT 225 827
GT 226 954
GT 227 1081
GT 228 1208
Boiler A (mm)
GT 2204/160 930
GT 2204/250 1306
GT 2205/160 930
GT 2205/250 1306

10 GT 220 - GT 2200 22/01/09 - 300008281-001-E
2. Description
2.7 Aeration
Position the air inlets in relation to the high ventilation vents in order
that the air is refreshed throughout the boiler room. Do not obstruct the air inlets in the room (even partially).
2.7.1 If using fuel oil
The minimum cross sections and the emplacement of the fresh air
inlet and the air discharge are governed by the order of 21/03/1968
amended by the orders of 26/02/1974 and 03/03/1976.
Generator installed in a building for collective use
(installations less than 70 kW)
`The fresh air inlet must:
- Come out in the lower section of the premises,
- Have a free minimum cross section calculated on the basis of 0.03
dm² per kilowatt installed output and at least equal to 2.5 dm².
`The air discharge must:
- Be located in the upper section of the premises,
- Rise above the roof (unless using an equivalent system which
does not cause a nuisance to neighbours),
- Have a free cross section (corresponding to 2/3 of that of the air
inlet and at least equal to 2.5 dm²).
Generator installed in a builing for individual use
`An adequate supply of fresh air must be provided as close as
possible to the appliances. Its cross section must be at least 0.5
dm².
`In the upper section of the premises, an air outlet must ensure
effective ventilation.
Establishments open to the public
`New establishment: Refer to the order of 25/06/1980
(installations of more than 20 kW and less than or equal to 70
kW).
`Existing establishment: Refer to the order of 25/06/1980
(installations less than 70 kW).
2.7.2 If using gas (GT 220 fitted with a forced draught gas-fired burner)
France: the cross section of the aeration vent, which is compulsory
in the boiler room in which the boiler is installed, must comply with the
DTU 61.1 (P 45 204) standard and, in particular, with the instruction
on boiler room layout (Book 1764 April 1982)
Belgium:the cross-section of the aeration vents, which are
compulsory in the room in which the boiler is installed, must comply
with the NBN D 51.003 standard
Germany: the cross section of the ventiliation vents, which are
compulsory in the room in which the boiler is installed, must comply
with the VDI 2050 form 1 standard and with other prevailing
regulations.
Other countries: the cross section of the aeration inlet, which is
compulsory in the premises in which the boiler is installed, must
comply with the standards in force in the country.
Caution:
In order to avoid damage to the boiler, it is necessary to prevent the
contamination of combustion air by chlorine and/or fluoride
compounds, which are particularly corrosive. These compounds are
present, for example, in aerosol sprays, paints, solvents, cleaning
products, washing products, detergents, glues, snow clearing salts,
etc. Therefore:
- Do not suck in air evacuated from premises using such products:
hairdressing salons, dry cleaners, industrial premises (solvents),
premises containing refrigeration systems (risk of refrigerant
leakage), etc.
- Do not stock such products close to the boilers.
If the boiler and/or peripheral equipment are corroded by such
chloride or fluoride compounds, the contractual guarantee
cannot be applied.

11
22/01/09 - 300008281-001-E GT 220 - GT 2200
3. Installation
3 Installation
3.1 Mounting
ZSee: Boiler installation instructions.
3.2 Hydraulic connections
Installation must be carried out in accordance with the prevailing
regulations, the codes of practice and the recommendations in these
instructions.
for GT 2200: Before making the connection to the heating
installation, carry out the assembly and connection
between the boiler and the DHW tank.
ZSee: Boiler installation instructions.
3.2.1 Important recommendations for connecting the boiler to the heating circuit
There must be no total or partial closing mechanism
between the boiler and the safety valves (France: DTU -
65.11, § 4.22 - NF P 52-203).
Heating installations must be designed and implemented
to prevent heating circuit water and products contained in
it returning to the drinking water system (article 16-7
Departmental Health Regulations). A CB disconnector
(area disconnector for different uncontrollable
pressures)must be installed for filling the heating circuit
according to the NF P 43-011 standard.
Before making the water connections of the heating circuit and
domestic hot water tank heat exchanger, it is imperative to rinse the
circuits to remove any particles which might damage the components
(safety valve, pumps, valves, ...).
When using installations with thermostatic protection,
only safety valves marked "H" may be connected, and only
to the boiler outlet safety measurement tap; their drainage
capacity must correspond to the boiler's maximum
nominal useful output (Germany: DIN 4751 form 2).
3.2.2 Hydraulic connection of the water circuit for domestic use
ZSee: Domestic hot water calorifier instructions.

12 GT 220 - GT 2200 22/01/09 - 300008281-001-E
3. Installation
3.2.3 Typical systems
The following diagrams are given by way of an example. Other connections may be made.
Key to the diagrams
1Heating outlet
2Heating return
33-bar safety valve
4Pressure gauge
7Automatic air vent
9Valve
10 3-way mixing valve
11 Heating pump
16 Expansion vessel
17 Draining valve
18 Filling the heating circuit
21 Exterior temperature sensor
No sensor with panel B/B2/X
Delivered as standard with panel D
22 Boiler control sensor
23 Mixing valve outlet temperature sensor
24 DHW tank heat exchanger primary inlet
25 DHW tank heat exchanger primary outlet
26 DHW load pump
27 one-way valve
28 Domestic cold water inlet
29 Pressure reducer
30 Sealed safety unit calibrated to 7 bar
31 Independent domestic hot water tanks
32 Domestic hot water loop pump (optional)
33 Domestic hot water temperature sensor (Option)
44 Thermostat limiting the temperature to 65°C with manual reset for
underfloor heating (France: DTU 65.8, NF P 52-303-1)
50 Disconnector
51 Thermostatic valve
52 Differential valve
56 DHW circulation loop return
57 Domestic hot water outlet
65 Low temperature circuit (radiators or underfloor heating)
75 Pump for DHW use

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22/01/09 - 300008281-001-E GT 220 - GT 2200
3. Installation
Installation with 1 direct radiator heating circuit (without mixing valve)
Control panels possible for this type of installation:
• 1-stage burner:
- Control panel B
- Control panel D (DIEMATIC 3) ,
• 2-stage burner - Modulating burner:
- Control panel B2 - (2 stages)
- Control panel
D (DIEMATIC 3) + PCB 2-stage burner / modulating
burner / 3-way valve - Package AD217.
Panel B/B2 is fitted as standard to control a second direct circuit
(Room temperature thermostats optional).
B
Control panel B/B2
Control panel D (DIEMATIC 3)
1-stage burner: Control panel delivered as standard (without optional
equipment)
or
2-stage burner - Modulating burner: Control panel D (DIEMATIC 3)
+
Package AD217

14 GT 220 - GT 2200 22/01/09 - 300008281-001-E
3. Installation
Installation with 1 direct heating circuit (radiator) and 1 circuit with mixing valve (radiators or underfloor
heating)
• 1-stage burner:
This type of installation must be controlled by the Diematic 3 panel plus the "mixing valve PCB" option (Package FM 48)
• 2-stage burner - Modulating burner:
This type of installation must be controlled by the following items:
- Control panel D (DIEMATIC 3),
- PCB 2-stage burner / modulating burner / 3-way valve - Package AD217
- Outlet sensor after 3-way valve - Package AD199
Circuit Amay not be present.
Control panel delivered as standard 1-stage burner: 1 PCB option with outlet sensor FM 48
or
2-stage burner / Modulating burner:
PCB 2-stage burner / modulating burner / 3-way valve - Package AD217 + Outlet
sensor after 3-way valve - Package AD199
* 1-stage burner: Circuit B
2-stage burner / Modulating burner: Circuit C

15
22/01/09 - 300008281-001-E GT 220 - GT 2200
3. Installation
Installation with 1 swimming pool heating circuit and 1 circuit with mixing valve (radiators or underfloor
heating)
• 1-stage burner:
This type of installation must be controlled by the Diematic 3 panel plus two "DHW sensor" options (package AD 212) and the "mixing valve
PCB + sensor" option (Package FM 48)
• 2-stage burner - Modulating burner:
This type of installation must be controlled by the following items:
- Control panel D (DIEMATIC 3) ,
- PCB 2-stage burner / modulating burner / 3-way valve - Package AD217
- Outlet sensor after 3-way valve - Package AD199
- 2 DHW sensor options- Package AD212
Control panel delivered
as standard
DHW sensor
- Package AD212
DHW sensor
- Package AD212
1-stage burner: 1 PCB option with outlet sensor FM 48
or
2-stage burner / Modulating burner:
PCB 2-stage burner / modulating burner / 3-way valve - (Package AD217)
+ Outlet sensor after 3-way valve - (Package AD199)
* 1-stage burner: Circuit B
2-stage burner / Modulating burner: Circuit C

16 GT 220 - GT 2200 22/01/09 - 300008281-001-E
3. Installation
Heating installation with 1 direct heating circuit (radiator) and 2 circuits with mixing valve (radiators or
underfloor heating)
• 1-stage burner:
This type of installation must be controlled by the Diematic 3 panel plus the two "mixing valve PCB + sensor" options (package FM 48) and
the "DHW sensor" option (package AD 212).
• 2-stage burner - Modulating burner:
This type of installation must be controlled by the following items:
- Control panel D (DIEMATIC 3) ,
- PCB 2-stage burner / modulating burner / 3-way valve - Package AD217
- Outlet sensor after 3-way valve - Package AD199
- 1 "PCB mixing valve" + outlet sensor option - Package FM48
- 1 DHW sensor option - Package AD212
Control panel delivered
as standard
1-stage burner: 2 PCBs with outlet sensor FM 48
or
2-stage burner / Modulating burner:
PCB 2-stage burner / modulating burner / 3-way valve (Package AD217)
+ Outlet sensor after 3-way valve (Package AD199)
+ 1 "PCB mixing valve" + outlet sensor option (Package FM48)
.
DHW sensor
- Package AD212

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22/01/09 - 300008281-001-E GT 220 - GT 2200
3. Installation
3.3 Chimney connection
Connection must comply with the prevailing local and national
regulations.
The high-performance features of modern boilers and their use in
specific conditions as a result of the advance in burner technology
(e.g. first-stage or low modulation range operation) lead to very low
flue gas temperatures.
For this reason:
- Use flue gas pipes designed to enable the flow of condensates
which may result from such operating modes in order to prevent
damage to the chimney.
- Install a draining tee at the bottom of the chimney.
- Install a draught moderator (recommended).
3.3.1 Flue size
The following table indicates per boiler model the minimum chimney
dimensions to be respected to ensure the draught required at the
nozzle.
* 1 Pa = 0.01 mbar
(1): Maximum boiler output
(2): Boiler temperature: 80 °C (Ambient temperature: 20 °C)
3.3.2 Connection to the flue gas pipe
The appliance must be installed in accordance with the Codes of
Practice using a leak proof pipe made of a material capable of
withstanding hot combustion gases and any acidic condensation.
The connection between the boiler nozzle and the chimney flue, with
a cross section equal to that of the nozzle, must be as direct and as
short as possible.
Boiler type Output
Mass flue gas flow rate
(1) (2) (13% CO2on fuel
oil)
Smoke temperature (1)
(2) (13% CO2on fuel
oil)
Chimney: Minimum
recommended
dimensions
Min Ø Height
kW Kg/h °C mm m
GT 224 40-50 83 < 195 150 5
GT 225 50-64 106 < 195 150 5
GT 226 64-78 129 < 195 180 5
GT 227 78-92 152 < 205 180 5
GT 228 92-100 166 < 205 180 5
Boiler type Smoke nozzle Ø A
GT 224 - GT 225
Ø153
GT 226 - GT 227 - GT 228
Ø180
A

18 GT 220 - GT 2200 22/01/09 - 300008281-001-E
3. Installation
3.4 Connecting the burner
3.4.1 Dimensions for fitting the burner
B= Drilling Ø 110, Precut Ø 130.
C= 4 x M8 on Ø 150, 4 markings on Ø 170.
3.4.2 Burner location
The position of the burner head in relation to the door
insulation must be respected. The correct position is
guaranteed with De Dietrich burners.
ZSee: Burner instructions.
3.4.3 Connection, adjustment, commissioning and maintenance
ZSee: Burner instructions.
3.5 Electrical connections
ZSee: Control panel instructions.
1
Ø 305
110 8227N013A

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22/01/09 - 300008281-001-E GT 220 - GT 2200
3. Installation
3.6 Filling the installation with water
3.7 Commissioning
ZSee:
- Control panel instructions,
- Burner instructions,
- Domestic hot water calorifier instructions (L160, L250).
The filling, bleeding and leak tightness checks for the DHW
(if needed) and heating circuits must be done in
compliance with the DHW tank and boiler instructions.
Heating circuit GT 220 - GT 2200
Fill slowly via the low point on the heating installation:
- Either via the filling and draining valve (see drawing above). In
this case, the pipe (internal Ø 14 mm) must be disconnected
after filling.
- Or via the disconnector put in place by the fitter (see mark 50
principle diagrams above).
The installation is bled of air from the top by opening one or more
bleed valves. Close the bleed valve(s) when water comes out.
Check that connectors are leak tight.
DHW tank exchanger GT 2200
For the bleeding of the DHW tank exchanger to be done correctly,
proceed as follows:
`Unsrew the automatic air vent plug.
`Turn the anti-thermosiphon valve to open (O).
These elements will be put back into their initial position once the
boiler has been commissioned.
Check the operation of the heating safety valve.

20 GT 220 - GT 2200 22/01/09 - 300008281-001-E
4. Maintenance
4 Maintenance
4.1 Checking and cleaning the main components
4.1.1 Water level
Regularly check the level of water in the installation. Top it up, if need
be, avoiding the abrupt input of cold water into the hot boiler. If this
operation is repeated several times per season, locate the leak and
repair it.
Do not drain the installation, except in cases of absolute
necessity. For example: Several months' absence with the
risk of ice in the building.
4.1.2 Safety devices
Check that the safety devices are operating correctly (particularly the
heating circuit valve).
4.2 Boiler
The boiler will only operate efficiently if the exchange surfaces are
kept clean.
The boiler must be cleaned as often as necessary and, like the
chimney, at least once a year or more in accordance with the
prevailing regulations and the insurance contract taken out.
Cleaning operations are always done with the boiler and
the electricity supply switched off.
To access the various parts to be serviced and checked, it is
necessary to remove the front panel/cover of the boiler. See drawing
opposite.
Cleaning operations: See following pages.
After cleaning and servicing:
- Close the door of the combustion chamber.
- Service the burner.
- Replace the front cover.
- Carry out tests to ensure correct operation and make combustion
measurements.
A