DeDietrich GT 300 A User manual

GT 300 A/II
Oil-Gas Fired Hot Water boiler English
03/14/08
94863873
Installation and operating instructions
Warning:
Before putting the boiler into operation read this manual
carefully.
Warning:
The operating manual is part of the documentation that is
delivered to the installation’s operator. Go through the
information in this manual with the owner/operator and
make sure that he or she is familiar with all the necessary
operating instructions.
Notice:
This manual must be retained for future reference. Improper
installation, adjustment, alteration, service or maintenance can
cause injury, loss of life or property damage. Refer to this
manual. For assistance or additional information consult a
qualified installer, service agency or the gas supplier.
Please Read & Save
these instructions for
Future Reference

Guideline of Notices
Warning:
indicates presence of hazards that can cause, if not
avoided, severe personal injury, death or substantial
property damage.
! Caution:
indicates presence of hazards that will or can cause, if not
avoided, minor personal injury or property damage.
Notice:
Application comment for optimum use of equipment and
adjustment as well as useful information.
ZReference to an other instruction book.
Observe the following symbols
DANGER
due to explosion of gas.
- Work only on gas components when you have a license to do so.
- Note that the assembly of gas and vent connections, the initial
start-up, the electrical connections, the maintenance and service
can only be performed by a licensed service contractor or
technician.
DANGER
due to electricity.
- Prior to doing any work on the heating system, disconnect all
electrical power to the boiler at the emergency switch.
- It is NOT sufficient to shut off only the boiler control!
! CAUTION!
SYSTEM DAMAGE
due to improper installation.
- Observe local and state codes as well as common industry
practices during the installation and operation of the heating
appliance.
! CAUTION!
SYSTEM DAMAGE
due to inadequate cleaning and maintenance.
- Aboilercleaningandmaintenanceshouldbeperformed annually.
Verify complete system operation at the same time.
- Correct the problem immediately to prevent damage to the
system!
Safety Considerations
Please observe the following safety instructions.
Read this manual carefully.
Correct installation and adjustment of the burner and the control
panel is a precondition for safe, efficient operation of the gas boiler.
Read this manual and the specifications on the safety label carefully
before attempting to put the burner into operation.
Do not store or use gasoline or other flammable liquids in
the vicinity of this or any other appliance.
Installation and service must be peformed by a qualified
installer, service agency or the gas supplier.
WHAT TO DO IF YOU SMELL GAS:
- Do not try to light any appliance.
- Do not touch any electric switch, do not use any phone in
your building.
- Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
- If you cannot reach your gas supplier, call the Fire
Department.
Warning:
Improper installation, adjustment, and/or operation could
cause carbon monoxide poisoning resulting in injury or
death.
This product must be installed and serviced by a
professional service technician who is experienced and
qualified in hot water boiler installation and gas
combustion.
! Caution: Strict compliance with these instructions is a
precondition for the correct operation of the boiler.
! IMPORTANT
Service on this boiler should beundertakenonlyby trained and
skilled personnel.
Keep boiler area clear and free from combustible materials,
gasoline and other flammable vapors and liquids.
Do not place any obstruction in the boiler room that will hinder
the flow of combustion and ventilating air.
Read these instructions carefully before proceeding with the
installation of boiler. Post instructions near boiler for reference
by owner and serviceman.
Maintain instructions in legible condition.
2GT 300 A/II 06/10/06 - 94863873 - 85534150E
"All installations of this appliance must be be in accordance to all national and local codes and
authorities having jurisdiction"
[Canadian Installation] CSA B139 for Oil & CSA B149 for Gas
[USA Installations] NFPA 54/ANSI Z223.1 for Gas & NFPA 31 for Oil
This boiler must be connected to a venting that will safely and effectively discharge all flue
gases to the outside in an effective manner.
Never burner garbage or paper in the unit, and never leave combustible materials around it.
Do not use gasoline, crankcase draining, or any other oil containing gasoline

Contents
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Regulations and guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Installation codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
1 Uncrating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2 Packing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
3 Technical specifications of boilers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
4 Main Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Boiler Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
1 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2 Ventilation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
3 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
1 Dimensional information required. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
2 Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
3 Filling . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
4 Ancillaries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Combustion and ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
1 Clearances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
2 Replacement procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3 Dimensional information required for connection of the boiler. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Oil or gas connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
1 Specific technical information supplied with the burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Electrical. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
1 Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . .13
2 Wiring procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3 Wiring boiler panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Start up procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
1 Start up procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
2 Shut-down procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
1 Boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Service and maintenance schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Spare parts - GT 300 A/II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
3
06/10/06 - 94863873 - 85534150E GT 300 A/II

Regulations and guidelines
Theinstallationandoperating instructions shown herearegivenasa
guide for installation and operation and are not meant to replace any
State or Local Codes that may apply to the individual installation.
Good engineering practice should be used. Any deviation from laws
or regulations or industry Code or these instructions will void the
boiler warranty and any other responsability or liability of the De
Dietrich Thermiques S.A.
Installation codes
• THE BOILER SHALL BE ASSEMBLED AND INSTALLED BY A
QUALIFIEDPROFESSIONAL ONLY. STRICTCOMPLIANCEWITH
THESE INSTALLATION AND OPERATING INSTRUCTIONS IS A
PRECONDITION FOR THE CORRECTANDGUARANTEE OF THE
BOILER.
• THE INSTALLATION MUST CONFORM TO THE
REQUIREMENTS OF THE AUTHORITY HAVING JURISTRICTION
OR,INTHEABSENCE OF SUCH REQUIREMENTS, TO THE CAN/
CGA B-149 FUEL GAS INSTALLATION CODES AND CSA B-139
OIL INSTALLATION CODES.
• WHERE REQUIRED BY THE AUTHORITY HAVING
JURISTRICTION, THE INSTALLATION MUST CONFORM TO THE
STANDARD FOR CONTROLS AND SAFETY DEVICES FOR
AUTOMATICALLY FIRED BOILERS ANSI/ASME CSD-1.
• THE INSTALLATION OF THE RELIEF VALVE SHALL BE
CONSISTENT WITH ANSI/ASME BOILER PRESSURE VESSEL
CODE, SECTION IV CSA B51.
• THE BOILER MUST NOT BE INSTALLED ON CARPETING.
• IF AN EXTERNAL ELECTRICAL SOURCE IS UTILIZED, THE
BOILER WHEN INSTALLED, MUST BE ELECTRICALLY BONDED
TO GROUND IN ACCORDANCE WITH THE REQUIREMENTS OF
THE AUTHORITY HAVING JURISTRICTION OR, IN THE
ABSENCE OF SUCH REQUIREMENTS, WITH THE CANADIAN
ELECTRICAL CODE PART 1, CSA C22.1, ELECTRICAL CODE.
LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN
SERVICING CONTROLS. WIRING CAN CAUSE IMPROPER
OPERATION AFTER SERVICINGS. “VERIFY PROPER
OPERATION AFTER SERVICE”.
General
The GT300 A/II are series of oil or gas fired, cast iron, automatic
boilers.
1 Uncrating
Upon arrival, check shipment to ensure all parts have been shipped.
Inspect all items for delivery damage. Report all damage and
shortages to the delivery carrier. Report any damage and shortages
to the Distributor.
2 Packing
See the separate assembly instruction book.
For the optional equipment you may use with this boiler, see the
current price list.
4GT 300 A/II 06/10/06 - 94863873 - 85534150E
Only a qualified and licenced heating professional is to carry out the
removal, installation, startup and maintenance of this boiler. The boiler must
be installed according to all national and local codes having jurisdiction. The
operation of the boiler must be verified and all safety controls checked. Any
defect or abnormal operations must be corrected immediately. The entire
system requires annual service and cleaning at least once a year.

Unit GT 304 A/II GT 305 A/II GT 306 A/II GT 307 A/II GT 308 A/II GT 309 A/II
MBH 404 598 808 1,024 1,226 1,442
kW 118 175 237 300 359 423
US GPH 2.80 4.15 5.60 7.10 8.50 10.00
MBH 343 509 686 870 1,042 1,226
kW 100.6 149.1 201.2 255.1 305.3 359.2
MBH 298 442 597 757 906 1,066
#456789
# 6 10 10 10 12 12
US Gal 25.37 30.65 35.94 41.22 46.51 51.80
Liter 96 116 136 156 176 196
18° F Ft. H2O0.368 0.60221 1.0371 1.539 2.275 3.5129
27° F Ft. H2O0.1539 0.24758 0.47508 0.6524 1.007 1.539
36° F Ft. H2O0.0869 0.1405 0.26765 0.36802 0.56876 0.86986
Inch
mm
Inch 24.45 30.75 37.05 43.35 49.65 54.96
mm 621 781 941 1,101 1,261 1,396
Ft33.39 4.31 5.23 6.14 7.06 7.98
m30.096 0.122 0.148 0.174 0.2 0.226
PSI
MBH 343 509 686 870 1,042 1,226
V/P/H
° F
° C
° F
° C
Inch w.c. 0.80 0.16 0.28 0.48 0.72 0.88
mbar 0.2 0.4 0.7 1.2 1.8 2.2
#
Inch 777888
lb 1,124 1,340 1,530 1,744 1,953 2,154
kg 510 608 694 791 886 977
• CSA - MBH Output based on Thermal Efficiency Test According to ANSI Z21.13a/CSA 4.9a-2005
• All Models Certified for 0 - 2,000 feet ASL installation altitude, consult factory for higher altitudes
• [NET] MBH Output Factor 1.15, Allowance for Piping and Pickup Losses
• Chamber Resistance Based on Neutral Chimney-Vent Pressure
•Gas Vent Category Based on Several Factors [CO2content, Vent Pressure & Net-Flue Gas Temp]
• Approved for Direct-Vent, Use Only Approved Venting as Listed
• Natural Draft Applications, Approved for Type L vent [Gas-Oil] or Type B Vent [Gas Only]
• Conversion Btu to kW = 3,412 Btu per kW
• All Models are Design Certified & Eligible to Bear Approval Marking as Shown.
• All Models Certified to Fire; # 2 oil, Natural & Propane Gases. Consult factory for Available Burners.
• All Models Comply and Certified in Accordance to the latest Canadian & US standards
• To Obtain Current IBR Ratings, consult their publications and website.
Note:
Due to ongoing and continuous product improvements, Flexible Eutectic Sales Ltd. Reserves all rights to amend and delete information provided on this product specification table.
Gas-Vent Category
Boiler Vent Connection
Weight [Dry]
I, II - III or IV
Chamber Resistance
Water Operating
Temperature Range
FA 122 Panel
Max. Water Temp.
Safety Limit [MR]
Electrical Connection
ASME IV Rating Class 30 - (81 PSI) [See Canadian Provincial CRN approvals]
120
104 - 185
40 - 85
120/1/60
248
14.84
Cast Iron Sections
Flue-way baffles
Water Capacity
Combustion
Chamber
Dimensions Depth
Volume
377
[CSA] - Output [Gas-Oil]
Water
Resistance
[∆T = °F]
Diameter
[equivalent]
Min. Safety Relief Capacity
MAWP [Water]
[NET] - Output [Gas-Oil]
[CSA] - Gas Input
[CSA] - # 2 Fuel Oil Input
Firing Sequence
Item Model
Consult Burner Technical Data
5
06/10/06 - 94863873 - 85534150E GT 300 A/II
GT 300 A/II Technical Specification Table

4 Main Dimensions
GT 300 A/II
AWater flow tapping 2 1/2" NPSC
B Water return 2 1/2" NPSC
C Drain 1 1/2" FPT
D Rp 2 1/2 diameter sludge removal hole
Notes:
- Dimension are for gas burner only
- Oil and combination oil/gas, refer to burner manufacturer
specifications
A
C
B
D
A
Type of boiler GT 304 A/II GT 305 A/II GT 306 A/II GT 307 A/II GT 308 A/II GT 309 A/II
L385/8" 4459/64" 517/32 5733/64" 6313/16" 707/64"
P199/32 2519/32" 317/8 383/16" 4431/64" 5025/32"
ØR7" 7" 7" 8" 8" 8"
G50_0001
X
Dimension "X" Max. Burner Length (inches)
Boiler Model Riello Weishaupt Power Flame Fuel Master Gordon Piatt
GT304 A/II 10
19 221/4
191/4 26
GT305 A/II
GT306 A/II
2615/32
GT307 A/II
GT308 A/II 23 251/8
GT309 A/II
6GT 300 A/II 06/10/06 - 94863873 - 85534150E

Boiler Installation
1Installation
The GT 300 A/II boiler has a base frame, although a housekeeping
pad is recommended to keep steel parts out of casual water. Its
furnaceisclosed,so it is not necessarytoplaceitonafireproof floor,
but the floor must be able to bear the weight.
Dimension 'X', consult burner info. additional 24 inches for servicing
Caution : note addtional space required when the burner door is open.
Multiple installation of several boilers side by side, these dimensions
need to be modified.
2Combustion Air Supply
Boilers operating in atmospheres that contain fluorides or chlorides
such as beauty shops and automotive repair garages where air
conditioning services are performed or industrial applications that
may have corrosive elements in the air must have a clean source of
combustion and ventilation air. Boiler damage by contaminants will
voidthewarrantyandanyotherresponsibilityorliabilityofDeDietrich
Thermique/FES Ltd.
Warning: Ensure boiler room is adequately ventilated and
clear and free from combustible materials, gasoline and
other flammable vapours and liquids.
8553N138
46"
59/64
4"
1/8
40"
X
L
20" 31"
11/32
20"
Boiler type L
GT 304 A/II 33"
GT 305 A/II 395/16"
GT 306 A/II 459/16"
GT 307 A/II 517/8"
GT 308 A/II 583/16"
GT 309 A/II 641/2"
7
Combustion air supply must be provided according to
national and local codes:
CSA B149.1 -.2 & CSA B139
ANSI Z223.1 & NFPA 31
Illustration above showing minimum distances to combustible
materials and servicing.
Boiler must not be installed on combustible material or on carpet.

4 Main Dimensions
GT 300 A/II
AWater flow tapping 2 1/2" NPSC
B Water return 2 1/2" NPSC
C Drain 1 1/2" FPT
D Rp 2 1/2 diameter sludge removal hole
Notes:
- Dimension are for gas burner only
- Oil and combination oil/gas, refer to burner manufacturer
specifications
A
C
B
D
A
Type of boiler GT 304 A/II GT 305 A/II GT 306 A/II GT 307 A/II GT 308 A/II GT 309 A/II
L385/8" 4459/64" 517/32 5733/64" 6313/16" 707/64"
P199/32 2519/32" 317/8 383/16" 4431/64" 5025/32"
ØR7" 7" 7" 8" 8" 8"
G50_0001
X
Dimension "X" Max. Burner Length (inches)
Boiler Model Riello Weishaupt Power Flame Fuel Master Gordon Piatt
GT304 A/II 10
19 221/4
191/4 26
GT305 A/II
GT306 A/II
2615/32
GT307 A/II
GT308 A/II 23 251/8
GT309 A/II
8GT 300 A/II 06/10/06 - 94863873 - 85534150E

5. Boiler Venting & Chimney General
Caution & Warning:
It is advised and recommended that the heating contractor-professional apply vent materials that are approved and agency listed.
Installation of any venting must follow all local codes in conjunction with vent manufacturer instructions and appliance manufacturer
instructions.
All De Dietrich GT series oil-gas fired cast iron boilers are high performance boilers that could operate under all 4 vent
categories as established by ANSI Z21.13/CSA 4.9 Standard. To assist with application where the vent category is
unknown a graph below has been provided to assist you in determining the vent category and what venting materials
would be acceptable. Although the gas vent categories were developed specifically for gas fired appliances, using this
information is helpful for oil fired boilers. It is very important the venting be selected according to the conditions that the
boiler will operate under, minimum and maximum firing conditions of the boiler must be respected. The venting installed
must comply and be certified to all applicable codes and standards for each jurisdiction.
Gas-Vent Category [4] Definitions:
Cat. I
A Boiler, which operates with a non-positive vent (breech) pressure
and flue gas temperatures which avoids excessive condensation
production in the chamber and venting.
Cat. II
A Boiler, which operates with a non-positive vent (breech) pressure
and flue gas temperatures produce condensation production in the
chamber and venting.
Cat. III
A Boiler, which operates with a positive vent (breech) pressure and
flue gas temperatures which avoids excessive condensation
production in the chamber and venting.
Cat. IV
A Boiler, which operates with a positive vent (breech) pressure and
flue gas temperatures produces condensation production in the
chamber and venting.
Chart A
Gas-Fired Appliance Vent Categorization
[According to ANSI Z21.13/CSA 4.9 Gas Boiler Standard]
60
104
148
192
236
280
324
368
412
456
500
Chimney-Vent Pressure
[Inches w.c.]
Chimney-Vent Flue Gas Temperature °F
(Net, Minus Room Temperature)
15
40
64
89
113
138
162
187
211
236
260
6 7 8 9 10 11 12 11 10 9 8 7 6
Carbon Dioxide [CO
2
] Content %
Chimney-Vent Flue Gas Temperature °C
(Net, Minus Room Temperature)
Category I
Typical Vent Types [A,B,C & L] Category III
Typical Vent Types
[BH, AL294C®, 304-316L SS]
Positive
Negative
Category II
Typical Vent Types
[BH, AL294C®, 304-316L SS]
Category IV
Typical Vent Types
[BH, AL294C®, 304-316L SS]
Chart created by Craig Holdforth
9
Venting
.

5.1 Boiler Venting – Category I & II Typical Layouts and Requirements.
Caution & Warning:
Improperly sealed venting system could result in carbon monoxide [CO] poisoning; ensure adequate
support and fastening of the system. Ensure venting can safely exhaust all flue gases outside in an effective manner.
These systems must operate under a negative vent pressure condition that is stable.
Warning & Cautions for Co-Venting:
Co-venting with other appliances shall conform latest ANSI Z223.1 & CAN/CGA 149 installation codes, any
improper operation shall be corrected, the common venting shall be sized according to the appropriate tables in Part II of
the above mentioned codes.
Category I Vent Systems Requirements:
1. Flue gas temperatures above the green line shown in chart A.
2. Approved type of venting for category I appliances.
3. A barometric draft control maybe employed as required, but is not necessary for correct boiler operation. Consult
a chimney-vent specialist for correct application and usage.
4. Breeching and chimney vent sized in accordance to local and national codes or by good engineering methods.
5. Vent safety device equipped on the venting or as equipped on burner.
6. Condensate TEE fitting supplied on the boiler breeching as close as possible and be orientated to avoid
accumulation of flue gas condensation in the boiler or venting is also used to determine flue gas emissions.
Category II Vent Systems Requirements:
1. Flue gas temperatures below the green line shown in chart A.
2. Approved type of venting for category II appliances.
3. A barometric draft control maybe employed as required, but is not necessary for correct boiler operation. Consult
a chimney-vent specialist for correct application and usage.
4. Breeching and chimney vent sized in accordance to local and national codes or by good engineering methods.
5. Vent safety device equipped on the venting or as equipped on burner.
6. Condensate TEE fitting supplied on the boiler breeching as close as possible and be orientated to avoid
accumulation of flue gas condensation in the boiler or venting is also used to determine flue gas emissions.
Lined Masonry Chimney
Caution-Warning:
Flue gas condensation is very aggressive and corrosive which could lead to failure of the venting system or drains, consult local and national codes
regarding flue gas condensation disposal. The P-trap assembly must be properly filled with water to avoid escape of flue gas emissions. The flue gas
condensation may require neutralization prior to entering the drain.
10 GT 300 A/II 06/10/06 - 94863873 - 85534150E

5.2 Boiler Venting – Category III & IV Vent Systems Typical Layouts and Requirements.
Caution & Warning:
Improperly sealed venting system could result in carbon monoxide [CO] poisoning; ensure adequate
support and fastening of the system. Ensure venting can safely exhaust all flue gases outside in an effective manner.
These systems must operate under a positive vent pressure condition that is stable.
Warning & Cautions for Co-Venting:
Co-venting with other appliances shall conform latest ANSI Z223.1 & CAN/CGA 149 installation codes, any
improper operation shall be corrected, the common venting shall be sized according to the appropriate tables in Part II of
the above mentioned codes.
Category III Vent Systems Requirements:
1. Flue gas temperatures above the green line shown in chart A.
2. Approved type of venting for category III appliances
3. Breeching and chimney diameter sized in accordance to national & local codes or by good engineering methods.
4. Vent safety device equipped on burner [MR]
5. Condensate TEE fitting supplied on the boiler breeching as close as possible and be orientated to avoid
accumulation of flue gas condensation in the boiler or venting.
Category IV Vent Systems Requirements:
1. Flue gas temperatures below the green line shown in chart A.
2. Approved type of venting for category IV appliances
3. Breeching and chimney diameter sized in accordance to national & local codes or by good engineering methods.
4. Vent safety device equipped on burner [MR]
5. Condensate TEE fitting supplied on the boiler breeching as close as possible and be orientated to avoid
accumulation of flue gas condensation in the boiler or venting.
Caution-Warning:
Flue gas condensation is very aggressive and corrosive which could lead to failure of the venting system or drains, consult local and national codes
regarding flue gas condensation disposal. The P-trap assembly must be properly filled with water to avoid escape of flue gas emissions. The flue gas
condensation may require neutralization prior to entering the drain.
11
06/10/06 - 94863873 - 85534150E GT 300 A/II

5.3 Boiler Venting – Side-Wall or Direct Vent Systems Typical Layouts and Requirements.
Caution & Warning:
Improperly sealed venting system could result in carbon monoxide [CO] poisoning; ensure adequate support
and fastening of the system. Ensure venting can safely exhaust all flue gases outside in an effective manner. These
systems must operate under a positive vent pressure condition that is stable. Do not Co-Vent with any other appliance,
the venting system was designed for single appliance venting only.
Side-wall & Direct Vent Systems:
These systems do not fall under any of the gas vent categories, these systems are pre-engineered. These applications of
this venting system must be followed exactly, for safe, efficient and trouble free operation.
System Requirements:
1. Venting sized accordance to direct vent table
2. Type “BH” [AL294C®] vent material
3. Condensate TEE fitting supplied on the boiler breeching as close as possible and be orientated to avoid
accumulation of flue gas condensation in the boiler or venting is also used for determining flue gas emissions.
4. Vent termination TEE
5. Vent safety device equipped on burner [MR]
Vent Termination Locations & Warning – See Section 5.5
Caution-Warning:
Flue gas condensation is very aggressive and corrosive which could lead to failure of the venting system or drains, consult local and national codes
regarding flue gas condensation disposal. The P-trap assembly must be properly filled with water to avoid escape of flue gas emissions. The flue gas
condensation may require neutralization prior to entering the drain.
12 GT 300 A/II 06/10/06 - 94863873 - 85534150E

5.4 Boiler Venting – Side-wall or Direct Vent Systems Sizing Tables & Vent Safety Device
•All venting lengths must be calculated to equivalent lengths,
all application must include at least one 90° elbow
•Venting must be a type ‘BH” [AL294C® material]
•Maximum vent length [equivalent] = 30 ft. [9m]
•Minimum vent length [equivalent] 5 ft. [1.5m]
•Maximum number of 90° elbows = 2 or 3 45° elbows, each
90° elbow is equivalent to 10 ft. or straight pipe, the 45°
elbow is equivalent = 5 ft.
•Condensate TEE must be provided [equivalent length = 7 ft.]
•Appliance reducing adapter [equivalent length 3 ft.]
•Sealed combustion, combustion air intake sizing, must be
sized according to the burner manufacturers instructions
•Vent [breeching] pressure shall not exceed 0.20 inches w.c.
[0.50 mbar]
•Vent termination must be a TEE type, follow warning
regarding termination locations. Do not include the
termination TEE length in the vent length calculation.
•Venting shall be sloped, so any condensation developed will
drain through the condensate TEE fitting
•Vent safety device, differential air pressure switch [manual
reset] NC switch opens on rise of pressure.
•Optional function of power burners which can employ an
post purge function to exhaust flue gases for a fixed time [1
minute to 4 minutes maximum]
•Burner employing a standby air damper closed position, the
closed position should be slightly opened to allow hot flue
gases to escape upward through venting and not be
entrapped in the combustion head. Important note, that in
negative building pressures, the observation and odor of flue
gases may enter the boiler room.
Determining vent length [equivalent] Example:
Appliance reducing adapter [x1] = 3 ft.
Condensate TEE [x1] = 7 ft.
12” vent straight vent pipe [x3] = 3 ft.
Elbow 90° [x1] = 10 ft.
Termination TEE [x1] = 0 ft.
Length [equivalent] = 23 ft.
GTE 500 A Series
Model Boiler
Connection ø Oil-Gas Vent ø
[∆p] Pressure
switch Setting
[inches w.c.] Model Boiler
Connection ø Oil-Gas Vent ø
[∆p] Pressure
switch Setting
[inches w.c.]
GTE 515 A 16 inch 12 inch GTE 521 A 16 inch 12 inch
GTE 516 A 16 inch 12 inch GTE 522 A 18 inch 14 inch
GTE 517 A 16 inch 12 inch GTE 523 A 18 inch 14 inch
GTE 518 A 16 inch 12 inch GTE 524 A 18 inch 14 inch
GTE 519 A 16 inch 12 inch GTE 525 A 18 inch 14 inch
Set vent safety
pressure switch
150% above
burner gas
manifold or
head pressure
setting
GTE 520 A 16 inch 12 inch
Set vent safety
pressure switch
150% above
burner gas
manifold or
head pressure
setting
GT 300 A/II Series
Model Boiler
Connection ø Oil-Gas Vent ø [∆p] Pressure switch Setting [inches w.c.]
GT 304 A/II 7 inch 5 inch
GT 305 A/II 7 inch 5 inch
GT 306 A/II 7 inch 5 inch
GT 307 A/II 8 inch 6 inch
GT 308 A/II 8 inch 6 inch
GT 309 A/II 8 inch 6 inch
Set vent safety
pressure switch
150% above burner
gas manifold or
head pressure
setting
GT 400 A Series
Model Boiler Connection
ø
Oil-Gas
Vent ø
[∆p] Pressure
switch Setting
[inches w.c.]
GT 408 A 10 inch 8 inch
GT 409 A 10 inch 8 inch
GT 410 A 10 inch 8 inch
GT 411 A 12 inch 10 inch
GT 412 A 12 inch 10 inch
GT 413 A 12 inch 10 inch
GT 414 A 12 inch 10 inch
Set vent safety
pressure switch
150% above
burner gas
manifold or
head pressure
setting
13

A VENT SHALL NOT TERMINATE…..
Directly above a paved sidewalk or driveway which serves 2 buildings.
Less than 7 ft. any paved sidewalk or drive way
Less than 6 ft. of a combustion air inlet to any building
Less than 4 ft. above a meter/regulator assembly [horizontally] of the vertical center-line of the
regulator vent outlet to a maximum vertical distance of 15 ft.
Less than 4 ft. of any gas service regulator vent outlet
Less than 1 ft. above grade or normal anticipated snow level for the area
Less than 3 ft. from windows, doors [that can be opened], combustion air supply or any appliance
or building.
Underneath a veranda, porch or deck unless:
1. The veranda, porch or deck is fully open on a minimum of 2 sides beneath the floor
&
2. The distance between the top of the vent
termination and the underside of the veranda, porch or deck is greater than 1 ft.
B149.1
(GAS INSTALLATIONS CANADA)
5.5 All Side-wall and direct Vent termination locations installation precautions:
Warning/Caution:
In all cases avoid potential vent termination locations where excess debris or snow could accumulate and bock the
vent termination to any degree.
Minimum clearance of 4 ft. [1.22m] horizontally from, and in no case above or below, unless a 4 foot [1.22m]
horizontal distance is maintained, from electric meters, gas meters, regulators & relief equipment.
Do Not Co-Vent Any Direct Vent or Sidewall Venting System
WARNING-CAUTION
Consult Local Codes & Authorities for other Requirements not mentioned
A VENT SHALL NOT TERMINATE…..
Directly above a paved sidewalk or driveway which serves 2
buildings.
Less than 7 ft. any paved sidewalk or drive way
Less than 6 ft. from an open-able window, door or mechanical
combustion air supply
Less than 6 ft. of any combustion air inlet
Less than 3 ft. of the vertical centerline of the meter/regulator
assembly on a horizontal plane perpendicular to the regulator
Less than 6 ft. of gas service regulator vent outlet
Less than 4 ft. of oil tank vent or oil tank fill inlet
Less than 1 ft. above grade or normal anticipated snow level for the
area.
Within 6 ft. of a property line
Underneath a veranda, porch or deck
Flue gases are within 6 ft. of combustible material or any openings of
surrounding buildings.
Less than 3 ft. from an inside corner or L-shaped structure
Where flue gases may be directed towards brickwork, siding or other
construction that may cause damaged from heat or condensate from
the flue gases.
B139-00
(OIL INSTALLATIONS CANADA) A VENT SHALL NOT TERMINATE…..
ٛLess than 3 ft. of any combustion air inlet source located within 10 ft.
ٛLess than 1 ft. from any obstructions
ٛLess than 1 ft. above grade or normal anticipated snow level for the area.
ٛOver public walkways, driveways or other areas where condensate or
vapor could create nuisance or hazard or could be detrimental to the
operation of regulators, relief's, valves or other equipment
NFPA 54 / ANSI Z223
(GAS INSTALLATIONS USA)
A VENT SHALL NOT TERMINATE…..
ٛLess than 5 ft. from vent outlet of the supply tank
ٛLess than 7 ft. above walkways
ٛLess than 1 ft. from any door, window or air inlet source
ٛLess than 1 ft. from grade or snow level.
ٛLess than 3 ft. from a air intake that is within 10 ft
ٛLess than 1 ft. from soffit of the roof
ٛLess than 3 ft. from any building corner or L shape structure
NFPA 31
(OIL INSTALLATIONS USA)
14 GT 300 A/II 06/10/06 - 94863873 - 85534150E

6 Dimensional information required for connection of the boiler
A : chimney connection :
GT 304 A/II to GT 306 A/II : 7"ø
GT 307 A/II to GT 309 A/II : 8"ø
Oil or gas connections
1 Specific technical information supplied with the burner
• The boiler and its individual shutoff valve must be disconnected
fromthe gassupplypipingsystemduringany pressuretestingof
that system at test pressures in excess of 1/2 psi (3.5kPa),
• The boiler must be isolated from the gas supply piping system
by closing its individual manual shutoff valve during any
pressure testing of the gas supply piping system at test
pressures equal to or less than 1/2 psi (3.5 kPa),
• The boiler shall be installed such that the gas ignition system
components are protected from water (dripping, spraying, rain,
etc.) during appliance operation and service (circulator
replacement, condensate trap, control replacement, etc.),
• The boiler and its gas connection must be leak tested before
placing the boiler in operation,
• After placing the boiler in operation, the ignition system safety
shutoff device must be tested,
• Provision for vent, bleed and gas relief lines (when applicable),
• A sediment trap must be provided upstream of the gas controls,
• Location of manual main shutoff valve outside the jacket when
codes require.
53N14 A 85 0
32"9/16
15"
1/611
5"
/165
A
15
06/10/06 - 94863873 - 85534150E GT 300 A/II
The boiler must be connected to venting system
that will safely and effectively discharge all flue
gases to the outside in an effective manner.
Consult local and national codes regarding the
boiler breeching and chimney sizing.
Follow the information and documentation as supplied with
the burner, regarding:
The specific installation requirements, wiring, fuel supply and
piping and all adjustments of the air and fuel and start-up
procedure as be followed as supplied with the burner
documentation
Consult the burner manufacturer regarding the required
maintenance of the burner and the service intervals.
The entire heating system must be check once each heating
season.
Do not start the burner/boiler unless all access cover and
panels are in place.

Electrical
1 Wiring
Wiring in accordance with the requirements of the authority having
jurisdiction or, in the absence of such requirements, with the
Canadian Electrical Code Part 1, CSA C22.1, Electrical Codes.
2 Wiring procedure
De Dietrich boiler suggested field wiring procedure.
1: Top view
2: Boiler panel
3: Front
A: Race ways located under top panel of boiler
B: Wiring to be run in electrical race way to boiler control panel from
ancillaries
Main power to 4x4 junction box or enter rear of boiler through race
way.
C: 4x4 junction box location
D: Run BX cable between insulation and casing from boiler panel
E: Allow extra cable to swing burner open
1
2
3
A
B
C
D
E
16GT 300 A/II 06/10/06 - 94863873 - 85534150E
Warning/Caution:
Label all wiring prior to disconnection for servicing controls. Wiring
errors can cause improper and dangerous operation.
"Verify Proper Operation After Serving"

Wiring Legend
L – Main Line 120v
N – Main Neutral
N – Burner Neutral
L1 – Burner Line 120v
T1 – Boiler Limit
T2 – Burner Limit
T6 – Boiler Operating Limit
T7 – Burner Low Fire – As Required
T8 – Burner Hi Fire
S3 – Optional Burner Alarm
VA – Optional Hi Temp Alarm
A1-A2 – Optional Alarm Device
[Supplied by Others]
J1-J2 – Field Supplied jumpers
ALL ELECTRICAL CONNECTIONS
MAYBE FROM MULTIPLE SOURCES
Application Note for BMS or BAS systems:
The Local-Remote switch or enable/disable forced relay,
must interrupt the TCH2 control . TheTS & TCH1 limits
must remain in the limit circuit.
WARNING – CAUTION:
Panel Wiring Options:
On-Off Control [Single stage burners]
use jumper as shown
2 Stage Control [2 Stage burners]
Remove jumper 2 install firing rate control from burner
T6 – T8
Progressive Modulating Control
[Multi-Stage burners]
Remove jumpers 1
Installed burner limit circuit between T1 & T2
Remove jumper 2
Install burner firing rate control between T6 [common]
T7 [min rate] & T8 [max rate]
Consult burner manufacturer:
All burner wiring
Modulating Signal and required Controls
Burner Motor May require additional
power source
BMS Local-Remote Control Wiring.
Flexible Eutectic Sales Ltd. [De Dietrich North America] FA 122 Panel – Boiler Controller
12 11 10 9 8 7 6
VA S3 T8 T7 T6 T2 T1
1
63
N
120v 60Hz.
L1
5
N
4
TCH2 2
4
C
TCH1 2
1
C
TS 1
2
C
278912 411
A1
A2
Internal
L
Burner Power
L N
Limit CircuitFiring Rate Circuit
Burner Connections
J1J2
T1T2
T6 T7 T8
10 5
L
N
Vent Safety
Device Auxiliary Hi-
Limit [Optional] LWCO Service
Switch Fused Disconnect
Main fuse
disconnect
6A 120V max
Service Switch
[Others]
LWCO
Device
[As required]
Burner Safety
Interlock –
Optional [Others]
Wiring Symbols
Auxiliary limit –
Optional [Others]
120V Alarm
indicator [Others]
Factory Wiring
Field Wiring
[Others]
Strain Relief
[Others]
Alarm Wiring
[Others]
Jumper Wiring
[Others]
Vent Safety
Device [NC]
17
06/10/06 - 94863873 - 85534150E GT 300 A/II
Boiler Control Wiring

Electrical
1 Wiring
Wiring in accordance with the requirements of the authority having
jurisdiction or, in the absence of such requirements, with the
Canadian Electrical Code Part 1, CSA C22.1, Electrical Codes.
2 Wiring procedure
De Dietrich boiler suggested field wiring procedure.
1: Top view
2: Boiler panel
3: Front
A: Race ways located under top panel of boiler
B: Wiring to be run in electrical race way to boiler control panel from
ancillaries
Main power to 4x4 junction box or enter rear of boiler through race
way.
C: 4x4 junction box location
D: Run BX cable between insulation and casing from boiler panel
E: Allow extra cable to swing burner open
1
2
3
A
B
C
D
E
18GT 300 A/II 06/10/06 - 94863873 - 85534150E

FOR YOUR SAFETY READ BEFORE OPERATING
WARNING: If you do not follow these instructions exactly,
a fire or explosion may result causing properly damage,
personal injury or loss of life.
A. Thisappliancedoesnothaveapilot. Itisequippedwith anignition
device wich automatically lights the burner. Do not try to light the
burner by hand.
B. BEFORE OPERATING smell all around the appliance area for
gas. Be sure to smell next to the floor because some gas is heavier
than air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do not use any phone in your
building.
• Immediately call your gas supplier from a neighbor’s phone.
Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
C. Use only your hand to push in or turn the gas control knob. Never
usetools.Iftheknobwillnotpushinorturnbyhand,don’ttrytorepair
it: call a qualified service technician. Force or attempted repair may
result in a fire or explosion.
D. Do not use this appliance if any part has been under water.
Immediately call a qualified technician to inspect the appliance
and to replace any part of the control system and any gas control
which has been under water.
1 Start up procedures
• Inspect for proper baffling insertion into flue passes. All clean-
out doors properly sealed. Burner door closed and properly
latched.
• Gas and oil systems ready. Proper vent connections. Required
combustion and ventilation air provided.
• Waterside of system properly filled and vented of air.
• Lighting instruction followed.
• To be performed by a licensed tradesperson in accordance with
the guidelines shown in this manual. Follow burner
manufactures instructions.
• Mandatory factory start-up report to be completed and returned
to comply with the warranty process.
• Proper operating instructions of equipment to be related to
operating personnel.
2 Shut-down procedures
• Disengage all electrical power switches to heating system
burners, pumps. Isolate all boiler valves and fuel valves.
• Foroff-seasonshutdown,open boiler combustionflue ways and
clean. Ensure venting, chimney, combustion and ventilation air
openings free from blockage. Do not drain waterside of system.
- Shutoff fuel supply lines
17

Maintenance
1 Boiler
It is not advisable to drain an installation, except in case of
absolute necessity. Check the water level of the installation and
top it off if necessary, avoiding a sudden inlet of cold water in the
hot boiler.
Check for system leaks.
Professional water treatment is recommended.
The good performance of the boiler depends on cleanliness.
Cleaning the boiler must be carried out as often as required and at
least,asfortheflueonceayear.Thefollowing operationsarealways
carried out with the boiler and the power supply shut off.
• Cleaning of the flue gas circuit :
- switch off the electricity supply to the boiler
- unhook the front cover
20 GT 300 A/II 06/10/06 - 94863873 - 85534150E
Ensure all access cover and doors are in place prior to
starting the boiler-burner.